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August 12, 2013, 11:16 
Unstabil Simulation with chtMultiRegionFoam

#1 
New Member
M Bay
Join Date: Jun 2013
Location: Germany
Posts: 10
Rep Power: 5 
Hi everybody,
I m having a hard Time to find the Problem that make OpenFOAM stop simulating my konvektion with chtMultiRegionFoam. It seems that the Problem have something with calcutating h in the Air. That makes my Simulation unstabil. // * * * * * * * * * * * * * Code:
* * * * * * * * * * * * * * * * * * * * * * * * // Create time Create fluid mesh for region bottomAir for time = 0 Create solid mesh for region KK for time = 0 *** Reading fluid mesh thermophysical properties for region bottomAir Adding to thermoFluid Selecting thermodynamics package { type heRhoThermo; mixture pureMixture; transport const; thermo hConst; equationOfState perfectGas; specie specie; energy sensibleEnthalpy; } Adding to rhoFluid Adding to UFluid Adding to phiFluid Adding to gFluid Adding to turbulence Selecting turbulence model type laminar Adding to ghFluid Adding to ghfFluid Radiation model not active: radiationProperties not found Selecting radiationModel none Adding fvOptions No finite volume options present *** Reading solid mesh thermophysical properties for region KK Adding to thermos Selecting thermodynamics package { type heSolidThermo; mixture pureMixture; transport constIso; thermo hConst; equationOfState rhoConst; specie specie; energy sensibleEnthalpy; } Adding to radiations Selecting radiationModel opaqueSolid Selecting absorptionEmissionModel constantAbsorptionEmission Selecting scatterModel none Adding fvOptions No finite volume options present Time = 1 Solving for fluid region bottomAir DILUPBiCG: Solving for Ux, Initial residual = 1, Final residual = 0.0244138, No Iterations 2 DILUPBiCG: Solving for Uy, Initial residual = 1, Final residual = 0.0235651, No Iterations 2 DILUPBiCG: Solving for Uz, Initial residual = 1, Final residual = 0.0249624, No Iterations 2 DILUPBiCG: Solving for h, Initial residual = 1, Final residual = 0.016444, No Iterations 3 Min/max T:292.987 300.021 GAMG: Solving for p_rgh, Initial residual = 0.804056, Final residual = 0.00263329, No Iterations 6 time step continuity errors : sum local = 0.0540164, global = 5.78109e19, cumulative = 5.78109e19 Min/max rho:1.15854 1.18635 Solving for solid region KK DICPCG: Solving for h, Initial residual = 1, Final residual = 0.0205534, No Iterations 2 Min/max T:min(T) [0 0 0 1 0 0 0] 296.988 max(T) [0 0 0 1 0 0 0] 360 ExecutionTime = 1.69 s ClockTime = 1 s Time = 2 Solving for fluid region bottomAir DILUPBiCG: Solving for Ux, Initial residual = 0.489481, Final residual = 0.0177715, No Iterations 2 DILUPBiCG: Solving for Uy, Initial residual = 0.215961, Final residual = 0.0114513, No Iterations 2 DILUPBiCG: Solving for Uz, Initial residual = 0.492604, Final residual = 0.0180205, No Iterations 2 DILUPBiCG: Solving for h, Initial residual = 0.407711, Final residual = 0.0253633, No Iterations 2 Min/max T:293.299 307.626 GAMG: Solving for p_rgh, Initial residual = 0.970476, Final residual = 0.00912021, No Iterations 6 time step continuity errors : sum local = 0.0476966, global = 7.11662e18, cumulative = 6.53851e18 Min/max rho:1.12815 1.19433 Solving for solid region KK DICPCG: Solving for h, Initial residual = 0.209485, Final residual = 0.00386612, No Iterations 2 Min/max T:min(T) [0 0 0 1 0 0 0] 296.952 max(T) [0 0 0 1 0 0 0] 360 ExecutionTime = 2.25 s ClockTime = 2 s Time = 3 Solving for fluid region bottomAir DILUPBiCG: Solving for Ux, Initial residual = 0.45139, Final residual = 0.0328024, No Iterations 2 DILUPBiCG: Solving for Uy, Initial residual = 0.55513, Final residual = 0.0539866, No Iterations 2 DILUPBiCG: Solving for Uz, Initial residual = 0.454886, Final residual = 0.0282488, No Iterations 3 DILUPBiCG: Solving for h, Initial residual = 0.509759, Final residual = 0.0246587, No Iterations 2 Min/max T:31.9756 316.071 GAMG: Solving for p_rgh, Initial residual = 0.723399, Final residual = 0.00572431, No Iterations 5 time step continuity errors : sum local = 0.0547409, global = 3.87611e18, cumulative = 2.6624e18 Min/max rho:0.841215 2 Solving for solid region KK DICPCG: Solving for h, Initial residual = 0.109023, Final residual = 0.00190129, No Iterations 2 Min/max T:min(T) [0 0 0 1 0 0 0] 296.805 max(T) [0 0 0 1 0 0 0] 360 ExecutionTime = 2.84 s ClockTime = 3 s Time = 4 Solving for fluid region bottomAir DILUPBiCG: Solving for Ux, Initial residual = 0.415676, Final residual = 0.00778006, No Iterations 3 DILUPBiCG: Solving for Uy, Initial residual = 0.697505, Final residual = 0.0673045, No Iterations 2 DILUPBiCG: Solving for Uz, Initial residual = 0.414124, Final residual = 0.0344727, No Iterations 2 DILUPBiCG: Solving for h, Initial residual = 0.628609, Final residual = 0.00417972, No Iterations 4 Min/max T:17.0031 363.37 GAMG: Solving for p_rgh, Initial residual = 0.767669, Final residual = 0.00549893, No Iterations 5 time step continuity errors : sum local = 0.108476, global = 7.559e18, cumulative = 4.8966e18 Min/max rho:0.53968 2 Solving for solid region KK DICPCG: Solving for h, Initial residual = 0.0721226, Final residual = 0.0012664, No Iterations 2 Min/max T:min(T) [0 0 0 1 0 0 0] 296.17 max(T) [0 0 0 1 0 0 0] 360 ExecutionTime = 3.41 s ClockTime = 3 s Time = 5 Solving for fluid region bottomAir DILUPBiCG: Solving for Ux, Initial residual = 0.34231, Final residual = 0.0171793, No Iterations 2 DILUPBiCG: Solving for Uy, Initial residual = 0.491816, Final residual = 0.0140244, No Iterations 3 DILUPBiCG: Solving for Uz, Initial residual = 0.355791, Final residual = 0.0160844, No Iterations 2 DILUPBiCG: Solving for h, Initial residual = 0.463123, Final residual = 0.0248464, No Iterations 2 Min/max T:148.512 347.184 GAMG: Solving for p_rgh, Initial residual = 0.766683, Final residual = 0.00230729, No Iterations 6 time step continuity errors : sum local = 0.0375931, global = 7.12003e18, cumulative = 1.20166e17 Min/max rho:0.944051 2 Solving for solid region KK DICPCG: Solving for h, Initial residual = 0.0531948, Final residual = 0.0009174, No Iterations 2 Min/max T:min(T) [0 0 0 1 0 0 0] 296.29 max(T) [0 0 0 1 0 0 0] 360 ExecutionTime = 4.05 s ClockTime = 4 s Time = 6 Solving for fluid region bottomAir DILUPBiCG: Solving for Ux, Initial residual = 0.407268, Final residual = 0.0273037, No Iterations 2 DILUPBiCG: Solving for Uy, Initial residual = 0.43275, Final residual = 0.0111889, No Iterations 3 DILUPBiCG: Solving for Uz, Initial residual = 0.415631, Final residual = 0.00593571, No Iterations 3 DILUPBiCG: Solving for h, Initial residual = 0.456496, Final residual = 0.0253663, No Iterations 2 Min/max T:212.035 335.633 GAMG: Solving for p_rgh, Initial residual = 0.744447, Final residual = 0.00689067, No Iterations 5 time step continuity errors : sum local = 0.0813514, global = 3.91602e18, cumulative = 8.10061e18 Min/max rho:0.983594 1.88713 Solving for solid region KK DICPCG: Solving for h, Initial residual = 0.0419207, Final residual = 0.000700995, No Iterations 2 Min/max T:min(T) [0 0 0 1 0 0 0] 296.455 max(T) [0 0 0 1 0 0 0] 360 ExecutionTime = 4.65 s ClockTime = 4 s Time = 7 Solving for fluid region bottomAir DILUPBiCG: Solving for Ux, Initial residual = 0.387934, Final residual = 0.0327896, No Iterations 2 DILUPBiCG: Solving for Uy, Initial residual = 0.490351, Final residual = 0.0114847, No Iterations 3 DILUPBiCG: Solving for Uz, Initial residual = 0.389361, Final residual = 0.0226725, No Iterations 2 DILUPBiCG: Solving for h, Initial residual = 0.398425, Final residual = 0.00950898, No Iterations 3 Min/max T:119.731 329.884 GAMG: Solving for p_rgh, Initial residual = 0.726224, Final residual = 0.00385633, No Iterations 5 time step continuity errors : sum local = 0.0571994, global = 8.78886e18, cumulative = 6.88244e19 Min/max rho:0.587975 2 Solving for solid region KK DICPCG: Solving for h, Initial residual = 0.0344731, Final residual = 0.000555654, No Iterations 2 Min/max T:min(T) [0 0 0 1 0 0 0] 296.613 max(T) [0 0 0 1 0 0 0] 360 ExecutionTime = 5.24 s ClockTime = 5 s Time = 8 Solving for fluid region bottomAir DILUPBiCG: Solving for Ux, Initial residual = 0.28233, Final residual = 0.00608968, No Iterations 3 DILUPBiCG: Solving for Uy, Initial residual = 0.332424, Final residual = 0.0148631, No Iterations 3 DILUPBiCG: Solving for Uz, Initial residual = 0.293554, Final residual = 0.0232985, No Iterations 2 DILUPBiCG: Solving for h, Initial residual = 0.336824, Final residual = 0.0129785, No Iterations 3 Min/max T:179.143 331.62 GAMG: Solving for p_rgh, Initial residual = 0.747343, Final residual = 0.00702316, No Iterations 5 time step continuity errors : sum local = 0.112819, global = 2.7136e18, cumulative = 3.40184e18 Min/max rho:0.913078 2 Solving for solid region KK DICPCG: Solving for h, Initial residual = 0.0292409, Final residual = 0.000453907, No Iterations 2 Min/max T:min(T) [0 0 0 1 0 0 0] 296.653 max(T) [0 0 0 1 0 0 0] 360 ExecutionTime = 5.87 s ClockTime = 6 s Time = 9 Solving for fluid region bottomAir DILUPBiCG: Solving for Ux, Initial residual = 0.307796, Final residual = 0.0252584, No Iterations 2 DILUPBiCG: Solving for Uy, Initial residual = 0.200522, Final residual = 0.00505223, No Iterations 3 DILUPBiCG: Solving for Uz, Initial residual = 0.324858, Final residual = 0.0291988, No Iterations 2 DILUPBiCG: Solving for h, Initial residual = 0.380318, Final residual = 0.0079069, No Iterations 3 Min/max T:250.067 333.011 GAMG: Solving for p_rgh, Initial residual = 0.704899, Final residual = 0.00422722, No Iterations 5 time step continuity errors : sum local = 0.0450128, global = 9.44612e18, cumulative = 1.2848e17 Min/max rho:0.993519 1.40521 Solving for solid region KK DICPCG: Solving for h, Initial residual = 0.0253593, Final residual = 0.000378493, No Iterations 2 Min/max T:min(T) [0 0 0 1 0 0 0] 296.511 max(T) [0 0 0 1 0 0 0] 360 ExecutionTime = 6.44 s ClockTime = 6 s Time = 10 Solving for fluid region bottomAir DILUPBiCG: Solving for Ux, Initial residual = 0.341598, Final residual = 0.0160249, No Iterations 3 DILUPBiCG: Solving for Uy, Initial residual = 0.440415, Final residual = 0.0410832, No Iterations 2 DILUPBiCG: Solving for Uz, Initial residual = 0.348379, Final residual = 0.0247462, No Iterations 2 DILUPBiCG: Solving for h, Initial residual = 0.31586, Final residual = 0.0288227, No Iterations 2 Min/max T:133.182 334.105 GAMG: Solving for p_rgh, Initial residual = 0.678469, Final residual = 0.00227451, No Iterations 5 time step continuity errors : sum local = 0.0222442, global = 4.5616e19, cumulative = 1.23918e17 Min/max rho:0.509166 1.66624 Solving for solid region KK DICPCG: Solving for h, Initial residual = 0.0224042, Final residual = 0.000321794, No Iterations 2 Min/max T:min(T) [0 0 0 1 0 0 0] 296.18 max(T) [0 0 0 1 0 0 0] 360 ExecutionTime = 7.02 s ClockTime = 7 s Time = 11 Solving for fluid region bottomAir DILUPBiCG: Solving for Ux, Initial residual = 0.290416, Final residual = 0.0158395, No Iterations 3 DILUPBiCG: Solving for Uy, Initial residual = 0.394223, Final residual = 0.036334, No Iterations 2 DILUPBiCG: Solving for Uz, Initial residual = 0.29554, Final residual = 0.0250645, No Iterations 2 DILUPBiCG: Solving for h, Initial residual = 0.27665, Final residual = 0.0269377, No Iterations 2 Min/max T:184.884 334.996 GAMG: Solving for p_rgh, Initial residual = 0.719697, Final residual = 0.00671242, No Iterations 5 time step continuity errors : sum local = 0.0882205, global = 4.84435e18, cumulative = 7.54745e18 Min/max rho:0.828506 2 Solving for solid region KK DICPCG: Solving for h, Initial residual = 0.0200846, Final residual = 0.000278391, No Iterations 2 Min/max T:min(T) [0 0 0 1 0 0 0] 295.961 max(T) [0 0 0 1 0 0 0] 360 ExecutionTime = 7.59 s ClockTime = 7 s Time = 12 Solving for fluid region bottomAir DILUPBiCG: Solving for Ux, Initial residual = 0.273298, Final residual = 0.0219519, No Iterations 2 DILUPBiCG: Solving for Uy, Initial residual = 0.221847, Final residual = 0.0197972, No Iterations 2 DILUPBiCG: Solving for Uz, Initial residual = 0.288302, Final residual = 0.0204731, No Iterations 2 DILUPBiCG: Solving for h, Initial residual = 0.337786, Final residual = 0.0197126, No Iterations 2 Min/max T:245.752 335.745 GAMG: Solving for p_rgh, Initial residual = 0.690738, Final residual = 0.00637376, No Iterations 5 time step continuity errors : sum local = 0.0617498, global = 1.7233e18, cumulative = 5.82415e18 Min/max rho:1.03632 1.44389 Solving for solid region KK DICPCG: Solving for h, Initial residual = 0.0181846, Final residual = 0.000242582, No Iterations 2 Min/max T:min(T) [0 0 0 1 0 0 0] 295.826 max(T) [0 0 0 1 0 0 0] 360 ExecutionTime = 8.16 s ClockTime = 8 s Time = 13 Solving for fluid region bottomAir DILUPBiCG: Solving for Ux, Initial residual = 0.302581, Final residual = 0.00585637, No Iterations 4 DILUPBiCG: Solving for Uy, Initial residual = 0.386143, Final residual = 0.0377692, No Iterations 2 DILUPBiCG: Solving for Uz, Initial residual = 0.30196, Final residual = 0.0255285, No Iterations 2 DILUPBiCG: Solving for h, Initial residual = 0.278727, Final residual = 0.025618, No Iterations 2 Min/max T:245.646 1301.59 GAMG: Solving for p_rgh, Initial residual = 0.653636, Final residual = 0.00617912, No Iterations 4 time step continuity errors : sum local = 0.0538323, global = 1.3988e18, cumulative = 7.22295e18 Min/max rho:0.262126 1.63589 Solving for solid region KK DICPCG: Solving for h, Initial residual = 0.0171027, Final residual = 0.000284466, No Iterations 2 Min/max T:min(T) [0 0 0 1 0 0 0] 295.769 max(T) [0 0 0 1 0 0 0] 360 ExecutionTime = 8.75 s ClockTime = 9 s Time = 14 Solving for fluid region bottomAir DILUPBiCG: Solving for Ux, Initial residual = 0.27036, Final residual = 0.0223134, No Iterations 2 DILUPBiCG: Solving for Uy, Initial residual = 0.321986, Final residual = 0.00629441, No Iterations 3 DILUPBiCG: Solving for Uz, Initial residual = 0.264422, Final residual = 0.00736481, No Iterations 3 DILUPBiCG: Solving for h, Initial residual = 0.283332, Final residual = 0.0224435, No Iterations 2 Min/max T:225.238 859.95 GAMG: Solving for p_rgh, Initial residual = 0.669059, Final residual = 0.00379205, No Iterations 6 time step continuity errors : sum local = 0.0360521, global = 4.18486e19, cumulative = 7.64144e18 Min/max rho:0.414664 1.80028 Solving for solid region KK DICPCG: Solving for h, Initial residual = 0.016315, Final residual = 0.000276046, No Iterations 2 Min/max T:min(T) [0 0 0 1 0 0 0] 295.743 max(T) [0 0 0 1 0 0 0] 360 ExecutionTime = 9.35 s ClockTime = 9 s Time = 15 Solving for fluid region bottomAir DILUPBiCG: Solving for Ux, Initial residual = 0.214962, Final residual = 0.0152287, No Iterations 2 DILUPBiCG: Solving for Uy, Initial residual = 0.122978, Final residual = 0.0105771, No Iterations 2 DILUPBiCG: Solving for Uz, Initial residual = 0.231511, Final residual = 0.015678, No Iterations 3 DILUPBiCG: Solving for h, Initial residual = 0.239068, Final residual = 0.00535052, No Iterations 3 Min/max T:268.77 679.817 GAMG: Solving for p_rgh, Initial residual = 0.639297, Final residual = 0.00194893, No Iterations 6 time step continuity errors : sum local = 0.020783, global = 2.40931e18, cumulative = 1.00508e17 Min/max rho:0.727268 1.84172 Solving for solid region KK DICPCG: Solving for h, Initial residual = 0.016017, Final residual = 0.000270371, No Iterations 2 Min/max T:min(T) [0 0 0 1 0 0 0] 295.693 max(T) [0 0 0 1 0 0 0] 360 ExecutionTime = 9.96 s ClockTime = 10 s Time = 16 Solving for fluid region bottomAir DILUPBiCG: Solving for Ux, Initial residual = 0.220373, Final residual = 0.00644444, No Iterations 3 DILUPBiCG: Solving for Uy, Initial residual = 0.234987, Final residual = 0.0229902, No Iterations 2 DILUPBiCG: Solving for Uz, Initial residual = 0.231552, Final residual = 0.0109475, No Iterations 3 DILUPBiCG: Solving for h, Initial residual = 0.179052, Final residual = 0.00462697, No Iterations 3 Min/max T:280.286 597.52 GAMG: Solving for p_rgh, Initial residual = 0.610836, Final residual = 0.00289421, No Iterations 5 time step continuity errors : sum local = 0.0171758, global = 5.11318e18, cumulative = 1.51639e17 Min/max rho:0.319603 1.48612 Solving for solid region KK DICPCG: Solving for h, Initial residual = 0.0153671, Final residual = 0.000239808, No Iterations 2 Min/max T:min(T) [0 0 0 1 0 0 0] 295.691 max(T) [0 0 0 1 0 0 0] 360 ExecutionTime = 10.58 s ClockTime = 10 s Time = 17 Solving for fluid region bottomAir DILUPBiCG: Solving for Ux, Initial residual = 0.26343, Final residual = 0.0217329, No Iterations 2 DILUPBiCG: Solving for Uy, Initial residual = 0.356318, Final residual = 0.0308314, No Iterations 2 DILUPBiCG: Solving for Uz, Initial residual = 0.280643, Final residual = 0.0263077, No Iterations 2 DILUPBiCG: Solving for h, Initial residual = 0.158732, Final residual = 0.00587434, No Iterations 3 Min/max T:542.333 553.177 GAMG: Solving for p_rgh, Initial residual = 0.647338, Final residual = 0.00512559, No Iterations 6 time step continuity errors : sum local = 0.0307202, global = 1.32267e18, cumulative = 1.64866e17 Min/max rho:0.2 2 Solving for solid region KK DICPCG: Solving for h, Initial residual = 0.0146789, Final residual = 0.00022046, No Iterations 2 Min/max T:min(T) [0 0 0 1 0 0 0] 295.707 max(T) [0 0 0 1 0 0 0] 360 ExecutionTime = 11.2 s ClockTime = 11 s Time = 18 Solving for fluid region bottomAir DILUPBiCG: Solving for Ux, Initial residual = 0.209893, Final residual = 0.00490878, No Iterations 3 DILUPBiCG: Solving for Uy, Initial residual = 0.153147, Final residual = 0.0036681, No Iterations 3 DILUPBiCG: Solving for Uz, Initial residual = 0.241414, Final residual = 0.00634049, No Iterations 3 DILUPBiCG: Solving for h, Initial residual = 0.220824, Final residual = 0.00727578, No Iterations 3 > FOAM FATAL ERROR: Maximum number of iterations exceeded From function thermo<Thermo, Type>::T(scalar f, scalar T0, scalar (thermo<Thermo, Type>::*F)(const scalar) const, scalar (thermo<Thermo, Type>::*dFdT)(const scalar) const, scalar (thermo<Thermo, Type>::*limit)(const scalar) const) const in file /usr2/sw/OpenFOAM//OpenFOAM2.2.0/src/thermophysicalModels/specie/lnInclude/thermoI.H at line 76. FOAM aborting #0 Foam::error::printStack(Foam::Ostream&) in "/cax/sw/OPENFOAM/LINUX_x86_64/OpenFOAM2.2.0/platforms/linux64GccDPOpt/lib/libOpenFOAM.so" #1 Foam::error::abort() in "/cax/sw/OPENFOAM/LINUX_x86_64/OpenFOAM2.2.0/platforms/linux64GccDPOpt/lib/libOpenFOAM.so" #2 Foam::species::thermo<Foam::hConstThermo<Foam::perfectGas<Foam::specie> >, Foam::sensibleEnthalpy>::T(double, double, double, double (Foam::species::thermo<Foam::hConstThermo<Foam::perfectGas<Foam::specie> >, Foam::sensibleEnthalpy>::*)(double, double) const, double (Foam::species::thermo<Foam::hConstThermo<Foam::perfectGas<Foam::specie> >, Foam::sensibleEnthalpy>::*)(double, double) const, double (Foam::species::thermo<Foam::hConstThermo<Foam::perfectGas<Foam::specie> >, Foam::sensibleEnthalpy>::*)(double) const) const in "/cax/sw/OPENFOAM/LINUX_x86_64/OpenFOAM2.2.0/platforms/linux64GccDPOpt/lib/libfluidThermophysicalModels.so" #3 Foam::heRhoThermo<Foam::rhoThermo, Foam::pureMixture<Foam::constTransport<Foam::species::thermo<Foam::hConstThermo<Foam::perfectGas<Foam::specie> >, Foam::sensibleEnthalpy> > > >::calculate() in "/cax/sw/OPENFOAM/LINUX_x86_64/OpenFOAM2.2.0/platforms/linux64GccDPOpt/lib/libfluidThermophysicalModels.so" #4 Foam::heRhoThermo<Foam::rhoThermo, Foam::pureMixture<Foam::constTransport<Foam::species::thermo<Foam::hConstThermo<Foam::perfectGas<Foam::specie> >, Foam::sensibleEnthalpy> > > >::correct() in "/cax/sw/OPENFOAM/LINUX_x86_64/OpenFOAM2.2.0/platforms/linux64GccDPOpt/lib/libfluidThermophysicalModels.so" #5 in "/cax/sw/OPENFOAM/LINUX_x86_64/OpenFOAM2.2.0/platforms/linux64GccDPOpt/bin/chtMultiRegionSimpleFoam" #6 __libc_start_main in "/lib64/libc.so.6" #7 in "/cax/sw/OPENFOAM/LINUX_x86_64/OpenFOAM2.2.0/platforms/linux64GccDPOpt/bin/chtMultiRegionSimpleFoam" Regards Last edited by wyldckat; August 17, 2013 at 08:17. Reason: Added [CODE][/CODE] 

August 25, 2013, 07:40 

#2  
Super Moderator
Bruno Santos
Join Date: Mar 2009
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Greetings mbay101,
I noticed that you've asked a related question here: http://www.cfdonline.com/Forums/ope...tml#post443898 post #27 OK, there isn't much information to work with here. The only thing I'm able to see is that your temperature ranges are all over the place  just look at the last few iterations: Quote:
Please provide more information about your case, as explained here: http://www.cfdonline.com/Forums/ope...gethelp.html Best regards, Bruno
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August 26, 2013, 03:07 

#3 
New Member
M Bay
Join Date: Jun 2013
Location: Germany
Posts: 10
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Hi wyldckat,
thank you for offering your Help. I solve the Problem but im not satisfied with my solution and to be frank with you I don t quite understand it . After I saw that my solution is very unstabil, I started to change variable in my case and I had succes when i increase the value of mu in thermophsicalProperties. The Problem is that I m trying to simulate the Air and when i use 1,87e01 insteed of 1,87e05 that change the velocity of the Air in my Geometrie Re = L.w/nu with nu is kinematic viscosity. Do you have any idea why is my case working only with high kinematic viscosity. Best regards, 

August 26, 2013, 03:21 

#4 
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M Bay
Join Date: Jun 2013
Location: Germany
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By the way,
sorry if i didn t follow http://www.cfdonline.com/Forums/ope...gethelp.html to explain my problem. This Problem is not case relevant. I always get the same problem with diffrent cases. I made a case to describe the situation. Here I tried to simulate a worm Solid in Air (free Konvektion) laminar flow. I mesh my geometry with salome and checkMesh look very good and i never got i problem with the Mesh. I use chtMultiRegionSimpleFoam and i took the system Files from the tutorial (fvScheme, fvSolution and controlDic) I tried to simulate the cases with laminar or turbulent kEpsilon Modell. both ways i needed to increase the viscosity nu to get the case working. how dose that effect my air velocity? or anything else in my case. thank you for any help 

August 26, 2013, 04:40 

#5 
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M Bay
Join Date: Jun 2013
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Sorry I forgot the case!!
OUT is the Air boundary for the limit of the Region. I can use also wall, but it dosen t seems that big of a diffrence between empty and wall with fixedValue (0 0 0) in U. Thank you again. 

August 26, 2013, 18:03 

#6 
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Bruno Santos
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Hi mbay101,
Well, if you increase the viscosity 1000x, then it acts more like a heavy liquid or like honey or something like that, which turns the flow into something very laminar and with a good+nice heat flow. Given that your case seems to be only one solid and one fluid region, I suggest that you try to work based on this simplified multiregion case (has two fluid regions and one solid): http://openfoamwiki.net/index.php/Ge...__planeWall2D The suggestion is to:
Best regards, Bruno
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August 27, 2013, 02:10 

#7 
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M Bay
Join Date: Jun 2013
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Hi Bruno,
thank you for replying. I will try your Suggestion. Another question: I always bring my Source Heat in the system by giving a fixedValue Temprature on a surface. I would Like to insert now a Heat Flux. can you show me how the Code looks like in OpenFOAM 2.2.0? Inlet_HeatFlux { type compressible::turbulentHeatFluxTemperature; heatSource flux; q uniform 17; kappa solidThermo; kappaName none; value uniform 297; } but this way i can t see any Temperature getting in my System what m i missing here? 

August 27, 2013, 17:28 

#8 
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Bruno Santos
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Quick answer: I think what you are looking for is this: http://foam.sourceforge.net/docs/cpp...8.html#details
I found it through the modules section, under the "Wall boundary Conditions" subsection: http://www.openfoam.org/version2.2.0/documentation.php
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December 3, 2013, 04:47 
A similar error.. I think

#9 
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Srivathsan N
Join Date: Jan 2013
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Rep Power: 6 
Hi Bruno,
I also have a "Foam::error:rintStack(Foam::Ostream&)" error appearing when I run my case. However I'm not able to run even one time step. I have a modified heatTransfer solver that uses a user_defined BC for two of the four boundaries in the geometry. blockMesh compiles well. I am running a laminar case and so I've turned turbulence off in the RASproperties. However I get the following when I execute the solver. Code:
Create time Create mesh for time = 0 Reading g Reading thermophysical properties Reading field T Reading field p_rgh Reading field U Reading/calculating face flux field phi Selecting incompressible transport model Newtonian Creating turbulence model Selecting RAS turbulence model laminar Reading field alphat Calculating field g.h No finite volume options present SIMPLE: convergence criteria field p_rgh tolerance 0.01 field U tolerance 0.0001 field T tolerance 0.01 field "(kepsilonomega)" tolerance 0.001 Starting time loop Time = 1e05 #0 Foam::error::printStack(Foam::Ostream&) in "/opt/openfoam222/platforms/linuxGccDPOpt/lib/libOpenFOAM.so" #1 Foam::sigSegv::sigHandler(int) in "/opt/openfoam222/platforms/linuxGccDPOpt/lib/libOpenFOAM.so" #2 Uninterpreted: #3 Foam::fv::gaussGrad<Foam::Vector<double> >::correctBoundaryConditions(Foam::GeometricField<Foam::Vector<double>, Foam::fvPatchField, Foam::volMesh> const&, Foam::GeometricField<Foam::Tensor<double>, Foam::fvPatchField, Foam::volMesh>&) in "/opt/openfoam222/platforms/linuxGccDPOpt/lib/libfiniteVolume.so" #4 Foam::fv::gaussGrad<Foam::Vector<double> >::calcGrad(Foam::GeometricField<Foam::Vector<double>, Foam::fvPatchField, Foam::volMesh> const&, Foam::word const&) const in "/opt/openfoam222/platforms/linuxGccDPOpt/lib/libfiniteVolume.so" #5 Foam::fv::gradScheme<Foam::Vector<double> >::grad(Foam::GeometricField<Foam::Vector<double>, Foam::fvPatchField, Foam::volMesh> const&, Foam::word const&) const in "/opt/openfoam222/platforms/linuxGccDPOpt/lib/libfiniteVolume.so" #6 Foam::tmp<Foam::GeometricField<Foam::outerProduct<Foam::Vector<double>, Foam::Vector<double> >::type, Foam::fvPatchField, Foam::volMesh> > Foam::fvc::grad<Foam::Vector<double> >(Foam::GeometricField<Foam::Vector<double>, Foam::fvPatchField, Foam::volMesh> const&) in "/opt/openfoam222/platforms/linuxGccDPOpt/lib/libfiniteVolume.so" #7 Foam::incompressible::RASModels::laminar::divDevReff(Foam::GeometricField<Foam::Vector<double>, Foam::fvPatchField, Foam::volMesh>&) const in "/opt/openfoam222/platforms/linuxGccDPOpt/lib/libincompressibleRASModels.so" #8 in "/home/srivathsan/OpenFOAM/srivathsan2.2.2/platforms/linuxGccDPOpt/bin/buoyantBoussinesqSimpleFoamTemp" #9 __libc_start_main in "/lib/i386linuxgnu/libc.so.6" #10 in "/home/srivathsan/OpenFOAM/srivathsan2.2.2/platforms/linuxGccDPOpt/bin/buoyantBoussinesqSimpleFoamTemp" 2. How do i rectify it? 3. What does the line #0 mean in the error?
__________________
Regards, Srivaths 

December 5, 2013, 00:31 

#10 
Senior Member
Srivathsan N
Join Date: Jan 2013
Location: India
Posts: 101
Rep Power: 6 
I am able to see that the the solver is not able to access libfiniteVolume.so and libincompressibleRASModels.so for some reason there by not being able to use fvSchemes properly.
Otherwise, I'm not able to make any headway with the above error. Any idea anyone?
__________________
Regards, Srivaths Last edited by Sherlock_1812; December 6, 2013 at 02:07. 

December 8, 2013, 10:36 

#11 
Super Moderator
Bruno Santos
Join Date: Mar 2009
Location: Lisbon, Portugal
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Hi Srivaths,
The stack trace is that last part of the output you're seeing, which starts with the #0, down to whichever is the last # number. It gives you a trace of the subroutine call history, which lead to the current crash. The history is in reverse, namely, the first event was #10 and crashed somewhere near #0. So, if we look from #0 to #10, here's what they mean: Code:
#0 Foam::error::printStack(Foam::Ostream&) in "/opt/openfoam222/platforms/linuxGccDPOpt/lib/libOpenFOAM.so" Code:
#1 Foam::sigSegv::sigHandler(int) in "/opt/openfoam222/platforms/linuxGccDPOpt/lib/libOpenFOAM.so" This is the reason why printStack was called. Code:
#2 Uninterpreted: Code:
#3 Foam::fv::gaussGrad<Foam::Vector<double> >::correctBoundaryConditions(Foam::GeometricField<Foam::Vector<double>, Foam::fvPatchField, Foam::volMesh> const&, Foam::GeometricField<Foam::Tensor<double>, Foam::fvPatchField, Foam::volMesh>&) in "/opt/openfoam222/platforms/linuxGccDPOpt/lib/libfiniteVolume.so" This one "corrects boundary conditions", which is why it's called correctBoundaryConditions Code:
#4 Foam::fv::gaussGrad<Foam::Vector<double> >::calcGrad(Foam::GeometricField<Foam::Vector<double>, Foam::fvPatchField, Foam::volMesh> const&, Foam::word const&) const in "/opt/openfoam222/platforms/linuxGccDPOpt/lib/libfiniteVolume.so" Code:
#5 Foam::fv::gradScheme<Foam::Vector<double> >::grad(Foam::GeometricField<Foam::Vector<double>, Foam::fvPatchField, Foam::volMesh> const&, Foam::word const&) const in "/opt/openfoam222/platforms/linuxGccDPOpt/lib/libfiniteVolume.so" Code:
#6 Foam::tmp<Foam::GeometricField<Foam::outerProduct<Foam::Vector<double>, Foam::Vector<double> >::type, Foam::fvPatchField, Foam::volMesh> > Foam::fvc::grad<Foam::Vector<double> >(Foam::GeometricField<Foam::Vector<double>, Foam::fvPatchField, Foam::volMesh> const&) in "/opt/openfoam222/platforms/linuxGccDPOpt/lib/libfiniteVolume.so" Code:
#7 Foam::incompressible::RASModels::laminar::divDevReff(Foam::GeometricField<Foam::Vector<double>, Foam::fvPatchField, Foam::volMesh>&) const in "/opt/openfoam222/platforms/linuxGccDPOpt/lib/libincompressibleRASModels.so"
Code:
#8 in "/home/srivathsan/OpenFOAM/srivathsan2.2.2/platforms/linuxGccDPOpt/bin/buoyantBoussinesqSimpleFoamTemp" Code:
#9 __libc_start_main in "/lib/i386linuxgnu/libc.so.6" Code:
#10 in "/home/srivathsan/OpenFOAM/srivathsan2.2.2/platforms/linuxGccDPOpt/bin/buoyantBoussinesqSimpleFoamTemp" As for the solution? I don't know. You haven't provided the specific boundary conditions (and initial field values) you're using, nor did you indicate the configurations you have in "fvSchemes" and "fvSolution". Nor did you give the equation you've added to the solver (and where exactly you added it), so I have no clue if there is something wrong in it. Therefore, all I can do is guess... and my guess is that there is a value or field being initiated with 0... although this would lead to a SIGFPE, and not a SIGSEGV ... Best regards, Bruno
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December 10, 2013, 03:03 

#12 
Senior Member
Srivathsan N
Join Date: Jan 2013
Location: India
Posts: 101
Rep Power: 6 
Hi Bruno,
Thank you so much for that very detailed post . There were few lines which I couldn't understand in the error but you've explained them all. I have only renamed the solver that way with my own boundary condition for a particular patch. However, I have my RASproperties file reading laminar and I've just kept the default setting for the fields k, epsilon etc. Let me take a while to go back to my case and see if I've missed anything. Thanks a ton, again!
__________________
Regards, Srivaths 

December 13, 2013, 02:36 
Still persists..

#13 
Senior Member
Srivathsan N
Join Date: Jan 2013
Location: India
Posts: 101
Rep Power: 6 
Hi,
I've had a look at my case to find out the source of the error and correct it, but I'm not able to. The following are my fvSchemes and fvSolutions files. About the case: Its a modified buoyant solver with my boundary condition for a free surface in the geometry. I've kept the RASproperties file set to laminar and have retained the default settings in the fvSchemes and fvSolutions folder. I'm sure I'm missing something really simple, but what is it? fvSchemes Code:
FoamFile { version 2.0; format ascii; class dictionary; location "system"; object fvSchemes; } // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // ddtSchemes { default steadyState; } gradSchemes { default Gauss linear; } divSchemes { default none; div(phi,U) bounded Gauss upwind; div(phi,T) bounded Gauss upwind; div(phi,k) bounded Gauss upwind; div(phi,epsilon) bounded Gauss upwind; div((nuEff*dev(T(grad(U))))) Gauss linear; } laplacianSchemes { default none; laplacian(nuEff,U) Gauss linear corrected; laplacian(Dp,p_rgh) Gauss linear corrected; laplacian(alphaEff,T) Gauss linear corrected; laplacian(DREff,R) Gauss linear corrected; laplacian(DkEff,k) Gauss linear corrected; laplacian(DepsilonEff,epsilon) Gauss linear corrected; laplacian(DREff,R) Gauss linear corrected; } interpolationSchemes { default linear; } snGradSchemes { default corrected; } fluxRequired { default no; p_rgh ; } Code:
FoamFile { version 2.0; format ascii; class dictionary; location "system"; object fvSolution; } // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // solvers { p_rgh { solver PCG; preconditioner DIC; tolerance 1e08; relTol 0.01; } "(UTkepsilonR)" { solver PBiCG; preconditioner DILU; tolerance 1e05; relTol 0.1; } } SIMPLE { nNonOrthogonalCorrectors 0; pRefCell 0; pRefValue 0; residualControl { p_rgh 1e2; U 1e4; T 1e2; // possibly check turbulence fields "(kepsilonomega)" 1e3; } } relaxationFactors { fields { p_rgh 0.7; } equations { U 0.3; T 0.5; "(kepsilonR)" 0.7; } }
__________________
Regards, Srivaths 

December 28, 2013, 14:12 

#14 
Super Moderator
Bruno Santos
Join Date: Mar 2009
Location: Lisbon, Portugal
Posts: 9,919
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Rep Power: 108 
Hi Srivaths,
OK, I've given a quick read to your description and it's still not enough information I'm guessing here, but I think the problem is related to your custom boundary condition. Have a look at the following page: http://openfoamwiki.net/index.php/HowTo_debugging Best regards, Bruno
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