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nagetive time marching, ggi patch, rotating frame. |
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February 9, 2020, 19:29 |
nagetive time marching, ggi patch, rotating frame.
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#1 |
Member
Bidesh Sengupta
Join Date: Sep 2018
Location: Sngapore
Posts: 76
Rep Power: 7 |
Hi Foamers!
I am trying to simulate a rotating wing with a fixed rpm. Schematic of my problem is attached. When I am trying to run the simulation, it giving negative time. Code:
Create time Create dynamic mesh for time = 0 Selecting dynamicFvMesh turboFvMesh Initializing the GGI interpolator between master/shadow patches: RotorGGI/StatorGGI Turbomachine Mixer mesh: origin: (0 0 0) axis : (0 0 1) Reading thermophysical properties Selecting thermodynamics package hPsiThermo<pureMixture<constTransport<specieThermo<hConstThermo<perfectGas>>>>> Allocating field rho Reading field U Reading/calculating face flux field phi Creating MRF model Creating turbulence model Selecting turbulence model type RASModel Selecting RAS turbulence model laminar Create Riemann solver Allocating field rhoU Allocating field rhoE Allocating physDeltaT list for RK and Dual-Time Stepping Creating oldTime fields for dual-time stepping Starting time loop Creating ggi check function object Moving Cell Zone Name: cellRegion0 rpm: 1250 Moving Cell Zone Name: cellRegion1 rpm: 0 Moving Face Zone Name: RotorGGI_faces rpm: 1250 Time = -0.0008517870533 diagonal: Solving for rho, Initial residual = 0, Final residual = 0, No Iterations 0 diagonal: Solving for rhoUx, Initial residual = 0, Final residual = 0, No Iterations 0 diagonal: Solving for rhoUy, Initial residual = 0, Final residual = 0, No Iterations 0 diagonal: Solving for rhoUz, Initial residual = 0, Final residual = 0, No Iterations 0 diagonal: Solving for rhoE, Initial residual = 0, Final residual = 0, No Iterations 0 bounding rho, min: -8002.780332 max: 1126.854835 average: 0.2519080825 new min: 0.8002967477 new max: 1.999596239 bounding rhoE, min: -2413391697 max: 338960313.3 average: -24780.12515 new min: 50034.0114 new max: 999650.5291 bounding U max: 16551.47357 bounding h, min: -710.4404189 max: 907465.0083 average: 306656.9902 new min: 10023.24515 bounding p, min: 2675.587422 max: 401158.8261 average: 104114.4592 new min: 10000.03539 rho L2 Residual: 4.806956853 rho LInf Residual: 6.972972733 My boundary file is: RotorGGI { type ggi; nFaces 21232; startFace 36777457; rotationAxis (0 0 1); nCopies 30; shadowPatch StatorGGI; zone RotorGGI_faces; bridgeOverlap true; } blade { type wall; nFaces 1135638; startFace 36798689; } farfield { type patch; nFaces 60000; startFace 37934327; } StatorGGI { type ggi; nFaces 38736; startFace 37994327; rotationAxis (0 0 1); nCopies 30; shadowPatch RotorGGI; zone StatorGGI_faces; bridgeOverlap true; } Have anyone encountered this kind of problem before. If anyone can give me a clue about this, I shall be really helped. Thanks a lot for your time. |
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February 11, 2020, 13:17 |
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#2 |
Senior Member
Herpes Free Engineer
Join Date: Sep 2019
Location: The Home Under The Ground with the Lost Boys
Posts: 932
Rep Power: 12 |
wow, time travel with OpenFOAM! OpenFOAM is very powerful as always.
Could you please provide a test case, so that we can replicate the reported issue?
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February 12, 2020, 02:18 |
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#3 |
Member
Bidesh Sengupta
Join Date: Sep 2018
Location: Sngapore
Posts: 76
Rep Power: 7 |
HI,
Many thanks for your reply. Just few observations that I made. The case is running well with rhoPimpleDyMFoam. But I wish to run this case with dbns solver so I tried transonicMRFDyMFoam, this creates all the problem, although I could run a simple case withis solver. (Figure attached.) I am trying to verify Caradonna Tung case. The solver ran well for very small time and suddenly went to negative time and crashed. Code:
GGI pair (cylr, cyls) Area: 1.275277793 1.277828438 Diff = -0.002550645763 or 0.1996078414 % Flux: 5.127987472 5.377813765 Diff = -0.3272316814 or 6.381288627 % GGI pair (discrl, discsl) Area: 5.30890084 5.31952395 Diff = -0.01062311045 or 0.199700397 % Flux: 56.36113422 56.36637665 Diff = -0.01146315011 or 0.02033874987 % GGI pair (discru, discsu) Area: 5.30890084 5.31952395 Diff = -0.01062311045 or 0.199700397 % Flux: 50.45643701 50.43524362 Diff = -0.01267533051 or 0.02512133488 % Time = 4.508921598e-06 diagonal: Solving for rho, Initial residual = 0, Final residual = 0, No Iterations 0 diagonal: Solving for rhoUx, Initial residual = 0, Final residual = 0, No Iterations 0 diagonal: Solving for rhoUy, Initial residual = 0, Final residual = 0, No Iterations 0 diagonal: Solving for rhoUz, Initial residual = 0, Final residual = 0, No Iterations 0 diagonal: Solving for rhoE, Initial residual = 0, Final residual = 0, No Iterations 0 rho L2 Residual: 3.46313128 rho LInf Residual: 4.763521822 BiCGStab: Solving for epsilon, Initial residual = 0.9999950781, Final residual = 2.212067388e-14, No Iterations 1 BiCGStab: Solving for k, Initial residual = 0.008327140338, Final residual = 2.044108189e-16, No Iterations 1 ExecutionTime = 78.21 s GGI pair (cylr, cyls) Area: 1.275277793 1.277828438 Diff = -0.002550645763 or 0.1996078414 % Flux: 5.131371036 5.386445304 Diff = -0.337659898 or 6.580305646 % GGI pair (discrl, discsl) Area: 5.30890084 5.31952395 Diff = -0.01062311045 or 0.199700397 % Flux: 56.36112165 56.36636457 Diff = -0.01147948593 or 0.0203677386 % GGI pair (discru, discsu) Area: 5.30890084 5.31952395 Diff = -0.01062311045 or 0.199700397 % Flux: 50.45640114 50.43519843 Diff = -0.01269114308 or 0.02515269182 % Time = -0.0002009053193 diagonal: Solving for rho, Initial residual = 0, Final residual = 0, No Iterations 0 diagonal: Solving for rhoUx, Initial residual = 0, Final residual = 0, No Iterations 0 diagonal: Solving for rhoUy, Initial residual = 0, Final residual = 0, No Iterations 0 diagonal: Solving for rhoUz, Initial residual = 0, Final residual = 0, No Iterations 0 diagonal: Solving for rhoE, Initial residual = 0, Final residual = 0, No Iterations 0 bounding rho, min: -19.10611878 max: 40.90783651 average: 0.9802035543 new min: 1e-06 new max: 9.999680957 bounding rhoE, min: -7694045.878 max: 17575530.49 average: 217490.5868 new min: 10000 new max: 1000000 bounding U max: 1.105151028e+10 bounding h, min: -693476.5548 max: 9.102065628e+11 average: 59528188.91 new min: 10000 new max: 100000000 rho L2 Residual: 3.456650242 rho LInf Residual: 4.787876414 BiCGStab: Solving for epsilon, Initial residual = 0.9999999522, Final residual = 4.955930645e-12, No Iterations 1 BiCGStab: Solving for k, Initial residual = 0.1883215581, Final residual = 6.680483789e-12, No Iterations 1 ExecutionTime = 88.02 s GGI pair (cylr, cyls) Area: 1.275277793 1.277828438 Diff = -0.002550645763 or 0.1996078414 % Flux: 5.598183521 5.294696389 Diff = -0.2341575821 or 4.182742156 % GGI pair (discrl, discsl) Area: 5.30890084 5.31952395 Diff = -0.01062311045 or 0.199700397 % Flux: 56.35205222 56.35510544 Diff = -0.01107282278 or 0.01964936918 % GGI pair (discru, discsu) Area: 5.30890084 5.31952395 Diff = -0.01062311045 or 0.199700397 % Flux: 50.26947062 50.25606473 Diff = -0.01603900949 or 0.03190606405 % Time = -0.006116840835 [bidesh:26460] *** Process received signal *** [bidesh:26460] Signal: Floating point exception (8) [bidesh:26460] Signal code: (-6) [bidesh:26460] Failing at address: 0x3e80000675c [bidesh:26460] [ 0] /lib/x86_64-linux-gnu/libc.so.6(+0x3ef20)[0x7f6deb858f20] [bidesh:26460] [ 1] /lib/x86_64-linux-gnu/libc.so.6(gsignal+0xc7)[0x7f6deb858e97] [bidesh:26460] [ 2] /lib/x86_64-linux-gnu/libc.so.6(+0x3ef20)[0x7f6deb858f20] [bidesh:26460] [ 3] /home/bidesh/foam/bidesh-4.0/lib/linux64GccDPOpt/libGodunovFlux.so(_ZNK4Foam10roeALEFlux12evaluateFluxERdRNS_6VectorIdEES1_ddS3_S3_ddddddS3_dS3_d+0x440)[0x7f6ded86d140] [bidesh:26460] [ 4] transonicMRFDyMFoam(+0xac444)[0x563f19f38444] [bidesh:26460] [ 5] transonicMRFDyMFoam(+0x3b68c)[0x563f19ec768c] [bidesh:26460] [ 6] /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xe7)[0x7f6deb83bb97] [bidesh:26460] [ 7] transonicMRFDyMFoam(+0x40aba)[0x563f19eccaba] [bidesh:26460] *** End of error message *** [bidesh:26456] *** Process received signal *** [bidesh:26456] Signal: Floating point exception (8) [bidesh:26456] Signal code: (-6) [bidesh:26456] Failing at address: 0x3e800006758 [bidesh:26456] [ 0] /lib/x86_64-linux-gnu/libc.so.6(+0x3ef20)[0x7f21dbd3cf20] [bidesh:26456] [ 1] /lib/x86_64-linux-gnu/libc.so.6(gsignal+0xc7)[0x7f21dbd3ce97] [bidesh:26456] [ 2] /lib/x86_64-linux-gnu/libc.so.6(+0x3ef20)[0x7f21dbd3cf20] [bidesh:26456] [ 3] /home/bidesh/foam/bidesh-4.0/lib/linux64GccDPOpt/libGodunovFlux.so(_ZNK4Foam10roeALEFlux12evaluateFluxERdRNS_6VectorIdEES1_ddS3_S3_ddddddS3_dS3_d+0x440)[0x7f21ddd51140] [bidesh:26456] [ 4] transonicMRFDyMFoam(+0xac444)[0x556f1e0b2444] [bidesh:26456] [ 5] transonicMRFDyMFoam(+0x3b68c)[0x556f1e04168c] [bidesh:26456] [ 6] /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xe7)[0x7f21dbd1fb97] [bidesh:26456] [ 7] transonicMRFDyMFoam(+0x40aba)[0x556f1e046aba] [bidesh:26456] *** End of error message *** -------------------------------------------------------------------------- mpirun noticed that process rank 4 with PID 26456 on node bidesh exited on signal 8 (Floating point exception). Thanks a lot. |
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