rhoPimpleFoam - Maximum number of iterations exceeded

kalei · August 29, 2017, 04:50

Hallo,
when running rhoPimpleFOAM to simulate a high mach number compressible gas flow I get the following error:

PIMPLE: iteration 1
smoothSolver: Solving for Ux, Initial residual = 0.01727963417, Final residual = 9.70350519e-07, No Iterations 3
smoothSolver: Solving for Uy, Initial residual = 0.002102322572, Final residual = 9.666745303e-08, No Iterations 3
smoothSolver: Solving for Uz, Initial residual = 0.01773571813, Final residual = 3.83106408e-08, No Iterations 4
DILUPBiCG: Solving for h, Initial residual = 0.03497107833, Final residual = 1.879401836e-06, No Iterations 2
0] [2]
[2]
[2] --> FOAM FATAL ERROR:
[2] Maximum number of iterations exceeded
[2]
[2] 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

I already tested a lot of things. E.g. by changing nOuterCorrectors, nCorrectors and tolerances I can delay the error. However, I did not succeed to completely prevent it. Can anybody give me a hint what is the origin of the error and how I can prevent it.

Best
kalei

windscion · September 8, 2017, 13:00

Despite the flow and h being okay, it might yet be a grid problem. More likely, it could be a boundary condition problem. Since each field has different BCs, that seems more likely.
Also, when in doubt, try reducing dt.

August 29, 2017, 04:50	rhoPimpleFoam - Maximum number of iterations exceeded	#1
kalei New Member kalei Join Date: Oct 2014 Posts: 5 Rep Power: 11	Hallo, when running rhoPimpleFOAM to simulate a high mach number compressible gas flow I get the following error: PIMPLE: iteration 1 smoothSolver: Solving for Ux, Initial residual = 0.01727963417, Final residual = 9.70350519e-07, No Iterations 3 smoothSolver: Solving for Uy, Initial residual = 0.002102322572, Final residual = 9.666745303e-08, No Iterations 3 smoothSolver: Solving for Uz, Initial residual = 0.01773571813, Final residual = 3.83106408e-08, No Iterations 4 DILUPBiCG: Solving for h, Initial residual = 0.03497107833, Final residual = 1.879401836e-06, No Iterations 2 0] [2] [2] [2] --> FOAM FATAL ERROR: [2] Maximum number of iterations exceeded [2] [2] 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 I already tested a lot of things. E.g. by changing nOuterCorrectors, nCorrectors and tolerances I can delay the error. However, I did not succeed to completely prevent it. Can anybody give me a hint what is the origin of the error and how I can prevent it. Best kalei

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September 8, 2017, 13:00		#2
windscion New Member Thomas Evans Join Date: Dec 2015 Posts: 21 Rep Power: 10	Despite the flow and h being okay, it might yet be a grid problem. More likely, it could be a boundary condition problem. Since each field has different BCs, that seems more likely. Also, when in doubt, try reducing dt.