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problem regarding solver running two times

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Old   October 19, 2023, 04:08
Default problem regarding solver running two times
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Vishal Garg
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Hello everyone,
I am running chtmultiregionsimplefoam for solving solid and fluid regions in concentric cylinder. Now the problem i am facing is that the solver is running two times for pipe_1 and pipe_2 and p_rgh for water region.
can anyone tell me why solver is solving these for two times?
I am attaching the simulation.
Thanks in advance





Time = 8488


Solving for fluid region water
DILUPBiCGStab: Solving for Ux, Initial residual = 2.507399e-08, Final residual = 1.415443e-10, No Iterations 1
DILUPBiCGStab: Solving for Uy, Initial residual = 5.153429e-08, Final residual = 2.864192e-10, No Iterations 1
DILUPBiCGStab: Solving for Uz, Initial residual = 3.702059e-09, Final residual = 3.702059e-09, No Iterations 0
DILUPBiCGStab: Solving for h, Initial residual = 6.314294e-05, Final residual = 5.728423e-07, No Iterations 1
limitTemperature limitT Lower limited 0 (0%) of cells, with min limit 300
limitTemperature limitT Upper limited 0 (0%) of cells, with max limit 465
limitTemperature limitT Unlimited Tmin 300.0003
limitTemperature limitT Unlimited Tmax 391.0836
Min/max T:300 400
GAMG: Solving for p_rgh, Initial residual = 1.410428e-07, Final residual = 9.999433e-08, No Iterations 24
GAMG: Solving for p_rgh, Initial residual = 9.999433e-08, Final residual = 9.999433e-08, No Iterations 0
time step continuity errors : sum local = 5.658036e-07, global = -8.6012e-09, cumulative = -0.04589086
Min/max rho:1000 1000
DILUPBiCGStab: Solving for epsilon, Initial residual = 9.982368e-09, Final residual = 9.982368e-09, No Iterations 0
DILUPBiCGStab: Solving for k, Initial residual = 1.405872e-08, Final residual = 8.006672e-11, No Iterations 1

Solving for solid region pipe_1
GAMG: Solving for h, Initial residual = 2.577401e-05, Final residual = 1.875361e-10, No Iterations 1
limitTemperature limitT Lower limited 0 (0%) of cells, with min limit 300
limitTemperature limitT Upper limited 0 (0%) of cells, with max limit 465
limitTemperature limitT Unlimited Tmin 300.8637
limitTemperature limitT Unlimited Tmax 387.3766
Min/max T:300.7518 387.8024

Solving for solid region pipe_1
GAMG: Solving for h, Initial residual = 2.487348e-05, Final residual = 1.29597e-10, No Iterations 1
limitTemperature limitT Lower limited 0 (0%) of cells, with min limit 300
limitTemperature limitT Upper limited 0 (0%) of cells, with max limit 465
limitTemperature limitT Unlimited Tmin 300.8638
limitTemperature limitT Unlimited Tmax 387.3776
Min/max T:300.7519 387.8031

Solving for solid region pipe_2
GAMG: Solving for h, Initial residual = 1.123358e-06, Final residual = 2.516377e-11, No Iterations 1
limitTemperature limitT Lower limited 0 (0%) of cells, with min limit 300
limitTemperature limitT Upper limited 0 (0%) of cells, with max limit 465
limitTemperature limitT Unlimited Tmin 300.0083
limitTemperature limitT Unlimited Tmax 399.3518
Min/max T:300.0078 400

Solving for solid region pipe_2
GAMG: Solving for h, Initial residual = 1.088135e-06, Final residual = 2.445573e-11, No Iterations 1
limitTemperature limitT Lower limited 0 (0%) of cells, with min limit 300
limitTemperature limitT Upper limited 0 (0%) of cells, with max limit 465
limitTemperature limitT Unlimited Tmin 300.0083
limitTemperature limitT Unlimited Tmax 399.3518
Min/max T:300.0078 400
ExecutionTime = 145336.9 s ClockTime = 145347 s
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Old   October 19, 2023, 04:22
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Hey!


I believe it is a normal behavior when you set nNonOrthogonalCorrectors to 1 or more in the fvSolution files of the different regions. If you want just one iteration, set it to zero. But if your mesh has some non-orthogonality, it may help with convergence to leave it at 1 or more, especially for fluid regions.
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