# Setting convergence criteria for chtMultiRegionFoam

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 September 29, 2022, 12:54 Setting convergence criteria for chtMultiRegionFoam #1 Member   Nico Join Date: Jan 2022 Location: Germany Posts: 83 Rep Power: 2 Hey everyone, i would like to compare two cases with a similar problem, but with more complicated geometry respectively, to do that i want to have both cases converged. The problem is two fluids in a counterflow separated by a solid however everytime i start the calculation with a steady state chtMultiRegionFoam i get following: Code: ```Create time Create fluid mesh for region fluidhot for time = 0 Create fluid mesh for region fluidcold for time = 0 Create solid mesh for region plate for time = 0 PIMPLE: Region fluidhot PIMPLE: No convergence criteria found PIMPLE: Region fluidcold PIMPLE: No convergence criteria found PIMPLE: Region plate PIMPLE: No convergence criteria found PIMPLE: Operating solver in steady-state mode with 1 outer corrector PIMPLE: Operating solver in SIMPLE mode``` the fvsolution of one of the fluids looks like the following (they have the same entries): Code: ```solvers { "p_rgh.*" { solver GAMG; smoother symGaussSeidel; tolerance 1e-3; relTol 0.01; } "(U|h|k|epsilon).*" { solver PBiCGStab; preconditioner DILU; tolerance 1e-3; relTol 0.1; } } PIMPLE { momentumPredictor yes; outerCorrectorResidualControl { "(U|k|epsilon)" { relTol 0; tolerance 1e-6; } } } relaxationFactors { fields { rho 1.0; p_rgh 0.7; } equations { U 0.3; h 0.7; k 0.7; epsilon 0.7; } } // ************************************************************************* //``` i couldn't find information to solve this alone so any help is greatly appreciated! Last edited by Hr_kules; September 29, 2022 at 13:02. Reason: typo/additional info

 October 10, 2022, 06:28 #2 Member   Nico Join Date: Jan 2022 Location: Germany Posts: 83 Rep Power: 2 If someone comes across thge same rookie mistake i made the issue was resolved by typing: Code: ```PIMPLE { residualControl { "(U|p_rgh).*" 1e-3; } convergenceCriterion 1e-3; nNonOrthogonalCorrectors 1; }``` Hope this helps someone i the future.

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