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December 1, 2014, 02:38 |
Radiation convergence problem
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#1 |
Senior Member
Join Date: Oct 2013
Posts: 397
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I'm currently running a simulation using the P1 radiation model and I notice extremely high residuals which don't appear to converge:
Code:
DICPCG: Solving for G, Initial residual = 1, Final residual = 3.98945e+15, No Iterations 1001 Any idea what could be causing this? checkMesh seems to be ok, only thing is that one patch is "multiply connected (shared edge)". Still, it fails no quality check. fvSolution: Code:
"G.*" { solver PCG; preconditioner DIC; tolerance 1e-08; relTol 0; } |
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December 1, 2014, 03:25 |
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#2 |
Senior Member
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Posts: 397
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I switched to the GAMG multigrid algorithm and it no longer crashed in the first time step and looks reasonable.
However, now it crashes in the second time step Can anyone explain why some algorithms fail sometimes while others work? Last edited by chriss85; December 1, 2014 at 04:36. |
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December 2, 2014, 03:47 |
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#3 |
Senior Member
Join Date: Oct 2013
Posts: 397
Rep Power: 18 |
It seems to be working now, I think there was an error in my input data (material libraries), however, I still don't understand why the matrix solvers behave differently regarding convergence behavior (not convergence speed, but rather convergence itself). Do they have different stability ranges?
Last edited by chriss85; December 2, 2014 at 09:26. |
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