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#1 |
Senior Member
jeff osborne
Join Date: Mar 2010
Posts: 108
Rep Power: 16 ![]() |
Hello all,
I'm trying to do a simulation using simpleFoam, turbulent model komega and trying to use an upwind discretisation scheme. When I run it, I get the follow outputs: Time = 1000 DILUPBiCG: Solving for Ux, Initial residual = 0.0531176, Final residual = 4.97151e-08, No Iterations 3 DILUPBiCG: Solving for Uy, Initial residual = 0.0524418, Final residual = 2.62207e-08, No Iterations 3 DICPCG: Solving for p, Initial residual = 0.378508, Final residual = 7.74833e-08, No Iterations 182 time step continuity errors : sum local = 8.80457e+47, global = -2.78683e+45, cumulative = -4.87884e+45 DILUPBiCG: Solving for omega, Initial residual = 0.0812003, Final residual = 5.90716e-08, No Iterations 3 DILUPBiCG: Solving for k, Initial residual = 0.145069, Final residual = 1.30273e-09, No Iterations 4 As you can see, my time step continuity errors are enormous. I think the issue is in my fvschemes file, but I can't seem to find where. Here is my fvschemes file: ddtSchemes { default steadyState; } interpolationSchemes { default upwind phi; } gradSchemes { default Gauss upwind phi; } divSchemes { default Gauss upwind phi; } laplacianSchemes { default Gauss upwind phi corrected; } snGradSchemes { default corrected; } fluxRequired { default no; p ; U; } If anyone has any suggestions that'd be awesome, I really need some help with this one. Thanks -J |
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#2 |
Senior Member
jeff osborne
Join Date: Mar 2010
Posts: 108
Rep Power: 16 ![]() |
Additional info: When I use a central differencing scheme, the solution is stable. However, I need to use upwind, so I'm not sure what's going on here.
THanks again |
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