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-   -   solution singularity (http://www.cfd-online.com/Forums/openfoam-solving/59814-solution-singularity.html)

litonx February 20, 2007 19:28

Hi Could some one please t
 
Hi

Could some one please tell me, why I am getting following message while I simulate a 3D simple domain with simpleFoam solver. Is it due to the improper boundary condition definition?

BICCG: Solving for Ux: solution singularity
BICCG: Solving for Uy: solution singularity
BICCG: Solving for Uz: solution singularity
ICCG: Solving for p: solution singularity
time step continuity errors : sum local = nan, global = nan, cumulative = nan
BICCG: Solving for epsilon: solution singularity
BICCG: Solving for k: solution singularity

-Liton

hjasak February 21, 2007 02:32

Yes: you have probably messed
 
Yes: you have probably messed up the boundary conditions, e.g. specified both the pressure and velocity on the same patch. Other possibilities are things like using zero viscosity and central differencing on convection, not under-relaxing the equations or similar.

As a result, your solver is doing division by zero or a similar error. If you want to stop producing NaN-s or maybe even find out precisely how it fails, try:

setenv FOAM_SIGFPE 1

Hrv


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