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

Hi
Could some one please tHi
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 |

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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