code_saturne User's Forum

Hi all,

I am running an atmospheric simulation, but it stops every time when it reaches around 360 time steps (time step is 1s in my case), due to this problem:

Symmetric Gauss-Seidel [Velocity]: divergence after 1 iterations:
initial residual: -nan; current residual: -nan

Symmetric Gauss-Seidel: error (divergence) solving for Velocity

I have changed different Gradient reconstruction type, but all Gauss options have this same error. Do you know how to fix it? I attached my run.log and a picture of the mesh. Thanks for your help!

Sophie

Hello,

You could increase the logging and postprocessing frequency to get more info on field values when the code starts preventing backflow at the outlet, and a bit before the divergence occurs. Running with a debug build may also help detect some error categories earlier.

Note that v7.0 is not maintained anymore, so upgrading to a current version is also recommended.

Best regards,

Yvan