code_saturne User's Forum

Dear Code Saturne Forum Team,

I am a student at FH Aachen University of applied sciences. In my Lab work I have made a computation of an axial blood pump in Code_Saturne:
- Calculation features: Unsteady flow
- Turbulence model: no model
- …..
Everything was fine and we got results.

After I created a finer mesh and started to calculate it I got errors.
I would like to ask you for support. Attached you can find the listing and error files.
Thank you very much.

Best regards,

I.K.

Hello,

Did you reduce the time step with the fine mesh ? The CFL numbers seem to be very high almost immediately, and are probably the cause of the crash.

Regards,

Yvan

Hello,

thanks for your answer.

For the time step I choose: Pseudo time step: - Reference time step: 0.002s
- Number of itereations: 2000

Hello,

If the CFL is too high (check CFL our Courant in the listing), you need to reduce the time step.

The best practice recommendations in the documentation section of this web site provides more details.

Regards,

Yvan