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-   -   Pressure diverging problem during LES (https://www.cfd-online.com/Forums/star-ccm/243871-pressure-diverging-problem-during-les.html)

BuYC123 July 11, 2022 03:15

Pressure diverging problem during LES
 
I am trying LES with 0.0005s time step,

but pressure is diverging for some time steps.

Solution is not always diverging, and divergence occurs about once per 100 time step.

I checked velocity field, but velocity didn't divereged and only pressure had diverged to infinite or negative-infinite.

I tried LES with other mesh settings with finer meshes, but same problem occurred.

Does someone have any idea for reason or solution for this problem?

fluid23 July 11, 2022 16:38

What drove you to that time step? Are you sure that your CFL number is appropriate? Knowing what you are trying to model would help. 'Trying LES' can mean a lot of things.


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