Pressure diverging problem during LES

BuYC123 · July 11, 2022, 02:15

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, 15:38

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.

July 11, 2022, 02:15	Pressure diverging problem during LES	#1
BuYC123 New Member Join Date: Jul 2022 Posts: 1 Rep Power: 0	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?

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July 11, 2022, 15:38		#2
fluid23 Senior Member Matt Join Date: Aug 2014 Posts: 947 Rep Power: 17	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.