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Courant number is spiking in very small section |
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#1 |
Senior Member
Desh
Join Date: Mar 2021
Location: Sydney
Posts: 109
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Hi All,
I am running a venting event in 2D wedge domain with rhoPimpleFoam in OF10. Please see the attached figure. My fluid domain is roughly 0.7 m (height) x 0.1 m (radius) of a wedge. From the bottom surface of the wedge I've assigned my outlet. The question is solver is choosing very small time stepping (1E-9/10). Reason for this is only few cells Co no is reaching to 1 whilst all the rest remains under 1e-8 or so. My mesh is clean, and no errors at all.. How can I avoid this few cells Co being increased so I can increase my overall time stepping ? Any insights are highly appreciated. Thank you. Dasith |
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#2 |
Senior Member
Desh
Join Date: Mar 2021
Location: Sydney
Posts: 109
Rep Power: 5 ![]() |
Sorry forgot to attached the figure
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#3 |
Senior Member
Josh Williams
Join Date: Feb 2021
Location: Scotland
Posts: 113
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#4 | |
Senior Member
Desh
Join Date: Mar 2021
Location: Sydney
Posts: 109
Rep Power: 5 ![]() |
Quote:
Hi, Thank you for your reply. Apologies for the misinterpretation of the problem. The mesh in the figure is only one iterations of me trying to avoid the Co spike. I tried simpleGrading to make the mesh for uniform/refine/course basically everything. Nothing works. However that boundry has a pressure gradient of delataP = 200MPa- 0.1MPa Following are the pressure and velocity boundary conditions I am using; PHP Code:
PHP Code:
Thank you |
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