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Undesired Pressure Oscillations

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Old   May 26, 2017, 14:29
Default Undesired Pressure Oscillations
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Oğuzhan Demir
Join Date: Dec 2016
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Hi all,

I am trying to simulate external flow with a cavity using OpenFOAM. I am new to OpenFOAM and have limited knowledge about the boundary conditions of OF.

My problem is that i get unrealistic pressure contours and values on cavity base when compared to experimental data and ANSYS-Fluent analysis whşch i conduct to ensure that i'm doing nothing wrong on OpenFOAM. But as i mentioned, i get wrong results in OpenFOAM.

I'm using rhoCentralFoam and conducting analyses at 0.9 and 1.5 Mach, i will include my 0 and checkMesh files below so that someone help me. Additionally, you can see the geometry i'm working on. I'm stuck at these boundary condition selection for weeks, literally. I'll be glad if anyone can give an idea.

The geometry and the boundaries i use in Fluent are as follows:

http://imageshack.com/a/img922/875/XKmKmr.png

Actually, i am using pressure-far-field for Inlet and Far, pressure-outlet for outlet in Fluent and it works just fine! What are the corresponding boundary conditions in OF? All i need is a free stream over cavity.

Below, I have included my 0 file (p, T, U, k, omega, nut, alphat), checkMesh log file and a screenshot of the control volume.

HTML Code:
https://www.dropbox.com/sh/dy17gyomyphc774/AADpXQbvEHhnDv-snO0bdoDja?dl=0
Finally, sorry that I'm new to forum if i gave insufficient information. Feel free to ask anything that you think you might help.

Oguz
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