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Asymmetric Flow/Symmetric Geometry Ahmed Body

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Old   March 3, 2021, 14:12
Question Asymmetric Flow/Symmetric Geometry Ahmed Body
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Hello,

I'm currently trying to do a project using Ansys Fluent on how meshing affects asymmetric flow flow patterns with a symmetric geometry (Ahmed body). My issue is I've done the following and cannot seem to witness any asymmetric flow. All 40m/s inlet velocity, exit of mesh box is a pressure outlet.

1) Steady simulations, all the way up to 2000 iterations. I started on 600 but suspected my flow might not be developed enough.
2) Transient simulations about 1100 time steps 80 iterations per. I get a symmetric flow pattern at the end of this.

In 2D simulations I can get asymmetric flow from a simple pipe expansion model. I'm not sure if maybe the asymmetry is really subtle to the point its negligible in the contours i'm look at in CFD post.

any suggestions or recommended reading are greatly appreciated.
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ahmed body, ansys, asymmetry, fluent

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