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SST k-omega and boundary layer mesh on inlet and outlet surface

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08-12-2013 01:52 AM

Hello, I was trying to solve an analysis using SST k-omega model. But when I modified Layer gradation to 1.5 or another value not the default setting on the Boundary Mesh Enhancement dialog, the boundary layer mesh on the inlet and outlet surface disappeared. Why?

Thanks.

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Registered: ‎08-24-2011

Re: SST k-omega and boundary layer mesh on inlet and outlet surface

08-15-2013 01:01 PM in reply to: amy.jin

Hi Amy,

 

Is this from a ProE model?

 

As a side note I would not suggest increasing the boundary layer much beyond 1.25. From my testing I find that 1.15 is a decent value to use.

 

-Royce



Royce Abel
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Re: SST k-omega and boundary layer mesh on inlet and outlet surface

08-19-2013 01:56 AM in reply to: amy.jin

Hi Royce,

 

Thanks for your reply.

The model is launched from ProE.

I have tested 1.15, the boundary layer mesh on inlet surface is very strange when refine the mesh, pls see the attachment.

In fact, the problem I cared most is about the boundary layer mesh.

I found that if refine the mesh very fine, the bondary layer mesh on inlet and outlet surface will be likely to disappear. Why?

Another question, when using SST k-omega to solve, the Y+ value is very large more than 300 at boundary layer.

How can I improve this situation?

Thanks very much.

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Registered: ‎08-31-2011

Re: SST k-omega and boundary layer mesh on inlet and outlet surface

08-19-2013 08:00 AM in reply to: amy.jin

This at times can be an acuracy issue. Try launching in from Pro/e using a tighter (smaller) absolute accuracy on the proe geometry and see if this helps resolve some of the issues.

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Re: SST k-omega and boundary layer mesh on inlet and outlet surface

09-09-2013 02:17 AM in reply to: apolo.vanderberg

Hi Royce and Apolo,

 

The problem has been solved.

It is really caused by accuracy.

Thanks very much.