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Forum: Main CFD Forum

November 29, 2013, 05:22

Replies: 19

Numerical Diffusion in Star and Fluent

Views: 5,205

Posted By JBeilke

You can try the "Use TVB Gradient Limiting" and...

You can try the "Use TVB Gradient Limiting" and also increase the "Acceptable Field Variation (Factor)" to 0.1

This reduced the numerical diffusion at my passiv scala based test case.

Forum: Main CFD Forum

November 28, 2013, 13:40

Replies: 19

Numerical Diffusion in Star and Fluent

Views: 5,205

Posted By JBeilke

@MachZero I used a temperature test case and...

@MachZero

I used a temperature test case and the alternative gradient settings improved the solution quite a lot.

Now when using a passive scalar test case the original setup seems to produce...

Forum: Main CFD Forum

November 28, 2013, 02:13

Replies: 19

Numerical Diffusion in Star and Fluent

Views: 5,205

Posted By JBeilke

Set the gradient method to "Green-Gauss" and the...

Set the gradient method to "Green-Gauss" and the gradient limiter method to "Modified Venkatakrishnan".

Forum: Main CFD Forum

November 27, 2013, 10:18

Replies: 19

Numerical Diffusion in Star and Fluent

Views: 5,205

Posted By JBeilke

ccm+ can read fluent case files. So you can use...

ccm+ can read fluent case files. So you can use exactly the same mesh in both codes.

Do you use the same methodology to determine the numerical diffusion in both codes?

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