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Adapting the mesh in Fluent

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Old   January 13, 2014, 01:39
Default Adapting the mesh in Fluent
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Sudipta Ray
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Hi everyone,
I am solving a problem of boundary-layer flow in fluent 13. To apply a particular turbulence model, I need to have a specific range of Y+ value at the wall. But the grid I'm creating in Gambit is not sufficient for it. Thus I'm trying to adapt the mesh via the y+ adaption scheme of Ansys Fluent itself. Is this particularly helpful? Fluent has created some hanging node mesh near the wall. I'm attaching the plot of wall y+ below. Please suggest if this technique is useful or not.
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File Type: jpg Wall_y+_plot_lengthwise.JPG (25.6 KB, 46 views)
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Old   January 18, 2014, 19:12
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LDA
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Yes it is useful. But the mesh element size will increase considerably if you have a poor mesh initially.

Try to use a higher quality mesh generator such as Pointwise. With their special technique it is far effective to modify a BL mesh compared to those in Gambit.

Good luck
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Old   January 18, 2014, 19:14
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By the way, instead of checking y star check y+
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Old   January 19, 2014, 02:19
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Sudipta Ray
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thanks LDA, i've meant to upload the y+ plot but somehow accidentally the y* one was uploaded. Also, about the initial mesh quality, I can say the mesh was structured with maximum aspect ratio 11.1 and minimum orthogonal quality 0.585. Is it not good enough, since I've read allowable orthogonal quality 0.5-1 and aspect ratio < 50. What can be said about this?
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File Type: jpg Wall_y+_plot.JPG.jpg (92.3 KB, 23 views)

Last edited by Sudipta Ray; January 19, 2014 at 02:28. Reason: attachment
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fluent 13, mesh adaption, turbulence model, wall y+

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