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How to Reduce Wall Y-Plus

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Old   July 23, 2006, 09:13
Default How to Reduce Wall Y-Plus
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Freinds I have solved a combustion problem using non premixed combustion model in Fluent. Am getting every thing correct but, getting a high value of wall y-plus,...

can any one tell me how to reduce wall Y-Plus,...

waiting for u'r reply,...


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Old   July 24, 2006, 01:56
Default Re: How to Reduce Wall Y-Plus
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Go to Adapt - Yplus/Ystar panel... Turn on Refine option, select wall zones yoe wih to refine, set the min and max allowed values of Yplus, and click Adapt ...

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Old   July 25, 2006, 03:27
Default Re: How to Reduce Wall Y-Plus
Ralf Schmidt
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The adapt option is ok, BUT: most of the time, it can only dubble or half the y+ values, because the position of the nodes can not be changed with that option. So changing of yplus means to add or remove a node, and the addition can only happend in the middle of a cell.

One hint: Use the smooth/swap option after adapting yplus, do some iterations until convergens, than do the yplus adaption again.

Much better is it, to build a grid with the right yplus from the beginning. Use sizing function and/or Boundary layer option in gambit.

To estimate yplus, have a look at:

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Old   July 25, 2006, 03:36
Default Re: How to Reduce Wall Y-Plus
Albert Franco
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I would build a grid imposing the yplus that I wanted, and then recalculating the cell size. As I know you need to estimate velocity of the adjacent flow, carachterist length of the problem, Cf and Ue.

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