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yplus=o???????,in wall function,kepsilon,need help

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Old   October 15, 2006, 02:49
Default yplus=o???????,in wall function,kepsilon,need help
  #1
ramy
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flow of water,steady and isothermal case,kepsilon,wall function:standard yplus =o------ whats the problem? best regards
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Old   October 15, 2006, 03:19
Default Re: yplus=o???????,in wall function,kepsilon,need
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sam
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is there any sepration in the region of y plus 0?
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Old   October 15, 2006, 03:27
Default Re: yplus=o???????,in wall function,kepsilon,need
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ramy
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I don't understand your question
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Old   October 15, 2006, 06:17
Default Re: yplus=o???????,in wall function,kepsilon,need
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ice
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when did you check the y+, before the Iteration or after it?
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Old   October 15, 2006, 10:20
Default Re: yplus=o???????,in wall function,kepsilon,need
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ramy
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after converging of results(after iteration)
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Old   October 15, 2006, 12:46
Default Re: yplus=o???????,in wall function,kepsilon,need
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Ralf Schmidt
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Hi!

Are you sure, that it is = 0 ??? it might be so small, that the resolution in the plot window make it appears like 0.

Maybe, you are not plotting yplus on a wall - BUT it is only defined for a wall!! In other word: are u sure, that the bondary you used for plotting it a wall??

Another reason might be the plot direction. If you have a wall that is parallel to x-axis, and you plot on y-axis, Fluent returnes 0.

Hope, it helps - I don't see any other explenation...

Ralf
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Old   October 17, 2006, 00:54
Default Re: yplus=o???????,in wall function,kepsilon,need
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sam
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y plus is calculated on the basis of shear stress. in the region of sepration therefore yplus(for wall fuction) = 0 . therefore i asked that are u reporting y plus 0 for the region of sepration of attached flow. hope u understand my point

regards sam

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Old   November 2, 2006, 06:02
Default convergence problem while using pressure inputs
  #8
Ashok kumar
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I get convergence problem for incompressible flow when i use boundary inputs both in terms of pressure. I even reduced the relaxation to 0.1 for all the terms still i get the same problem. Anyone help me on this.
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Old   November 3, 2006, 13:58
Default Re: convergence problem while using pressure input
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babak
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maybe you have reversed flow problem. check your operating pressure
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