how yPlus can affect the result?

zandi · January 9, 2010, 16:02

hi
I use k-epsilon for my problem in cfx
I want to know if the yplus goes under 20 (as the limit of the parameter in this turbulent model), all of the simulation would be failed?
I don't want to check the parameters near the walls but I want to make meshes finner because the tangentical velocity vectors in the sections change due to this refining (the view of them).
I would appreciate your consult.

Tristan · January 11, 2010, 12:54

Having y+ values less than twenty will not cause the simulation to fail. See the discussion of scalable wall functions in the ANSYS CFX-Solver Theory Guide for more detail on how CFX handles the near wall region with wall functions.

Tristan

zandi · January 14, 2010, 03:09

Quote:

Originally Posted by Tristan

Having y+ values less than twenty will not cause the simulation to fail. See the discussion of scalable wall functions in the ANSYS CFX-Solver Theory Guide for more detail on how CFX handles the near wall region with wall functions.

Tristan

thank you very much

January 9, 2010, 16:02	how yPlus can affect the result?	#1
zandi Senior Member Fatema Zandi Goharrizi Join Date: Mar 2009 Posts: 158 Rep Power: 17	hi I use k-epsilon for my problem in cfx I want to know if the yplus goes under 20 (as the limit of the parameter in this turbulent model), all of the simulation would be failed? I don't want to check the parameters near the walls but I want to make meshes finner because the tangentical velocity vectors in the sections change due to this refining (the view of them). I would appreciate your consult.

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January 11, 2010, 12:54		#2
Tristan Member Tristan Burton Join Date: Mar 2009 Posts: 43 Rep Power: 18	Having y+ values less than twenty will not cause the simulation to fail. See the discussion of scalable wall functions in the ANSYS CFX-Solver Theory Guide for more detail on how CFX handles the near wall region with wall functions. Tristan