Which y+?

Lea · December 14, 2012, 05:07

Hey,

I simulate a water flow in a pipe and I want to make the mesh right so that y+ is right. I already searched for a list that tells me which value y+ must be like depending on the model (e.g. k-e model,k-omega...) but I can't find anything in the theory-,users- and tutorial guide.
Maybe you can tell me a source where I can find this.

Thank you=)

ghost82 · December 14, 2012, 05:28

I can suggest to read this:
Wall y+ Strategy for Dealing with Wall-bounded Turbulent Flows
Authors: Salim .M. Salim, and S.C. Cheah

There are comparisons between k-epsilon, k-omega, spalart-allmaras and RSM, with standard and enhanced wall functions.

Daniele

eishinsnsayshin · December 18, 2012, 13:24

Hey try reading around 4.13 in the Theory Guide: Near-wall treatments for wall bounded turbulent flows.

You can also get there by searching in the help section for fluent "viscous model dialog box" (36.3.3) and click the link for "steps in using a turbulence model" at the top, then there will be a link in that section for near wall treatments for wall bounded flows.

Hope this at least gets you started!

December 14, 2012, 05:07	Which y+?	#1
Lea New Member Join Date: Dec 2012 Posts: 10 Rep Power: 13	Hey, I simulate a water flow in a pipe and I want to make the mesh right so that y+ is right. I already searched for a list that tells me which value y+ must be like depending on the model (e.g. k-e model,k-omega...) but I can't find anything in the theory-,users- and tutorial guide. Maybe you can tell me a source where I can find this. Thank you=)

December 14, 2012, 05:28		#2
ghost82 Senior Member Rick Join Date: Oct 2010 Posts: 1,016 Rep Power: 26	I can suggest to read this: Wall y+ Strategy for Dealing with Wall-bounded Turbulent Flows Authors: Salim .M. Salim, and S.C. Cheah There are comparisons between k-epsilon, k-omega, spalart-allmaras and RSM, with standard and enhanced wall functions. Daniele

December 18, 2012, 13:24		#3
eishinsnsayshin Member Join Date: Jun 2011 Posts: 48 Rep Power: 14	Hey try reading around 4.13 in the Theory Guide: Near-wall treatments for wall bounded turbulent flows. You can also get there by searching in the help section for fluent "viscous model dialog box" (36.3.3) and click the link for "steps in using a turbulence model" at the top, then there will be a link in that section for near wall treatments for wall bounded flows. Hope this at least gets you started!