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-   -   Why does y+ increase after computing? (http://www.cfd-online.com/Forums/fluent/71035-why-does-y-increase-after-computing.html)

aescarbi December 13, 2009 09:45

Why does y+ increase after computing?
 
Hi, I would like to know why this happens:
for meshing near the wall, we compute the first node position for y+ = 1 with the java applet http://geolab.larc.nasa.gov/APPS/YPlus/. But, after solving, Fluent reports values of y+ of about 30 or higher at the same point. The flow is compressible (M = 1.1)
I appreciate any explanation.

thecfduser December 14, 2009 17:11

Hi
dear friend, the method that u are using to calculate y+ is bullshit...it does not work...there is no universal method to estimate y+ from Re.
The only way is, to do a simulation with Fluent, get y+, that refine ure mesh as much as u need...

teguhtf December 16, 2009 08:28

Hi,,
To get Y+ in FLUENT is By trial & error. I've tried that equation. and i dosnt work completely.
teguhtf


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