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Y+ in FLUENT

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Old   May 8, 2006, 15:11
Default Y+ in FLUENT
  #1
Andrew
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My question is actually about FLUENT. Does anyone know how to check, define, or control Y+ in FLUENT ?

Appreciate it. ~Andrew

----- PS. sorry about confussion.
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Old   May 8, 2006, 22:15
Default Re: Y+ in FLUENT
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Tian_FB
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Dear Andrew, Well,Y+=yv*/ν,v*=(τw/&rho^0.5,τw is the shearing force on boundary,ν is the kinematical viscosity,ρ is the density of fluid.In fluent,y is the first layer grid around boundary,i.e. if the hight of the grid around the boundary is L, the Y+=Lv*/ν.So ,I think you can change the size of grid around boundary ,or equilibrium grid (a commond in fluent). I think if you had read some books about the turbulence boundary layer,you may now the exactly means of y+ and why and how we control the magnitude of it.

Cheers, Tian

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Old   May 15, 2006, 05:39
Default Re: Y+ in FLUENT
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Ralf Schmidt
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please use the FLUENT forum for fluent questions!!

Check y+: use: xy plot -> turbulence -> yplus, the surface is the wall of your geometry

control y+: adapt-> yplus

Hope, it helps. Ralf
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Old   September 17, 2019, 03:30
Lightbulb y+ VS. y* ---> explained!!
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Tomer
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Here's my take on wall treatment, including a paragraph on y* (I called it: "Why Star?..." &#128514:
https://cfdisraelblog.wordpress.com/...-ansys-fluent/
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