Y+ in FLUENT

Mohamed os · May 8, 2006, 15:11

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.

Mohamed os · May 8, 2006, 22:15

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

gholamghar · May 15, 2006, 05:39

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

Avr.Tomer · September 17, 2019, 03:30

Here's my take on wall treatment, including a paragraph on y* (I called it: "Why Star?..." &#128514

:
https://cfdisraelblog.wordpress.com/...-ansys-fluent/

May 8, 2006, 15:11	Y+ in FLUENT	#1
Andrew Guest Posts: n/a	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. Mohamed os likes this.

May 8, 2006, 22:15	Re: Y+ in FLUENT	#2
Tian_FB Guest Posts: n/a	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 Mohamed os likes this.

May 15, 2006, 05:39	Re: Y+ in FLUENT	#3
Ralf Schmidt Guest Posts: n/a	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 gholamghar, abuabdellah.albatal, apohar and 3 others like this.

September 17, 2019, 03:30	*y+ VS. y ---> explained!!**	#4
Avr.Tomer Member Tomer Join Date: Sep 2010 Location: Israel Posts: 39 Blog Entries: 4 Rep Power: 15	Here's my take on wall treatment, including a paragraph on y* (I called it: "Why Star?..." &#128514: https://cfdisraelblog.wordpress.com/...-ansys-fluent/ kuzey likes this.

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