calculating first layer wall thickness

tricha122 · February 15, 2018, 14:38

Hi,

I am trying to calculate y* during the fluent solution within a UDF. From what I can tell from the available cell / face variables, I can retrieve the turbulent kinetic energy (Kp), and then using this and the cell center height (Yp) I can calculate y*.

turbulent kinetic energy can be retrieved with F_K(f,tf)

How can I retrieve the height of the cell adjacent to the wall? certainly this has to be available as it uses it to evaluate the wall function

Any help would be greatly appreciated!

Thanks!

LuckyTran · February 15, 2018, 14:57

What version of Fluent are you using????? Depending on the version you might be able to use:

C_WALL_DIST
Calc_Cell_Wall_Distance_New
Calc_Cell_Wall_Distance_Alternative

Check out this thread:

tricha122 · February 15, 2018, 15:09

I am using Fluent 18.2

is there documentation for C_WALL_DIST?

otherwise I guess I could get the centroid of the face, centroid of the cell, and get the length of the vector between them

February 15, 2018, 14:38	calculating first layer wall thickness	#1
tricha122 Member Tyler Richardson Join Date: Jun 2017 Posts: 30 Rep Power: 8	Hi, I am trying to calculate y* during the fluent solution within a UDF. From what I can tell from the available cell / face variables, I can retrieve the turbulent kinetic energy (Kp), and then using this and the cell center height (Yp) I can calculate y*. turbulent kinetic energy can be retrieved with F_K(f,tf) How can I retrieve the height of the cell adjacent to the wall? certainly this has to be available as it uses it to evaluate the wall function Any help would be greatly appreciated! Thanks!

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February 15, 2018, 14:57		#2
LuckyTran Senior Member Lucky Join Date: Apr 2011 Location: Orlando, FL USA Posts: 5,676 Rep Power: 66	What version of Fluent are you using????? Depending on the version you might be able to use: C_WALL_DIST Calc_Cell_Wall_Distance_New Calc_Cell_Wall_Distance_Alternative Check out this thread:

February 15, 2018, 15:09		#3
tricha122 Member Tyler Richardson Join Date: Jun 2017 Posts: 30 Rep Power: 8	I am using Fluent 18.2 is there documentation for C_WALL_DIST? otherwise I guess I could get the centroid of the face, centroid of the cell, and get the length of the vector between them