CFD Online Logo CFD Online URL
Home > Forums > Software User Forums > OpenFOAM

Temperature gradient using wall-functions

Register Blogs Members List Search Today's Posts Mark Forums Read

LinkBack Thread Tools Search this Thread Display Modes
Old   February 7, 2011, 16:38
Default Temperature gradient using wall-functions
New Member
Andreas Schwärzle
Join Date: Sep 2010
Posts: 6
Rep Power: 15
chantre is on a distinguished road
I am calculating a channel flow including heat transfer. I'm using the k-epsilon model and pisoFoam solver. Since the flow is incompressible, I added the temperature energy equation to the solver, similar to the following link:

The mesh I use is a high-Re mesh, and therefore I have to use wall-functions.
To calculate the heat flux at the wall (constant temperature) I need the temperature gradient at the wall.
Now the question: Is there a (relatively) simple approach in calculating the this temperature gradient using the wall function equations? (something similar to the tool wallShearStress)
I think a similar tool within Fluent would be the wall function heat transfer coefficient.

To compare: the wallShearStress tool gives good results concerning the shear stress, while calculating the shear stress using the wallGradU-tool gives far too small values

Thanks a lot for your help
chantre is offline   Reply With Quote

Old   February 9, 2019, 03:27
Senior Member
Hojatollah Gholami
Join Date: Jan 2019
Posts: 171
Rep Power: 7
Hgholami is on a distinguished road
Dear Andreas
Did you find solution for this problem? I also want to calculate heat flux of a wall in OF-ext4.0, I use wallGradT.C in and compile successfully. But when I want to use that in controlDict with bellow code, that give error
type wallGradT;
functionObjectLibs ("");
enabled true;
outputControl outputTime;
patches (top bottom);
if you find any solution, please favor me.

Last edited by Hgholami; February 9, 2019 at 07:43.
Hgholami is offline   Reply With Quote

Old   July 19, 2021, 07:56
New Member
Join Date: Nov 2018
Posts: 4
Rep Power: 7
micheall is on a distinguished road
just type wallGradT in terminal at the end of simulation.
micheall is offline   Reply With Quote


gradient, heat flux, heat transfer, k-epsilon, wall functions

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
Calculation of the Governing Equations Mihail CFX 7 September 7, 2014 06:27
sharp temperature decrease near the wall dace CFX 0 January 28, 2009 08:23
Gradient over interior (shadow) wall D Krijgsman FLUENT 0 August 21, 2008 00:44
adjust gradient temperature on the cylinder's wall Konrad FLUENT 1 August 28, 2006 07:16
Wall functions? Pr Main CFD Forum 7 April 8, 2004 06:15

All times are GMT -4. The time now is 18:38.