|
[Sponsors] |
How can check the eddy viscosity at the wall with LES |
|
LinkBack | Thread Tools | Search this Thread | Display Modes |
August 14, 2015, 02:21 |
How can check the eddy viscosity at the wall with LES
|
#1 |
New Member
Sungjin Won
Join Date: Dec 2012
Location: Seoul/Republic of Korea
Posts: 15
Rep Power: 13 |
Hi, I checked my code based on 3D turbulent channel flow model (Re_tau=180).
Staggered grid which contains eddy viscosity at the center of grid is used. Due to the properties are placed on the grid center, I confused about checking the properties of eddy viscosity at the wall. When I plot the time averaged eddy viscosity data, the tendency doesn't look like going to zero. The data starts from y+ = 0.583690705381331. Thanks in advance. |
|
August 14, 2015, 07:57 |
|
#2 |
Senior Member
Filippo Maria Denaro
Join Date: Jul 2010
Posts: 6,768
Rep Power: 71 |
The static Smagorinsky eddy viscosity model cannot give zero at wall...
Usually, a dumping function is supplied |
|
August 16, 2015, 04:38 |
|
#3 | |
New Member
Sungjin Won
Join Date: Dec 2012
Location: Seoul/Republic of Korea
Posts: 15
Rep Power: 13 |
Quote:
As you said, static Smagorinsky eddy viscosity cannot give zero at wall. But when if I wanna check the dynamic eddy viscosity, is there a way to check it? |
||
August 16, 2015, 04:47 |
|
#4 |
Senior Member
Filippo Maria Denaro
Join Date: Jul 2010
Posts: 6,768
Rep Power: 71 |
in the dynamic procedure, the eddy viscosity function must go to zero at a wall, you can check by looking to the vertical profiles as you did in the previous figure
|
|
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Divergence in AMG solver! | marina | FLUENT | 20 | August 1, 2020 11:30 |
Problem with divergence | TDK | FLUENT | 13 | December 14, 2018 06:00 |
Wall modeling in LES | chivaee | Main CFD Forum | 1 | May 31, 2012 15:34 |
Constant Eddy Viscosity | faisal_durr | Main CFD Forum | 0 | February 15, 2012 05:53 |
Multicomponent fluid | Andrea | CFX | 2 | October 11, 2004 05:12 |