CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Software User Forums > OpenFOAM

About the nut and nusgs

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

Reply
 
LinkBack Thread Tools Display Modes
Old   April 9, 2018, 23:21
Wink About the nut and nusgs
  #1
New Member
 
Join Date: Aug 2017
Posts: 8
Rep Power: 2
TangYuanzhe is on a distinguished road
Hi

I have a question about the nut and nusgs files in the /0 .
In the Openfoam 2.3.0 ,there is still nusgs file in the 0/.But in the Openfoam 4.0.0,the nusgs file is replaced by nut file.
As I think,the physical meaning of both file is different.
Q:
why nusgs file can be replaced by nut file?Does that mean the boundary condition of both file is same?
TangYuanzhe is offline   Reply With Quote

Old   April 10, 2018, 14:43
Default
  #2
Member
 
Join Date: Aug 2015
Posts: 64
Rep Power: 4
clapointe is on a distinguished road
The way that subgrid scale (SGS) viscosity is treated/named has changed for the newer OF releases. Old versions (eg 2.x) used nuSgs (see eg https://github.com/OpenFOAM/OpenFOAM...es/pitzDaily/0). The newer versions simply refer to the SGS viscosity as nut. Previous OF releases distinguished between nuSgs/muSgs for incompressible/compressible solvers. This is done behind the scenes in newer OF releases. Check out the tutorials for various ways to set boundary conditions for nut.

Caelan
clapointe is offline   Reply With Quote

Reply

Tags
nut nusgs

Thread Tools
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 On
Pingbacks are On
Refbacks are On



All times are GMT -4. The time now is 23:07.