CFD Online Logo CFD Online URL
Home > Forums > OpenFOAM

Molecular viscosity calculation in LES on OpenFOAM

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

LinkBack Thread Tools Display Modes
Old   January 26, 2014, 05:13
Default Molecular viscosity calculation in LES on OpenFOAM
Senior Member
Join Date: Oct 2012
Posts: 286
Rep Power: 6
babakflame is on a distinguished road
Dear Foamers

I am working on a custom-code in OpenFOAM (libOpenSmoke). In this code, I have written the definition of the scalar dissipation rate in LES which includes molecular viscosity. The following is the formulation that I have used: In this formulation, turbulence->mu() refers to molecular viscosity, sigmat refers to laminar Schmidt number and Z is mixture fraction.

chi_st=2 * (turbulence->mu()/(rho*sigmat)) * magSqr(fvc::grad(Z));
I need to know that how does the “molecular viscosity” computes using LES filtering in OpenFOAM?
In literature, typically the filtered molecular viscosity is assumed to be a function of filtered temperature following a power law where the subgrid fluctuations of the temperature are neglected.

Would somebody PLZ hint me that which formulation is used in LES of OpenFOAM for calculating the filtered molecular viscosity?

babakflame is offline   Reply With Quote


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

Similar Threads
Thread Thread Starter Forum Replies Last Post
Non-isothermal incompressible LES in OpenFOAM sagnikmazumdar OpenFOAM Running, Solving & CFD 7 December 5, 2014 17:22
New OpenFOAM Forum Structure jola OpenFOAM 2 October 19, 2011 06:55
Cross-compiling OpenFOAM 1.7.0 on Linux for Windows 32 and 64bits with Mingw-w64 wyldckat OpenFOAM Announcements from Other Sources 3 September 8, 2010 06:25
Modified OpenFOAM Forum Structure and New Mailing-List pete Site News & Announcements 0 June 29, 2009 05:56
subgrid turbulent viscosity for UDF in LES David TAIEB FLUENT 0 April 2, 2007 08:27

All times are GMT -4. The time now is 22:00.