CFD Online Logo CFD Online URL
Home > Forums > General Forums > Main CFD Forum

eddy viscosity vs dynamic viscosity??

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

LinkBack Thread Tools Search this Thread Display Modes
Old   August 11, 2014, 03:36
Question eddy viscosity vs dynamic viscosity??
New Member
Join Date: Oct 2010
Location: Malaysia
Posts: 24
Rep Power: 15
alpharays is on a distinguished road
Send a message via Yahoo to alpharays Send a message via Skype™ to alpharays
Hi all,

Anyone know whether eddy viscosity and dynamic viscosity are same or not?

alpharays is offline   Reply With Quote

Old   August 11, 2014, 03:54
New Member
Join Date: Aug 2013
Posts: 19
Rep Power: 12
tarjeiba is on a distinguished road
No, they are definitely not the same. The dynamic viscosity is a macroscopic fluid property ... you can think of it as what distinguishes honey and water. The "eddy viscosity" is a flow property emerging from the increased momentum transport through the flow field due to turbulent velocity fluctuations.

In many turbulence models, the latter is included as an additional viscosity term and it is calculated from local turbulence properties in the flow field. (E.g. in the ubiquitous k-epsilon model, this is expressed \mu_t = C_{\mu} \rho \frac{k^2}{\epsilon}, which is then added to the viscosity term in the averaged momentum equation.)
tarjeiba is offline   Reply With Quote


dynamic, eddy, viscosity

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
Problem with divergence TDK FLUENT 13 December 14, 2018 06:00
Ratio of eddy viscosity to molecular viscosity : Laminar or turbulent flow? JuPa CFX 7 September 9, 2013 07:45
Constant Eddy Viscosity faisal_durr Main CFD Forum 0 February 15, 2012 05:53
Link between eddy viscosity and subgrid-scale turbulent viscosity in LES Marvin Main CFD Forum 6 December 4, 2009 11:08
Bug in Dynamic 1Eq Eddy Viscosity LES Model Incompressible flow harishg OpenFOAM Bugs 5 December 2, 2008 18:18

All times are GMT -4. The time now is 12:18.