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


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

LinkBack Thread Tools Display Modes
Old   April 5, 2010, 04:43
Default turbulence
New Member
Join Date: Apr 2010
Posts: 1
Rep Power: 0
arash_aifoil is on a distinguished road
I have a question about turbulence.
Do any one have info on the variations of turbulent kinetic energy(k) and dissipation rate(epsilon) before and after an obstruction ( like a bridge bracket at water)?

arash_aifoil is offline   Reply With Quote

Old   April 5, 2010, 08:23
Senior Member
Hamid Zoka
Join Date: Nov 2009
Posts: 212
Rep Power: 12
Hamidzoka is on a distinguished road
dear arash
when flow is faced with an obstacle such that disturbances increase, turbulent energy will be increased. tuebulent energy in fact is a fraction of total energy of fluid flow which concerns with flow disturbances.
in the other hand dissipation rate variations is proportional to turbulent energy. once the turbulent energy increases, dissipation rate is also increases. in other words, turbulent kinetic energyis a fraction of total flow energy that is transfered from mean flow to large scales (eddies) of turbulent flow and consequently it is going to be dissipated in small scales (eddies) as "epsilon". so they are completely tied up together.

Hamidzoka 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
Turbulence length scale and integral length scale rizhang CFX 2 April 22, 2016 07:22
Question on Turbulence Intensity Eric FLUENT 1 March 7, 2012 05:30
Discussion: Reason of Turbulence!! Wen Long Main CFD Forum 3 May 15, 2009 09:52
Code release: Flow Transition and Turbulence Chaoqun Liu Main CFD Forum 0 September 26, 2008 17:15

All times are GMT -4. The time now is 20:18.