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

Estimate turbulence dissipation rate (epsilon)

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

LinkBack Thread Tools Display Modes
Old   May 12, 2010, 18:52
Default Estimate turbulence dissipation rate (epsilon)
Join Date: Feb 2010
Posts: 33
Rep Power: 9
blackbody is on a distinguished road
i have to following question:
I want to simulate a hot gas jet exaust of a pipe into a colder freestream
(hot streak in a gasturbine).

What i have from measurement is a 45x45 grid and the data for each node is:

- velocity u
- velocity v
- velocity w
- turbulent kinetic energy
- turbulent intensity [%]
- total pressure
- total temperature

How can I estimate epsilon in order to use the measured turbulence kinetic energy as an Inlet boundary Condition in ANSYS CFX?
The shear of the hot gas with the colder freestream has to be modeled as accurtate as possible...
any suggestions?

Thank you very much!!!
blackbody is offline   Reply With Quote

Old   May 12, 2010, 18:54
Join Date: Feb 2010
Posts: 33
Rep Power: 9
blackbody is on a distinguished road
forgot to say:

x is the streamwise direction and I want to use k as a profile BC for ANSYS CFX. Does epsilon has to be also a profile (for each node different) or can one assume a constant value over the whole inlet?

Thank you
blackbody 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
CFX12 rif errors romance CFX 4 October 26, 2009 14:41
turbulence dissipation rate in DNS Shaohua Wu Main CFD Forum 0 September 16, 2008 23:11
turbulence eddy dissipation rate panneerselvam.R CFX 0 August 25, 2005 04:51
how to decide boundary condition of turbulence energy dissipation rate? Vincent B. Main CFD Forum 5 October 28, 1999 04:07

All times are GMT -4. The time now is 04:42.