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

entropy generation rate -VS- system pressure drop

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

LinkBack Thread Tools Display Modes
Old   October 25, 2010, 13:45
Question entropy generation rate -VS- system pressure drop
New Member
Join Date: Feb 2010
Posts: 3
Rep Power: 9
JBL is on a distinguished road
Hey everyone,

I ran an internal flow simulation (steady state, SST k-omega, no heat transfer) and it's time for post-processing.

I'd like to identify the areas that create most losses and I thought of calculating the local entropy generation rate using mean velocity derivative components.

My problem is: I'm not quite sure if the turbulent behavior of the flow is captured when using this technique with a k-omega model.

If I compare these 2 quantities:
(1) Temp(K)xDensity(kg/m3)xvol_integral[local_S_gen_rate](W.m3/kg.K)
(2) Flowrate(m3/s)*Tot_DP(Pa)
I would expect them to be the same. They don't seem to be in my case (not even close!). Is it due to the fact that I calculate the Entropy using averaged velocity components?

Could anyone clarify for me the link between total pressure drop and entropy generation rate? Any sugggestion for post processing internal flow?

Thanks in advance!
JBL 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
Calculation of the Governing Equations Mihail CFX 7 September 7, 2014 06:27
Pressure drop? Munni FLUENT 4 March 25, 2010 15:21
Constant pressure drop condition Jonny6001 FLUENT 0 December 19, 2009 08:36
Pressure Drop at entrance of a rotor-stator. Resnick Main CFD Forum 0 November 20, 2007 15:50
Hydrostatic pressure in 2-phase flow modeling (CFX4.2) HB &DS CFX 0 January 9, 2000 14:19

All times are GMT -4. The time now is 08:38.