CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Main CFD Forum

How to compute the total viscous energy loss from 3D velocity flow field ?

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

Reply
 
LinkBack Thread Tools Display Modes
Old   August 20, 2014, 12:35
Default How to compute the total viscous energy loss from 3D velocity flow field ?
  #1
New Member
 
Mohammed ElBaz
Join Date: Aug 2014
Posts: 2
Rep Power: 0
msmmelbaz is on a distinguished road
I am trying to compute the total energy viscous energy loss of the left ventricle . The velocity data is 3D velocity field acquired using 4D Flow MRI. I am wondering, when computing the cumulative energy loss should I sum the absolute (i.e. unsigned or non negative) values of the individual measurements or the signed ones?

To compute the energy loss of every point I use the following function:

E_loss=(S-(div(v)/3)*delta), where S is the strain rate tensor and delta is the Kronecker delta

Thanks in advance
msmmelbaz is offline   Reply With Quote

Old   August 21, 2014, 03:54
Default
  #2
New Member
 
Mohammed ElBaz
Join Date: Aug 2014
Posts: 2
Rep Power: 0
msmmelbaz is on a distinguished road
I would like to clarify my question more.
I do understand the point that divergence has to be signed. My question is about getting the total E-loss over all points in the domain of interest (In my case, Left ventricle ) i.e. when summing up the E-loss of all (x,y,z) mesh points should I sum the signed or unsigned E-loss? On other words, does negative E-loss represent something?
msmmelbaz is offline   Reply With Quote

Reply

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
Weird Velocity Field for Capillary Flow in a Horizontal Tube mashimaro_star Fluent Multiphase 1 December 15, 2014 06:34
change velocity field LM4112 OpenFOAM Running, Solving & CFD 12 February 5, 2014 12:56
velocity of massless particles and velocity of flow field in same coordinate payam_IUST FLUENT 0 October 18, 2009 23:24
flow simulation across a small fan jane luo Main CFD Forum 15 April 12, 2004 17:49
Why FVM for high-Re flows? Zhong Lei Main CFD Forum 23 May 14, 1999 13:22


All times are GMT -4. The time now is 10:55.