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

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

 August 20, 2014, 12:35 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 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

 August 21, 2014, 03:54 #2 New Member   Mohammed ElBaz Join Date: Aug 2014 Posts: 2 Rep Power: 0 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?

 Thread Tools Display Modes Linear Mode

 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 OffTrackbacks are On Pingbacks are On Refbacks are On Forum Rules

 Similar Threads Thread Thread Starter Forum Replies Last Post mashimaro_star Fluent Multiphase 1 December 15, 2014 06:34 LM4112 OpenFOAM Running, Solving & CFD 12 February 5, 2014 12:56 payam_IUST FLUENT 0 October 18, 2009 23:24 jane luo Main CFD Forum 15 April 12, 2004 17:49 Zhong Lei Main CFD Forum 23 May 14, 1999 13:22

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