CFD Theory confusion

sur4j · September 25, 2013, 17:18

Hello,

I am trying to learn the theory behind CFD and have been watching the following lectures:

http://www.youtube.com/watch?v=nPSJxmICStA

The lecturer is deriving the Navier Stokes Equations and I have gotten confused with one of his methods.

Could somebody please explain to me what is happening at 44:30 when he rearranges the variables for the isotropic conditions.

Thank you.

FMDenaro · September 25, 2013, 18:07

The topic is very standard in the basic course of fluid mechanics you can find all details in many textbook starting from the hystorical book of Batchelor up to more recent of Kundu. Then, isotropy is useful to further link the stress tensor to the velocity gradient by means of the linear Newtonian assumption.
I suggest to study first details on a book

September 25, 2013, 17:18	CFD Theory confusion	#1
sur4j Member Join Date: Aug 2013 Posts: 60 Rep Power: 13	Hello, I am trying to learn the theory behind CFD and have been watching the following lectures: http://www.youtube.com/watch?v=nPSJxmICStA The lecturer is deriving the Navier Stokes Equations and I have gotten confused with one of his methods. Could somebody please explain to me what is happening at 44:30 when he rearranges the variables for the isotropic conditions. Thank you.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
CFD Meshing Theory. Where can I read something more???	Stabum	Main CFD Forum	4	October 26, 2012 07:48
ASME CFD Symposium, Atlanta, July 2001	Chris R. Kleijn	Main CFD Forum	0	September 13, 2000 05:48
ASME CFD Symposium, Atlanta, July 2001	Chris R. Kleijn	Main CFD Forum	0	August 21, 2000 05:49
PC vs. Workstation	Tim Franke	Main CFD Forum	5	September 29, 1999 16:01
Which is better to develop in-house CFD code or to buy a available CFD package.	Tareq Al-shaalan	Main CFD Forum	10	June 13, 1999 00:27

September 25, 2013, 18:07		#2
FMDenaro Senior Member Filippo Maria Denaro Join Date: Jul 2010 Posts: 6,849 Rep Power: 73	The topic is very standard in the basic course of fluid mechanics you can find all details in many textbook starting from the hystorical book of Batchelor up to more recent of Kundu. Then, isotropy is useful to further link the stress tensor to the velocity gradient by means of the linear Newtonian assumption. I suggest to study first details on a book