W component of the momentum equation and its validity in 2D simulations

JuPa · April 9, 2014, 13:11

In a "2D simulation" how important is it to achieve satisfactory convergence in the linear solver for the W component of the momentum equation?

In the linear solver if I have an "ok" for the w momentum (as apposed to OK) is this acceptable? Will there be any knock on effects to the u and v components which are more important?

(When you read the momentum equations you can see u, v and w are clearly intertwined! But is the w component able to significantly effect the result if the domain is only one cell thick in the w direction!)

ghorrocks · April 9, 2014, 21:01

It is not very important to get the linear solver to converge on w. So if you have "ok" rather than "OK" then I would not be concerned.

JuPa · April 10, 2014, 05:16

Thanks for the reply.

April 9, 2014, 13:11	W component of the momentum equation and its validity in 2D simulations	#1
JuPa Senior Member Mr CFD Join Date: Jun 2012 Location: Britain Posts: 361 Rep Power: 15	In a "2D simulation" how important is it to achieve satisfactory convergence in the linear solver for the W component of the momentum equation? In the linear solver if I have an "ok" for the w momentum (as apposed to OK) is this acceptable? Will there be any knock on effects to the u and v components which are more important? (When you read the momentum equations you can see u, v and w are clearly intertwined! But is the w component able to significantly effect the result if the domain is only one cell thick in the w direction!)

April 9, 2014, 21:01		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,854 Rep Power: 144	It is not very important to get the linear solver to converge on w. So if you have "ok" rather than "OK" then I would not be concerned. JuPa likes this.

April 10, 2014, 05:16		#3
JuPa Senior Member Mr CFD Join Date: Jun 2012 Location: Britain Posts: 361 Rep Power: 15	Thanks for the reply.