iteration

ahmedsh974 · July 16, 2013, 18:39

if i have one phase flow 500 iteration 7 min
if i have two phase flow (VOF) MODEL 500 iteration 3 hour
any help me please
thanks

Jim87 · July 17, 2013, 05:04

In general it is hard to say why there is such a big difference between both cases. We are talking about Fluent, right?

VOF models can be very complicated (with phase interaction solidification....)

Maybe you should proove you application, but a convenient act could be to discuss your final residuals and the evolution of them. If you have good residuals after 100 Iterations and the folowing 400 don't do a lot, you could stop your simulation at 100 iterations.

A big influence is also the setting of under relaxation factors in the solution controls.

P.S: I would write your next question in the CFX or Fluent sup-Forums.

ahmedsh974 · July 18, 2013, 18:34

thanks Jim87
yes i use fluent , i have two phase flow ( oil and water ) through in horizontal pipe ( d=0.508 m , l = 10 m ) stratified flow , i want compute pressure gradient , but i want applied pipe material (steel) effect on flow i select VOF .
MY PROBLEM
i don't no if my working is true or not
thanks

July 16, 2013, 18:39	iteration	#1
ahmedsh974 New Member ahmed ibraheem Join Date: Jun 2013 Posts: 12 Rep Power: 13	if i have one phase flow 500 iteration 7 min if i have two phase flow (VOF) MODEL 500 iteration 3 hour any help me please thanks

July 17, 2013, 05:04		#2
Jim87 Member Stephan Langenberg Join Date: Sep 2011 Location: Germany Posts: 73 Rep Power: 15	In general it is hard to say why there is such a big difference between both cases. We are talking about Fluent, right? VOF models can be very complicated (with phase interaction solidification....) Maybe you should proove you application, but a convenient act could be to discuss your final residuals and the evolution of them. If you have good residuals after 100 Iterations and the folowing 400 don't do a lot, you could stop your simulation at 100 iterations. A big influence is also the setting of under relaxation factors in the solution controls. P.S: I would write your next question in the CFX or Fluent sup-Forums. ahmedsh974 likes this.

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July 18, 2013, 18:34		#3
ahmedsh974 New Member ahmed ibraheem Join Date: Jun 2013 Posts: 12 Rep Power: 13	thanks Jim87 yes i use fluent , i have two phase flow ( oil and water ) through in horizontal pipe ( d=0.508 m , l = 10 m ) stratified flow , i want compute pressure gradient , but i want applied pipe material (steel) effect on flow i select VOF . MY PROBLEM i don't no if my working is true or not thanks