Advance/Speed up time stepping in SIMPLE alogrithm

mhdali101 · August 29, 2015, 15:49

Hi,

I am using time stepping SIMPLE algorithm to solve steady state problems which takes a lot of time step to converge to steady state.
How can i advance or Speed up time stepping while solving Navier-Stokes equation using simple algorithm to solve steady state problem.

Thanks.

tas38 · August 29, 2015, 23:43

Tweaks on the SIMPLE algorithm, such as SIMPLEC, SIMPLER, etc., specifically attempt to decrease the total number of iterations (can get away with larger relaxation factors) through more accurate velocity correction computations per iteration.

mhdali101 · August 30, 2015, 02:00

Thanks for the reply.
Can you suggest any algorithm which solve NSE without any time stepping (discard transient term). Is Fluent steady state solver, uses above tweaks or they completely discarding transient term.

tas38 · August 30, 2015, 15:05

Fluent employs SIMPLE by default for steady-state flows but SIMPLEC is also available. Both algorithms disregard the transient terms.

LuckyTran · September 1, 2015, 18:08

Quote:

Originally Posted by mhdali101

Thanks for the reply.
Can you suggest any algorithm which solve NSE without any time stepping (discard transient term). Is Fluent steady state solver, uses above tweaks or they completely discarding transient term.

If you're trying to solve a statinoary problem, use the Fluent steady state solver, it is a bona-fide steady-state solver without a transient term.

August 29, 2015, 15:49	Advance/Speed up time stepping in SIMPLE alogrithm	#1
mhdali101 New Member mohamed ali Join Date: Nov 2013 Posts: 4 Rep Power: 12	Hi, I am using time stepping SIMPLE algorithm to solve steady state problems which takes a lot of time step to converge to steady state. How can i advance or Speed up time stepping while solving Navier-Stokes equation using simple algorithm to solve steady state problem. Thanks.

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August 29, 2015, 23:43		#2
tas38 Senior Member Troy Snyder Join Date: Jul 2009 Location: Akron, OH Posts: 220 Rep Power: 19	Tweaks on the SIMPLE algorithm, such as SIMPLEC, SIMPLER, etc., specifically attempt to decrease the total number of iterations (can get away with larger relaxation factors) through more accurate velocity correction computations per iteration.

August 30, 2015, 02:00		#3
mhdali101 New Member mohamed ali Join Date: Nov 2013 Posts: 4 Rep Power: 12	Thanks for the reply. Can you suggest any algorithm which solve NSE without any time stepping (discard transient term). Is Fluent steady state solver, uses above tweaks or they completely discarding transient term.

August 30, 2015, 15:05		#4
tas38 Senior Member Troy Snyder Join Date: Jul 2009 Location: Akron, OH Posts: 220 Rep Power: 19	Fluent employs SIMPLE by default for steady-state flows but SIMPLEC is also available. Both algorithms disregard the transient terms.