|December 18, 2012, 06:47||
Segregated vs Coupled Solver
Join Date: Dec 2012
Posts: 33Rep Power: 5
If I am running a simulation should I be able to switch between these two solvers with little difference.
Currently I am trying to simulate a turbine blade and when I run the simulation in Segregated mode it runs fine (with constant density also) but when I change the solved to Coupled (with ideal gas) it no longer works and never converges and gives a really unstable solution that is continuously changing.
Does anyone know what I could be doing wrong?
|December 23, 2012, 23:53||
Join Date: Apr 2011
Location: Orlando, FL USA
Posts: 1,291Rep Power: 20
The coupled solver is generally more unstable. In terms of stability
constant density segregated > ideal gas segregated > ideal gas coupled
|December 25, 2012, 12:38||
siamak rahimi ardkapan
Join Date: Jul 2010
Location: Copenhagen, Denmark
Posts: 218Rep Power: 10
When you use coupled flow, the software uses coupled equations to solve pressure and velocity. This is proper when you have high density, or high Mach. It will use more CPU and it will converge slowly but the result will be more accurate. when you use the segregated, then the segregated equations. It is proper for standard case, when there is no complicated physical conditions. It uses less CPU and it will converge faster.
|coupled, segregated, solver, turbine|
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