|
[Sponsors] |
May 27, 2006, 14:22 |
question urgent
|
#1 |
Guest
Posts: n/a
|
hi i m simulating gas cyclone with RNG k-e model using hedrahexal mesh. solution converge very fast except epsilon equation and then start to increase i m using default URF any suggestion. 2: what is relation between turbulent and flow equation. if i solve them separately i mean only simulating one of them at a time they both get converge very fast is this solution trust worthy. 3:what URF if i keep URF very low like .1 or .05 what effect it will have and solution will also right with these low urf thanks in advance Anjum
|
|
May 27, 2006, 14:43 |
Re: question urgent
|
#2 |
Guest
Posts: n/a
|
what is urf chankhar
|
|
May 27, 2006, 15:55 |
Re: question urgent
|
#3 |
Guest
Posts: n/a
|
For part 2 of your question, and if you are on steady state, you can solve each of the equations (turbulence or flow) one at a time. This is when you first solve the flow, then turn the flow off, solve turbulence while flow is off, and finally, solve them together (some recommend that you use 2nd order discretization when you solve them together finally.
As for URF's, when they are low, the residues normally avoid instabilities and meanwhile, it takes longer time that the solution converge or residuals fall several orders of magnitude. Also try to use convergence indicators like mass or energy conservation (flux reports). Check Fluent guide for judging convergence in "using the solver section". Cheers, Amr |
|
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
question about uds | tanven | FLUENT | 2 | July 5, 2015 11:22 |
[GAMBIT] URGENT!!! "Import from GAMBIT to ANSYS-12.1 (Design Modeler/Geometry)" | MDinc | ANSYS Meshing & Geometry | 13 | September 13, 2012 09:26 |
URGENT!!! "Import from GAMBIT to ANSYS-12.1 (Design Modeler/Geometry)" | MDinc | FLUENT | 1 | November 24, 2010 01:59 |
Question about Table applicaiton. | universez | OpenFOAM Running, Solving & CFD | 0 | January 12, 2010 20:31 |
Poisson Solver question | Suresh | Main CFD Forum | 3 | August 12, 2005 04:37 |