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Showing results 1 to 11 of 11 Search took 0.00 seconds. Search: Posts Made By: truong_nm

Forum: OpenFOAM Running, Solving & CFD May 19, 2010, 14:16

Replies: 28 OF Compressible equations SIMPLE/PISO Views: 14,055 Posted By truong_nm I made some investigations and I think that I... I made some investigations and I think that I will keep rhoPisoFoam + SLTS. This duo gives me the best convergence/accuracy/speed.

Forum: OpenFOAM Running, Solving & CFD May 18, 2010, 10:40

Replies: 28 OF Compressible equations SIMPLE/PISO Views: 14,055 Posted By truong_nm Basically, this option appears in the source code... Basically, this option appears in the source code of the solvers (rhoSimple, rhoPimple or rhoPiso) [transonic is actually a boolean and its default value is false]. After reading the source code and...

Forum: OpenFOAM Running, Solving & CFD May 18, 2010, 10:06

Replies: 28 OF Compressible equations SIMPLE/PISO Views: 14,055 Posted By truong_nm rhoPisoFoam + SLTS local time step technique... rhoPisoFoam + SLTS local time step technique works very well. But with rhoPimpleFoam, density increases dramatically (relaxation factor at .05 as you suggested) and the computation finally crashes....

Forum: OpenFOAM Running, Solving & CFD May 18, 2010, 03:42

Replies: 28 OF Compressible equations SIMPLE/PISO Views: 14,055 Posted By truong_nm I tried another setup: rhoPisoFoam + local time... I tried another setup: rhoPisoFoam + local time in order to reproduce pseudo-transient computations that can be found in paying CFD softs. It seems that computations run :o Do you think this...

Forum: OpenFOAM Running, Solving & CFD May 17, 2010, 10:34

Replies: 28 OF Compressible equations SIMPLE/PISO Views: 14,055 Posted By truong_nm This is what happened: 1. Following your advice... This is what happened: 1. Following your advice for relaxation factors and keywords in the SIMPLE sub-dictionary, the computation crashes quite immediately. 2. When I add the 'transonic' keyword,...

Forum: OpenFOAM Running, Solving & CFD May 17, 2010, 09:40

Replies: 28 OF Compressible equations SIMPLE/PISO Views: 14,055 Posted By truong_nm Thanks Alberto, I'll do what you recommend and... Thanks Alberto, I'll do what you recommend and I'll let you know :o

Forum: OpenFOAM Running, Solving & CFD April 24, 2010, 11:33

Replies: 28 OF Compressible equations SIMPLE/PISO Views: 14,055 Posted By truong_nm Any idea ? I succeeded in running my cases with... Any idea ? I succeeded in running my cases with sonicFoam, rhoPisoFoam and rhoPimpleFoam with their own settings. But still failed with rhoSimpleFoam. Case: Mach .6 on 2D Airfoil RAE2822 U:...

Forum: OpenFOAM Running, Solving & CFD April 19, 2010, 14:59

Replies: 28 OF Compressible equations SIMPLE/PISO Views: 14,055 Posted By truong_nm My case(s) is(are): 2D Airfoil RAE2822 Mach... My case(s) is(are): 2D Airfoil RAE2822 Mach .75, non-zero angle of attack (when 'transonic' boolean is true, Mach .6 otherwise, Reynolds about 6M) Turbulence model: Spalart Allmaras.

Forum: OpenFOAM Running, Solving & CFD April 19, 2010, 10:49

Replies: 28 OF Compressible equations SIMPLE/PISO Views: 14,055 Posted By truong_nm Well, thanks for your reply. I took a look at the... Well, thanks for your reply. I took a look at the code for rhoCentralFoam. To me, Kurganov and Tadmor are designed for hyperpolic equations, i.e. Euler equations. Moreover, when I read the code,...

Forum: OpenFOAM Running, Solving & CFD April 19, 2010, 05:29

Replies: 28 OF Compressible equations SIMPLE/PISO Views: 14,055 Posted By truong_nm Thanks for your reply Alberto, I will certainly... Thanks for your reply Alberto, I will certainly take a look at the reference. I went on my investigations. I saw that both solvers you mentioned are Euler solvers ? I need NS Solvers beause I want...

Forum: OpenFOAM Running, Solving & CFD April 17, 2010, 12:41

Replies: 28 OF Compressible equations SIMPLE/PISO Views: 14,055 Posted By truong_nm OF Compressible equations SIMPLE/PISO Dear Foamers, I am currently investigating on OF abilities with compressible flows. Basically, three cases: strictly subsonic flow (Mach .6) then shockwave (Mah .725, .75) on an airfoil. In order...

Showing results 1 to 11 of 11

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