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Showing results 1 to 15 of 15 Search took 0.00 seconds. Search: Posts Made By: alberto

Forum: OpenFOAM Running, Solving & CFD February 17, 2011, 17:08

Replies: 44 Pressure instability with rhoSimpleFoam Views: 26,386 Posted By alberto Hi, yes they do not have the porous zone... Hi, yes they do not have the porous zone implemented, but adding it should be easy, even if it means modifying a solver. Anyway, my suggestion was mainly to understand what is going on. The BC can...

Forum: OpenFOAM Running, Solving & CFD February 17, 2011, 15:00

Replies: 44 Pressure instability with rhoSimpleFoam Views: 26,386 Posted By alberto My bad. It seems nUCorrectors is used in porous... My bad. It seems nUCorrectors is used in porous solvers. Sorry for the confusion! nCorrectors is for PISO and PIMPLE, and they have a different role there.

Forum: OpenFOAM Running, Solving & CFD February 17, 2011, 02:34

Replies: 44 Pressure instability with rhoSimpleFoam Views: 26,386 Posted By alberto There seem to be no problem with the mesh, so I... There seem to be no problem with the mesh, so I would simply turn on the porous zone, and consider the actual flow conditions. You are going to have a sort of wave reflection at the outlet I...

Forum: OpenFOAM Running, Solving & CFD February 16, 2011, 17:19

Replies: 44 Pressure instability with rhoSimpleFoam Views: 26,386 Posted By alberto Hi, in Patty's case the mesh seems OK. I run the... Hi, in Patty's case the mesh seems OK. I run the for a while, and the solution is smooth. Instabilities originate from the outlet (meaning they probably depend on some physical element not set...

Forum: OpenFOAM Running, Solving & CFD February 16, 2011, 16:34

Replies: 44 Pressure instability with rhoSimpleFoam Views: 26,386 Posted By alberto The instability seems induced by the outlet... The instability seems induced by the outlet condition. Check it. The under-relaxation factors do not make much sense to me. You relax way too much the pressure, and way too little the density....

Forum: OpenFOAM Running, Solving & CFD February 16, 2011, 14:54

Replies: 44 Pressure instability with rhoSimpleFoam Views: 26,386 Posted By alberto Yes, but that only applies if you use... Yes, but that only applies if you use reconCentral scheme, at least in my understanding. Anyway, if you find something, please let us know! :-)

Forum: OpenFOAM Running, Solving & CFD February 16, 2011, 14:30

Replies: 44 Pressure instability with rhoSimpleFoam Views: 26,386 Posted By alberto It seems you are using a very standard numerics,... It seems you are using a very standard numerics, which would indicate problems in 1.7.1 that are not in 1.6-ext. Do you know what was the difference causing convergence problems? Best, Alberto

Forum: OpenFOAM Running, Solving & CFD February 13, 2011, 16:45

Replies: 44 Pressure instability with rhoSimpleFoam Views: 26,386 Posted By alberto OK. A small complete case reproducing... OK. A small complete case reproducing the problem would help. If not that, at least the numerical setup and the boundary conditions you use. If these are fine, your problem might be the mesh...

Forum: OpenFOAM Running, Solving & CFD February 12, 2011, 15:42

Replies: 44 Pressure instability with rhoSimpleFoam Views: 26,386 Posted By alberto I believe it is not appropriate to relax so... I believe it is not appropriate to relax so strongly the pressure. If you need to do that, most probably you have a problem in your physical or numerical setup. Could you post a simple case that...

Forum: OpenFOAM Running, Solving & CFD December 27, 2010, 16:12

Replies: 44 Pressure instability with rhoSimpleFoam Views: 26,386 Posted By alberto You can quickly adapt the cases for rhoPimpleFoam... You can quickly adapt the cases for rhoPimpleFoam and rhoPorousSimpleFoam to rhoSimpleFoam. I added the required entries to the attached case, but I did not clean the dictionaries up.

Forum: OpenFOAM Running, Solving & CFD December 27, 2010, 13:34

Replies: 44 Pressure instability with rhoSimpleFoam Views: 26,386 Posted By alberto Take a look at the tutorials :-) Take a look at the tutorials :-)

Forum: OpenFOAM Running, Solving & CFD December 27, 2010, 13:04

Replies: 44 Pressure instability with rhoSimpleFoam Views: 26,386 Posted By alberto rhoSimpleFoam is the only compressible steady... rhoSimpleFoam is the only compressible steady solver available. There is rhoCentralFoam, which is suitable for viscid/inviscid flows with high Mach number, but it is unsteady. Similarly,...

Forum: OpenFOAM Running, Solving & CFD December 27, 2010, 03:50

Replies: 44 Pressure instability with rhoSimpleFoam Views: 26,386 Posted By alberto rhoSimpleFoam is part of OpenFOAM 1.7.1 rhoSimpleFoam is part of OpenFOAM 1.7.1

Forum: OpenFOAM Running, Solving & CFD December 5, 2010, 23:03

Replies: 44 Pressure instability with rhoSimpleFoam Views: 26,386 Posted By alberto Oh, I guess this is due to the forum migration. Oh, I guess this is due to the forum migration.

Forum: OpenFOAM Running, Solving & CFD December 5, 2010, 17:05

Replies: 44 Pressure instability with rhoSimpleFoam Views: 26,386 Posted By alberto Hi, the last comment before yours is from 2006.... Hi, the last comment before yours is from 2006. It is probably more convenient if you open a new thread, and maybe provide a sample case that reproduces the problem. Best,

Showing results 1 to 15 of 15

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