Forum: OpenFOAM Running, Solving & CFD
May 29, 2008, 11:00
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Replies: 64
Views: 7,983
i'm trying turbFoam variant, w
i'm trying turbFoam variant, with div settings for
div(phi,k) and div(phi,epsilon):
div(phi,k) Gauss upwind;
div(phi,epsilon) Gauss upwind;
and it converges (11 iterations), but epsilon...
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Forum: OpenFOAM Running, Solving & CFD
May 29, 2008, 10:16
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Replies: 64
Views: 7,983
I'm running your case, and res
I'm running your case, and results i will obtain tomorrow.
velocity speed 73.9 m/s is for this mesh (convertion factor .0254)?
so, when you was running for convertion factor 1 and 25.4 does you...
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Forum: OpenFOAM Running, Solving & CFD
May 28, 2008, 01:26
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Replies: 64
Views: 7,983
if epsilon is always bounded,
if epsilon is always bounded, than it means, that turbulence model diverges
what formula are u using?
k=1.5*( (I*u_i)**2), I=0.01 (1%)
epsilon=C_mu^0.75*k**(1.5)/l,
l=0.07*D_c (D_c -...
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Forum: OpenFOAM Running, Solving & CFD
May 26, 2008, 10:16
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Replies: 64
Views: 7,983
are you using tet-mesh, or hex
are you using tet-mesh, or hex?
try relaxations factors 0.1 for all variables for the first 100-200 iterations (in simpleFoam)
can you send your case?
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Forum: OpenFOAM Running, Solving & CFD
May 23, 2008, 22:22
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Replies: 64
Views: 7,983
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Forum: OpenFOAM Running, Solving & CFD
May 19, 2008, 05:00
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Replies: 64
Views: 7,983
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Forum: OpenFOAM Running, Solving & CFD
May 14, 2008, 06:57
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Replies: 64
Views: 7,983
1) contents of directory stead
1) contents of directory steady_SAL:
0 - intial values
2 - mesh with refined boundaryLayer
202 - values after 200 iterations with mesh, contained in 2
constant - initial mesh
system -...
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Forum: OpenFOAM Running, Solving & CFD
May 12, 2008, 15:05
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Replies: 64
Views: 7,983
O, i'm sorry, i'm keeping many
O, i'm sorry, i'm keeping many versions at once (to reverse to old, if something goes wrong)
utility is called refineWallLayer
it takes 4 parameters:
case root (.)
case name (.) ...
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Forum: OpenFOAM Running, Solving & CFD
May 8, 2008, 11:02
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Replies: 64
Views: 7,983
Leonardo Nettis, i have conver
Leonardo Nettis, i have converted your mesh, and despite of high skewness at some faces, simpleFoam (steady-state solver) produces stable result with Launder-Sharma k-e model, now, i'm running LES...
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Forum: OpenFOAM Running, Solving & CFD
May 8, 2008, 04:56
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Replies: 64
Views: 7,983
What command line arguments ar
What command line arguments are you using?
I use
plot3dToFoam . . -noBlank raetaf.x.fmt -2D 0.1 -singleBlock -scale 0.333
where 0.1 = 0.1ft (10% of airfoil chord length, which is 1ft, as...
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Forum: OpenFOAM Running, Solving & CFD
May 8, 2008, 03:57
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Replies: 64
Views: 7,983
Yes, LaunderSharma k-epsilon m
Yes, LaunderSharma k-epsilon model is low-Re, but (on my opinion) you have fully-developed turbulent regime (1.0E+6 > 3.0E+5=Re_critical for sphere) and you can use k-epsilon with standard...
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Forum: OpenFOAM Running, Solving & CFD
May 7, 2008, 16:01
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Replies: 64
Views: 7,983
To Philippose Rajan, Leonardo
To Philippose Rajan, Leonardo Nettis:
2 PISO Correctors and 1 or 2 non orthogonal correctors is enough, the more numbers may blow up your calculations.
This correctors is artificial way to...
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Forum: OpenFOAM Running, Solving & CFD
May 7, 2008, 15:56
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Replies: 64
Views: 7,983
Hi Leonardo Nettis,
1) If y
Hi Leonardo Nettis,
1) If your flow is turbulent, you MUST take turblence into account. You must ALSO take in account that fact, that turbulent is ALWAYS 3D and transient (irregular and chaotic)...
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Forum: OpenFOAM Running, Solving & CFD
May 7, 2008, 14:41
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Replies: 64
Views: 7,983
Nishant Singh, can you describ
Nishant Singh, can you describe your case: goals, mesh, boundaries, assumptions...
what turbulence model you are using?
also, please report checkMesh report.
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Forum: OpenFOAM Running, Solving & CFD
May 7, 2008, 11:13
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Replies: 64
Views: 7,983
If you want to use SpalarAlmar
If you want to use SpalarAlmaras 1-eq model, then your y+ should be less then 1 OR greater, then 30,
also, you must check that nu_t/nu in the boundary range lie between 1 and 10 (where nu_t is...
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Forum: OpenFOAM Running, Solving & CFD
May 7, 2008, 11:03
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Replies: 64
Views: 7,983
High aspect ratio cells may ca
High aspect ratio cells may cause serious errors, i think, you must preview this cells. to to that, you must type
foamToVTK . . -cellSet highAspectRatioCells
also, you should not use cells...
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