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Old   August 20, 2002, 01:34
Default Axisymmetric Vof
  #1
Turbina
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In 2dd problem Axisymmetric Vof In

- Multhiphase Model 2 components - visosus model k-epsilon 2 eqn standard - standard wall functions

the solver that it doesn't converge the iter continuity

- me from the following mistake:

Error: Internal error at line 743 in file 'amgif.c'. divergence detected in AMG solver Error Object: ()

turbulent viscosity limited to viscosity ratio of 1.000000e+05 in 132 cells.

Thanks for your attention. Bey well,

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Old   August 20, 2002, 07:01
Default Re: Axisymmetric Vof
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CFD MAN
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Hallo What VOF scheme did you use? It should not have any problem to get converged solution. Start with a smaller time step if you do time dependent simulations.

CFD MAN
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Old   August 21, 2002, 01:34
Default Re: Axisymmetric Vof
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Turbina
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Multiphase Model

Geo reconstruct,

Courrant Number 0.25

Thank You
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Old   August 21, 2002, 02:57
Default Re: Axisymmetric Vof
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CFD MAN
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I don't see any reason why it doesn't work.
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Old   August 21, 2002, 07:33
Default Re: Axisymmetric Vof
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Turbina
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Also System 3DD

Real Cilinder Heght 0.2 m Radius 1.45 m

Boudary Condition Wall Face External Cilinder.

GAS Density 1.225 kg/m^3 Voscosity 1.7894e-04 Poise

Melt Density 1187 kg/m^3 Voscosity 2169 Pois

Multiphase Model VOF Geo Costructor Primary Phase GAS Secondary Phase Melt Currant Number 0.25

Viscosus Model K-Epsilon 2 eqn –Standard – Standard Wall Function

Solution Controls - Force Body Weigted – PISO –First Order Upwind

Operation Condition Gravity Y = - 9.81 m/sec^2 Specificed Operatin Density

Boudary Condition Wall Diam = 2.9 m - Rotazional Speed 0.816 Rad / sec Relatyve to Adjacent Cell Zone.

Region Adaption X MIN = -1.45 m X MAX = 1.45

Y MAX = -1.2 YMAX =-1.45

Z MAX = 0 ZMIN = 0.2

Iterate Time Step Size 0.002 – Number of Step 5 – Max Iteration = 10

Continuity no converge
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Old   August 21, 2002, 18:38
Default Re: Axisymmetric Vof
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CFD MAN
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Does it converge in 10 iterations? Whats the convergent criteria?

CFD MAN
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Old   August 22, 2002, 15:16
Default Re: Axisymmetric Vof
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Turbina
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They are the Iteration max for step, but doesn't converge also with Max Iter = 50.

Could question but perhaps depend to type of mesh ?

Thank you
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Old   August 22, 2002, 19:12
Default Re: Axisymmetric Vof
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CFD MAN
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I am pretty sure that its the mesh quality. I have been using VOF with geo for more than 2 years now, I didn't have any major difficulties.

CFD MAN
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Old   August 23, 2002, 14:44
Default Re: Axisymmetric Vof
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Turbina
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Does it know pointing to me a few books that treat any problem of Mesh in turbulent regime? Thank you.
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