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Old   October 9, 2008, 22:48
Default Surface Tension and Capillary Flow
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CK
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Hi All is anyone using Flow-3D for surface tension + laminar capillary flow modeling? would like to get some advice on how to speed up simulation time.

Rgds CK
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Old   October 15, 2008, 12:01
Default Re: Surface Tension and Capillary Flow
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AC
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What is limiting the time step? If the surface tension model limits the time step try using the implicit surface tension model.
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Old   October 17, 2008, 01:57
Default Re: Surface Tension and Capillary Flow
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CK
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Hi AC i did switch to implicit surface pressure solver but time step still around 1e-5. Simulation time is slow (16hrs to reach 2s of simulation time, cell count ~300000) even with SMP version running on 4 CPU cores. so, do you deal with this kind of problem before? i'm looking for any inputs/advice to speed up surface tension & capillary flow problem.

Rgds CK
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Old   October 17, 2008, 11:09
Default Re: Surface Tension and Capillary Flow
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AC
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Hi CK, I have ran surface tension dominated simulations before. What pressure solver are you using ? GMRES is the best option for most cases. what limits the time step once you switch to implicit surface tension? Is it viscosity? If yes you can try using implicit viscous solver? Also what version of FLOW-3D are you using ? Regards, AC

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Old   October 18, 2008, 08:28
Default Re: Surface Tension and Capillary Flow
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CK
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Hi AC i'm using setting as below

1. GMRES-implicit-sucessive under-relaxation 2. Surface tension pressure- implicit 3. Advection-Explicit-One fluid,free surface 4. Flow-3D v9.3 SMP with 4 cores.

limiting factor is cx,cy & cz that limit at ~1e-5.

Thus the simulation run slow even with SMP version. So, do you have any good recommendation? Btw, did you used SMP version before? and what is your comments on it?

Rgds CK
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Old   October 18, 2008, 13:40
Default Re: Surface Tension and Capillary Flow
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Michael Barkhudarov
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Hi CK,

Sounds like it is a very small scale problem, no? Is it possible to simplify the problem: coarsen the mesh, reduce the domain, shorten the time?
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Old   October 24, 2008, 01:52
Default Re: Surface Tension and Capillary Flow
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CK
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Michael yes this is small scale problem and i already used half symmetry to cut down the mesh size, anyway it is impossible to increase mesh size larger than 1e-4m in order to capture the surface tension correctly. So, do you work with this kind of problem before? is Flow-3D really good in surface tension model?

Rgds CK
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Old   February 17, 2009, 13:48
Default Re: Surface Tension and Capillary Flow
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Ajayt Thakur
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Dear Sir or Mam

I want to about the experiment of capillarity reaction
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