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Old   August 31, 2008, 12:05
Default Meshing
  #1
pukiwawa
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Is this mesh consider a good mesh???

http://www.imageno.com/r0ke36nqeccwpic.html

I read this msh file in fluent and when i start to iterate with k-w models. A message "turbulent viscosity limited to viscosity ratio of 1.000000e+005 in 191 cells"

I know the problem has something to do with my mesh. How to know where do the cells jump occur? How to check?

Waiting for reply
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Old   September 1, 2008, 02:28
Default Re: Meshing
  #2
solver-issues
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sounds good enough mesh to me,

intiate with k = 0.0001 and omega = 10

and you will not see that warning if the mesh is okey.

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Old   September 1, 2008, 04:10
Default Re: Meshing
  #3
pukiwawa
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What does the K and omega means?
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Old   September 1, 2008, 04:39
Default Re: Meshing
  #4
solver-issues
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turbulence model's k and w.

You were using k-w model, remember.
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Old   September 1, 2008, 04:40
Default Re: Meshing
  #5
pukiwawa
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I know that's k-w turbulent model.

But I wish to know the meaning if possible. usually i set w and w =1 which are by default
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Old   September 1, 2008, 04:52
Default Re: Meshing
  #6
pukiwawa
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Do I still need to use k-w model even the Re is below 5 X 10^5?
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Old   September 1, 2008, 05:16
Default Re: Meshing
  #7
pukiwawa
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Do I still need to use k-w model even the Re is below 5 X 10^5?
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Old   September 1, 2008, 05:21
Default Re: Meshing
  #8
solver-issues
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using or not using turbulence model is what you got to decide. I think in your situtation i would be using turbulence model. SST KW is good choice generally.

What i suggested you was that default initialization could start this warning, but if you initialize differently and if solve convergence you will not see this warning. I usuallyt initialize with these values and have not got this warning.
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Old   September 1, 2008, 10:38
Default Re: Meshing
  #9
sk vashisth
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I am not able devlop geomitry for mixed flow pump since it is too complex. what approach should i adopt.can i get cad geomitry or msh file for waterjet propulsion or at least mixed flow pump
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Old   September 6, 2008, 06:45
Default Re: Meshing
  #10
Rajesh
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Hi pukiwawa,

You can try smooth/swap options to increase the mesh quality. Increase the number of iterations to smooth the mesh.
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