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Gravity option in Fluent?

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Old   August 7, 2003, 14:19
Default Gravity option in Fluent?
  #1
Suresh
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Have anyone of you worked on gravity influence on flow of fluids with no heat transfer involved?

I am able to see a hydrostatic pressure gradient only when I turn on the specific operating density and change the value to zero.

I would appreciate if you could give some tips on what discretization schemes I should use.

Thanks, Suresh
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Old   August 19, 2003, 03:01
Default Re: Gravity option in Fluent?
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kim
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If you use VOF of multiphase problem, you can use body weighted discretization schemes
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Old   August 19, 2003, 18:26
Default Re: Gravity option in Fluent?
  #3
Suresh Balasubramanian
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Thank you very much kim.

But if I don't have a VOF model should I use a different scheme because I see that the velocity vectors point out of domain if I use a standard scheme for pressure velocity coupling?

I would be thankful for your suggestions Suresh
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Old   August 20, 2003, 04:17
Default Re: Gravity option in Fluent?
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kim
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I do not quite understand your questions. What do you mean velocity vector point out of domain? Could you describe your model in detai? Is it as steady problem or unsteady problem? Multiphase or single phase. Different modelling requires deffernt scheme if you want a correct result.
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Old   August 21, 2003, 20:01
Default Re: Gravity option in Fluent?
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Suresh
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My problem is a steady state laminar flow of a viscous fluid (single phase) in a cross-like connection. i just want to see if inclusion of gravity changes flow fields.

I hope this answers your question Kim

Thanks, Suresh
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Old   August 22, 2003, 03:00
Default Re: Gravity option in Fluent?
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kim
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You can try to use sencond order upwind scheme. Anyway, u can compare with your results by applying differnt schemes.

Regards,

Yong
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Old   September 12, 2003, 05:25
Default Text Command for Vector Display definition
  #7
Laurence Wallian
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Hello,

I try to define vector Display using Text Command

I've written these following lines:

/display/set/velocity-vectors/auto-scale? no /display/set/velocity-vectors/scale-head 0.1 /display/set/velocity-vectors/color-levels 20 ; /display/velocity-vector ; vector of velocity colored by velocity-magnitude ; minimum value (m/s) 0.0 ; maximum value (m/s) 0.5 ; Scale factor 2 ; Skip every 2

But I can't find anywhere how to specify the option "Clip-to-Range" of the GUI environment.

Thank you for your help

Laurence Wallian

Cemagref Unite de recherche Technologie des equipements agro-alimentaires

17, avenue de Cucille, CS 64427 35044 Rennes cedex

tl : 02.23.48.21.21 fax : 02.23.48.21.15 E-mail : laurence.wallian@cemagref.fr

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