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Old   June 9, 2004, 03:48
Default Cylinderical coordinate
  #1
Avesta
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hi all in cylinderical coordinate if there are not variation in teta direction ,may it simulate and compute heat transfer and Nusselt number of a tube with a 2dimentional model as rectangular?
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Old   June 9, 2004, 10:34
Default Re: Cylinderical coordinate
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ozgur
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Hi,

You have to use axisymmetric solver with rectangular domain, since you have rotational symmetry in your problem.
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Old   June 12, 2004, 08:47
Default Re: Cylinderical coordinate
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Avesta
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hi dear thanks much but in fluent there are not axisymmetric solver. there are axis and symmetric apartly.
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Old   June 13, 2004, 15:59
Default Re: Cylinderical coordinate
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Arun
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Hi

In Define->Models->Solver, you have an option of axisymmetric in "space". You have to define the symmetry edge as axis if you want to do axisymmetric calculation.

Arun
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Old   June 17, 2004, 06:56
Default Re: Cylinderical coordinate
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Avesta
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hi thank you when i define axisymmetry this error appear: Error: divergence detected in AMG solver: x-momentum Error Object: () please guide me best regard Avesta
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Old   June 17, 2004, 10:57
Default Re: Cylinderical coordinate
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Arun
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Hi

Did you do a grid check first? If you have negative volumes this error occurs. There may be other reasons but try this first.

Thanks Arun
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Old   June 18, 2004, 06:13
Default Re: Cylinderical coordinate
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Avesta
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hi thank you ok in grid check appear negative volumes. how do i change these negative volumes to positive volumes ? best regard byeeeee
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Old   June 18, 2004, 12:24
Default Re: Cylinderical coordinate
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Arun
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Hi

which grid generation software are u using? Make sure that your grid does not have intersecting grid lines. If it does, then you need to redo the grid properly.

Arun
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Old   June 19, 2004, 06:36
Default Re: Cylinderical coordinate
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Avesta
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hi thank you i use from GAMBIT guide me best regard Avesta
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Old   June 22, 2004, 09:28
Default Re: Cylinderical coordinate
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ozgur
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Hi,

When using axsy. solver, x-axis should be you axis of symmetry. Is that so in your case?
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Old   June 27, 2004, 02:38
Default Re: Cylinderical coordinate
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avesta
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hi thank you best regard avesta
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Old   June 27, 2004, 03:30
Default Re: Cylinderical coordinate
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avesta
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hi all All books on heat transfer tell me the Nusselt number of the fully-developed laminar flow in a pipes is a constant;if the wall temperature is constant,the Nu=3.66;if the heat flux is constant,the Nu will be 4.36. but when i simulate this ,Nu in constant wall temperature will be 2.59 and it do not limit to 3.66 in fully developed laminar flow. i do not know what reference values put in meno of reference valuen in report>reference values... what reference values do you recommand? i want to simulate laminar flow in a pipe as non-dimentional by Fluent? inflow: U=1,T=1 WALL: U=0, T=1 Density=1, Cp=1, Thermal Conductivity(K)=1/(Re.Pr), Viscosity=1/Re guide me best regard Avesta
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