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Rayleigh number Custom field function

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Old   October 13, 2017, 01:26
Default Rayleigh number Custom field function
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Praphul T
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Hi ,

I would like to plot a custom field function of Rayleigh number with time in Fluent. ( I am simulating a natural convection problem in a 3D rectangular enclosure ). The formula for Rayleigh number is Ra = \frac{g \beta \Delta T L^{3}}{\nu \alpha} . I would like to get the values of these fluid properties from the simulation.

The problem is i am unable to find these properties and constants g, \beta ,\Delta T , L , \nu , \alpha inside custom field function in fluent while defining the cff. Is there a solution to this problem ? Can anyone guide me on how to implement it ?

Thanks in advance.
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Old   November 4, 2017, 10:26
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Praphul T
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It will be certainly helpful if some can help me on this issue. It might seem trivial to some of you but can help a lot in getting ahead in the learning curve.
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Old   November 13, 2017, 02:48
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Vignesh Lakshmanan
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Quote:
Originally Posted by praphul View Post
Hi ,

I would like to plot a custom field function of Rayleigh number with time in Fluent. ( I am simulating a natural convection problem in a 3D rectangular enclosure ). The formula for Rayleigh number is Ra = \frac{g \beta \Delta T L^{3}}{\nu \alpha} . I would like to get the values of these fluid properties from the simulation.

The problem is i am unable to find these properties and constants g, \beta ,\Delta T , L , \nu , \alpha inside custom field function in fluent while defining the cff. Is there a solution to this problem ? Can anyone guide me on how to implement it ?

Thanks in advance.
You know g is 9.81; Your beta is thermal expansion coefficient, which is 1/T (1/fluid temperature). L is characteristic length which is Volume of the body/Surface area of the body; Dynamic viscosity (Nu) , Diffusivity (alpha) can be easily found onlne at the corresponding fluid temperature
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custom field function., fluent, natural convection, rayleigh number, udf

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