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Old   October 15, 2001, 09:09
Default Temperature gradient
  #1
Michal
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How to obtain a temperature gradient directly from the solver for the UDF purposes? Does any macro exist to compute temperature gradient?
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Old   October 15, 2001, 15:13
Default Re: Temperature gradient
  #2
ravi
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C_T_G(c,t)[i] -- cell_t c, Thread *t, int i : gives you temperature gradient component.

C_T_G(c,t) -- cell_t c, Thread *t : gives you temperature gradient vector.
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Old   October 16, 2001, 01:26
Default Re: Temperature gradient
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Michal
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Thanks very much for Your help!
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Old   October 16, 2001, 06:02
Default Re: Temperature gradient
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Greg Perkins
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You may need to be careful when using these macros depending upon what you are doing with them. They are not generally applicable for calculating gradients at faces - ie for flux calculations. As far as I can work out they return the gradients between neighbouring cells in the specified direction.

Greg
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Old   October 19, 2001, 04:09
Default Re: Temperature gradient
  #5
Michal
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I just only want to check value of temperature gradient at my computational domain but when I use

C_UDMI(c,t,i)= C_T_G(c,t)[0];

my UDF is compiled correctly but Fluent send a SEGMENTATION VIOLATION error.

What could be a reason of that?
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Old   October 19, 2001, 05:19
Default Re: Temperature gradient
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Greg Perkins
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Did you define sufficient space for your udm's??
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Old   October 19, 2001, 05:39
Default Re: Temperature gradient
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Michal
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Yes, I defined u sufficient space for UDMI's...

My domain is axissymetric and I make:

C_UDMI(c,t,0) = C_T_G(c,t)[0] for axial direction C_UDMI(c,t,1) = C_T_G(c,t)[1] for radial direction

Is it correct?
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Old   December 3, 2001, 12:24
Default Re: Temperature gradient
  #8
Avinash kadam
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hi i need to know the temperature gradient in the domain, i am using the using the udf... but i didnt know how to display the same, please do suggest me
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