Gradient of the Custom Field Function

oghazian · June 27, 2011, 15:06

hi,

How can I calculate the gradient of the custom field function in FLUENT ??

Best regards,

oghazian · June 27, 2011, 15:15

I am wondering that I should define a separate UDF for calculating the gradient of the Custom Field Function ?

Micael · June 29, 2011, 15:00

You can define a UDS, but without solving for it. Instead, a DEFINE_ADJUST fonction compute the scalar value for each cell. Then FLUENT will compute the gradient (even if you do not solve the corresponding transport equation).

There is an example that do it there:
FLUENT 12.0 UDF manual --> 2.2.1 DEFINE ADJUST --> example 2

June 27, 2011, 15:06	Gradient of the Custom Field Function	#1
oghazian New Member osis Join Date: Jun 2011 Posts: 8 Rep Power: 15	hi, How can I calculate the gradient of the custom field function in FLUENT ?? Best regards,

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June 27, 2011, 15:15		#2
oghazian New Member osis Join Date: Jun 2011 Posts: 8 Rep Power: 15	I am wondering that I should define a separate UDF for calculating the gradient of the Custom Field Function ?

June 29, 2011, 15:00		#3
Micael Senior Member Micael Join Date: Mar 2009 Location: Canada Posts: 157 Rep Power: 18	You can define a UDS, but without solving for it. Instead, a DEFINE_ADJUST fonction compute the scalar value for each cell. Then FLUENT will compute the gradient (even if you do not solve the corresponding transport equation). There is an example that do it there: FLUENT 12.0 UDF manual --> 2.2.1 DEFINE ADJUST --> example 2