How to define variable flux on a wall

mqasimali · July 17, 2013, 16:27

hello friends,
i have been simulating a flow blockage through a coolant channel of fuel assembly.
i have finished the analysis in 2d as well as 3d with average value of heat flux and results are very close to expected results.
now to achiever further refinement in my results i want to use variable heat flux along the length of channel, is there any way i could enter function of flux or variable flux to the wall in 2d or surface in 3d case????

blackmask · July 17, 2013, 22:21

Why not? The macro

Code:

DEFINE_PROFILE

would do the job.

mqasimali · July 18, 2013, 17:20

Thank you bro,
i got that option ova there but tell me what is the input file format that fluent will read?
and what is the sequence to define that profile, can you help me with a text format for it?

blackmask · July 18, 2013, 20:01

The DEFINE_PROFILE I mentioned is a macro of user defined function. You might have read the part on "profile", while is a file format. Either could be used to achieve what you wanted. The former could be easier and more efficient to implement if you have the analytical expression for the flux. You should consult the manual for the "profile" data format.

July 17, 2013, 16:27	How to define variable flux on a wall	#1
mqasimali New Member Qasim Ali Join Date: Mar 2013 Location: Islamabad, Pakistan Posts: 18 Rep Power: 13	hello friends, i have been simulating a flow blockage through a coolant channel of fuel assembly. i have finished the analysis in 2d as well as 3d with average value of heat flux and results are very close to expected results. now to achiever further refinement in my results i want to use variable heat flux along the length of channel, is there any way i could enter function of flux or variable flux to the wall in 2d or surface in 3d case????

July 17, 2013, 22:21		#2
blackmask Senior Member Join Date: Aug 2011 Posts: 421 Blog Entries: 1 Rep Power: 21	Why not? The macro Code: DEFINE_PROFILE would do the job.

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July 18, 2013, 17:20		#3
mqasimali New Member Qasim Ali Join Date: Mar 2013 Location: Islamabad, Pakistan Posts: 18 Rep Power: 13	Thank you bro, i got that option ova there but tell me what is the input file format that fluent will read? and what is the sequence to define that profile, can you help me with a text format for it?

July 18, 2013, 20:01		#4
blackmask Senior Member Join Date: Aug 2011 Posts: 421 Blog Entries: 1 Rep Power: 21	The DEFINE_PROFILE I mentioned is a macro of user defined function. You might have read the part on "profile", while is a file format. Either could be used to achieve what you wanted. The former could be easier and more efficient to implement if you have the analytical expression for the flux. You should consult the manual for the "profile" data format.