UDF_for_energy_source

flanker1 · February 3, 2011, 15:19

Hi,

I could learn from FLUENT Manuals that an energy source can be defined if the dependence of production rate is constant or depends on the location, when this dependence is given by an analytical function.

My question is: is it possibe to write a UDF if the analytical form of the energy production as a function of spatial coordinates is not known, but its value in each cell center is given.

[To fit a 3D function to this individual values is not easy, thus it would be nice to avoid it.]

Thank you in advance for any answer.

ComputerGuy · February 3, 2011, 21:33

The answer is yes, but you'd have to explicitly check the cell centroid at each cell, and specify the energy generation rate on a per-cell basis.

Have you tried the following:http://www.zunzun.com/ for curve fitting? It's really great, and makes regression very simple.

ComputerGuy

flanker1 · February 4, 2011, 04:21

Thanks a lot for the answer. I haven't known about this online fitting tool. It looks smart.

zunzun · February 4, 2011, 10:16

Quote:

Originally Posted by ComputerGuy

Have you tried the following:http://www.zunzun.com/ for curve fitting? It's really great, and makes regression very simple.

Thank you for recommending my web site, zunzun.com. Please do not hesitate to contact me directly if you have any questions or suggestions for the site.

James R. Phillips
2548 Vera Cruz Drive
Birmingham, AL 35235 USA

zunzun@zunzun.com e-mail
(1 USA) 205-854-4697 home phone

February 3, 2011, 15:19	UDF_for_energy_source	#1
flanker1 New Member flanker1 Join Date: Feb 2011 Posts: 15 Rep Power: 15	Hi, I could learn from FLUENT Manuals that an energy source can be defined if the dependence of production rate is constant or depends on the location, when this dependence is given by an analytical function. My question is: is it possibe to write a UDF if the analytical form of the energy production as a function of spatial coordinates is not known, but its value in each cell center is given. [To fit a 3D function to this individual values is not easy, thus it would be nice to avoid it.] Thank you in advance for any answer.

February 4, 2011, 04:21	thanks	#3
flanker1 New Member flanker1 Join Date: Feb 2011 Posts: 15 Rep Power: 15	Thanks a lot for the answer. I haven't known about this online fitting tool. It looks smart.

February 3, 2011, 21:33		#2
ComputerGuy Senior Member Real Name :) Join Date: Jan 2010 Location: United States Posts: 192 Rep Power: 16	The answer is yes, but you'd have to explicitly check the cell centroid at each cell, and specify the energy generation rate on a per-cell basis. Have you tried the following:http://www.zunzun.com/ for curve fitting? It's really great, and makes regression very simple. ComputerGuy