# udf for heatflux to be applied on a horizontal plate

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 March 22, 2014, 09:36 udf for heatflux to be applied on a horizontal plate #1 New Member   Join Date: Mar 2014 Posts: 1 Rep Power: 0 hi friends i need a little favour asap.I've to apply a heat flux equation on the top edge of a horizontal plate(50 micro m * 50 micro m ) . I'm really new to fluent as i was working on APDL.I find it difficult to apply this function in APDL so i'm trying FLUENT . THIS IS MY PROBLEM from starting of the edge ,up to a length of 20 micro meter , heat flux is 4.41 * e^(x^2 ) , where x represents length along the edge. Then from 20 micrometer on wards upto the end of the edge equation is h*(T - 298 ), where h is constant and T is the temperature at the end of each iteration . Please help me on this.

 March 23, 2014, 15:53 #2 Senior Member   François Grégoire Join Date: Jan 2010 Location: Laval University, Canada Posts: 366 Rep Power: 8 Hi, I only have a partial answer. What you need is a DEFINE_PROFILE macro, see the Ansys Fluent UDF Manual 15.0: Section 2.3.19.3. Example 1 - Pressure Profile. It's a straightforward example showing how you can apply a position-dependent profile. The problem in your case is that you want to define a heat flux boundary condition when x <= 20 µm, and a convection boundary condition elsewhere. I'm not sure if you can do that. Maybe someone else can help you with that.

 March 24, 2014, 06:40 #3 Senior Member     Daniele Join Date: Oct 2010 Location: Italy Posts: 918 Rep Power: 15 You can do it, use define_profile as macfly suggested. You have to work in pre-processing; if you want to apply 2 different boundary conditions on the top edge, simply split the top edge into two parts and assign 2 different names for that walls; then in fluent you will assign the udf for heat flux f(x) to one wall and the other boundary condition to the second one. Daniele macfly likes this.

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