# udf for Temperature profile

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 November 27, 2008, 09:01 udf for Temperature profile #1 Ralf Guest   Posts: n/a Hi! i have a solid, and i would like to define an initial temperature profile for cooling calculation in x direction (a polynom) - in y direction, the temp. should be constant. I have created follwing UDF, but somehow, it does not work... Maybe there is something with the units? my mesh is created in mm. the solid is 100 mm long and there should be a temp. drop at the end to 960K. Any idea? Ralf #include "udf.h" DEFINE_PROFILE(start_temperature,thread,index) { real y[ND_ND]; real x; face_t f; begin_f_loop(f,thread) { F_CENTROID(y,f,thread); x = y[1]; F_PROFILE(f,thread,index) = 277103.*x*x*x -64574.*x*x + 2416.*x + 1099.; } end_f_loop(f,thread) }

 November 27, 2008, 13:02 Re: udf for Temperature profile #2 bohis Guest   Posts: n/a I guess there should be should be 0 instead of 1. I mean this: x = y[0];

 November 28, 2008, 04:36 Re: udf for Temperature profile #3 Ralf Schmidt Guest   Posts: n/a yes!! that's it!! now, it works!! thanks a lot! For me, without c+ knowledge, it is rather difficult to understand these udf, also the udf manual is not very helpful for these problems... Ralf

 November 28, 2008, 05:31 Re: udf for Temperature profile #4 Rogerio Fernandes Brito Guest   Posts: n/a I think u must do 2 UDF´s and not only one. One for x and other for y. Then, u can input the direction of your temperature field, as u do with velocity components. Why did u use "x = y[1];"?

 November 28, 2008, 07:35 Re: udf for Temperature profile #5 Ralf Guest   Posts: n/a Hi, the udf works for my 2d. model. Attached for completeness the udf. T = x*x*x*277103. -x*x*64574. + x*2416. + 1099. is the polynome, that describes the Temp. distribution (x in m !!!) Thanks you for your help!!! Ralf ----------------------- #include "udf.h" DEFINE_PROFILE(start_temperature,thread,index) { real y[ND_ND]; real x; cell_t c; begin_c_loop(c,thread) { C_CENTROID(y,c,thread); x = y[0]; F_PROFILE(c,thread,index) = x*x*x*277103. -x*x*64574. + x*2416. + 1099.; } end_c_loop(c,thread) }

 December 6, 2008, 02:42 ask an question about udf for Temperature profile #6 lucy Guest   Posts: n/a Ralf, your UDF "DEFINE_PROFILE(start_temperature,thread,index ) "for initialize temperature,not for boundary condition? lucy

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