# Temperature profile UDF for 3D cylinder surface

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 June 5, 2015, 12:17 Temperature profile UDF for 3D cylinder surface #1 New Member   Himel Barua Join Date: Aug 2014 Posts: 2 Rep Power: 0 Hi, I am trying to incorporate a temperature profile on a surface of a 3D cylidner. I have been using this code. But, when i tried to interprete the code it starts to say undeclared variable. I have some idea to write UDF for 2D case where the boundary is a line, But for 3D case where the boundary is surface i am not very sure. Can anyone please help me in this regard? I am giving the code here. #include "udf.h" DEFINE_PROFILE(temperature_prof,thread,index) { real x[ND_ND]; real y; face_t f; begin _f_loop (f, thread) { F_centroid(x,f,thread); y=x[0]; F_PROFILE(f,thread,index)=-11497.5*y*y-659.781*y+1350; } end_f_loop(f,thread) } I am confused about particularly the red line, for 2D surface sholud the x should be 1D or 2D array ?

 June 16, 2015, 10:59 UDF for Imposing Heat Transfer Coefficient as a function of temperature on a line #2 New Member   Joseph Thodiyil Join Date: Jun 2015 Posts: 2 Rep Power: 0 Hi, I am new to UDF's. I am trying to impose a Convection heat transfer coefficient on a line on the OD of the pipe (in a pipeline 2D axisymmetric model), as function of the surface temperature. This is my attempt. Please provide your comments. /*---------------------------------------------------------------------------------------- heffupstream_rev.c UDF for specifying steady-state external CHTC, heff on a line as a function of Surface Temperature, Ts in a 2D axisymmetric CFD model: heff(Ts) = beta1*exp(beta2*Ts) + beta3 Temperature Ts is in Kelvins. /*---------------------------------------------------------------------------------------*/ #include "udf.h" #define beta1 8.83421; /* W/m^2.K */ #define beta2 1.45536e-3; /* 1/K */ #define beta3 -5.25737; /* W/m^2.K */ /* t is a pointer to the face's thread */ DEFINE_PROFILE(heff_upstream, c, t) { /* Variable Declarations */ real Ts = C_T(c,t); /* Ts is in Kelvins & C_T is the Cell Temperature variable Macro */ face_t f; /* f is a face thread index */ begin_f_loop(f,t) { F_PROFILE(f, t) = beta1 * exp(beta2*Ts) + beta3; } end_f_loop(f, t) }

 Tags fluent, temperature profile, udf

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