thank youi very much

Thanks for the correction. I am learning these softwares and do not actually know the differences between them. Yes I will use p when I do the analysis in Fluent. No further calculation will be done...

Dear friends
I have put my problem only in C++ so that you can be able to assist me. Please may you help me to:
1.write corectly the formular to determining Atb. It is supposed to be
Atb = a0 +...

My equation of line is
x=87.5
y= 126.162-(1004.082)t
z=166.162-(-1004.088)t
and 0<=t<=1.
(0 is less or equal to t but t is less or equal to 1)

I want to develop a code that applies one value...

Please assist me form the equation of line. The staring point is (87.5, 126.162, 166.162) and the end point is (87.5, 877.97, 1170.25)

How do I define a line in 3D

This code is developed in C++ and used in a computational fluid dynamics model (CFD), Fluent, and these other fetures are part of Fluent. If I get correct the part of stating my if condition then...

I want to apply heat on a tube surface (3D). The heat is to be applied on a straight line on the tube. The equation of line is
x= 87.5
y = 126.1620 + (-1*1004.0820)
z= 166.1620 + (-1*-1004.0880)
...

# include “udf.h”
/* definition variables LTIME =local time, SMER=standard meridian on which local time is based (in degrees), LMER= meridian of the observer (in degrees), N = nth day of the year*/...