I. Introduction
 

  II. Gradient temperature as boundary conditions

II-1 The C++ Program

II-2 Importation and compilation in Fluent

II-3 Results
 

  III. Gradient temperature as initialization

III-1 Creation of a custom field function

III-2 Use of the function

III-3 Results
 

IV. Creation of a macro

IV-1. Define a macro

IV-2. Use a macro

  V.Conclusion