How to set a transient temperature, heat flux, or heat generation boundary condition using a table with the transient profile.

 

Create a transient table with the required format in .csv extension. An example is shown below. 

What is most important here is the information after the brackets [Name] and [Data]. Under the [Name] add the name for your profile, and under [Data] add in the first column the time variable and the values, and in the other column the name of your variable and its values, e.g, temp for temperature. Fluent has some variables reserved, such as x, y, z, r, time, and angle, that cannot be used. However, for the variable in the second column, you can select any representative name that will help you to identify the profile in Fluent. 
One key aspect in the variable column is the units that you are using for the variable value. For example, for temperature, you must use kelvin, for heat flux W/m2, and for heat generation W/m3. Even if you have changed the units within Fluent, the solver engine will use SI units. 
Other considerations about the formatting of the table can be found in the following link: https://ansyshelp.ansys.com/account/secured?returnurl=/Views/Secured/corp/v252/en/flu_ug/flu_ug_bcs_sec_prof.html 

After you have your table, you can read it either by going to File -> Read -> Profile 

Or in the cell zone and boundary conditions window, you can click in Profiles… -> Read… 

After you have successfully read the table profile, you can now go to your desired boundary condition and assign the profile. The profile variable will appear under the udf/profile section. 

Finally, if you want to check the profile graphically, you can go to Results -> Profile Data.  

In the Plot Profile Data, you can select the desired axes for each variable and plot the profile.