Learning Forum

[SRP]

Hi

The free stream temperature typically refers to the temperature of the fluid outside the window, which in your case might be the ambient air temperature. You can set this temperature based on the environmental conditions of your simulation. If you're uncertain, you can choose a value close to the ambient temperature where the window is placed.

The external radiation temperature is the temperature of the surroundings external to your system that emit radiation. Again, this can be approximated based on the environmental conditions. It's often close to the free stream temperature but can be different if there are other heat sources nearby

If you need to use a UDF for setting these temperatures, you can write a define_profile  to specify the temperature distribution at the boundary. However, as mentioned earlier, this might not be necessary for setting free stream and external radiation temperatures.

By default, the number of Theta Divisions and the number of Phi Divisions are both set to 2. For most practical problems, these settings are acceptable, however, a setting of 2 is considered to be a coarse estimate

For more details, Please refer to fluent user's guide: 14.3.5. Setting Up the DO Model (ansys.com)

Thank you.