Chandra Sekaran
Ansys Employee

In Mechanical you can use Radiation > Surface-to-surface and indicate the surfaces that will be radiating to each other. This will automatically calculate the view factors during solution and perform the radiation calculations. 

Please refer to for further details. During simulation viewfactors are computed for each element face. So, for example, if you have 1000 element faces that form a radiation enclosure you will have a 1000x1000 matrix. To get the average view factor between a source set of radiation faces and target set of radiation faces the VFQUERY APDL command can be used. This is not directly exposed in Mechanical.