error in computing Heat Flux on CFD-Post of a Steady simulation
 

Hi,guys
I use CFX to simulate the ventilation and thermal conditions of a room. Here is the problem: when I want to compute the Heat Flux of a heater in the room in CFD-Post, I can compute it by using areaInt(Heat Flux )@Heater, it is OK when it's a transient model, but for the steady model, there is no Heat Flux or Wall Heat Flux in the Variable list. What wrong with it?