Hi,
Based on the documentation, a user cannot sum the heat through a surface using the "Wall Calculator" unless it is the last step/time.
"Heat Flux is based on the thermal residual from the heat transfer solution. Note that heat flux values from intermediate saved iterations or time steps are not accessible on the Wall dialog. Also, heat flux values from moving objects are not available."
So, is there another way within the software to sum the heat fluxes on a surface (or edge in my 2D case) at any time step in the transient heat transfer analysis? Seems like a basic need.