Hi Rubem,
ThermalModel crated using thermalmodelS=createpde('thermal') lets you set up the problem in deomain specific functional interfaces. In thermaBC specifying 'Temperature' is a DirichletBC, all other forms of heat flux, specified using 'HeatFlux', 'ConvectionCoefficient', etc are Neumann BC. You can explore all the methods of thermalmodelS by calling methods(thermalmodelS) in the MATLAB Command Window.
PDE Toolbox also supports general equations based inteface, for which you can craete the analysis model without specifying physics type in the createpde function, like you tried. This model supports mathematical interface for boundary conditions. You can see the methods available for equaiton based using the methods function again.
Regards,
Ravi
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