Exhaust muuffler + TEG

I have a muffler I want to run a flow simulation with thermal analysis using ANSYS Fluent or solidworks attaching thermoelectrical generators to, I have the cad files for the muffler and for the TEG separatley and a CAD file with an attempt to couple them together, but I want to asemble them together better and run a flow simulation that tells me based in the boundary conditions how much electric power I can harvest from the heat dissipated from the exhaust gases inside the muffler