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Co-Simulation to Bring Advanced Physics to Building Thermal Performance Analysis

Bringing advanced physics to building performance simulation (BPS) tools, by means of computational fluid dynamics (CFD) coupling, may enable significant improvement of accuracy on the prediction of energy consumption, thermal comfort, pollutant transport and mold growth risk. One of the challenges on coupling is the communication between wholebuilding simulation tool and the CFD package, with appropriate information about boundary conditions for transient calculation. This paper presents coupling techniques used with the building simulation tool Domus based on both Functional Mockup Interface (FMI) and one-to-one approach. This last one is explored in the present paper, as there is no FMU (Functional Mockup Unit) for CFD coupling, to show the effects of considering the full Navier-Stokes formulation and turbulence modeling on the thermal performance transient simulation of a dwelling. The results show non-neglectable discrepancies when advanced physics is brought for the present attic simulation.