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Treeck, C. V. et al. Direct building energy simulation based on large Eddy techniques and Lattice Boltzmann methods. In: BUILDING SIMULATION, 7., 2001, Rio de Janeiro. Anais... Rio de Janeiro, 2001. p. 1025-1032.
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Abstract

The modeling of convective flows with 3D lattice Boltzmann fluid dynamics is presented using a lattice BGK approach for low Mach number flows with variable density combined with a large eddy turbulence model. The ability to resolve non- Boussinesq density varying problems is depicted for two dimensional Rayleigh-Bénard-convection at a Rayleigh number Ra = 800,000. A complex three-dimensional example shows the status of our work presenting turbulent flow in and around a building, so far without consideration of the energy equation in the 3D full scale case. Integrated within a CAD environment, the spatial geometric model, based on an IFC building product data model, is discretized using a hierarchic data structure. Results are presented for Re = 75,000 computed on a high-performance parallel vector computer. State-of-the-art visualization techniques integrate the simulation results into the CAD model in a virtual reality environment.
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