Conference Paper

Proceedings of BauSim Conference 2012: 4th Conference of IBPSA-Germany and Austria

Numerische Simulation von Gebäudebelüftung bei äusserem Wind mit einem Lattice Boltzmann LES Modell

Sonja Uphoff, Manfred Krafczyk, Martin Schönherr, Maik Stiebler

Abstract: In this contribution ventilation effects are studied for the EnergieForum Berlin. To estimate the influence of external wind fields on the ventilation process, wind and temperature fields are simulated with a large eddy simulation (LES) model. With this approach spatially-and time-resolved output is generated. The Lattice Boltzmann method is being used on a D3Q19 grid with a multiple relaxation time (MRT) model. The recently developed EsoTwist scheme, which uses only a single set of LBdistributions, is employed. The Smagorinsky model serves as the LES model. To model the temperature dynamics, the HTLBE method is used. The simulations are CUDA-based and carried out on a GeForce GTX580 GPGPU. The decay of the tracergas concentration over time and the mean flow through the building generated by temperature gradients and external wind, is determined.
Pages: 34 - 40
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