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Abstract:	In diesem Beitrag werden Belüftungseffekte am Beispiel des EnergieForums Berlin untersucht. Um Erkenntnisse über den Einfluss fluktuierender Windfelder auf die Belüftung zu erzielen, wird die Windumströmung und Temperatur im und um das Atriumgebäude mit einer Large Eddy Simulation (LES)-Modell zeitaufgelöst und räumlich untersucht. Dazu wird das Lattice Boltzmann-Verfahren mit dem Multi Relaxation Time (MRT)-Modell auf einem D3Q19-Gitter verwendet. Das kürzlich entwickelte Eso-Twist-Verfahren, das nur einen einzigen Lattice Boltzmann-Verteilungssatz benötigt, kommt zum Einsatz. Als LES-Modell wird das Smagorinsky-Modell verwendet. Zur Temperaturmodellierung dient das HTLB-Verfahren. Die Simulationen werden CUDA-basiert auf einer GeForceGTX 580 GPGPU durchgeführt. Anhand der Simulationen wird der Abfall der Tracergaskonzentration über der Zeit sowie der mittlere, durch Temperaturunterschiede und äußeren Wind induzierte Fluss bestimmt. Numerical simulation of building ventilation with a Lattice Boltzmann LES model. 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 LB distributions, 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 tracer-gas concentration over time and the mean flow through the building generated by temperature gradients and external wind is determined.
Source:	Bauphysik 35 (2013), No. 1
Page/s:	2-7
Language of Publication:	German

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