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Atmosphere 2018, 9(11), 442;

Application of GPU-Based Large Eddy Simulation in Urban Dispersion Studies

Department of Fluid Mechanics, Faculty of Mechanical Engineering, Budapest University of Technology and Economics, Műegyetem rkp. 3, 1111 Budapest, Hungary
Authors to whom correspondence should be addressed.
Received: 20 September 2018 / Revised: 30 October 2018 / Accepted: 7 November 2018 / Published: 13 November 2018
(This article belongs to the Special Issue Recent Advances in Urban Ventilation Assessment and Flow Modelling)
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While large eddy simulation has several advantages in microscale air pollutant dispersion modelling, the parametric investigation of geometries is not yet feasible because of its relatively high computational cost. By assuming an analogy between heat and mass transport processes, we utilize a Graphics Processing Unit based software—originally developed for mechanical engineering applications—to model urban dispersion. The software allows for the modification of the geometry as well as the visualization of the transient flow and concentration fields during the simulation, thus supporting the analysis and comparison of different design concepts. By placing passive turbulence generators near the inlet, a numerical wind tunnel was created, capable of producing the characteristic velocity and turbulence intensity profiles of the urban boundary layer. The model results show a satisfactory agreement with wind tunnel experiments examining single street canyons. The effect of low boundary walls placed in the middle of the road and adjacent to the walkways was investigated in a wide parameter range, along with the impact made by the roof slope angle. The presented approach can be beneficially used in the early phase of simulation driven urban design, by screening the concepts to be experimentally tested or simulated with high accuracy models. View Full-Text
Keywords: street canyon; CFD; Large Eddy Simulation (LES); urban air quality; pedestrian exposure; concentration fluctuation street canyon; CFD; Large Eddy Simulation (LES); urban air quality; pedestrian exposure; concentration fluctuation

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Kristóf, G.; Papp, B. Application of GPU-Based Large Eddy Simulation in Urban Dispersion Studies. Atmosphere 2018, 9, 442.

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