Large Eddy Simulation Inflow Generation Using Reduced Length Scales for Flows Past Low-Rise Buildings

Ava Shahrokhi (), Julien Berthaut-Gerentes, Lin Ma, Derek Ingham and Mohamed Pourkashanian
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Ava Shahrokhi: Maritime and Mechanical Engineering, Liverpool John Moores University, Liverpool L3 3AF, UK
Julien Berthaut-Gerentes: Meteodyn, Meteorology and Dynamics, 44100 Nantes, France
Lin Ma: Energy2050, Department of Mechanical Engineering, University of Sheffield, Sheffield S10 2TN, UK
Derek Ingham: Energy2050, Department of Mechanical Engineering, University of Sheffield, Sheffield S10 2TN, UK
Mohamed Pourkashanian: Energy2050, Department of Mechanical Engineering, University of Sheffield, Sheffield S10 2TN, UK

Sustainability, 2023, vol. 15, issue 17, 1-18

Abstract: When undertaking wind assessment around buildings using large eddy simulation (LES), the implementation of the integral length scale at the inlet for inflow generation is controversial, as real atmospheric length scales require huge computational domains. While length scales significantly influence inflow generation in the domain, their effect on the downstream flow field has not, as yet, been investigated. In this paper, we validate the effectiveness and accuracy of implementing a reduced turbulence integral length scale for inflow generation in LES results at the rooftop of low-rise buildings and develop a technique to estimate the real local length scales using simulation results. We measure the wind locally and calculate the turbulence length scales from the energy spectrum of the wind data and simulation data. According to these results, there is an excellent agreement between the length scale from simulation and measurement when they are scaled with their corresponding freestream/inlet value. These results indicate that a reduced integral length scale can be safely used for LES to provide a reliable prediction of the energy spectrum as well as the length scales around complex geometries. The simulation results were confidently employed to obtain the best location for a wind turbine installation on low-rise buildings.

Keywords: large eddy simulation; integral length scale; wind assessment; wind turbine installation (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2023
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