Large eddy simulation of unstably stratified turbulent flow over urban-like building arrays
type: Item
instance of: scholarly article
title: Large eddy simulation of unstably stratified turbulent flow over urban-like building arrays
zbMATH Open document ID: 1397.76055
DOI: 10.1155/2013/783187
author: Bobin Wang
author: Guixiang Cui
published in: Journal of Applied Mathematics
publication date: 2018-10-10T00:00:00Z
review text: Summary: Thermal instability induced by solar radiation is the most common condition of urban atmosphere in daytime. Compared to researches under neutral conditions, only a few numerical works studied the unstable urban boundary layer and the effect of buoyancy force is unclear. In this paper, unstably stratified turbulent boundary layer flow over three-dimensional urban-like building arrays with ground heating is simulated. Large eddy simulation is applied to capture main turbulence structures and the effect of buoyancy force on turbulence can be investigated. Lagrangian dynamic subgrid scale model is used for complex flow together with a wall function, taking into account the large pressure gradient near buildings. The numerical model and method are verified with the results measured in wind tunnel experiment. The simulated results satisfy well with the experiment in mean velocity and temperature, as well as turbulent intensities. Mean flow structure inside canopy layer varies with thermal instability, while no large secondary vortex is observed. Turbulent intensities are enhanced, as buoyancy force contributes to the production of turbulent kinetic energy.
Mathematics Subject Classification ID: 76F65
Mathematics Subject Classification ID: 76F45
zbMATH DE Number: 6950865
Wikidata QID: Q59004418
MaRDI profile type: Publication
full work available at URL: https://doi.org/10.1155/2013/783187
OpenAlex ID: W1966791861
DBLP publication ID: journals/jam/WangC13b
description: scientific article; zbMATH DE number 6950865