Numerical Simulation of the Disturbed Flow Through a Three-Dimensional Building Array

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Authors
  1. Yee, E.
  2. Lien,F-S.
Corporate Authors
Defence R&D Canada - Suffield, Ralston ALTA (CAN);Waterloo Univ, Waterloo ONT (CAN)
Abstract
A study of the neutrally-stratified flow within and over an array of three-dimensional (3-D) buildings (cubes) was undertaken using simple Reynolds-averaged Navier-Stokes (RANS) flow models. These models consist of a general solution of the ensemble-averaged, steadystate, three-dimensional Navier-Stokes equations, where the k-E turbulence model (k is turbulence kinetic energy and E is viscous dissipation rate) has been used to close the system of equations. Two turbulence closure models were tested; namely, the standard and Kato-Launder k-E models. The latter model is a modified k-E model designed specifically to overcome the stagnation point anomaly in flows past a bluff body where the standard k-E model overpredicts the production of turbulence kinetic energy near the stagnation point. Results of a detailed comparison between a wind tunnel experiment and the RANS flow model predictions are presented. More specifically, vertical profiles of the predicted mean streamwise velocity, mean vertical velocity, and turbulence kinetic energy at a number of streamwise locations that extend from the impingement zone upstream of the array, through the array interior, to the exit region downstream of the array are presented and compared to those measured in the wind tunnel experiment. Generally, the numerical predictions show good agreement for the mean flow velocities. The turbulence kinetic energy was underestimated by the two different closure models. After validation, the results of

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Keywords
Urban Flow Modeling;Building Arrays;Urban Flow Modelling;CFD (Computational Fluid Dynamics);Model validation;Chemical warfare agents
Report Number
DRDC-SUFFIELD-TR-2004-108 — Technical Report
Date of publication
01 Aug 2004
Number of Pages
60
DSTKIM No
CA024552
CANDIS No
522203
Format(s):
Hardcopy;CD ROM

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