Numerical simulation of flows near and through a two-dimensional array of buildings


  1. Yee, E.
  2. Lien, F-S.
  3. Cheng, Y.
Corporate Authors
Defence Research Establishment Suffield, Ralston ALTA (CAN);Waterloo Univ, Waterloo ONT (CAN)
A numerical simulation has been performed of turbulent flow near and through a two dimensional array of rectangular buildings (bluff bodies) in a neutrally stratified background flow. The model used for the simulation was the steady-state Reynolds-averaged Navier-Stokes equations with an isotropic, linear eddy viscosity formulation for the Reynolds stresses, and the eddy viscosity was determined using a high-Reynolds number form of the k-epsilon turbulence-closure model with the boundary conditions at the wall obtained with the wall-function approach. The resulting system of partial differential equations along with the concomitant boundary conditions for the problem was solved using the SIMPLE algorithm in conjunction with a non-orthogonal, colocated, cell-centered, finite volume procedure. The predictive capabilities of the numerical simulation of urban flow are validated against a very detailed and comprehensive wind tunnel data set. Vertical profiles of the mean stream-wise and vertical velocities and the turbulence kinetic energy are presented and compared to those measured in the wind tunnel simulation. In addition to the comparison between modeled and measured results, the numerical simulation is used to aid in the interpretation of certain features of the flow observed in the wind tunnel simulation. TRUNCATED
CFD (Computational Fluid Dynamics);Model validation;Turbulence Modelling in Urban Canopies;Urban Flow Modelling
Report Number
DRES-TR-2001-115 — Technical Report
Date of publication
01 Dec 2001
Number of Pages
Hardcopy;Document Image stored on Optical Disk

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