The University of Southampton
University of Southampton Institutional Repository

Efficient generation of inflow conditions for large-eddy simulation of street-scale flows

Xie, Zheng-Tong and Castro, Ian P. (2008) Efficient generation of inflow conditions for large-eddy simulation of street-scale flows Flow Turbulence and Combustion, 81, (3), 449 -470. (doi:10.1007/s10494-008-9151-5).

Record type: Article


Using a numerical weather forecasting code to provide the dynamic largescale inlet boundary conditions for the computation of small-scale urban canopy flows requires a continuous specification of appropriate inlet turbulence. For such computations to be practical, a very efficient method of generating such turbulence is needed. Correlation functions of typical turbulent shear flows have forms not too dissimilar to decaying exponentials. A digital-filter-based generation of turbulent inflow conditions exploiting this fact is presented as a suitable technique for large eddy simulations computation of spatially developing flows. The artificially generated turbulent inflows satisfy the prescribed integral length scales and Reynoldsstress-tensor. The method is much more efficient than, for example, Klein’s (J Comp Phys 186:652–665, 2003) or Kempf et al.’s (Flow Turbulence Combust 74:67–84, 2005) methods because at every time step only one set of two-dimensional (rather than three-dimensional) random data is filtered to generate a set of two-dimensional data with the appropriate spatial correlations. These data are correlated with the data from the previous time step by using an exponential function based on two weight factors. The method is validated by simulating plane channel flows with smooth walls and flows over arrays of staggered cubes (a generic urban-type flow). Mean velocities, the Reynolds-stress-tensor and spectra are all shown to be comparable with those obtained using classical inlet-outlet periodic boundary conditions. Confidence has been gained in using this method to couple weather scale flows and street scale computations.

PDF efficient_generation_of_inflow_conditiosn_for_large_eddy_simulation_of_street-scale_flows_ztx_and_ipc.pdf - Accepted Manuscript
Download (1MB)

More information

Submitted date: 30 August 2007
Published date: 17 April 2008
Keywords: weather scale, urban cfd, coupling, bluff bodies, channel flow
Organisations: Aerodynamics & Flight Mechanics


Local EPrints ID: 52402
ISSN: 1386-6184
PURE UUID: 2db3f200-f4ed-4ef0-9cbe-ffa3692ce8e4
ORCID for Zheng-Tong Xie: ORCID iD

Catalogue record

Date deposited: 08 Jul 2008
Last modified: 17 Jul 2017 14:40

Export record


Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton:

ePrints Soton supports OAI 2.0 with a base URL of

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.