A generation method for turbulent fluctuation of wind velocity and scalar based on cholesky decomposition of turbulent fluxes: Generation of inflow turbulence including scalar fluctuation for les part 1

Tsubasa Okaze, Akashi Mochida

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

This paper aims to propose a new method to generate turbulent fluctuations of wind velocity and scalar such as temperature and pollutant based on the Cholesky decomposition of time-averaged turbulent fluxes tensor of momentum and scalar. The artificially generated turbulent fluctuations satisfy not only the prescribed profiles of turbulent fluxes of wind and scalar but also the prescribed spatial and time correlations. Following the method proposed by Xie and Castro (2008), two-dimensional random data are filtered to generate a set of two-dimensional data with the prescribed spatial correlation. Then, these data are combined with those from previous time step by using two weighting factors based on an exponential function. The method was validated by applying it to a LES computation of contaminant dispersion in a half channel flow.

Original languageEnglish
Pages (from-to)771-776
Number of pages6
JournalJournal of Environmental Engineering (Japan)
Volume79
Issue number703
DOIs
Publication statusPublished - 2014 Sep 1

Keywords

  • Boundary layer
  • Cholesky decomposition
  • Generation of turbulent scalar fluctuation
  • Large eddy simulation
  • Spatial and time correlations
  • Turbulent fluxes of momentum and scalar

ASJC Scopus subject areas

  • Environmental Engineering

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