Realizing turbulent statistics

Jérôme Hepffner, Yoshitsugu Naka, Koji Fukagata

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

How to design an artificial inflow condition in simulations of the Navier-Stokes equation that is already fully turbulent? This is the turbulent inflow problem. This first question is followed by: How much of the true turbulence must be reproduced at the inflow? We present a technique able to produce a random field with the exact two-point two-time covariance of a given reference turbulent flow. It is obtained as the output of a linear filter fed with white noise. The method is illustrated on the simulation of a turbulent free shear layer. The filter coefficients are obtained from the solution of the Yule-Walker equation, and the computation can be performed efficiently using a recursive solution procedure. The method should also be useful in the study of flow receptivity, when the processes of transition to turbulence are sensitive to the perturbation environment.

Original languageEnglish
Pages (from-to)54-80
Number of pages27
JournalJournal of Fluid Mechanics
Volume676
DOIs
Publication statusPublished - 2011 Jun 10

Fingerprint

Turbulence
turbulence
Statistics
statistics
linear filters
shear layers
White noise
white noise
turbulent flow
Navier-Stokes equation
Navier Stokes equations
Turbulent flow
simulation
filters
perturbation
output
coefficients

Keywords

  • shear layer turbulence
  • turbulence simulation

ASJC Scopus subject areas

  • Mechanical Engineering
  • Mechanics of Materials
  • Condensed Matter Physics

Cite this

Realizing turbulent statistics. / Hepffner, Jérôme; Naka, Yoshitsugu; Fukagata, Koji.

In: Journal of Fluid Mechanics, Vol. 676, 10.06.2011, p. 54-80.

Research output: Contribution to journalArticle

Hepffner, Jérôme ; Naka, Yoshitsugu ; Fukagata, Koji. / Realizing turbulent statistics. In: Journal of Fluid Mechanics. 2011 ; Vol. 676. pp. 54-80.
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