Direct numerical simulation of grid-generated turbulence (analysis on invariants and rotta model)

Hiroki Suzuki, Kouji Nagata, Yasuhiko Sakai, Toshiyuki Hayase, Yutaka Hasegawa, Tatsuo Ushijima

Research output: Contribution to journalArticle

Abstract

The aim of this study is to address the essential features of experimental decaying grid-generated turbulence. Specifically, this study has focused on invariants of grid turbulence in the downstream region and Rotta model by means of direct numerical simulation based on the finite difference method. The mesh Reynolds number defined by the mesh size of the grid M, streamwise mean velocity and kinematic viscosity is 2,500. Streamwise computational domain size is 112 M. The result shows that (Equation Presented.) is nearly constant such that (Equation Presented.) in the far downstream region, where X = x/M-xo/M, x is the streamwise distance from the grid and xo is the virtual origin. Rotta model is applicable in the region holding (Equation Presented.) = constant, and value of the Rotta constant is almost 1. The value can be well estimated by an estimation method introduced by previous experiments.

Original languageEnglish
Pages (from-to)2363-2374
Number of pages12
JournalNihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
Volume79
Issue number807
DOIs
Publication statusPublished - 2013
Externally publishedYes

Keywords

  • Computational fluid dynamics
  • Grid turbulence
  • Numerical simulation
  • Rotta model
  • Turbulence
  • Turbulent flow

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanical Engineering

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