Direct Numerical Simulation of Passive Scalar in Decaying Compressible Turbulence

Abstract

The passive scalars in the decaying compressible turbulence with the initial Reynolds number (defined by Taylor scale and RMS velocity) Re=72, the initial turbulent Mach numbers (defined by RMS velocity and mean sound speed)[2,3] Mt=0.2-0.9, and the Schmidt numbers of passive scalar Sc=2-10 are numerically simulated by using a 7th order upwind difference scheme and 8th order group velocity control scheme. The computed results are validated with different numerical methods and different mesh sizes. The Batchelor scaling with k(exp -1) range is found in scalar spectra. The passive scalar spectra decay faster with increasing the turbulent Mach number. The sheet-like structures of the passive scalar gradient are also founded. The extended self-similarity (ESS) is found in the passive scalar of compressible turbulence.

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Document Details

Document Type
Technical Report
Publication Date
Apr 14, 2005
Accession Number
ADA447096

Entities

People

  • Dexun Fu
  • Xinliang Li
  • Yanwen Ma

Organizations

  • Chinese Academy of Sciences

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Computational Fluid Dynamics
  • Convection
  • Dynamics
  • Equations
  • Flow
  • Flow Fields
  • Fluid Dynamics
  • Mach Number
  • Mechanical Properties
  • Mechanics
  • Physics
  • Physics Laboratories
  • Reynolds Number
  • Scaling Laws
  • Simulations
  • Turbulence
  • Turbulent Flow

Fields of Study

  • Physics

Readers

  • Atmospheric Science / Meteorology, specifically Wind Wave Turbulence.
  • Computational Fluid Dynamics (CFD)
  • Fluid Dynamics.