DNS of a Strained Turbulent Axial Vortex

Abstract

Direct numerical simulations (DNS) of a strained turbulent axial vortex are performed using a b-spline/Fourier spectral DNS code. Extending previous DNS further in time reveals that a global measure of the turbulent kinetic energy (GTKE) decays after growing to a certain extent, contrary to the earlier picture of unbounded growth. This observation leads to a re-investigation of the strained vortex simulations performed by Qin (Qin 1998). It is observed that the GTKE shows unbounded growth after a long period of decay. The Widnall instability seems to have been captured. Large eddy simulations (LES) shall be performed in the near future to study the vortex at higher Reynolds numbers.

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Aug 01, 2001
Accession Number
ADP013687

Entities

People

  • B. Eshpuniyani
  • G. A. Blaisdell

Organizations

  • Purdue University

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Aeronautics
  • Aircrafts
  • Axial Flow
  • Commercial Aircraft
  • Computational Fluid Dynamics
  • Computer Programs
  • Energy
  • Flow
  • Flow Visualization
  • Fluid Flow
  • Instability
  • Kinetic Energy
  • Large Eddy Simulation
  • Navier Stokes Equations
  • Pipe Flow
  • Reynolds Number
  • Simulations

Fields of Study

  • Physics

Readers

  • Fluid Mechanics and Fluid Dynamics.