REPRESENTATION OF SPACE-TIME VELOCITY AND PRESSURE FLUCTUATION CORRELATIONS BY A TENTATIVE PHENOMENOLOGICAL MODEL,

Abstract

Some difficulties in synthesizing velocity perturbation fields from two-point space-time correlation measurements are discussed including the non-uniqueness of the representation and the effects of averaging. A phenomenological model of the fluctuating velocities based on damped travelling waves has been derived. This model is based on the physical mechanism of slow speed streak 'break-up', as taken from hydrogen bubble visualization data. The model compares quite well with the two-point space-time correlation of velocity perturbations. Furthermore, the form derived for the space-time velocity correlation function is exactly the same form as the best available empirical fit to the space-time wall pressure data. (Author)

Document Details

Document Type
Technical Report
Publication Date
Aug 01, 1968
Accession Number
AD0682329

Entities

People

  • R. T. Lahey Jr.
  • Stephen Jay Kline

Organizations

  • Stanford University

Tags

DTIC Thesaurus Topics

  • Cooperation
  • Hydrogen
  • Measurement
  • Perturbations
  • Power Equipment
  • Pressure Measurement
  • Visualizations

Readers

  • Calculus or Mathematical Analysis
  • Fluid Dynamics.
  • Theoretical Analysis.

Technology Areas

  • Space
  • Space - Hall-Effect Thruster