A Method for Turbulent Pressure Field Measurement

Abstract

A procedure for computing the turbulent pressure field from time-resolved particle image velocimetry (PIV) velocity field data is adapted and implemented. The calculation of pressure is based on the Lagrangian acceleration term in the fluctuating momentum equation coupled with an omnidirectional spatial integration, originally developed by Liu and Katz (2006 Exp. Fluids 41:227-240). Experimental measurements of fluctuating pressure is important in the validation of numerical turbulence models and is also a fundamental source of observed aero/hydro-acoustic noise. The code suite described in this paper yields the fluctuating pressure with Lagrangian fluid acceleration and spatial gradients of velocity. Monte Carlo simulations are performed with synthetic velocity fields to study the uncertainty in the calculations, and sources of uncertainty and data requirements are discussed.

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Document Details

Document Type
Technical Report
Publication Date
Mar 18, 2020
Accession Number
AD1094348

Entities

People

  • Daniel R. Cadel

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies
  • Ground and Sea Platforms
  • Space

DTIC Thesaurus Topics

  • Boundary Layer
  • Computational Fluid Dynamics
  • Computational Science
  • Equations
  • Fluid Dynamics
  • Fluid Flow
  • Fluid Mechanics
  • Human Factors Engineering
  • Mathematical Models
  • Measurement
  • Mechanical Properties
  • Monte Carlo Method
  • Particle Image Velocimetry
  • Pressure Measurement
  • Stratified Fluids
  • Turbulence
  • Viscous Flow

Fields of Study

  • Physics

Readers

  • Computational Fluid Dynamics (CFD)
  • Fluid Mechanics and Fluid Dynamics.