The Unbounded and Bounded Boundary Layer Models for Flow Along a Wall

Abstract

In an earlier report (AFRL-RY-WP-TR-2020-0004) a new unbounded boundary layer model for describing flow along a wall was introduced. In the new model, the flow asymptotes to the free stream value. Herein, we do a more extensive comparison between the bounded and unbounded boundary layers using flow simulations on a large gap channel consisting of two parallel flat plates. The channel plate gap distance is increased until an unbounded condition is reached. For laminar flow conditions, the required gap is found to be over seven meters, far exceeding the typical wind tunnel dimensions. The results also indicate that the often-used validation of wind tunnels using Blasius profiles is misleading.

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Document Details

Document Type
Technical Report
Publication Date
Feb 01, 2020
Accession Number
AD1094086

Entities

People

  • David Weyburne

Organizations

  • Air Force Research Laboratory

Tags

Communities of Interest

  • Energy and Power Technologies
  • Materials and Manufacturing Processes
  • Space

DTIC Thesaurus Topics

  • Air Flow
  • Air Force
  • Air Force Research Laboratories
  • Boundary Layer
  • Boundary Layer Flow
  • Computational Fluid Dynamics
  • Flow
  • Fluid Dynamics
  • Fluid Flow
  • Fluid Mechanics
  • Free Stream
  • Laminar Flow
  • Layers
  • Simulations
  • Three Dimensional
  • Two Dimensional
  • Wind Tunnels

Fields of Study

  • Physics

Readers

  • Atmospheric Science/Meteorology
  • Fluid Dynamics.