Accession Number:

AD1094086

Title:

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

Descriptive Note:

Technical Report,01 Nov 2014,13 Apr 2015

Corporate Author:

Air Force Research Laboratory/RYDH Wright-Patterson AFB United States

Personal Author(s):

Report Date:

2020-02-01

Pagination or Media Count:

30.0

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.

Subject Categories:

  • Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE