Accession Number:

ADA281064

Title:

The Velocity Field Created by a Shallow Bump in a Boundary Layer

Descriptive Note:

Contractor rept.

Corporate Author:

INSTITUTE FOR COMPUTER APPLICATIONS IN SCIENCE AND ENGINEERING HAMPTON VA

Personal Author(s):

• Gaster, Michael
• Grosch, Chester E.
• Jackson, Thomas L.

Report Date:

1994-04-01

Pagination or Media Count:

24.0

Abstract:

We report the results of measurements of the disturbance velocity field generated in a boundary layer by a shallow three-dimensional bump oscillating at a very low frequency on the surface of a flat plate. Profiles of the mean velocity, the disturbance velocity at the fundamental frequency and at the first harmonic are presented. These profiles were measured both upstream and downstream of the oscillating bump. Measurements of the disturbance velocity were also made at various spanwise and downstream locations at a fixed distance from the boundary of one displacement thickness. Finally, the spanwise spectrum of the disturbances at three locations downstream of the bump are presented.

Descriptors:

• *BOUNDARY LAYER
• *PERTURBATIONS
• VELOCITY
• THICKNESS
• DISPLACEMENT
• HARMONICS
• COMPUTATIONAL FLUID DYNAMICS
• SURFACES
• THREE DIMENSIONAL
• FLOW FIELDS
• PROFILES
• PLATES
• DOWNSTREAM FLOW
• VERY LOW FREQUENCY
• HARMONIC ANALYSIS

Subject Categories:

• Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE