Accession Number:

ADA023939

Title:

On the Nominally Steady Two-Dimensional Time-Mean Turbulent Boundary Layer.

Descriptive Note:

Interim rept. 1 May 75-31 Jan 76,

Corporate Author:

PURDUE UNIV LAFAYETTE IND COMPUTATIONAL FLUID MECHANICS GROUP

Personal Author(s):

• Walker,J. D. A.
• Abbott,D. E.
• Scharnhorst,R. K.

Report Date:

1976-02-01

Pagination or Media Count:

93.0

Abstract:

The flow in the wall layer of a turbulent boundary layer, which is two-dimensional and steady in the time-mean sense, is investgated. The theory is motivated by recent experimental evidence that reveals that the wall layer is a region which is laminar-like in character and which is dominated by the brusting phenomenon. A solution is obtained for the time dependent flow in the wall layer which is valid during the period between bursts from this is a mean profile is defined. It is demonstrated that the wall region flow is not universal but exhibits a strong dependence on pressure gradient. The theory is compared directly with experimental data and the agreement is very satisfactory. Author

Descriptors:

• *TURBULENT BOUNDARY LAYER
• *TWO DIMENSIONAL FLOW
• VELOCITY
• PRESSURE GRADIENTS
• STEADY STATE
• THICKNESS
• EXPERIMENTAL DATA
• TIME DEPENDENCE
• SHEAR STRESSES
• WAKE
• PARTIAL DIFFERENTIAL EQUATIONS
• WALLS
• FLAT PLATE MODELS

Subject Categories:

• Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE