Accession Number : ADA017718

Title :   A Calculation Method for Incompressible Axisymmetric Flows, Including Unseparated, Fully Separated, and Free Surface Flows.

Descriptive Note : Technical rept.,


Personal Author(s) : White,J. W. ; Kline,S. J.

Report Date : MAY 1975

Pagination or Media Count : 226

Abstract : An interacting zone method is developed for the analysis of completely stalled, turbulent, axisymmetric jet flows which are incompressible and nominally steady. The flow is treated as a mutual interaction problem; unlike the classical boundary layer theory, this method includes the effect of the stalled-zone blockage on the first order potential flow solution. Both a priori and ab initio predictions are obtained. A new integral turbulent boundary layer separation prediction method is developed in order to accurately predict the separation location and effective flow boundary near separation. Because the boundary layer equations require only the wall pressure from the potential flow, a new boundary integral solution is developed for the potential field. Unlike grid methods, the boundary integral method computes unknowns only over the flow boundary. By treating the stalled zone as a region of uniform (but initially unknown) pressure, the potential solution can iteratively locate the free surface. Speed of computation is significantly faster than existing grid methods for potential flow analysis. The resulting computer program provides analysis of the following types of axisymmetric flows: (1) Unseparated potential flow, with and without blowing or suction; (2) Free surface potential flow; (3) Unseparated turbulent diffuser flow; and (4) Completely separated turbulent jet flow. (Author)

Descriptors :   *Incompressible flow, *Axially symmetric flow, *Potential flow, Diffusers, Flow separation, Interactions, Turbulent flow, Jet flow, Stalling, Turbulent boundary layer, Computers, Two dimensional, Boundary layer transition, Integral equations, Free stream

Subject Categories : Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE