Date of Award

Summer 1988

Document Type

Dissertation

Degree Name

Doctor of Philosophy (PhD)

Department

Mechanical & Aerospace Engineering

Program/Concentration

Mechanical Engineering

Committee Director

Oktay Baysal

Committee Member

Surendra N. Tiwari

Committee Member

John Mark Dorrepaal

Committee Member

Robert L. Stallings, Jr.

Committee Member

Ernst von Lavente

Abstract

Computations have been performed to simulate turbulent supersonic, transonic, and subsonic flows past three-dimensional deep, transitional, and shallow cavities. Simulation of these self sustained oscillatory flows has been generated through time accurate solutions of Reynolds averaged full Navier-Stokes equations using the explicit MacCormack scheme. The Reynolds stresses have been modeled, using the Baldwin-Lomax algebraic turbulence model with certain modifications. The computational results include instantaneous and time averaged flow properties everywhere in the computational domain. Time series analyses have been performed for the instantaneous pressure values on the cavity floor. Comparison with experimental data is made in terms of the mean static pressure and the frequency spectra of the oscillation along the cavity floor. The time-averaged computational results show good agreement with the experimental data along the cavity walls. The features of open, transitional and closed cavity flows and effects of the third dimension have been illustrated through computational graphics. The three-dimensionality of cavity flows has been elucidated pictorially.

DOI

10.25777/qbn9-jg72

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