Investigation of Periodic Boundary Conditions in Multipassage Cascade Flows Using Overset Grids

[+] Author and Article Information
I. H. Tuncer

Department of Aeronautics, Naval Postgraduate School, Monterey, CA 93943

S. Weber

BMW Rolls-Royce GmbH, Aero Engines, Dahlewitz, Germany

W. Sanz

Institut für Turbomaschinen, Graz Technical University, Graz, Austria

J. Turbomach 121(2), 341-347 (Apr 01, 1999) (7 pages) doi:10.1115/1.2841320 History: Received February 01, 1998; Online January 29, 2008


A Navier–Stokes solution method with overset grids is applied to unsteady multipassage cascade flows, and the unsteady blade loadings are compared against the single-passage solutions with the direct store interblade boundary condition. In the overset grid solutions, the multipassage domain is discretized with O-type grids around each blade and a rectangular background grid. Blade grids are allowed to move in time relative to the background grid, as prescribed by the oscillatory plunging motion. The overset grid method uses a simple, robust numerical algorithm to localize moving intergrid boundary points and to interpolate solution variables across grids. Computational results are presented for two and four-passage, subsonic and transonic flows through a turbine and a compressor cascade. The overset grid solutions over the multipassage periodic domains agree well with the single-passage solutions and the experimental data. It is concluded that the time linearization error introduced by the direct store approach is negligible in the range of flow conditions studied.

Copyright © 1999 by The American Society of Mechanical Engineers
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