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TECHNICAL PAPERS

An Overset Finite-Element Large-Eddy Simulation Method With Applications to Turbomachinery and Aeroacoustics

[+] Author and Article Information
C. Kato

Institute of Industrial Science, University of Tokyo, Tokyo, Japane-mail: ckato@iis.u-tokyo.ac.jp

M. Kaiho

Mechanical Engineering Research Laboratory, Hitachi Ltd., Ibaraki, Japan

A. Manabe

Research & Development Laboratory, Hitachi Industries Co., Ltd., Ibaraki, Japan

J. Appl. Mech 70(1), 32-43 (Jan 23, 2003) (12 pages) doi:10.1115/1.1530637 History: Received July 30, 2001; Revised June 11, 2002; Online January 23, 2003
Copyright © 2003 by ASME
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References

Figures

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Schematic view of an example of overset grids from dual frames of reference
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Example of a subdomain mesh partitioned by the RGB method (computational mesh for flow in a cubic cavity partitioned into eight subdomains)
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Sustained parallel computing performance
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Cross-sectional views of the test pump (note: arrowheads in the figure indicate the positions where pressure fluctuations were measured)
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Computational mesh for a mixed-flow pump, composed of meshes for an inlet whirl-stop, an impeller, and a double-volute discharge casing
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Computed instantaneous distributions of surface pressure (Q/Qd=100%)
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Computed instantaneous distributions of surface pressure (Q/Qd=60%)
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Comparison of head-flow characteristics
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Computed fluid forces acting on the impeller (Q/Qd=100%)
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Computed power spectra of fluid forces on the impeller (Q/Qd=100%)
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Comparison of fluctuations in radial thrust force on the impeller
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Computed static-pressure fluctuations at the inner tip of the tongue (Q/Qd=100%)
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Overset meshes for flow around an insulator (fine-mesh case)
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Regions of instantaneous reverse flow
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Instantaneous distribution of streamwise-velocity in the insulator’s midheight plane
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Instantaneous distribution of surface pressure
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Fluctuations in streamwise velocity in the near wake (upper) and the power spectra of these fluctuations (lower)
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Computed far-field sound-pressure fluctuations (upper) and their power spectra (lower)
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Instantaneous sound-source distributions in the near wake: centerline plane (top), midheight plane (middle), and a plane one diameter downstream from the insulator (bottom)

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