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TECHNICAL BRIEFS

A Deterministic Stress Model for Rotor-Stator Interactions in Simulations of Average-Passage Flow

[+] Author and Article Information
Charles Meneveau, Joseph Katz

Department of Mechanical Engineering, The Johns Hopkins University, Baltimore, MD 21218

J. Fluids Eng 124(2), 550-554 (May 28, 2002) (5 pages) doi:10.1115/1.1458580 History: Received November 29, 2000; Revised November 19, 2001; Online May 28, 2002
Copyright © 2002 by ASME
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Figures

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(a) Measured distribution of deterministic kinetic energy and (b) measured deterministic shear stress in stator passage, deduced from PIV data in centrifugal pump (Sinha et al. 7). (c) Location of the sample area in the pump.
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(a) Measured angle between the velocity and the tangential direction, at a point P. P is shown in (b). Solid circles: Angle of the phase-averaged velocity as function of rotor phase (orientation). Solid line: angle obtained by sweeping the measured passage-averaged velocity in the rotor frame past point P, as function of angular position of the blade. Dotted line: The bimodal approximation of the variations in the orientation of the velocity used in the present analysis. (b) Mesh used in FLUENT™ calculations of flow in the stator domain. The computational domain is marked by the dark contour. Cyclic periodic boundary conditions are used, and two cyclic repetitions are shown for clarity. The inlet of the computational domain is the segment I1-I2 and the outlet is O1-O2.
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Streamlines of velocity fields computed for different inlet conditions. (a) k=1—the high inlet angle of 20 deg case; (b) k=2—the low inlet angle of 10 deg case. In both cases shown the RNG k-ε model is used. Similar results are obtained using the traditional k-ε model with near-wall corrections. The flow in (a) exhibits leading edge separation, while the flow in (b) remains attached.
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(a) Deterministic kinetic energy (−τiiS,det/2), as calculated from the proposed model. (b) Deterministic shear stress (τ12S,det), as calculated from the proposed model.

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