Title: Steady and unsteady computations of turbulent flows induced by a 4/45° pitched-blade impeller
Authors: Wechsler, Klaus
Breuer, Michael  
Durst, Franz
Language: eng
Issue Date: 1999
Publisher: ASME
Document Type: Article
Journal / Series / Working Paper (HSU): Journal of Fluids Engineering, Transactions of the ASME
Volume: 121
Issue: 2
Page Start: 318
Page End: 329
Publisher Place: New York
The present paper summarizes steady and unsteady computations of turbulent flow induced by a pitched-blade turbine (four blades, 45° inclined) in a baffled stirred tank. Mean flow and turbulence characteristics were determined by solving the Reynolds averaged Navier-Stokes equations together with a standard k-ϵ turbulence model. The round vessel had a diameter of T = 152 mm. The turbine of diameter T/3 was located at a clearance of T/3. The Reynolds number (Re) of the experimental in vestigation was 7280, and computations were performed at Re = 7280 and Re = 29, 000. Techniques of high-performance computing were applied to permit grid sensitivity studies in order to isolate errors resulting from deficiencies of the turbulence model and those resulting from insufficient grid resolution. Both steady and unsteady computations were performed and compared with respect to quality and computational effort. Unsteady computations considered the time-dependent geometry which is caused by the rotation of the impeller within the baffled stirred tank reactor. Steady-state computations also considered neglect the relative motion of impeller and baffles. By solving the governing equations of motion in a rotating frame of reference for the region attached to the impeller, the steady-state approach is able to capture trailing vortices. It is shown that this steady-state computational approach yields numerical results which are in excellent agreement with fully unsteady computations at a fraction of the time and expense for the stirred vessel configuration under consideration. © 1999 by ASME.
Organization Units (connected with the publication): Universität Erlangen-Nürnberg
ISSN: 00982202
Publisher DOI: 10.1115/1.2822210
Appears in Collections:Publications of the HSU Researchers (before HSU)

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