Improved Approximate Method for Simulating Frequency-Dependent Friction in Transient Laminar Flow

[+] Author and Article Information
G. A. Schohl

Engineering Laboratory, Tennessee Valley Authority, Norris, TN 37828

J. Fluids Eng 115(3), 420-424 (Sep 01, 1993) (5 pages) doi:10.1115/1.2910155 History: Received June 26, 1992; Revised November 02, 1992; Online May 23, 2008


A new approximation to the weighting function in Zielke’s (1967) equation is used in an improved implementation of Trikha’s (1975) method for including frequency-dependent friction in transient laminar flow calculations. The new, five-term approximation was fitted to the weighting function using a nonlinear least squares approach. Transient results obtained using the new approximating function are nearly indistinguishable from results obtained using the exact expression for the weighting function.

Copyright © 1993 by The American Society of Mechanical Engineers
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