Author(s)

Dan Mateescu

Abstract

This paper presents recent computational solutions for two- and three-dimensional unsteady viscous flows with oscillating boundaries based on: (i) an enhanced hybrid-spectral method, and (ii) time-integration methods using artificial compressibility. A comparison is made between the results obtained with a mean-position analysis and with a formulation based on a time-dependent coordinate transformation, better suited for large amplitude oscillations. 1. Introduction The analysis of unsteady confined flows with oscillating boundaries recently received an increasing research interest for its applications in many engineering problems. Thus, the unsteady annular flows between cylindrical structures executing transverse oscillations, which are of particular interest for the

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