Unsteady Flow Over a Butterfly Valve


Sherif, S. A. and Morrow, T. B. and Marshall, L. R. and Dalton, C.


Butterfly valves are used in many engineering devices for controlling fluid flows. However, the flow pattern, caused by the interference of the valve, is generally not known. This study is to develop a numerical method to simulate the unsteady flowfield around a valve of arbitrary shape at a given inclination angle. To simplify the analysis, the valve is considered as two-dimensional in an unrestricted incompressible flowfield. Using the chord length and the incoming velocity as the characteristic dimensions for the length and the velocity scales, respectively, Lugt and Haussling (1974) computed the laminar flowfield around the elliptical cylinders using the Navier-Stokes equations. Since the flow may be laminar or turbulent depending on the valve geometry and the Reynolds number, it is necessary to consider the budget of the turbulent kinetic energy, as discussed by Launder and Spalding (1974), to include the possibility of laminar instability or transition to turbulent flows.

Meeting Name

Winter Annual Meeting of the American Society of Mechanical Engineers


Mechanical and Aerospace Engineering

Keywords and Phrases

Computers-Applications; Control Systems-Applications; Flow of Fluids-Vortex Flow; Fluid Mechanics; Mathematical Models

Document Type

Article - Conference proceedings

Document Version


File Type





© 1990 American Society of Mechanical Engineers (ASME), All rights reserved.

Publication Date

01 Jan 1990

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