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research-article

Finite Volume, CFD Based Investigation of Supercavity Pulsations

[+] Author and Article Information
Grant M. Skidmore

Penn State Applied Research Laboratory P.O. Box 30 State College, PA 16804-0030
skidmore.grant@gmail.com

Jules W. Lindau

Penn State Applied Research Laboratory P.O. Box 30 State College, PA 16804-0030
jwl10@arl.psu.edu

Timothy A. Brungart

Penn State Applied Research Laboratory P.O. Box 30 State College, PA 16804-0030
tab7@arl.psu.edu

Michael J. Moeny

Penn State Applied Research Laboratory P.O. Box 30 State College, PA 16804-0030
mjm369@arl.psu.edu

Michael P. Kinzel

Penn State Applied Research Laboratory P.O. Box 30 State College, PA 16804-0030
mpk176@arl.psu.edu

1Corresponding author.

ASME doi:10.1115/1.4036596 History: Received May 11, 2016; Revised March 29, 2017

Abstract

Computations of pulsating supercavity flows behind axisymmetric disk cavitators are presented. The method of computation is a finite volume discretization of the equations of mixture fluid motion. The gas phase is treated as compressible, the liquid phase as incompressible, and the interface accuracy enhanced using a volume of fluid approach. The reentrant, pulsating, and twin vortex modes of cavity closure are delineated and computationally resolved, including the expected hysteresis. A phase diagram of cavitation number versus ventilation rate at three Froude conditions is computationally constructed. Sample reentrant, pulsation, and twin vortex snapshots are presented. Pulsation results are compared with stability criterion from the literature as well as examined for their expected character. Computations appear to capture the complete spectrum of cavity closure conditions. A detailed comparison of computational simulation and physical experiment at similar conditions is also included as a means to validate the computational results.

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