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Research Abstracts Online
January 2008 - March 2009

University of Minnesota Twin Cities
Institute of Technology
Department of Civil Engineering
St. Anthony Falls Laboratory

PI: Roger E. A. Arndt, Associate Fellow

Partially and Fully Cavitating Flows

Cavitation is an important consideration in a variety of engineering applications involving liquid flow. As the performance of pumps and turbines is increased and hydrofoil ships are designed for higher speeds, it becomes necessary to design lifting surfaces that can operate effectively in the cavitating mode. The Arndt group’s research indicates that sheet/cloud cavitation is a highly complex and very important subset of the overall problem. Their earlier work has investigated the highly periodic formation of cloud cavitation that leads to a highly structured wake consisting of vortical clouds of bubbles. This phenomenon leads to unsteady lift that cannot be accurately predicted at this stage. The group extended their numerical research to include fully cavitating and ventilated flows as part of a long-term effort to develop the complex computational tools to study a variety of cavitation problems. In the case of cavitating flows, they have discovered that the physics of air demand are not well understood and they are extending their work to include this topic. They supplement their computational efforts with detailed experimental work in a high-speed water tunnel.

Group Members

Erik Axdahl, Undergraduate Student
William Hambleton, Research Associate
Arnar Hjartarson, Graduate Student
Morten Kjeldsen, Norwegian University of Science and Technology, Trondheim, Norway
James E. Kopriva, Graduate Student
Qiao Qin, White Hydraulics, Inc., Hopkinsville, Kentucky
Martin Wosnik, Research Associate
Sheng Xu, Visiting Researcher