Article ID Journal Published Year Pages File Type
1726400 Ocean Engineering 2012 10 Pages PDF
Abstract

A model problem of the flow under an air-cushion vessel is studied. Two different numerical techniques are used to determine the solution of the free-surface elevation and the wave resistance for a range of Froude number, Reynolds number, value of the pressure applied in the cushion, and depth of the water. The first numerical technique uses a velocity potential that satisfies linearized free-surface boundary conditions, whereas the second employs a finite-volume method to find a solution that satisfies the fully nonlinear free-surface boundary conditions. The results clearly show that for high Froude number and practical values of the cushion pressure, the linear-theory solution is in excellent agreement with the more exact nonlinear prediction. For lower Froude number the solution becomes unsteady, and the disagreement between the two methods is larger.

► The flow under a two-dimensional pressure patch is studied using two different numerical programs. ► Results for a wide range of cushion pressure and Froude number describe the behavior of the free surface. ► The nonlinear program is used to identify the conditions that lead to wave breaking.

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Physical Sciences and Engineering Engineering Ocean Engineering
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