Accession Number:

ADA250960

Title:

The Free Surface Signature of Unsteady, Two-Dimensional Vortex Flows

Descriptive Note:

Technical rept.

Corporate Author:

MICHIGAN UNIV ANN ARBOR DEPT OF MECHANICAL ENGINEERING AND APPLIED MECHANICS

Personal Author(s):

Report Date:

1989-04-01

Pagination or Media Count:

78.0

Abstract:

The interaction of two-dimensional vortex flows with a free surface is studied numerically using a combined vortexboundary integral technique. The vorticity is modeled as point vortices, vortex sheets and finite area vortex regions. Two problems are studied in considerable detail, the large amplitude Kelvin-Helmholtz instability of a submerged shear-layer and the head-on collision of a vortex pair with the free surface. The surface deformation is controlled by a Froude number, based on the vortical motion, and the geometrical parameters describing the initial vortex configuration. Large Froude numbers generally lead to strong interactions for sufficiently shallow vortices.

Subject Categories:

  • Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE