Undersea Fluid/structure Coupling Methodology
Author(s)
A. Wardlaw, T. McGrath & J. A. Luton
Abstract
Prediction of the response of submerged structures to underwater explosions
requires a coupled fluid-structure analysis. This is a consequence of the stiffness
of water. Structure deformation modifies the pressure in the surrounding fluid,
changing the pressure loading. Coupling is accomplished by running both
simulations as separate processes that communicate after each fluid integration
step. The fluid solution is carried out on a fixed Cartesian product grid, which
does not coincide with the body surface. Geometry routines included in the
Euler module determine which fluid cells are in the water, in the structure and
intersected by the structure surface. A modified stair-step boundary treatment
that accounts for local surface motion and orientation represents the body surface
without introducing a complicated data structure or restricting integration step
size. This approach can accommodate thick singly wetted, or thin doubly wetted,
surfaces. The latter are common in marine structures that have thin, fluid backed
surfaces. Computational examples are presented that include shock loading of
stiffened and unstiffened cylinders, a barge and a ship model.
Keywords: UNDEX FSI coupling fluid-structure.
1 Introduction
Simulating the response of submerged structures to underwater shocks requires a
coupled fluid-structure calculation. The initial shock load on such structures
causes them to deform, which results in an immediate unloading [1]. Water is
relatively stiff and deformation forces it to fill additional volume near the
structure’s surface – this lowers its density and diminishes its pressure.
The water adjacent to a deforming surface may cavitate if the deformation is
rapid and extensive.
A variety of methods have been proposed to predict underwater explosion
damage to structures. Methods based on the doubly asymptotic approximation
Keywords
UNDEX FSI coupling fluid-structure.
Related Book
Other papers in this volume
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