Date: 10/31/08

Speaker: Dr. K. Hendrickson

Title: Models for Simulating Breaking Waves in Computational Ship Hydrodynamics

Abstract:
Models for use in large-scale computational ship hydrodynamics (CSH)
are developed with the support of direct numerical simulations (DNS)
of small-scale breaking waves using a fully-coupled, air-water
interface via a modified level set method. An ensemble of
high-resolution DNS of unsteady and quasi-steady breaking waves are
performed, and the kinematics and dynamics of the quasi-steady
breaking waves for both the air and water are discussed. The
performance of available multiphase formulations and closure models
of large-scale applications are analyzed using the DNS data sets to
assess their applicability to CSH. Three frameworks for unsteady
Reynolds-averaged Navier--Stokes (URANS) simulations are discussed.
Two frameworks for simulating large-scale breaking waves with
large-eddy/large-wave simulations (LES/LWS) are also analyzed in an
\textit{a priori} fashion using traditional subgrid scale models.
Three potential breaking criteria are also proposed for use in
potential flow simulations that have been developed from analysis of
the DNS data sets. The results in this work lay the foundation for
physics-based simulation of large-scale computational ship
hydrodynamics.