Visiometrics and modeling for ship design and vortex flows

VISIOMETRICS INTERFACE FOR SHIP DESIGN

Description

3D visiometrics interface has been developed that allows the user to interactively observe the ship motions. These displays are coupled to 3D phase space-time diagrams that provide insight into the nature of the solution of the differential equations governing the ship motions. The 3D interface is complemented by the rendering of the time dependent pressure and stress distribution on the hull surface of the ship. Time series are supplemented by other statistical displays like power density spectra (Fourier transform) of heave, pitch and bending moment.

We are currently developing a basic set of tools for visualizing the results of the ship design equations (the profit model combined with the actual fluid dynamics results) and for visualizing the search space -- for parameter optimization. This will enable the designer to understand the effect various parameter changes have on the overall design and how the optimal design can be achieved. These tools will sit in a "mini-environment" tailored for visualizing these types of equations, i.e. will automatically compute many of the visualizations and diagnostics which are useful. The methodology can therefore be used by any other domain with similar modeling requirements. The reduced modeling visiometrics environment which will be developed as part of the ship design is generalizeable to other domains with similar mathematical models. The tools described will be used in determining scaling laws and reduced models of the bending moment with respect to speed, sea amplitude and flare in a restricted space around the Truman and s60_70 geometries for the design optimization studies.

A collateral effort involves the development of parallel hierarchical N-body solvers for vortex flows. The code implemented opens new possibilities for simulating flows about wings, turbulent jets, combustion chambers, free surface/vortex interactions in ship dynamics and other flows in Aero- and Hydrodynamics, which can not be obtained by the traditional Eulerian grid methods (e.g. finite differences). In the near future the code will be applied to exploring and quantifying the role of vortex dynamical processes in generating voiced sound and turbine blade noise. Another field of application will examine the mixing induced by vortices in turbulent jets.

Papers

Note: the HTML version of these papers is still in progress. Some links, figures and images are not yet available

Visualization and quantification interface for diagnosis in ship dynamics
[HTML] [Postscript]

Visiometrics of complex physical processes: Diagnostic vortex dominated flows
[HTML] [Postscript]

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This page last updated: Mon Nov 6 16:26:03 EST 1995