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Pressure Distributions Around Submarine and Ship Hulls
| 题名： | Pressure Distributions Around Submarine and Ship Hulls |
| 作者： | (Zhrister Fureby and Niklas Alin |
| 关键词： | Navier-Stokes Equations, Large Eddy Simulations, Two-phase fluid with free surface |
| 摘要： | This report describes an emerging computational capability for physics.based flow simulation and maneuvering predictions for appended submarine and ship-hull geometries. Because of the high Reynolds number, complex geometry and physics of such flows a novel simulation model, that depending on the level of resolution, automatically adjusts to a Reynolds Average Simulation (RAS), Large Eddy Simulation (LES) or a Direct Numerical Simulation (DNS) model is proposed. The model is derived from the Navier Stokes equations using low-pass filtering, and should be closed using subgrid turbulence models that are formally tied to Reynolds stress models in the high Re/coarse grid limit. In this study we have used a tensor-valued anisotropic eddy-viscosity model. This model, initially developed for invompressible flows and described elsewhere, have here been extended to free surface flows to handle the flow around ship-hulls. Applications discussed in this study include the flow around a fully appended submarine and the flow around the hull of the Swedish minesweeper Styrso. Comparison with experimental data indicate very good qualitative and quantitative agreement. This capability will enanble new complex simulations in computational naval hydrodynamics that can support submarine and ship design as well as provide understanding leading to reduced hydroacoustic emissions and improved manoeuvering capabilities for vehicles undergoing complicated manoeuvres. |
| 报告类型： | 科技报告 |
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