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An overview of flow field computational methods for hydrodynamic noise prediction

Journal of Hydrodynamics 2022年第6期34卷 994-1005页

作者： Wei-wen Zhao Zhi Pan Lian-jie Yu De-cheng Wan Computational Marine Hydrodynamics Lab(CMHL) School of Naval ArchitectureOcean and Civil EngineeringShanghai Jiao Tong UniversityShanghai200240China Wuhan Second Ship Design and Research Institute Wuhan430205China

Recently,the hydrodynamic noise is becoming a research hotspot because it not only affects the concealment and comfort of ships,but also affects the living condition of underwater *** prediction of hydrodynamic noise requires that the detailed flow field has been simulated temporally and spatially with high fidelity *** this paper,we introduce the current issues and challenges for the prediction of hydrodynamic noise,and provide an overview to several detailed flow field simulation methods which aim to resolve these *** overview could point the future directions for hydrodynamic noise prediction.

关键词： Hydrodynamic noise turbulent fluctuation wall-bounded flow two-phase flow noise reduction

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Stochastic formulation of particle kinetics in wall-bounded two-phase flows

引用

Science China(Technological Sciences) 2014年第10期57卷 2001-2011页

作者： MA HongBo FU XuDong State Key Laboratory of Hydroscience and Engineering Department of Hydraulic Engineering Tsinghua University

This paper presents a generalized framework of stochastic modeling for particle kinetics in wall-bounded *** modified a reflected Brownian motion process and straightforwardly obtained a Kramers equation for particle probability density function(PDF).After the wall effects were accounted for as a drift from zero in the mean displacement and suppression in the diffusivity of a particle,an analytical solution was worked out for *** distinguishable mechanisms were identified to affect the profile of particle probability distribution:external forces,turbophoresis effect,and wall-drift *** proposed formulation covers the Huang et al.(2009)model of a wall that produces electrostatic repulsion force and van der Waals force,as well as Monte-Carlo solutions for the Peter and Barenbrug(2002)model under a variety of relaxation ***,it successfully reproduces the two patterns of particle concentration profiles observed in experiments of sediment-laden open-channel *** strength of the wall-drift effect was found to be connected with the interaction frequency between particle and *** exploration of the relationship among flow turbulence,particle inertia,and particle concentration is worthwhile.

关键词： stochastic formulation Kramers equation reflected Brownian motion wall-bounded flow two-phase flow concentration profile

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