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2011•Acta ArmamentariiRequires access

Numerical Calculation of Ship Wake and Its Bubble Number Density Distribution

Rao Jiong-hui

Open publisher page 3 citations

Abstract

As the detective object for an underwater weapon platform,the ship wake and its bubble number density(BND) distribution are studied.The modified Reynolds-averaged Navier-Stokes fluid dynamical model and the bubble transport theory are taken to establish a numerical model to calculate the wake BND distribution,and the model is verified by measurement data.The study results show that the wake flow expands along the wake in a small angle while its depth increases greatly,by about 2 times at location of 3000m behind the stern.And the total BND decreases along the wake flow with the increase of distance from the stern.However,in near field,the total BND attenuates rapidly while slowly in far field.The total BND in the eddy flow area behind propellers of the ship is much higher than those in other locations.The bubbles with radius between 10μm and 200μm survive for the longest time in the ship wake.

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What this paper is about

As the detective object for an underwater weapon platform,the ship wake and its bubble number density(BND) distribution are studied.The modified Reynolds-averaged Navier-Stokes fluid dynamical model and the bubble transport theory are taken to establish a numerical model to calculate the wake BND distribution,and the model is verified by measurement data.The study results show that the wake flow expands along the wake in a small angle while its depth increases greatly,by about 2 times at location of 3000m behind the stern.And the total BND decreases along the wake flow with the increase of distance from the stern.However,in near field,the total BND attenuates rapidly while slowly in far field.The total BND in the eddy flow area behind propellers of the ship is much higher than those in other locations.The bubbles with radius between 10μm and 200μm survive for the longest time in the ship wake.

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Available abstract

As the detective object for an underwater weapon platform,the ship wake and its bubble number density(BND) distribution are studied.The modified Reynolds-averaged Navier-Stokes fluid dynamical model and the bubble transport theory are taken to establish a numerical model to calculate the wake BND distribution,and the model is verified by measurement data.The study results show that the wake flow expands along the wake in a small angle while its depth increases greatly,by about 2 times at location of 3000m behind the stern.And the total BND decreases along the wake flow with the increase of distance from the stern.However,in near field,the total BND attenuates rapidly while slowly in far field.The total BND in the eddy flow area behind propellers of the ship is much higher than those in other locations.The bubbles with radius between 10μm and 200μm survive for the longest time in the ship wake.

Key concepts: Wake, Bubble, Physics, Reynolds number, Mechanics, RADIUS, Stern, Flow (mathematics)

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