模型船船尾まわりの乱動計測 : 龍光丸, ハンブルグテストケース(HTC)

概要

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Turbulnce measurements in stern flow fields around ship models were carried out by using triple-sensor hot wire system in the wind tunnel. The mean velocities and turbulent quantities include dissipation ratio were analyzed from the time history data of the 3-component of fluctuating velocities, and detailed stern flow databases were obtained. An evaluation of K-ε turbulence model was carried out using measured data of "Ryuko-Maru" at propeller section. From the investigation of turbulent kinetic energy balance, an assumption of local equilibrium is not effective in the stern flow field. An expression of eddy-viscosity was derived from turbulent kinetic energy transport equation and the distribution was calculated from measured data. It is found that the distribution was very similer to that of Shih-Lumley model. Reynolds stresses estimated by the leading term of Shin-Lumley model show good agreement with measured data. The "standard" transport equations of turbulent kinetic energy and dissipation ratio were examined to substitute measured data into these equations, residuals of the transport equations took large value in the high shear region of axial velocity.
社団法人日本船舶海洋工学会の論文
1998-09-25