AbstractA computational fluid dynamics approach to study drag reduction of axisymmetric underwater bodies by air jet injection in the boundary layer is presented. The well-known ‘mixture’ model is used to capture the multiphase flow and the SST k-ω (shear stress transport) turbulence closure model has been used in the computations. Well-studied Afterbody1 (Huang et al., 1978) which has a tapered and smooth stern profile is considered. A companion shape of Afterbody1, which has a blunt stern profile, is also studied. The numerical study is carried out with different air jet velocity to body velocity ratios, various angles of air jet and various angles of attack of the body. Effects of these parameters on drag reduction are reported. The effect of tapered vs. blunt aft shape of Afterbody1 has been found to have significant effect on drag reduction performance.
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机译：摘要提出了一种计算流体动力学方法来研究边界层中空气喷射对轴对称水下物体减阻作用。众所周知的“混合”模型用于捕获多相流，计算中使用了SSTk-ω（剪切应力传递）湍流闭合模型。研究充分的Afterbody1（Huang et al。，1978）具有锥形且光滑的船尾轮廓。还研究了具有钝尾轮廓的Afterbody1的伴随形状。在不同的空气喷射速度与人体速度比，不同的空气喷射角度和身体的不同迎角下进行了数值研究。报告了这些参数对减阻的影响。已发现Afterbody1的锥形与钝尾形状对减阻性能具有显着影响。
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