The body would dive into duct near water intake when it was entering into the water. To numerically study the body water-entry and dive, combined the volume of fluid (VOF) method with dynamic mesh, the cylinder water-entry and water-out with different density was simulated by the Fluent module. The free surface deformation, bottom height and vertical velocity caused by cylinder water-entry and water-out were verified. The cases of cylinder water-entry and dive into water intake with different initial momentum conditions were researched in case of water-entry and water-out combining with two-dimensional water channel. Numerical results show that the specific pro-cess of cylinder water-entry and water-out could be simulated accurately by the module, and initial momentum is the key factor on the cylinder diving into duct after entering into the water. Numerical results provide the analysis basis for judging whether the body dives into water intake.%漂浮物体在取水口附近入水后可能会下潜至涵道,为数值研究其入水-下潜过程,基于计算流体力学模型中的VOF法,并结合动网格方法,首先构建了不同密度圆柱体的自由入水以及出水过程,验证了物体出入水过程造成的射流、入水深度及物体速度变化;其次结合二维明渠的取水过程模拟了不同初始动量条件下圆柱体的入水-下潜过程.结果表明:文章建立的入水-出水数值模型可很好地刻画二维圆柱体入水及出水的具体过程,且初始动量大小是圆柱体在入水后能否下潜至取水涵道的关键因素,数值结果为判断取水口附近物体入水后的下潜风险提供了分析依据.
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