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首页> 外文期刊>Ocean Engineering >Application of a BEM time stepping algorithm in understanding complex unsteady propulsion hydrodynamic phenomena
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Application of a BEM time stepping algorithm in understanding complex unsteady propulsion hydrodynamic phenomena

机译:BEM时间步长算法在理解复杂的非定常推进水动力现象中的应用

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We solve the problem of unsteady potential flow around a system of arbitrarily moving rigid or flexible, lifting or non-lifting bodies, in an infinite fluid free of distributed vorticity. For the solution we use a time stepping algorithm and a potential based formulation of the corresponding free BVP. Nonlinear free shear layer dynamics are included in our modeling. This is a major innovation in treating complex unsteady propulsion problems since no simplifying assumptions (like that of a helicoidal wake) are used regarding the wake model. Bilinear quadrilateral elements are used to describe body and shear layer geometry at each time t. Three types of Kutta conditions can be alternatively applied for the determination of the shed vorticity from lifting bodies. The theoretical and numerical aspects of the method are presented followed by a number of applications, elucidating the qualitative and quantitative physical characteristics of a number of complex unsteady propulsion problems.
机译:我们解决了在无分布涡旋的无限大流体中,任意移动的刚性或柔性,举升或非举升物体周围系统的不稳定流量的问题。对于解决方案,我们使用时间步长算法和相应自由BVP的基于势的公式表示。非线性自由剪切层动力学包括在我们的模型中。这是在处理复杂的非平稳推进问题方面的一项重大创新,因为未使用关于尾流模型的简化假设(如螺旋尾流的假设)。双线性四边形元素用于描述每个时间t的主体和剪切层几何形状。可以使用三种类型的Kutta条件来确定举升体的流下涡度。提出了该方法的理论和数值方面,随后进行了许多应用,阐明了许多复杂的非定常推进问题的定性和定量物理特性。

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