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Numerical investigation of a stepped planing hull in calm water

机译：平静水中阶梯状滑行船体的数值研究

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Stepped planing hulls enable the feasibility of running at relatively low Drag-Lift ratio by means of achieving more optimal trim angle at high speeds. Currently, there is no precise method to analyze these hulls over the full range of operating speeds. In this study, a three-dimensional computational fluid dynamics (CFD) model using volume of fluid (VOF) approach is presented for examining the characteristics of a planing hull having one transverse step. A procedure is presented to transform a series of fixed-position simulations into a free to heave and pitch simulation. Resistance, lift, running draft, dynamic trim angle, and wetted area are compared with available experimental data and those of a semi-empirical method at volumetric Froude number in the range of 2.41-7.12. Centerline wake profile and reattachment location are compared with those of empirical equations. Wetted area at forebody chines-dry mode is qualitatively compared with a typical under water photograph of a stepped hull. The quantitative and qualitative results are found in acceptable correlation with experimental data, hence they can be reliably used in the stepped hull hydrodynamic investigation.
机译：阶梯式滑行船体通过在高速下实现更佳的修整角，从而实现了在相对较低的阻力比下行驶的可行性。当前，没有精确的方法可以在整个运行速度范围内分析这些船体。在这项研究中，提出了一种使用流体体积（VOF）方法的三维计算流体动力学（CFD）模型，用于检查具有一个横向台阶的滑行船体的特性。提出了将一系列固定位置模拟转换为自由起伏和俯仰模拟的程序。将阻力，升力，行驶吃水，动态纵倾角和湿润面积与可用的实验数据以及半经验方法在体积弗劳德数在2.41-7.12范围内的数据进行比较。将中心线尾迹轮廓和重新连接位置与经验方程式进行比较。定性地将前躯干模式下的湿润区域与典型的阶梯船体水下照片进行了比较。发现定量和定性结果与实验数据具有可接受的相关性，因此它们可以可靠地用于阶梯式船体水动力研究。

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