Development of Computational Method for Calculating Ship Viscous Flow at Full-Scale Reynolds Number

船舶全尺寸雷诺数粘性流计算方法的发展

• 批准号: 12650903
• 负责人: TAHARA Yusuke
• 金额: $ 2.3万
• 依托单位: Osaka Prefecture University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2000
• 资助国家: 日本
• 起止时间: 2000 至 2001
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-12650903/
• 关键词: Computational Fluid Dynamics; Full-Scale Reynolds Number; Near-Wall Flow Model

Ship designs in next generation will be dramatically different from those currently in use. As such, more innovative design concepts will be applied for design of ships with higher performance and overall operation benefit. In the design of such hull forms, much of the current design database, which has been developed over the past 50 years is not directly applicable. Since it will be prohibitively expensive to quickly expand the design database through model studies, there is strong motivation to develop simulation-based design tools, which are able to diminish or eliminate need for model-scale tests and extrapolation of the results to full scale. This is an important background of further development of Computational Fluid Dynamics (CFD) ; however many CFD methods especially for those based on Reynolds-averaged Navier-Stokes (RaNS) equation method, still suffer difficulties in full-scale ship-flow simulation.The present study concerns development of computational method for simulation of ship viscous flow at full-scale Rn in conjunction with consideration of near-wall flow modeling including surface roughness effects. The main objectives are two folds : (1) development of RaNS equation method applicable to full-scale flow simulation; and (2) investigation on appropriate physical model for full-scale Rn. In particular, the validity and advantage of two-point wall-function approach^<3)> has been investigated and extended for inclusion of surface roughness effects on flow and resistance. The present numerical method for Mi-scale ship-flow simulation is based on extension of method developed by the present investigators, such that, in association with standard κ-ε model, two near-wall models can be employed, i. e., two-layer method and two-point wall-function method with capability to include surface roughness effects, where the latter has been shown more suitable in practical design use.

下一代的船舶设计将与当前使用的船舶设计不同。因此，将采用更具创新的设计概念，用于具有更高性能和整体操作优势的船舶的设计。在此类船体形式的设计中，过去50年来开发的当前设计数据库都不适用。由于将禁止通过模型研究快速扩展设计数据库，因此有强大的动机来开发基于模拟的设计工具，这些工具能够减少或消除对模型尺度测试的需求，并将结果推断到全面。这是计算流体动力学进一步发展（CFD）的重要背景；然而，许多CFD方法尤其是针对基于雷诺平均的Navier-Stokes（RANS）方程方法的方法，在全尺寸的船舶流量模拟中仍然遇到困难。当前的研究涉及计算方法开发用于模拟船舶粘性流量在全尺度RN中与近尺度RN结合结合使用的近尺度RN与近壁流量模型的相结合。主要目标是两个折叠：（1）开发适用于全尺度流量模拟的等式方法； （2）对全面RN的适当物理模型进行投资。特别是，已经研究并扩展了两点壁功能方法的有效性和优势，以包括表面粗糙度对流动和电阻的影响。目前用于MI级船流仿真的数值方法基于本研究人员开发的方法的扩展，因此，与标准κ-ε模型相关联，可以雇用两个近壁模型，即，两层方法和两点壁式方法与功能具有更适合于实践设计的表面粗糙度效应，以包括表面粗糙度效应。

项目成果

Tahara, Y., Himeno, Y.: "Simulation of Viscous Flow around a Ship Hull Form at Full Scale Reynolds Number"Proc. International Conference for Hydrodynamics. (2002)

Tahara, Y., Himeno, Y.：“全尺寸雷诺数下船体周围粘性流的模拟”Proc。

Tahara Y., Katsui T. and Himeno Y.: "Simulation of Ship Viscous Flow at Full Scale Reynolds Number"Proc. 5th International Conference on Hydrodynamics, Tainan, Taiwan. (2002)

Tahara Y.、Katsui T. 和 Himeno Y.：“全尺寸雷诺数下船舶粘性流的模拟”Proc。

Tahara, Katsui, Himeno: "Simulation of Ship Viscous Flow at Full Scale Reynolds Number"Proc. Fifth International Conference on Hydrodynamics, Tainan, Taiwan,. (2002)

Tahara、Katsui、Himeno：“全尺寸雷诺数下船舶粘性流的模拟”Proc。