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目前使用的船舶有很大的不同。因此，将采用更多创新的设计理念来设计具有更高性能和整体运营效益的船舶。在这种船体形式的设计中，在过去50年中开发的当前设计数据库中的大部分不直接适用。由于通过模型研究快速扩展设计数据库的成本过高，因此开发基于模拟的设计工具的动机很强，这些工具能够减少或消除对模型规模试验和将结果外推到全尺寸的需要。这是计算流体力学（CFD）进一步发展的重要背景;然而，许多CFD方法，尤其是基于雷诺平均Navier-Stokes（RaNS）方程的方法，全尺寸船舶流场模拟仍然存在困难，本文研究了在全尺寸Rn下并考虑近尺度情况下船舶粘性流场模拟的计算方法包括表面粗糙度影响的壁流模型。本文的主要目的有两个：（1）发展适用于全尺寸流动模拟的RaNS方程方法;（2）研究适用于全尺寸Rn的物理模型。特别是，两点壁面函数方法的有效性和优点已被研究和扩展，包括表面粗糙度对流动和阻力的影响。目前的M1尺度船舶流场数值模拟方法是在前人研究的基础上发展起来的，即在标准κ-ε模型的基础上，可以采用两种近壁模型，一种是近壁模型，另一种是近壁模型。例如，两层法和两点壁面函数法，能考虑表面粗糙度的影响，后者在实际设计中更适用。

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, 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。

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。