Research and development of hydro-elastic and hydrodynamic responses of ship running in rough seas

船舶在波涛汹涌的海面运行的水弹性和水动力响应研究与发展

• 批准号: 17206088
• 负责人: TAKIZAWA Katsuji
• 金额: $ 30.78万
• 依托单位: National Maritime Research Institute
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 2005
• 资助国家: 日本
• 起止时间: 2005 至 2007
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-17206088/
• 关键词: CIP; Conservative IDO; MPS; Ship Responses in waves; Slamming; Shipping water; Sloshing; Hydro-elastic responses; IDO法; 波浪衝撃; 海水打込み

The CIP based CCUP method and the adaptive Soroban grid technique were combined for computation of 3D fluid-object and fluid-structure interactions in the presence of free surfaces and fluid-fluid interfaces. The combined technique is extended to ship hydrodynamics computations. The technique has a number of desirable features. The CIP method brings superior accuracy in computation of the advection terms. The Soroban grid technique, because of its unstructured nature, brings geometric flexibility and makes it possible to generate suitable grids around complex shapes. Even with this geometric flexibility, because the Soroban grid techniques has a very simple data structure, the combined technique is computationally efficient. Also, because the Soroban grid technique does not have any elements or cells connecting the grid points, it is free from mesh distortion limitations. The combined technique can accurately resolve the boundary layers near the ship surface and also calculate, in a ro … More bust and accurate fashion, the complex and unsteady free surfaces. We also introduced a new way of calculating the advective terms with increased computational efficiency. The enhanced efficiency makes the combined technique even more competitive in ship hydrodynamics computations. To show the capability of this method, simulations of realistic hydrodynamics of a running container ship in rough seas were conducted.Next, we have developed the conservative form of the IDO (IDO-CF) scheme, In the IDO-CF scheme, cell-integrated values and point values of the mass, the momentum, and the energy are time-integrated by solving coupled conservation equations. The time integration of the cell-integrated values is described in the flux form and the cell-integrated values are exactly conserved. Fourier analyses for advection, diffusion, and Poisson equations show that the IDO-CF scheme retains as high resolution property as the IDO-NCF scheme. The effectiveness of the proposed scheme in solving compressible fluid dynamics is confirmed in the solutions of Riemann problems. The IDO-CF scheme also provides highly resolved solutions for incompressible fluid dynamics as shown in DNS of turbulent flow and lid-driven cavity flow. In comparison with the IDO-NCF scheme, the IDO-CF scheme has advantages not only in conservation but also in numerical velocity-pressure coupling While the IDO-NCF scheme needs to introduce special discretizations for stable coupling, in the IDO-CF scheme, the automatically staggered configuration between the cell integrated values and the point values provides stable coupling without any special discretizations. These advantages lead to superior results for both the compressible and incompressible flow problems The proposed scheme can be extended to the three-dimensional formulation straightforwardly, where volume integrals are introduced as the conservative cell-integrated values. The exactly conservation, high resolution, and high stability features of the IDO-CF scheme immensely promises in advanced compressible and incompressible fluid dynamics studies.A new ship motion model by MPS method was also developed for high wave height conditions where green water occurs. Ship was treated as a rigid body. The interaction between the ship and waves was calculated on the basis of weak coupling. The advantages of this model are as follows: (1) The effect of shipping water is considered. (2) Rotation angle is not restricted. (3) Six degrees of freedom motion can be simulated. (4) Moving ship surface can be easily handled. A numerical wave tank was developed to create a series of waves. This numerical wave tank involves inflow and outflow boundaries. It was shown that the numerical wave tank was useful to reduce the calculation cost. The coupling between ship motion and green water on deck was calculated by using the developed ship motion model and numerical wave tank. The calculation was three-dimensional. Ship motions were calculated in five typical wave conditions. The calculated ship motions were compared with the experimental data quantitatively. As the result, it was shown that the MPS results were closer to the experiment than the ordinary linear method, New Strip Method. From these results, it can be said that the MPS method will be able to predict the ship motion in very rough seas where shipping water occurs. Less

将基于CIP的CCUP方法和自适应Soroban网格技术组合在一起，以计算3D流体对象和流体结构相互作用，并在自由表面和流体 - 流体界面的存在下进行计算。组合技术扩展到船舶流体力学计算。该技术具有许多理想的功能。 CIP方法在计算广告术语的计算方面具有卓越的准确性。 Soroban网格技术由于其非结构化的性质，带来了几何柔韧性，并可以在复杂形状周围产生合适的网格。即使有了这种几何灵活性，由于索罗博人网格技术具有非常简单的数据结构，因此组合技术在计算上是有效的。另外，由于索罗博人网格技术没有连接网格点的任何元素或单元格，因此它没有网格失真限制。合并的技术可以准确地解决船体表面附近的边界层，并以RO……更加胸围和准确的方式计算复杂且不稳定的自由表面。我们还引入了一种以提高计算效率来计算高级术语的新方法。提高效率使组合技术在船舶流体力学计算中更具竞争力。为了展示这种方法的能力，进行了粗糙海洋中运行的容器船的逼真的流体动力学的模拟。下一步，我们在IDO-CF方案，细胞整合的值和质量，动量，动量和能量的元素和点值的保守形式（IDO-CF）方案中开发了保守的形式。细胞集成值的时间整合以通量形式描述，细胞积分值是完全保守的。傅立叶对广告，扩散和泊松方程的分析表明，IDO-CF方案与IDO-NCF方案保持高分辨率属性。在黎曼问题的解决方案中证实了所提出的方案在解决可压缩流体动力学方面的有效性。 IDO-CF方案还为不可压缩的流体动力学提供了高度解析的溶液，如湍流和盖子驱动的腔流量所示。与IDO-NCF方案相比，IDO-CF方案不仅在保护方面具有优势，而且在数值速度压力耦合方面也具有优势，而IDO-NCF方案需要在IDO-CF方案中引入特殊的稳定耦合，以自动划配置在IDO-CF方案中自动裁缝，而不必为端口值提供任何端口值。这些优势导致了可压缩和不可压缩流问题的优势结果。所提出的方案可以直接扩展到三维公式，其中将体积积分作为保守的细胞集成值引入。 IDO-CF方案的确切保护，高分辨率和高稳定性特征在高级可压缩且不可压缩的流体动力学研究中非常有望。船被视为僵硬的身体。船与波之间的相互作用是根据弱耦合计算的。该模型的优点如下：（1）考虑运输水的影响。 （2）旋转角度不受限制。 （3）可以模拟六个自由度运动。 （4）可以轻松处理移动的船体表面。开发了一个数值波罐，以创建一系列波浪。该数值波罐涉及流入和出口边界。结果表明，使用开发的船舶运动模型和数值波罐计算甲板上船舶运动和绿色水之间的耦合。计算是三维的。在五个典型的波条件下计算船舶运动。定量将计算出的船舶运动与实验数据进行了比较。结果，结果表明，MPS结果比普通线性方法（新的条形方法）更接近实验。从这些结果中可以说，MPS方法将能够在发生水水的非常粗糙的海洋中预测船舶运动。较少的

项目成果

Challenge of CIP as a universal solver for solid, liquid and gas

• DOI: 10.1002/fld.830
• 发表时间: 2005-02-28
• 期刊: INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN FLUIDS
• 影响因子: 1.8
• 作者: Yabe, T;Takizawa, K;Chu, CC
• 通讯作者: Chu, CC

Validation of CIP-based Method for Strongly Nonlinear Wave-Body Interactions

基于 CIP 的强非线性波体相互作用方法的验证

• 发表时间: 2012
• 期刊: Proc. of 2nd International Conference on Violent Flows
• 作者: Changhong Hu;Cheng Liu and Masashi Kashiwagi
• 通讯作者: Cheng Liu and Masashi Kashiwagi

Recent Advance of Multi-Phase Flow Computation with the Adaptive SOROBAN-Grid Cubic Interpolated Propagation(CIP) Method (Keynote Lecture)

自适应SOROBAN网格三次插值传播（CIP）方法多相流计算的最新进展（主题演讲）

• 发表时间: 2006
• 期刊: ICCFD4
• 作者: T.Yabe;Y.Ogata
• 通讯作者: Y.Ogata

Multigrid Technique for Numerical Simulations of Water Impact Phenomena

水冲击现象数值模拟的多重网格技术

• 发表时间: 2006
• 期刊: International Journal of Offshore and Polar Engineering 16・4
• 作者: Nishi;Y.;Hu;C-H.and Kashiwagi;M.
• 通讯作者: M.

Higher-order multi-phase flow solver in mesh-less-like Soroban scheme(Invited paper)

无网格Soroban方案中的高阶多相流求解器（特邀论文）

• 发表时间: 2005
• 期刊: Proc.of the 8th US National Congress on Computational Mechanics
• 作者: T.Yabe;K.Takizawa and T.Tezduya
• 通讯作者: K.Takizawa and T.Tezduya