共查询到19条相似文献，搜索用时 93 毫秒
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迎风有限元法在三维潮流数值模拟中的应用 总被引：4，自引：0，他引：4
为研究和开发迎风有限元法在河口海岸三维波数值模拟中的应用，并为建立三维物质扩散模型，最终为解决实际工程问题打下基础，以非线性浅水波方程为基础，采用一咱平面迎风有奶元与垂向工有限差分相结合地数值计算方法建立三维潮流数学模型，基地实际的物理过程，在计算中将三维流动分成外重力波和内重力波，耦联求解潮位和流速的空间分布。应用本模式计算了天津新港附近渤海海域的三维潮流运动，以较高的分辩率揭示了潮流空间结构特 相似文献
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胶州湾三维变动边界的潮流数值模拟 总被引：35，自引：3，他引：35
基于Blumberg等（1986）的河口、陆架和海洋模式，引入变边界处理技术，建立了胶州湾三维变动边界的潮流模型，模型以σ-正交曲线坐标下三维非线性潮波方程为基本方程，引入2.5阶瑞封闭方程组，采用分裂算子法数值求解方程组，利用湍封闭方程求解垂直紊动粘滞系数，采用干湿网格方法模拟潮流漫滩过程，三维变动边界潮流模型计算结果与实测值吻合良好。 相似文献
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海岸三维潮流数学模型的研究及应用 总被引：4，自引：0，他引：4
本模型以三维Navier－Stokes方程为基础,经σ-坐标变换得模式方程,然后选用特殊的插值函数,利用有限元和差分相结合的方法求解.所建模型可适应具有较为复杂岸线和海工建筑的海域潮流计算,可进行局部加密,同时能以较高分辨率揭示三维潮流的空间结构特征.本潮流模型具有省时、简便的特点. 相似文献
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杭州湾的三维水流数值模拟 总被引：2，自引：1，他引：2
建立了一个基于σ变换和内外模式分裂技术三维水流数学模型，采用有限节点法（平面）和变步长差分法（σ向）对方程进行了离散；通过风生流和环岛水流两个理论模式对所建模型进行了校验，并将该模型应用到杭州湾的三维水流数值模拟中，效果良好，所建模型垂向分辨率高，简单实用，可应用于河口，海岸，湖泊等大范围水域的水流数值计算。 相似文献
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二维各向异性介质中三分量波动方程有限元法模拟 总被引：1，自引：0，他引：1
利用六面体单元和三线性插值函数 ,推导出在任意弹性各向异性介质中三维三分量波动方程所满足的有限元方程 ,同时给出也适用于矩形单元和双线性插值的二维三分量各向异性介质中的波动方程模拟的一般性公式 ,最后讨论两个数值模拟的结果。 相似文献
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In this paper, a numerical model is established for estimating the wave forces on a submerged horizontal circular cylinder. For predicting the wave motion, a set of two-dimensional Navier-Stokes equations is solved numerically with a finite element method. In order to track the moving non-linear wave surface boundary, the Navier-Stokes equations are discretized in a moving mesh system. After each computational time step, the mesh is modified according to the changed wave surface boundary. In order to stabilize the numerical procedure, a three-step finite element method is applied in the time integration. The water sloshing in a tank and wave propagation over a submerged bar are simulated for the first time to validate the present model. The computational results agree well with the analytical solution and the experimental data.Finally, the model is applied to the simulation of interaction between waves and a submerged horizontal circular cylinder.The effects of the KC number and the cylinder depth on the wave forces are studied. 相似文献
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Numerical simulation of sloshing waves in a 3D tank based on a finite element method 总被引：8，自引：0，他引：8
The sloshing waves in a three dimensional (3D) tank are analysed using a finite element method based on the fully non-linear wave potential theory. When the tank is undergoing two dimensional (2D) motion, the calculated results are found to be in very good agreement with other published data. Extensive calculation has been made for the tank in 3D motion. As in 2D motion, in addition to normal standing waves, travelling waves and bores are also observed. It is found that high pressures occur in various circumstances, which could have important implications for many engineering designs. 相似文献
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基于高阶边界元的三维数值波浪港池--波浪破碎的模拟 总被引：5，自引：1，他引：4
在势流理论的框架内,采用高阶边界元方法和混合欧拉-拉格朗日法,实现了对三维波浪破碎过程的数值模拟.数值模型使用可调节时间步长的基于二阶显式泰勒展开的混合欧拉-拉格郎日时间步进来求解自由表面的演化过程.在所使用的边界元方法中,采用16节点三次滑移四边形单元来表示,这种单元在单元内具有高阶的精度同时在单元之间具有良好的连续性.给出了孤立波的传播和周期性非线性波浪沿缓坡传播的计算结果,表明数值模型具有良好的稳定性. 相似文献
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LI Yucheng CHEN Bing LAI Guozhang Professor Dept. of Civil Engineering Dalian University of Technology Dalian P. R. China.Ph. D. Candidate Dept. of Civil Engineering Dalian University of Technology Dalian P. R. China.Professor Dept. of Engineering Mechanics Dalian University of Technology Dalian P. R. China. 《中国海洋工程》1998,(2)
A three-step finite element method(FEM)together with Large Eddy Simulation(LES)is ap-plied to incompressible turbulent flow around seabed pipelines at relatively high Reynolds numbers.Bothtwo-dimensional and three-dimensional numerical simulation is carried out to determine thethree-dimensional effect.The results of numerical simulation agree quite well with the wave forces actingon pipeline models measured in physical model test. 相似文献
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为深入研究太平洋中尺度涡的三维结构特征,解决常规一维剖面和二维平面图对温盐空间分布规律分析不足的弊端,文章在三维结构合成分析的基础上首次引入Voxler平台,建立太平洋中尺度涡温盐要素的三维数据模型,实现太平洋中尺度涡三维结构的可视化表达,利用历史观测数据合成的太平洋中尺度涡三维结构,对温盐结构特征进行直观的全空间三维分析。研究结果表明:太平洋反气旋涡温度异常的主体结构深度约200m,呈鹅卵石状,涡旋结构可维持到1 000m;盐度异常的主体结构深度约300m,呈水平扁平水滴状,涡旋结构仅维持约800m;与盐度异常的三维结构相比,温度异常结构较复杂,且涡旋结构更明显,到达深度也更深,即温度受中尺度涡的影响更显著。 相似文献
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Numerical solutions for the hydroelastic problems of bodies are studied directly in the time domain using Neumann–Kelvin formulation. In the hydrodynamic part of problem, the exact initial boundary value problem is linearized using the free stream as a basis flow, replaced by the boundary integral equation applying Green theorem over the transient free surface Green function. The resultant boundary integral equation is discretized using quadrilateral elements over which the value of the potential is assumed to be constant and solved using the trapezoidal rule to integrate the memory or convolution part in time. In the structure part of the problem, the finite element method is used to solve the hydroelastic problem. The Mindlin plate as a bending element, which includes transverse shear effect and rotary inertia effect are used. The present numerical results show acceptable agreement with experimental, analytical, and other published numerical results. 相似文献
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The two-dimensional nonlinear time domain free surface flow problem is analysed using potential flow theory. The problem is solved by a time marching method. At each time step two numerical approaches are used. One is based on the boundary element method in the complex plane. The complex potential is assumed to vary linearly within each element and the solution is obtained by imposing the boundary conditions at the nodes of the elements. The other approach is based on the finite element formulation. Triangular elements and linear shape functions are used. The solution is obtained by the Galerkin method. Numerical results are obtained for the wave elevation generated by a vertical wave maker. Results are also provided for a circular cylinder oscillating below the free surface. For these cases the finite element method is found to provide substantially more efficient computations than the boundary element method using equivalent discretizations. 相似文献