A HYBRID METHOD FOR THE SIMULATION OF WAVE SPECTRUM TRANSFORMATION AND BREAKING PHENOMENA ON A SLOPE

ＡＨＹＢＲＩＤＭＥＴＨＯＤＦＯＲＴＨＥＳＩＭＵＬＡＴＩＯＮＯＦＷＡＶＥＳＰＥＣＴＲＵＭＴＲＡＮＳＦＯＲＭＡＴＩＯＮＡＮＤＢＲＥＡＫＩＮＧＰＨＥＮＯＭＥＮＡＯＮＡＳＬＯＰＥＬｉＹｕ－ｃｈｅｎｇ；ＤｏｎｇＧｕｏ－ｈａｉ（ＤｅｐａｒｔｍｅｎｔｏｆＣｉｖｉｌ...     

APPLICATION OF MILES－HOWARD THEOREM TO STUDY THE INSTABILITY OF ATMOSPHERIC GRAVITY WAVES ON A HETEROGENEOUS ORTHOGONAL SHEAR FLOW

ＡＰＰＬＩＣＡＴＩＯＮ　ＯＦ　ＭＩＬＥＳ－ＨＯＷＡＲＤ　ＴＨＥＯＲＥＭ　ＴＯ　ＳＴＵＤＹ　ＴＨＥ　ＩＮＳＴＡＢＩＬＩＴＹ　ＯＦ　ＡＴＭＯＳＰＨＥＲＩＣ　ＧＲＡＶＩＴＹ　ＷＡＶＥＳ　ＯＮ　Ａ　ＨＥＴＥＲＯＧＥＮＥＯＵＳ　ＯＲＴＨＯＧＯＮＡＬ　ＳＨＥＡＲ...     

APPLICATION OF BODY－FITTED CURVILINEAR COORDINATE TRANSFORMATION IN 3－D SEEPAGE FLOW COMPUTATION

ＡＰＰＬＩＣＡＴＩＯＮＯＦＢＯＤＹ－ＦＩＴＴＥＤＣＵＲＶＩＬＩＮＥＡＲＣＯＯＲＤＩＮＡＴＥＴＲＡＮＳＦＯＲＭＡＴＩＯＮＩＮ３－ＤＳＥＥＰＡＧＥＦＬＯＷＣＯＭＰＵＴＡＴＩＯＮＦａｎｇＦａｎｇ－ｘｉｎ；ＱｉＬｉ；ＣｈｅｎＺｈａｏ－ｈｅ；ＰｅｎｇＹｕ（Ｓｃ...     

NATURAL CONVECTIVE HEAT AND MASS TRANSFER BY THE COUPLING OF TEMPERATURE CRADIENT AND CONCENTRATION GRADIENT IN A POROUS MEDIUM

ＮＡＴＵＲＡＬＣＯＮＶＥＣＴＩＶＥＨＥＡＴＡＮＤＭＡＳＳＴＲＡＮＳＦＥＲＢＹＴＨＥＣＯＵＰＬＩＮＧＯＦＴＥＭＰＥＲＡＴＵＲＥＣＲＡＤＩＥＮＴ　ＡＮＤＣＯＮＣＥＮＴＲＡＴＩＯＮＧＲＡＤＩＥＮＴＩＮＡＰＯＲＯＵＳＭＥＤＩＵＭ￥ＣｈｅｎＢａＯ－Ｍｉｎｇ；Ｆ...     

STOCHASTIC LAYER OF DUFFING''''S EQUATION NEAR ITS SUBHARMONIC RESONANT ORBIT

ＳＴＯＣＨＡＳＴＩＣ　ＬＡＹＥＲ　ＯＦ　ＤＵＦＦＩＮＧ＇Ｓ　ＥＱＵＡＴＩＯＮ　ＮＥＡＲ　ＩＴＳ　ＳＵＢＨＡＲＭＯＮＩＣ　ＲＥＳＯＮＡＮＴ　ＯＲＢＩＴＳＴＯＣＨＡＳＴＩＣＬＡＹＥＲＯＦＤＵＦＦＩＮＧ＇ＳＥＱＵＡＴＩＯＮＮＥＡＲＩＴＳＳＵＢＨＡＲＭＯＮＩ...     

A NEW METHOD FOR SOLVING TURBULENT VELOCITY CORRELATION FUNCTIONS AND ITS APPLICATION TO THE CHANNEL FLOW

ＡＮＥＷＭＥＴＨＯＤＦＯＲＳＯＬＶＩＮＧＴＵＲＢＵＬＥＮＴＶＥＬＯＣＩＴＹＣＯＲＲＥＬＡＴＩＯＮＦＵＮＣＴＩＯＮＳＡＮＤＩＴＳＡＰＰＬＩＣＡＴＩＯＮＴＯＴＨＥＣＨＡＮＮＥＬＦＬＯＷＬｉｎＪｉａｎ－ｚｈｏｎｇ；ＷａｎｇＹｕ－ｚｈｉ（Ｄｅｐａｒｔｍｅｎｔ...     

NUMERICAL COMPUTATION OF THE DIFFUSION OF THE CONTAMINANTS AND THE FLOW FIELD OF SKEW DISCHARGES INTO A CHANNEL

ＮＵＭＥＲＩＣＡＬ　ＣＯＭＰＵＴＡＴＩＯＮ　ＯＦ　ＴＨＥ　ＤＩＦＦＵＳＩＯＮ　ＯＦ　ＴＨＥ　ＣＯＮＴＡＭＩＮＡＮＴＳ　ＡＮＤ　ＴＨＥ　ＦＬＯＷ　ＦＩＥＬＤ　ＯＦ　ＳＫＥＷ　ＤＩＳＣＨＡＲＧＥＳ　ＩＮＴＯ　Ａ　ＣＨＡＮＮＥＬＮＵＭＥＲＩＣＡＬＣＯＭＰＵ...     

A SEPARATED－LAYER FINITE ANALYTIC METHOD FOR NUMERICAL SIMULATION OF A THREE－DIMENSIONAL VISCOUS FLOW FIELD AROUND A SHIP STERN

ＡＳＥＰＡＲＡＴＥＤ－ＬＡＹＥＲＦＩＮＩＴＥＡＮＡＬＹＴＩＣＭＥＴＨＯＤＦＯＲＮＵＭＥＲＩＣＡＬＳＩＭＵＬＡＴＩＯＮＯＦＡＴＨＲＥＥ－ＤＩＭＥＮＳＩＯＮＡＬＶＩＳＣＯＵＳＦＬＯＷＦＩＥＬＤＡＲＯＵＮＤＡＳＨＩＰＳＴＥＲＮＬｉＴｉｎｇ－ｑｉｕ；Ｍｉａｏ...     

SECONDARY INSTABILITY WITH RESPECT TO SPATIAL GROWING THREE－DIMENSIONAL SUBHARMONIC DISTURBANCES IN BOUNDARY LAYER FLOW WITH SUCTION

ＳＥＣＯＮＤＡＲＹＩＮＳＴＡＢＩＬＩＴＹＷＩＴＨＲＥＳＰＥＣＴＴＯＳＰＡＴＩＡＬＧＲＯＷＩＮＧＴＨＲＥＥ－ＤＩＭＥＮＳＩＯＮＡＬＳＵＢＨＡＲＭＯＮＩＣＤＩＳＴＵＲＢＡＮＣＥＳＩＮＢＯＵＮＤＡＲＹＬＡＹＥＲＦＬＯＷＷＩＴＨＳＵＣＴＩＯＮ￥ＺｈａｏＧｅｎ...     

STUDY OF TURBULENT FLOW STRUCTURE AND CONTAMINANT DISTRIBUTION IN A 45°－BEND BY 3－D 2－LAYER MODEL

ＳＴＵＤＹＯＦＴＵＲＢＵＬＥＮＴＦＬＯＷＳＴＲＵＣＴＵＲＥＡＮＤＣＯＮＴＡＭＩＮＡＮＴＤＩＳＴＲＩＢＵＴＩＯＮＩＮＡ４５°－ＢＥＮＤＢＹ３－Ｄ２－ＬＡＹＥＲＭＯＤＥＬ￥ＸｕＷｅｉ－ｌｉｎ；ＬｉａｏＨｕａ－ｓｈｅｎｇ；ＹａｎｇＹｏｎｇ－ｑｕａｎ；ＷｕＣ...     

BEHAVIOR FOR NON-BUOYANT CIRCULAR SURFACE JETS IN COFLOWING STEAMS BY NUMERICAL SIMULATION

A three-dimensional mathematical model for calculating the steady flow of circular non-buoyant turbulent surface in a coflowing channel is presented in this paper.For closing the control equations,the κ-ε turbulence model is used in the mathematical model.The wall-function method is employed to treat the wall boundary condition at the bottom plane.The closed control equations are discretized by using Hybrid Finite Analytic Method(HFAM)on a non-uniform staggered grid system.The numerical results are obtained for different ratio of the jet velocity to the coflowing velocity.The comparison with experimental data shows good agreement.     

环形和双孔射流吸附区的混合有限分析解

应用标准的ｋ－ε湍流模式，结合混合有限分析法对环形和双孔水平射流的吸附区进行计算，并与Ｌｅｓｃｈｚｉｎｅｒ和Ｂｏｄｉ运用的有限差分的三种不同格式的模拟结果进行了对比，其结果优于有限差分三种不同模式的结果，表明混合有限分析法对带有回流的流场进行模拟是有效的。     

浅水型同流污水排放近区稀释特性

用三维湍流模式结合混合有限分析法对浅水型同流情况下污水排放的近区稀释特性进行了数值计算，与Ｐａｒｒ和ＭｃＧｕｉｒｋ的试验资料进行了对比，两者吻合较好，进而给出了温度和速度的沿程变化规律以及浮力射流的分叉现象。     

NUMERICAL SIMULATION OF STRESS-INDUCED SECONDARY FLOWS WITH HYBRID FINITE ANALYTIC METHOD

1 .　ＩＮＴＲＯＤＵＣＴＩＯＮＴｈｅｔｕｒｂｕｌｅｎｔｓｔｒｕｃｔｕｒｅｓｉｎｎｏｎ ｃｉｒｃｕｌａｒｄｕｃｔｓａｎｄｏｐｅｎｃｈａｎｎｅｌｓａｒｅｃｈａｒａｃｔｅｒｉｚｅｄｂｙｌｏｎｇｉｔｕｄｉ ｎａｌｖｏｒｔｉｃｅｓ .Ｔｈｅｓｅｖｏｒｔｉｃｅｓａｒｅｔｈ     

MEAN BEHAVIOR OF THREE DIMENSIONAL LINE BUOYANT JETS IN CROSS FLOWS

1 .　ＩＮＴＲＯＤＵＣＴＩＯＮＡｂｕｏｙａｎｔｊｅｔｉｓｄｅｆｉｎｅｄａｓａｓｏｕｒｃｅｏｆｂｕｏｙａｎｔｆｌｕｘａｎｄｉｎｉｔｉａｌｍｏｍｅｎｔｕｍｏｒｖｏｌｕｍｅｆｌｕｘ .Ａｌｔｈｏｕｇｈｌｏｎｇｍｕｌｔｉｐｏｒｔｄｉｆｆｕｓｅｒｓａｐｐｒｏｘｉｍａｔｅａｔｗｏ ｄｉｍｅｎ ｓｉｏｎａｌｌｉｎｅｓｏｕｒｃｅ ,ｔｈｅｄｉｓｐｅｒｓｉｏｎｏｆｔｈｅｄｉｓｃｈａｒｇｅｄｅｆ ｆｌｕｅｎｔｉｓａｃｔｕａｌｌｙａｔｈｒｅｅ ｄｉｍｅｎｓｉｏｎａｌｐｈｅｎｏｍｅｎｏｎ[1 ] .Ｍｏｓｔｉｎｖｅｓｔｉｇａｔｉｏｎ…     

Poroelastic solid flow with double point material point method

This paper presents the numerical modelling of one and two-dimensional poroelastic solid flows,using the material point method with double point formulation.The double point formulation offers the convenience of allowing for transitions in the flow conditions of the liquid,between free surface flow and groundwater flow.The numerical model is validated by comparing the solid flow velocity with the analytical solution.The influence of the Young's modulus on the solid flow velocity is discussed for both one and two-dimensional analysis cases.The effect of the shape of the two-dimensional solid is investigated.It is shown that the solid stiffness has an effect on the poroelastic flow velocity,due to swelling and bending for the one and two-dimensional cases,respectively.The shape is found to be an important factor on the flow velocity of the poroelastic solid.     

平面二维非均匀泥沙OpenMP并行计算模型

为实现平面二维非均匀泥沙模型并行计算,采用OpenMP指令对串行源程序进行改造。基于三角形-四边形混合网格的平面二维非均匀泥沙有限体积模型具有显式求解时网格单元相互独立性这种特性,Fortran串行源程序无需进行较大的修改,只要在循环计算和数组整体操作部分嵌入OpenMP循环并行指令和数组并行指令,即可实现并行计算。案例分析结果表明,在并行线程数目等于计算机固有线程数目时,并行加速比达到最大值1.55;OpenMP技术使用线程间共享内存的方式协调并行计算,很适合在多核计算机上运行,且编程简单灵活,将随着计算机硬件性能的提高得到更广泛的应用。     

A spacetime discontinuous Galerkin method for the two-dimensional unsteady convection-dispersion problems

The unsteady two-dimensional convection-diffusion (CD) equation, which is the governing equation of the unsteady two-dimensional convection-dispersion problem, as the water contamination problems, has a mixed hyperbolic-parabolic character. When the equation has a strong mixed hyperbolic character, the exact solution is nonsmooth. In this case, the conventional numerical methods give approximate solutions which either oscillate or smear out the sharp front of the exact solution. The spacetime discontinuous Galerkin method (STDGM) is an extention of the space discontinuous Galerkin method (SDGM), applying the discontinuity in the time direction, as well as in space. Both these methods are respective modifications of the standard Galerkin finite element method (SGM). In this paper, the STDGM is applied to solve the CD equation, when the Péclet number has extremely high values, which means a strong mixed hyperbolic character. With this method, three artificial diffusion terms are introduced by modifying the test functions of the finite element method. These functions include the discontinuity int, x andy axis. The results obtained from the analytical solution of the problem are used for testing the numerical solution, applying both the space-discontinuous Galerkin method (SDGM) and the STDGM and are presented in diagrams, from which useful observations, comparisons and conclusions can be drawn.     

海堤龙口水力计算方法探讨

针对深厚淤泥软土滩涂的海堤龙口抗水流冲刷能力较差的问题,对海堤龙口水力学特性进行了研究分析,依据水力学理论及水量平衡原理建立了海堤龙口水力计算基本方程,该方程为非线性常微分方程,一般情况下难以给出精确解析解,依据数值分析理论利用经典四阶Runge-Kutta法结合MATLAB数值计算软件编程可给出数值解;另外,利用正弦函数拟合外海潮位周期变化特性,利用二次函数拟合围区库容-水位关系曲线,结合相关数值等效分析法及海堤龙口计算经验,给出了海堤龙口最大水位差与龙口宽度之间的近似解析计算方法;最后通过工程案例,利用MATLAB数值分析软件计算对比分析,认为本算法能满足工程实际应用要求。     

二维兴波水翼水动力预报的涡分布法

本文用奇点面分布法预报二维自由面边界下水翼的水动力特性。采用线性化的自由面边界条件。水翼表面划分为若干单元，每个单元上布置线性分布的涡，并在其中点满足Ｎｅｕｍａｎｎ型物面边界条件。与试验结果比较表明，计算结果是合理的，本计算方法能显示二维兴波水翼水动力特性与Ｆｒｏｕｄｅ数，相对浸深和攻角的关系。