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...     

NUMERICAL SIMULATION OF FLOW FOLD OF A RIVER WITH COMPLICATED BOUNDARIES

ＮＵＭＥＲＩＣＡＬ　ＳＩＭＵＬＡＴＩＯＮ　ＯＦ　ＦＬＯＷ　ＦＩＥＬＤ　ＯＦ　Ａ　ＲＩＶＥＲ　ＷＩＴＨ　ＣＯＭＰＬＩＣＡＴＥＤ　ＢＯＵＮＤＡＲＹＳＮＵＭＥＲＩＣＡＬＳＩＭＵＬＡＴＩＯＮＯＦＦＬＯＷＦＯＬＤＯＦＡＲＩＶＥＲＷＩＴＨＣＯＭＰＬＩＣＡＴＥＤＢ...     

NUMERICAL SIMULATION OF THE TURBULENT FLUID FLOW AND PREDICTION OF INCIPIENT CAVITATION NUMBER ON ISOLATED SURFACE TRIANGULAR PROTRUSION

ＮＵＭＥＲＩＣＡＬＳＩＭＵＬＡＴＩＯＮＯＦＴＨＥＴＵＲＢＵＬＥＮＴＦＬＵＩＤＦＬＯＷＡＮＤＰＲＥＤＩＣＴＩＯＮＯＦＩＮＣＩＰＩＥＮＴＣＡＶＩＴＡＴＩＯＮＮＵＭＢＥＲＯＮＩＳＯＬＡＴＥＤＳＵＲＦＡＣＥＴＲＩＡＮＧＵＬＡＲＰＲＯＴＲＵＳＩＯＮ￥ＲｅｎＢｉ...     

THE RESEARCH OF NATURAL THREE－DIMENSIONAL NUMERICAL MODEL FOR WATER－SEDIMENT TWO－PHASE FLOW AND SEDIMENT MOVING REGULARITY NEAR THE RIVER BOUNDARY

ＴＨＥ　ＲＥＳＥＡＲＣＨ　ＯＦ　ＮＡＴＵＲＡＬ　ＴＨＲＥＥ－ＤＩＭＥＮＳＩＯＮＡＬ　ＮＵＭＥＲＩＣＡＬ　ＭＯＤＥＬ　ＦＯＲ　ＷＡＴＥＲ－ＳＥＤＩＭＥＮＴ　ＴＷＯ－ＰＨＡＳＥ　ＦＬＯＷ　ＡＮＤ　ＳＥＤＩＭＥＮＴ　ＭＯＶＩＮＧ　ＲＥＧＵＬＡＲＩＴＹ　ＮＥ...     

THE INFLUENCE OF THE SECONDARY NORMAL STRESS DIFFERENCE OF VISCOELASTIC FLUID ON ECCENTRIC CAPSULE FLOW

ＴＨＥＩＮＦＬＵＥＮＣＥＯＦＴＨＥＳＥＣＯＮＤＡＲＹＮＯＲＭＡＬＳＴＲＥＳＳＤＩＦＦＥＲＥＮＣＥＯＦＶＩＳＣＯＥＬＡＳＴＩＣＦＬＵＩＤＯＮＥＣＣＥＮＴＲＩＣＣＡＰＳＵＬＥＦＬＯＷ￥ＰａｎＤａ－ｌｉｎ（ＧｕａｎｇｄｏｎｇＩｎｓｔｉｔｕｔｅｏｆｏｆＴｅｃ...     

THE APPLICATION OF THE AVERAGING FINITE DIFFERENCE SCHEME IN THE SIMULATION OF SEPARATED FLOW

ＴＨＥ　ＡＰＰＬＩＣＡＴＩＯＮ　ＯＦ　ＴＨＥ　ＡＶＥＲＡＧＩＮＧ　ＦＩＮＩＴＥ　ＤＩＦＦＥＲＥＮＣＥ　ＳＣＨＥＭＥ　ＩＮ　ＴＨＥ　ＳＩＭＵＬＡＴＩＯＮ　ＯＦ　ＳＥＰＡＲＡＴＥＤ　ＦＬＯＷＴＨＥＡＰＰＬＩＣＡＴＩＯＮＯＦＴＨＥＡＶＥＲＡＧＩＮＧＦＩＮＩ...     

STUDY OF INTERACTION BETWEEN VORTICES AND A FREE SURFACE PART Ⅱ：INTERACTION OF DOUBLE VISCOUS VORTEX DIPOLES WITH A FREE SURFACE

ＳＴＵＤＹＯＦＩＮＴＥＲＡＣＴＩＯＮＢＥＴＷＥＥＮＶＯＲＴＩＣＥＳＡＮＤＡＦＲＥＥＳＵＲＦＡＣＥＰＡＲＴⅡ：ＩＮＴＥＲＡＣＴＩＯＮＯＦＤＯＵＢＬＥＶＩＳＣＯＵＳ　ＶＯＲＴＥＸＤＩＰＯＬＥＳＷＩＴＨＡＦＲＥＥＳＵＲＦＡＣＥ￥ＷｕＣｈｕｉ－ｊｉｅ；Ｔａｎ...     

NUMERICAL SIMULATION OF DISCONTINUOUS FLOW IN CIRCULAR CONDUITS

ＮＵＭＥＲＩＣＡＬ　ＳＩＭＵＬＡＴＩＯＮ　ＯＦ　ＤＩＳＣＯＮＴＩＮＵＯＵＳ　ＦＬＯＷ　ＩＮ　ＣＩＲＣＵＬＡＲ　ＣＯＮＤＵＩＴＳＮＵＭＥＲＩＣＡＬＳＩＭＵＬＡＴＩＯＮＯＦＤＩＳＣＯＮＴＩＮＵＯＵＳＦＬＯＷＩＮＣＩＲＣＵＬＡＲＣＯＮＤＵＩＴＳ￥ＭａｏＺｅ...     

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

ＮＡＴＵＲＡＬＣＯＮＶＥＣＴＩＶＥＨＥＡＴＡＮＤＭＡＳＳＴＲＡＮＳＦＥＲＢＹＴＨＥＣＯＵＰＬＩＮＧＯＦＴＥＭＰＥＲＡＴＵＲＥＣＲＡＤＩＥＮＴ　ＡＮＤＣＯＮＣＥＮＴＲＡＴＩＯＮＧＲＡＤＩＥＮＴＩＮＡＰＯＲＯＵＳＭＥＤＩＵＭ￥ＣｈｅｎＢａＯ－Ｍｉｎｇ；Ｆ...     

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

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

INTERACTION BETWEEN WAVES,STRUCTURES AND SAND BEDS

ＩＮＴＥＲＡＣＴＩＯＮＢＥＴＷＥＥＮＷＡＶＥＳ，ＳＴＲＵＣＴＵＲＥＳＡＮＤＳＡＮＤＢＥＤＳ￥ＧａｏＸｕｅ－ｐｉｎｇ（Ｄｅｐｔ．ｏｆＷａｔｅｒＲｅｓｏｕｒｃｅｓ＆ＨａｒｂｏｕｒＥｎｇ．，ＴｉａｎｊｉｎＵｎｉｖ．，Ｔｉａｎｊｉｎ，３０００７２，Ｐ．Ｒ．Ｃ...     

DYNAMIC RESPONSE ANALYSIS OF DDMS PLATFORM SUBJECTED TO ACTIONS OF WAVE GROUPS AND CURRENT FOURCES

Coupled dynamic analysis of the Deep Draft Multi-Spar (DDMS) platform and the mooring system under the action of waves and current is carried out in the time domain. Using a geometrically nonlinear finite element method, the mooring-line dynamics is simulated based on the total Lagrangian formulation. Wave groups are obtained by the JONSWAP spectrum and an empirical wave envelope spectrum involving two envelope-based factors Group Height Factor (GFH) and Group Length Factor (GLF). The results show that the wave groups have a significant effect on the motion responses of the platform and the mooring line tensions.     

A NOTE ON THE COMPLEX DISPERSION RELATION FOR STEADY VISCOUS SHIP WAVES

Based on the double Fourier integral representation for steady viscous ship waves, which involves a generic amplitude function and a complex dispersion relation, the phase function for three dimensional ship waves in the far field was asymptotically derived by means of the Lighthill twostage scheme combining the Cauchy residue theorem and the method of steepest descents, and the effect of viscosity on wavelengths was numerically investigated with the Newton iteration method. It is found that the transverse and diverging waves are elongated due to the presence of viscosity and the latter is more heavily affected and that the phase differences between the viscous transverse and diverging waves are larger than those of the corresponding inviscid waves.     

TESTS AND APPLICATIONS OF A BOUSSINESQ MODEL WITH AMBIENT CURRENT

A new type Boussinesq model is proposed and applied for wave propagation in a wave flume of uniform depth and over a submerged bar with current present or absent, respectively. Firstly, for the propagation of monochromatic incident wave with current absent, the Boussinesq model is tested in its complete form, and in a form without the introduction of utility velocity variables. It is validated that the introduction of utility velocity variables can improve the characteristics of velocity field, dispersion and nonlinearity. Both versions of the Boussinesq models are of higher accuracy than the fully-nonlinear fourth-order model, which is one of the best forms among the existing traditional Boussinesq models that do not incorporate breaking mechanism in one dimension. Secondly, the Boussinesq model in its complete form is applied to simulating the propagation of bichromatic incident waves with current present or absent, respectively, and the modeled results are compared to the analytical ones or the experimental ones. The modeled results are reasonable in the case of inputting bichromatic incident waves with the strong opposing current present.     

近海人工岛及沙坝工程与潮流的响应特征研究

北戴河新区位于最具发展潜力的环渤海经济圈中心地带,为满足旅游业发展需要而建的人工岛和保护旅游海滩而建的人工沙坝对近海潮流动力有不同程度的影响。该文基于MIKE21 FM模块通过大、中、小模型三层嵌套的方式建立洋河-葡萄岛近岸海域潮流数学模型,研究分析人工岛及沙坝工程建设前后的潮流动力变化特征,得到下列主要结论:工程建设后研究区域的主体潮流特征仍为顺岸往复流,流速变化量涨潮大于落潮;人工岛工程对流速场的影响范围和程度均明显大于沙坝工程,其中人工岛工程引起的流速变化量是沙坝工程的4倍;人工岛的建设使其内部形成一个相对封闭的水域,流速近乎为零,而养滩工程区在两侧水工建筑物和水下人工沙坝的掩护作用下流速基本减小至0.10 m/s以下。     

垂直桩柱正向波流力的计算及水动力系数C_D、C_M分析方法的探讨

文中首先综述了目前常用的水动力系数C_D,C_M的分析方法,并通过大量实验结果的分析对比得出,只要按本文所定义的KC数相同,则无论是纯波场,还是波流共存场,不管是规则波情况下还是不规则波情况下,都应具有相近的C_D、C_M值。文中还通过计算值与实验结果的对比,验证了本文所述波流共存场中不规则波情况下桩柱波流力计算方法是切实可行的。     

NUMERICAL SIMULATION OF THE TIDAL MOTION AND SUSPEND EDSEDIMENT TRANSPORT IN THE RADIAL SANDBANK AREA OF THE SOUTHERN YELLOW SEA

A coupled 2-D numerical model for hydrodynamic-sediment transport was established and applied to simulate the tides, tidal currents and sediment movement in the submarine Radial Sandbank area of the southern Yellow Sea.With a high-resolution topography dataset used in the model,the simulation reproduced a fine-structured current field and erosion-siltation distribution. The modeled results show that,in the area of Radial Sandbanks, reversing tidal current and seabed erosion occurs within troughs while tidal current with more rotary feature and deposition occurs above sandbanks,which indicates the tidal-induced formation of the Radial Sandbanks. During a tidal period, associating with the variation of current speed, erosion alternates with siltation. The seabed deformation depends on the relative strength of erosion and siltation in a tidal period.     

COMPARISON OF SCOURS IN FRONT OF VERTICAL BREAKWATERS DUE TO REGULAR AND IRREGULAR WAVES

1 .　ＩＮＴＲＯＤＵＣＴＩＯＮＴｈｅｓｃｏｕｒｓｏｆｓａｎｄｂｅｄｉｎｆｒｏｎｔｏｆｖｅｒｔｉｃａｌｂｒｅａｋｗａｔｅｒｓｕｎｄｅｒｔｈｅａｃｔｉｏｎｏｆｒｅｇｕｌａｒｓｔａｎｄ ｉｎｇｗａｖｅｓｗｅｒｅｉｎｖｅｓｔｉｇａｔｅｄａｎｄｓｏｍｅｇｏｏｄｒｅｓｕｌｔｓｗｅｒｅｏｂｔａｉｎｅｄ ,ｉｎｃｌｕｄｉｎｇｓｃｏｕｒｉｎｇｐａｔ ｔｅｒｎｓ ,ｓｃｏｕｒｉｎｇｍｅｃｈａｎｉｓｍｓ ,ｃｒｉｔｅｒｉａｆｏｒｄｉｓｔｉｎｇｕｉｓｈｉｎｇｓｃｏｕｒｉｎｇ ｐａｔｔｅｒｎｓ ,ｐｒｅｄｉｃｔｉｏｎｏｆｓｃｏｕｒｉ…     

UNSTEADY WAVES DUE TO AN IMPULSIVE OSEENLET BENEATH THE CAPILLARY SURFACE OF A VISCOUS FLUID

The two-dimensional free-surface waves due to a point force steadily moving beneath the capillary surface of an incompressible viscous fluid of infinite depth were analytically investigated. The unsteady Oseen equations were taken as the governing equations for the viscous flows. The kinematic and dynamic conditions including the combined effects of surface tension and viscosity were linearized for small-amplitude waves on the free-surface. The point force is modeled as an impulsive Oseenlet. The complex dispersion relation for the capillary-gravity waves shows that the wave patterns are characterized by the Weber number and the Reynolds number. The asymptotic expansions for the wave profiles were explicitly derived by means of Lighthill’s theorem for the Fourier transform of a function with a finite number of singularities. Furthermore, it is found that the unsteady wave system consists of four families, that is, the steady-state gravity wave, the steady-state capillary wave, the transient gravity wave, and the transient capillary wave. The effect of viscosity on the capillary-gravity was analytically expressed.     

AN INTEGRATEDC METHOD FOR COMPUTING COMPUTING THE INTERNAL AND EXTERNAL VISCOUS FLOW FIELD AROUND THE DUCTED PROPULSOR BEHIND AN AXISYMMETRIC BODY

ＡＮＩＮＴＥＧＲＡＴＥＤＣＭＥＴＨＯＤＦＯＲＣＯＭＰＵＴＩＮＧＣＯＭＰＵＴＩＮＧＴＨＥＩＮＴＥＲＮＡＬＡＮＤＥＸＴＥＲＮＡＬＶＩＳＣＯＵＳＦＬＯＷＦＩＥＬＤＡＲＯＵＮＤＴＨＥＤＵＣＴＥＤＰＲＯＰＵＬＳＯＲＢＥＨＩＮＤＡＮＡＸＩＳＹＭＭＥＴＲＩＣＢＯＤ...