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Effects of Free Heave Motion on Wave Forces on Two Side-by-Side Boxes in Close Proximity Under Wave Actions 认领 引用 被引量：7
1
作者 HE Zhi-wei GAO Jun-liang +3 位作者 ZANG Jun CHEN Hong-zhou LIU Qian WANG Gang 《China Ocean Engineering》 SCIE EI CSCD 2021年第4期490-503,共14页
Wave forces on two side-by-side boxes in close proximity under wave actions were analyzed using the OpenFOAM package.The upstream box heaved freely under wave actions,whereas the downstream box remained fixed.For comp... Wave forces on two side-by-side boxes in close proximity under wave actions were analyzed using the OpenFOAM package.The upstream box heaved freely under wave actions,whereas the downstream box remained fixed.For comparison,a configuration in which both boxes were fixed was also considered.The effects of the heave motion of the upstream box on the wave loads,including the horizontal wave forces,vertical wave forces,and moments on the boxes,were the focus of this study.Numerical analyses showed that all frequencies at which the maximum horizontal wave forces,maximum vertical wave forces,and maximum moment appeared are dependent on the heave motion of the upstream box and that the effects of the heave motion on these frequencies are different.Furthermore,these frequencies were observed to deviate from the corresponding fluid resonant frequency.Moreover,the heave motion of the upstream box reduced the wave forces acting on both boxes and altered the variation trends of the wave forces with the incident wave frequency. 展开更多
关键词 fluid resonance wave forces narrow gap heave motion OpenFOAM
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A Time-Domain Coupled Model for Nonlinear Wave Forces on A Fixed Box-Shaped Ship in A Harbor 认领 引用 被引量：3
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作者 王大国 邹志利 +1 位作者 谭国焕 刘霞 《China Ocean Engineering》 SCIE EI 2010年第1期41-56,共16页
A 2-D time-domain numerical coupled model is developed to obtain an efficient method for nonlinear wave forces on a fixed box-shaped ship in a harbor. The domain is divided into an inner domain and an outer domain. Th... A 2-D time-domain numerical coupled model is developed to obtain an efficient method for nonlinear wave forces on a fixed box-shaped ship in a harbor. The domain is divided into an inner domain and an outer domain. The inner domain is the area beneath the ship and the flow is described by the simplified Euler equations. The other area is the outer domain and the flow is defined by the higher-order Boussinesq equations in order to consider the nonlinearity of the wave motions. Along the interface boundaries between the inner domain and the outer domain, the volume flux is assumed to be continuous and the wave pressures are equal. Relevant physical experiment is conducted to validate the present model. It is shown that the numerical results agree with the experimental data. Compared with the coupled model with the flow in the inner domain governed by the Laplace equation, the present coupled model is more efficient and its solution procedure is more simple, which is particularly useful for the study on the effect of the nonlinear wave forces on a fixed box-shaped ship in a large harbor. 展开更多
关键词 coupled model wave forces Boussinesq equations Euler equations
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Calculation Method of Wave Forces on Large Round-Ended Caisson Foundation 认领 引用 被引量：3
3
作者 WEI Chengxun ZHOU Daocheng OU Jinping 《Journal of Shanghai Jiaotong university(Science)》 EI 2019年第2期184-189,共6页
This paper presents an analytical formula for estimating the longitudinal wave forces on a large roundended caisson foundation. The establishment of the formula is based on the superposition of the theoretical formula... This paper presents an analytical formula for estimating the longitudinal wave forces on a large roundended caisson foundation. The establishment of the formula is based on the superposition of the theoretical formula of wave forces on a large circular cylinder and the empirical formula of wave forces on a large rectangular cylinder. With the formula transformed into an inertial force form, a specific inertia coefficient with an exact expression is extracted from the formula. The numerical calculations of the wave forces on round-ended cylinders are carried out by the boundary-element method. The undetermined coefficients in the expression of the inertial coefficient are determined by the numerical results. It is obvious that the numerical values can be well expressed by the computation values from the established formula. By a model experiment carried out in laboratory wave flume, the correctness of the analytical formula is further verified by the measured wave forces on a test model of a round-ended bridge caisson foundation. The comparison shows that the experimental forces can be approximately estimated by this simple calculation method. 展开更多
关键词 calculation formula wave forces round-ended caisson foundation numerical model experiment verification
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Wave Forces and Moments on a Gravity Pier Foundation 认领 引用 被引量：3
4
作者 WEI Chengxun ZHOU Daocheng OU Jinping 《Journal of Shanghai Jiaotong university(Science)》 EI 2019年第3期305-312,共8页
In order to understand the wave forces and moments on a gravity pier foundation which consists of an upper column and a bottom gravity base,a model experiment with a scale of 1:60 has been conducted in a laboratory fl... In order to understand the wave forces and moments on a gravity pier foundation which consists of an upper column and a bottom gravity base,a model experiment with a scale of 1:60 has been conducted in a laboratory flume.A corresponding numerical calculation by using the boundary element method has been carried out to provide a comparative analysis.It is shown by the comparisons that the numerical wave forces and moments agree well with the experimental results.It is proved that the wave forces and moments acting on the foundation are completely in their inertia dominative areas for wave loads.With the diffraction effects considered into the inertia item,appropriate inertia coefficients are assessed by the experimental results for the inertia item of the Morison equation.The formula of the inertia item can be used to estimate wave forces and moments on such gravity foundations. 展开更多
关键词 gravity pier foundation model experiment wave forces and moments numerical calculation inertia coefficient
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NUMERICAL MODEL OF WAVE FORCES ON CONTINUOUS CYLINDER STRUCTURES 认领 引用 被引量：7
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作者 白志刚 周锡祊 +1 位作者 孙克俐 周旭 《Transactions of Tianjin University》 CAS 2001年第2期71-75,共5页
A numerical model of wave force upon continuous cylinder structures with a large diameter using the boundary element method (BEM) is presented. A numerical model of reflecting wave upon continuous cylinders was establ... A numerical model of wave force upon continuous cylinder structures with a large diameter using the boundary element method (BEM) is presented. A numerical model of reflecting wave upon continuous cylinders was established on the basis of linear wave theory.The fundamental solution to the Helmholtz equation within an infinite strip area that explicitly satisfies two infinite parallel boundaries is used together with Radiation condition rather than the solution of an infinite area.According to the proposed theory and method,the computer programs have been composed in Visual C ++ Development Studio.Several examples show that the technique and its program are feasible and efficient.And the wave forces upon continuous cylinders can be decreased by as much as 14%～24% under a ratio of D/L= 0.09～0.19 compared with the square caissons. 展开更多
关键词 numerical method wave forces BEM cylinder structure
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An Experimental Study of Irregular Wave Forces on Multiple Quasi-ellipse Caissons 认领 引用 被引量：2
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作者 XiaozhongRen Peng Zhang +1 位作者 Yuxiang Ma Yufan Meng 《Journal of Marine Science and Application》 2014年第3期265-273,共9页
An experimental investigation of irregular wave forces on quasi-ellipse caisson structures is presented. Irregular waves were generated based on the Jonswap spectrum with two significant wave heights, and the spectrum... An experimental investigation of irregular wave forces on quasi-ellipse caisson structures is presented. Irregular waves were generated based on the Jonswap spectrum with two significant wave heights, and the spectrum peak periods range from 1.19 s to 1.81 s. Incident wave directions relative to the centre line of the multiple caissons are from 0＆#176; to 22.5＆#176;. The spacing between caissons ranges from 2 to 3 times that of the width of the caisson. The effects of these parameters on the wave forces of both the perforated and non-perforated caissons were compared and analyzed. It was found that the perforated caisson can reduce wave forces, especially in the transverse direction. Furthermore, the relative interval and incident wave direction have significant effects on the wave forces in the case of multiple caissons. 展开更多
关键词 relative wave length relative interval incident wave direction relative wave height quasi-ellipse caisson perforated quasi-ellipse caisson irregular wave forces
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Wave Forces Acting on Vertical Walls 认领 引用
7
作者 李本霞 俞聿修 余锡平 《China Ocean Engineering》 SCIE EI 2008年第1期151-160,共10页
Regular and irregular wave forces acting on vertical walls are studied by a previously developed numerical model. The computed wave forces are compared with the available experimental data to verify the numerical mode... Regular and irregular wave forces acting on vertical walls are studied by a previously developed numerical model. The computed wave forces are compared with the available experimental data to verify the numerical model, and satisfactory agreements are obtained. The variation of wave forces with incident angles and the shape of simultaneous pressure distribution are investigated, and the comparisons between numerical results and Goda＇ s predictions are also carried out. It is concluded that the maximum wave forces acting on the unit length of vertical wall is often induced by the obliquely incident waves instead of normally incident waves, while Goda＇ s formula may be inapplicable for oblique wave incidence. The shape of simultaneous pressure distribution is not significantly influenced by incident angles, and it can be favorably predicted by Goda＇ s formula. When regular wave heights are taken as the same as irregular wave height H1%, the irregular wave forces Ph. 1% are slightly larger than regular wave forces in most cases. 展开更多
关键词 wave forces vertical walls simultaneous pressure distribution obliquely incident waves
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Experimental study of reflection coefficient and wave forces acting on perforated caisson 认领 引用 被引量：4
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作者 Chen Xuefeng +5 位作者 Li Yucheng Sun Dapeng Chen Renyou 《Acta Oceanologica Sinica》 SCIE CAS 2002年第3期451-460,共10页
The reflection coefficient and the total horizontal forces of regular waves acting on theperforated caisson are experimentally investigated. The empirical relationship between reflection coefficient and the ratio of t... The reflection coefficient and the total horizontal forces of regular waves acting on theperforated caisson are experimentally investigated. The empirical relationship between reflection coefficient and the ratio of the total horizontal forces acting on the perforated caisson to those on solid vertical walls with the relative chamber width, relative water depth and porosity of perforated wall, etc. are given. Moreover, the results of the ratio of the total horizontal forces are also compared with formulas given by Chinese Harbour Design Criteria and Takahashi, which may be useful for the practical engineering application. 展开更多
关键词 Perforated caisson reflection coefficient wave forces
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Reliability Analysis of Numerical Simulation of Sea-Crossing Bridge Deformation Under Wave Forces 认领 引用 被引量：1
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作者 LUAN Yuanzhong YU Jian +3 位作者 HU Junwei DONG Yue GUI Weizhen JI Zhaolei 《Transactions of Nanjing University of Aeronautics and Astronautics》 EI CSCD 2021年第1期164-172,共9页
To study on the numerical simulation calculation reliability of sea-crossing bridge under complex wave forces,the paper applied GPS deformation monitoring and numerical simulation calculation by researching Qingdao Ji... To study on the numerical simulation calculation reliability of sea-crossing bridge under complex wave forces,the paper applied GPS deformation monitoring and numerical simulation calculation by researching Qingdao Jiaozhou Bay Sea-Crossing Bridge.The db3 wavelet three-layer decomposition was used on the horizontal movement of the sea-crossing bridge and the wind speed of the waves to analyze their correlation.The complex wave forces value of Qingdao Jiaozhou Bay Sea-Crossing Bridge was loaded on FLAC3D software successfully to make numerical simulation calculation of bridge deformation.Since the accuracy of the GPS deformation monitoring reaches millimeter level,it was used to monitor the exact value of the bridge deformation to judge the reliability of numerical simulation.The relative errors of displacement in X,Y and Z directions were between 33%and 41%through comparison.It could be seen that the numerical simulation error was relatively large,which was mainly due to various environmental factors and the deviation of applied wave forces.However,numerical simulation generally reflects the deformation law of the sea-crossing bridge under complex wave forces,providing an effectively technical support for the safe operation assessment of the sea-crossing bridge. 展开更多
关键词 sea-crossing bridge GPS monitoring three-dimensional deformation numerical simulation of wave forces relative error
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Viscous Effects on Wave Forces on A Submerged Horizontal Circular Cylinder 认领 引用 被引量：7
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作者 TENG Bin MAO Hong-fei LU Lin 《China Ocean Engineering》 SCIE EI CSCD 2018年第3期245-255,共11页
Numerical simulations are carried out for wave action on a submerged horizontal circular cylinder by means of a viscous fluid model, and it is focused on the examination of the discrepancies between the viscous fluid ... Numerical simulations are carried out for wave action on a submerged horizontal circular cylinder by means of a viscous fluid model, and it is focused on the examination of the discrepancies between the viscous fluid results and the potential flow solutions. It is found that the lift force resulted from rotational flow on the circular cylinder is always in anti-phase with the inertia force and induces the discrepancies between the results. The influence factors on the magnitude of the lift force, especially the correlation between the stagnation-point position and the wave amplitude, and the effect of the vortex shedding are investigated by further examination on the flow fields around the cylinder. The viscous numerical calculations at different wave frequencies showed that the wave frequency has also significant influence on the wave forces. Under higher frequency and larger amplitude wave action, vortex shedding from the circular cylinder will appear and influence the wave forces on the cylinder substantially. 展开更多
关键词 submerged horizontal circular cylinder wave force lift force vortex effect
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A B-Spline Based BEM and Its Applicaion in Predicting Wave Forces on 3D Bodies 认领 引用 被引量：9
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作者 滕斌 柏威 向阳 《China Ocean Engineering》 SCIE EI 1999年第3期257-264,共8页
For the computation of wave forces on structures, a B-spline expansion is applied to discretize the body surface, and represent the velocity potentials on the body surface. The expansion coefficients for the body geom... For the computation of wave forces on structures, a B-spline expansion is applied to discretize the body surface, and represent the velocity potentials on the body surface. The expansion coefficients for the body geometry are determined by the Least Square Method, and the coefficients for velocity potentials by the Galerkin method. The method can give continuous description of velocity potentials and their derivatives on the whole smooth body surface. The method has been implemented, and numerical results show that the method gives very accurate results and its convergence is fast. 展开更多
关键词 wave force boundary element method B-spline
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Effects of Second-Order Sum-and Difference-Frequency Wave Forces on the Motion Response of a Tension-Leg Platform Considering the Set-down Motion 认领 引用 被引量：3
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作者 WANG Bin TANG Yougang +1 位作者 LI Yan CAI Runbo 《Journal of Ocean University of China》 SCIE CAS CSCD 2018年第2期311-319,共9页
This paper presents a study on the motion response of a tension-leg platform(TLP)under first-and second-order wave forces,including the mean-drift force,difference and sum-frequency forces.The second-order wave force ... This paper presents a study on the motion response of a tension-leg platform(TLP)under first-and second-order wave forces,including the mean-drift force,difference and sum-frequency forces.The second-order wave force is calculated using the full-field quadratic transfer function(QTF).The coupled effect of the horizontal motions,such as surge,sway and yaw motions,and the set-down motion are taken into consideration by the nonlinear restoring matrix.The time-domain analysis with 50-yr random sea state is performed.A comparison of the results of different case studies is made to assess the influence of second-order wave force on the motions of the platform.The analysis shows that the second-order wave force has a major impact on motions of the TLP.The second-order difference-frequency wave force has an obvious influence on the low-frequency motions of surge and sway,and also will induce a large set-down motion which is an important part of heave motion.Besides,the second-order sum-frequency force will induce a set of high-frequency motions of roll and pitch.However,little influence of second-order wave force is found on the yaw motion. 展开更多
关键词 tension-leg platform random wave second-order wave force quadratic transfer function sum-frequency difference-frequency set-down motion
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Numerical Simulation of Wave Forces on Seabed Pipelines 认领 引用 被引量：2
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作者 Li, YC Chen, B Lai, GZ 《China Ocean Engineering》 SCIE EI 1998年第2期203-211,共9页
A three-step finite element method (FEM) together with Large Eddy Simulation (LES) is applied to incompressible turbulent flow around seabed pipelines at relatively high Reynolds numbers. Both two dimensional and thre... A three-step finite element method (FEM) together with Large Eddy Simulation (LES) is applied to incompressible turbulent flow around seabed pipelines at relatively high Reynolds numbers. Both two dimensional and three-dimensional numerical simulation is carried out to determine the three-dimensional effect. The results of numerical simulation agree quite well with the wave forces acting on pipeline models measured in physical model test. 展开更多
关键词 three-step finite element method large eddy simulation seabed pipeline wave force
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Study on Current-Random Wave Forces Acting on a Framework 认领 引用
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作者 E, XQ Shao, CP Gao, YX 《China Ocean Engineering》 SCIE EI 1998年第3期265-274,共10页
The forces of random wave plus current acting on a simplified offshore platform (jacket) model have been studied numerically and experimentally. The numerical results are in good agreement with experiments. The mean f... The forces of random wave plus current acting on a simplified offshore platform (jacket) model have been studied numerically and experimentally. The numerical results are in good agreement with experiments. The mean force can be approximated as a function of equivalent velocity parameter and the root-mean-square force as a function of equivalent significant wave height parameter. 展开更多
关键词 random wave wave forces current condition jacket framework
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3D Numerical Modeling of Wave Forces on Tandem Fixed Cylinders Using the BEM 认领 引用 被引量：1
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作者 Mohammad Javad Ketabdari Mohammad Mahdi Abaiee Ali Ahmadi 《Journal of Marine Science and Application》 2013年第3期279-285,共7页
In this paper a 3D numerical model was developed to study the complicated interaction between waves and a set of tandem fixed cylinders.The fluid was considered to be inviscid and irrotational.Therefore,the Helmholtz ... In this paper a 3D numerical model was developed to study the complicated interaction between waves and a set of tandem fixed cylinders.The fluid was considered to be inviscid and irrotational.Therefore,the Helmholtz equation was used as a governing equation.The boundary element method（BEM） was adopted to discretize the relevant equations.Open boundaries were used in far fields of the study domain.Linear waves were generated and propagated towards tandem fixed cylinders to estimate the forces applied on them.Special attention was paid to consideration of the effect on varying non-dimensional cylinder radius and distance between cylinders,ka and kd on forces and trapped modes.The middle cylinder wave forces and trapped modes in a set of nine tandem cylinders were validated utilizing analytical data.The comparisons confirm the accuracy of the model.The results of the inline wave force estimation on n tandem cylinders show that the critical cylinder in the row is the middle one for odd numbers of cylinders.Furthermore the results show that the critical trapped mode effect occurs for normalized cylinder radiuses close to 0.5 and 1.0.Finally the force estimation for n tandem cylinders confirms that force amplitude of the middle cylinder versus normalized separation distance fluctuates about that of a single cylinder. 展开更多
关键词 tandem cylinders boundary element method（BEM） wave force diffraction trapped mode Henkel function
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A Finite Element Solution of Wave Forces on Submerged Horizontal Circular Cylinders 认领 引用 被引量：3
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作者 赵明 滕斌 谭丽 《海洋工程：英文版》 2004年第3期335-346,共12页
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 nu... 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. 展开更多
关键词 finite element method Navier-Stokes equations wave force circular cylinder
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Numerical Analysis of Wave Forces on Arbitrarily Shaped Multi-Pillars Over Varying Topography 认领 引用
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作者 Zhang Libang Research Engineer, First Institute of Oceanography, Qingdao 《China Ocean Engineering》 SCIE EI 1991年第4期465-471,共7页
The modified hybrid element method (MHEM) is utilized to predict and analyze wave forces on arbitrarily shaped multiple bodies. This method can be applied to waves of all water depths, i. e. shallow, intermediate, and... The modified hybrid element method (MHEM) is utilized to predict and analyze wave forces on arbitrarily shaped multiple bodies. This method can be applied to waves of all water depths, i. e. shallow, intermediate, and deep waters, on slowly varying seabed. The MHEM employs the ICCG method to save CPU and storage, thus the computation of wave forces for large multi-body systems can be carried out on microcomputers. Numerical results of the present method are compared with experimental data and other solutions. It is shown that the MHEM provides more accurate solutions of the wave forces than other numerical methods do. Therefore, the methodology presented herein can be used in the design of coastal and ocean structures. 展开更多
关键词 hybrid element method wave forces numerical analysis platform
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Nonlinear effect on inertia component of wave forces on a cylinder 认领 引用
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作者 Li Yanbao and Song Reng 《Acta Oceanologica Sinica》 SCIE CAS 1995年第3期429-437,共9页
A series of experiments on wave forces on a cylinder have been carried out when inertia component isdominant for a small she cylinder. The influence of nonlinear effect on the inertia component of wave forces on a cyl... A series of experiments on wave forces on a cylinder have been carried out when inertia component isdominant for a small she cylinder. The influence of nonlinear effect on the inertia component of wave forces on a cylinder is analyzed. The applicable range of nonlinear wave theories, such as Stokes and cnoidal wave theories, in calculating wave forces on a cylinder is discussed. A correction method is suggested for linear wave theory in calculated waveforces on a cylinder under the nonlinear condition. 展开更多
关键词 Wave forces on cylinder inertia component Stokes wave cnoidal wave
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Numerical Simulation of Solitary Wave Forces on A Vertical Cylinder on A Slope Beach 认领 引用 被引量：1
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作者 KUAI Yan-rong ZHOU Ji-fu +1 位作者 DUAN Jin-long WANG Xu 《China Ocean Engineering》 SCIE EI CSCD 2021年第3期317-331,共15页
Wave forces acting on a vertical cylinder at different locations on a slope beach in the near-shore region are investigated considering solitary waves as incoming waves.Based on the Reynolds-averaged Navier-Stokes equ... Wave forces acting on a vertical cylinder at different locations on a slope beach in the near-shore region are investigated considering solitary waves as incoming waves.Based on the Reynolds-averaged Navier-Stokes equations and the k-ε turbulence model,wave forces due to the interaction between the solitary wave and cylinder are simulated and analyzed with different incident wave heights and cylinder locations.The numerical results are first compared with previous theoretical and experimental results to validate the model accuracy.Then,the wave forces and characteristics around the cylinder are studied,including the velocity field,wave surface elevation and pressure.The effects of relative wave height,Keulegan-Carpenter(KC)number and cylinder locations on the wave forces are also discussed.The results show that the wave forces exerted on a cylinder exponentially increase with the increasing incident wave height and KC number.Before the wave force peaks,the growth rate of the wave force shows an increasing trend as the cylinder moves onshore.The cylinder location has a notable effect on the wave force on the cylinder in the near-shore region.As the cylinder moves onshore,the wave force on the cylinder initially increases and then decreases.For the cases considered here,the maximum wave force appears when the cylinder is located one cylinder diameter below the still-water shoreline.Furthermore,the fluid velocity peaks when the maximum wave force appears at the same location. 展开更多
关键词 wave force cylinder location Reynolds-averaged Navier–Stokes equations solitary wave numerical simulation
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Wave Forces on Submerged Semi-Circular Breakwater and Similar Structures 认领 引用 被引量：18
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作者 XIE Shileng 《China Ocean Engineering》 SCIE EI 1999年第1期63-72,共10页
The results of design and experiment of a submerged semi-circular breakwater at the Yangtze estuary show that the submerged structure will be unsafe when the general empirical wave force formula for semi-circular brea... The results of design and experiment of a submerged semi-circular breakwater at the Yangtze estuary show that the submerged structure will be unsafe when the general empirical wave force formula for semi-circular breakwater is used in design.Therefore,a new calculation method for the wave forces acting on a submerged semi-circular structure is given in this paper,in which the wave force acting on the inside circumference of semi-circular arch is included,and the phase modification coefficient in the general empirical formula is adjusted as well.The new wave force calculation method has been Verified by the results of seven related physical model tests and adopted in the design of the south esturary jetty of the first stage project of Deep Channel Improvement Project of the Yangtze River Estuary,the total jetty length being 17.5 km. 展开更多
关键词 semi-circular breakwater submerged structure estuary jetty wave force
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