共查询到19条相似文献，搜索用时 140 毫秒
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分段式造波机生成波的方法和特性 总被引：2，自引：0，他引：2
本文叙述了分段式造波机生成波的理论和方法，通过试验确定了造波板前过渡段的长度，研究了分段式造波机生成波浪的特性，并将规则波的试验结果与理论结果进行了比较，给出了有效实验区的范围，可供实际应用时参考。 相似文献
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应用基于势流理论的时域高阶边界元方法,建立一个完全非线性的三维数值波浪水槽,通过实时模拟推板造波运动的方式产生波浪。通过混合欧拉-拉格朗日方法和四阶Runge-Kutta方法更新自由水面和造波板的瞬时位置。利用所建模型分别模拟了有限水深波和浅水波,与试验结果、相关文献结果和浅水理论结果吻合较好,且波浪能够稳定传播。系统地讨论造波板的运动圆频率、振幅和水深等对波浪传播和波浪特性的影响,并对波浪的非线性特性进行分析,研究发现造波板运动频率、运动振幅以及水深均将对波浪形态和波浪非线性产生显著影响。结果为真实水槽造波机的运动控制以及波浪生成试验提供了依据,便于实验室设置更合理的参数来准确模拟不同条件下的波浪。 相似文献
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提出了一种新型内波造波方法——箱内垂荡板式造波。应用 FLUENT 软件的有限体积法,采用 k-ε两方程湍流模型封闭 RANS 方程作为求解控制方程,建立二维数值内波水槽。通过模仿物理造波机运动的数值模拟结果比较表明：箱内垂荡板式造波机生成的内波与理论解十分吻合,与双板联动式造波和平板拍击式造波相比,控制简单,对自由水面的扰动小,对水槽水深的变化和分层界面位置的改变适应性好,不会造成分层水体的掺混。 相似文献
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用ＯｐｅｎＦＯＡＭ 实现数值水池造波和消波 总被引：2，自引：2，他引：0
基于OpenFOAM求解器interDyMFoam,开发实现数值水池造波(包括推板和摇板造波)和阻尼消波。所编写的造波边界条件,可依据实验造波理论将各种造波模式植入其中,从而实现各种波的数值造波。首先进行了线性波的数值造波实验,通过结合阻尼消波段的应用,造波水池可提供稳定的线性波。还进行了瞬时极限波和有限振幅的数值造波实验,与实验数据或同类数值结果吻合很好,进一步验证了的数值造波和消波方式的可靠性。 相似文献
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多向不规则波有效试验区的扩展法 总被引：3，自引：2，他引：3
实验室中一般采用分段式造波机来产生斜向或多向波，但其中存在几个问题，最主要的是有效试验区较小。扩大有效试验区的常用方法是采用边墙反射法。本文首先叙述了应用边墙反射产生斜向波和多向波的方法，通过物理模型试验对该方法进行了验证，试验结果表明采用边墙反射的确可以扩大有效试验区的范围。 相似文献
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利用特征函数展开法对台阶式变深水槽中推板式造波机造波问题进行了研究，建立了相应速度势和波面的解析表达式。与高阶边界元方法(HOBEM)数值结果进行了对比，验证了本解析解的正确性。通过数值试验，研究了台阶对入射波的影响，同时分析了造波板所在位置（上部台阶）水深、水槽工作区（下部台阶）水深、造波板运动周期和造波板水平位置等因素对生成波浪高度的影响。由此选择合适的造波板所在位置及水深来得到所需要的波浪高度，进而根据需要生成波浪的周期和波幅 来反演造波板的运动。 相似文献
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Active Absorption Wave Maker System for Irregular Waves 总被引：2，自引：0，他引：2
1 .IntroductionThephysicalmodeltestisoneofthemainmethodstostudyvariousproblemsassociatedwiththedesignofcoastalstructures .Thecommonlyusedwavemakeristhepiston typewavemaker .Becausethewavemakerishighlyreflective ,akeyproblemisthewavemultiplereflectionsbetweenthewavemakerandthetestedstructuresinthewaveflume .There reflectedwavesfromthewavemakerarespuriouswavesrelativetotheincidentwavestothestructures .Howtopreventthere reflectedwavesfromthewavemakerbecomesacriticalproblemforaccurateexperimental… 相似文献
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根据线性系统理论,首先由给定的靶谱模拟海浪信号,再把此信号转换为造波控制输入信号,最后在水槽中指定的截面处产生具有给定靶谱的随机波。这种模拟方法已在青岛海洋大学物理海洋实验室的大型水槽中实现,并取得良好的效果。 相似文献
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直立式防波堤堤头在斜向波浪作用下波浪力的计算在现行的技术规范中尚属空白。通过物理模型试验给出了堤头结构设计所需的波压分布图，指出了波浪入射方向和地形对堤头所受波浪力的贡献有时可以超过波高和波周期，根据现行规范按波浪正向入射计算堤头所受的波浪力偏于安全。 相似文献
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A numerical model for wave propagation in a harbour is verified by use of physical models.The extended time-dependent mild slope equation is employed as the governing equation,and the model is solved by use of ADI method containing the relaxation factor.Firstly,the reflection coefficient of waves in front of rubble-mound breakwaters under oblique incident waves is determined through physical model tests,and it is regarded as the basis for simulating partial reflection boundaries of the numerical model.Then model tests on refraction,diffraction and reflection of waves in a harbour are performed to measure wave height distribution.Comparative results between physical and numerical model tests show that the present numerical model can satisfactorily simulate the propagation of regular and irregular waves in a harbour with complex topography and boundary conditions. 相似文献
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WANG Yongxue ZANG Jun QIU Dahong Professor the State Key Laboratory of Coastal Offshore Engineering Dalian University of Technology Dalian P. R. China
Lecturer the State Key Laboratory of Coastal Offshore Engineering Dalian University of Technology Dalian P. R. China
Professor Academician of Chinese Academy of Sciences the State Key Laboratory of Coastal Offshore Engineering Dalian University of Technology Dalian P. R. China 《中国海洋工程》1999,(4)
The volume of fluid(VOF)method is used to set up a wave flume with an absorbing wavemaker of cnoidal waves.Based on the transfer function between wave surface and paddle velocity obtained bythe shallow water wave theory,the velocity boundary condition of an absorbing wave maker is introduced toabsorb reflected waves that reach the numerical wave maker.For H/d ranging from 0.1 to 0.59 and T(g/d)~(1/2)from 7.9 to 18.3,the parametric studies have been carried out and compared with experiments. 相似文献
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Second-order wave maker theory has long been established; the most extensive and detailed approach given by Schäffer [1996. Second-order wave maker theory for irregular waves. Ocean Engineering 23, 47–88]. However, all existing theories assume the wave paddle is driven by a position-feedback motion controller. Early research in the wave power field led to the design of a force-controlled absorbing wave machine [Salter, S., 1982. Absorbing wave-makers and wide tanks. In: Directional Wave Spectra Applications, pp. 185–200]. In addition to operating as an excellent absorber, this machine seemed to introduce very little spurious harmonic content when driven with a first-order command signal. The present paper provides a mathematical model for the operation of wave makers using force-feedback control and seeks to explain this apparent advantage. The model is developed to second-order so that a command signal compensating for the remaining spurious wave is also provided. Due to the complexity of the problem, the model has been limited to flap-type wave machines and the generation of regular waves. A variety of numerical tests in force-control mode have been conducted, indicating that the spurious wave content is greatly reduced when compared to the position-control mode. A separate experimental study validating the theory is presented in a part II paper by the same authors. 相似文献
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In this paper,a numerical model is developed based on the High Order Spectral(HOS) method with a non-periodic boundary.A wave maker boundary condition is introduced to simulate wave generation at the incident boundary in the HOS method.Based on the numerical model,the effects of wave parameters,such as the assumed focused amplitude,the central frequency,the frequency bandwidth,the wave amplitude distribution and the directional spreading on the surface elevation of the focused wave,the maximum generated wave crest,and the shifting of the focusing point,are numerically investigated.Especially,the effects of the wave directionality on the focused wave properties are emphasized.The numerical results show that the shifting of the focusing point and the maximum crest of the wave group are dependent on the amplitude of the focused wave,the central frequency,and the wave amplitude distribution type.The wave directionality has a definite effect on multidirectional focused waves.Generally,it can even out the difference between the simulated wave amplitude and the amplitude expected from theory and reduce the shifting of the focusing points,implying that the higher order interaction has an influence on wave focusing,especially for 2D wave.In 3D wave groups,a broader directional spreading weakens the higher nonlinear interactions. 相似文献
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西北太平洋夏季海浪数值模拟研究 总被引：1，自引：0，他引：1
为了解第三代海浪模式SWAN在西北太平洋海浪模拟效果,利用2013年7月期间Jason-2卫星高度计观测资料,通过计算模拟值和观测值的绝对误差、均方根误差和进行逐日统计、分级统计、一次台风过程的统计,对FNL风场资料驱动SWAN模式的西北太平洋海浪数值模拟有效波高进行了检验。检验结果表明,模式对较小波高模拟效果较好,模拟波高与实测值误差在可接受的范围之内,可满足业务化预报的要求,但对较大波高的模拟存在一定的误差,且驱动风场的精细化水平直接影响模拟效果。 相似文献
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Choi Young-Kwang Seo Seung-Nam Choi Jin-Yong Shi Fengyan Park Kwang-Soon 《海洋学报(英文版)》2019,38(7):36-47
A wave forecasting system using FUNWAVE-TVD which is based on the fully nonlinear Boussinesq equations by Chen(2006) was developed to provide an accurate wave prediction in the Port of Busan, South Korea. This system is linked to the Korea Operational Oceanographic System(KOOS) developed by Park et al.(2015). The computational domain covers a region of 9.6 km×7.0 km with a grid size of 2 m in both directions, which is sufficient to resolve short waves and dominant sea states. The total number of grid points exceeds 16 millions,making the model computational expensive. To provide real-time forecasting, an interpolation method, which is based on pre-calculated results of FUNWAVE-TVD and SWAN forecasting results at the FUNWAVE-TVD offshore boundary, was used. A total of 45 cases were pre-calculated, which took 71 days on 924 computational cores of a Linux cluster system. Wind wave generation and propagation from the deep water were computed using the SWAN in KOOS. SWAN results provided a boundary condition for the FUNWAVE-TVD forecasting system. To verify the model, wave observations were conducted at three locations inside the port in a time period of more than 7 months. A model/model comparison between FUNWAVE-TVD and SWAN was also carried out. It is found that, FUNWAVE-TVD improves the forecasting results significantly compared to SWAN which underestimates wave heights in sheltered areas due to incorrect physical mechanism of wave diffraction, as well as large wave heights caused by wave reflections inside the port. 相似文献