实验室水槽内基于二阶理论的波浪模拟

Wave generation based on second-order theory in laboratory flume

实验室常用的一阶造波理论中的小振幅假设会在造波时生成附加的自由伪谐波,该波浪会影响造波的质量,而二阶造波方法可以通过附加造波板运动消除该自由伪谐波。文章基于Sch?ffer建立的二阶造波理论,建立了实验室水槽造波软件,针对规则波和不规则波,分别采用一阶和二阶理论进行推板造波实验,验证了二阶造波方法的有效性,二阶造波方法可有效抑制自由伪谐波,得到更精确的波形,并对采用二阶造波理论产生波浪时的问题进行了讨论。

The small-amplitude assumption of first-order wavemaker theory in laboratory will generate addi-tional spurious free-wave which will affect the quality of the wave, while second-order wave generation is able toeliminate the spurious free-wave by attaching wave board movement. In this paper, wave generation software in labo-ratory flume was established based on the second-order wavemaker theory built by Sch？ffer. Using a piston-typewavemaker, a number of laboratory wave experiments for regular and irregular waves with first-order and second-or-der theory were conducted. The results verify the effectiveness of the second-order wave generation that it can sup-press spurious free-wave effectively and get a more accurate waveform. In addition, the problems in second-orderwavemaker theory were discussed.