二維沖箱式造波機的間隙和形狀效應數值研究

作者：Amir H.Nikseresht,Harry B.Bingham

摘要：The installation of plunger-type wave makers in experimental tanks will generally include a gap between the back of the wedge and the wall of the tank.In this study,we analyze the influence of this gap on the wave making performance of the plunger using two-dimensional(2 D)CFD calculations for a range of nearly linear wave conditions and compare the results with both experimental measurements and linear potential flow theory.Three wedge-shaped profiles,all with the same submerged volume,are considered.Moreover,the generated waves are compared with the predictions of linear potential flow theory.The calculations are made using the commercial ANSYS FLUENT finite-volume code with dynamic meshes to solve the Navier-Stokes equations and the volume of fluid scheme to capture the air-water interface.Furthermore,the linear potential flow solution of Wu(J Hydraul Res 26:481-493,1988)is extended to consider an arbitrary profile and serve as a reference solution.The amplitude ratios of the generated waves predicted by the CFD calculations compare well with the predictions of linear potential flow theory for a simple wedge,indicating that viscous effects do not influence this ratio for small-amplitude motions in 2 D.By contrast,significant higher harmonic components are produced by larger amplitude motions.Also,the simple wedge is found to produce the smallest spurious higher harmonic content in the far-field wave.

發文機構：Department of Mechanical Engineering Department of Mechanical Engineering

關鍵詞：WavemakerPlunger-typeBerkeleywedgeHyperbolicsineprofileGapDynamicmeshVolumeoffluidWave makerPlunger-typeBerkeley wedgeHyperbolic sine profileGapDynamic meshVolume of fluid

分類號： O35[理學—流體力學]