- 期刊
應用多重網格系統建置之三維數值波浪模式及其應用
DEVELOPMENT AND APPLICATION OF A 3-D NUMERICAL WAVE MODEL BASED ON A MULTI-BLOCK GRID SYSTEM
摘要
本研究應用多重網格系統建置三維數值波浪模式，並模擬波浪通過海上結構物之流場演變及結構物受力特性。為適切模擬黏性流體之運動，本研究求解三維時變Navier-Stokes方程式，搭配大渦模擬之紊流模式。模式採用等位函數法，計算波浪複雜之液面變化。在流固耦合計算上，於卡氏座標系統中沿用自主研發之流固耦合技術（Huang等人﹝1﹞），計算不規則固體邊界附近之流場。為確立本模式之準確性，本研究進行數值驗證，包括三維空穴流場（3D lid-driven cavity flow）及孤立波通過圓柱測試等，驗證結果皆令人滿意。在確立模式準確性後，本研究探討波浪通過風機基樁後之流場分布特性及基樁受力情形。
並列摘要
In this work, a three-dimensional (3D) numerical wave model based on a multi-block grid system was developed and applied to simulate the flow and pressure fields induced by water waves propagating over offshore structures. The unsteady, 3D Navier-Stokes equations were solved to simulate the viscous flow fields. The turbulence effects were modeled by large-eddy simulation (LES). The complex free surface configuration was captured by the level set method. The solid-fluid coupling method of Huang et al. [1] was employed to treat the interface between the fluid and solid boundary of irregular shape based on Cartesian grids. The proposed numerical model was applied to simulate the 3D lid-driven cavity flow and the wave fields induced by a solitary wave past a vertical circular cylinder. The good agreement between the numerical results and experimental data verifies the accuracy of the proposed 3D numerical wave model. Finally, the developed wave model was applied to simulate the wave propagation over an offshore mono-pile structure. The vortices on the lee-side of the pile could be observed in the numerical wave tank.