A hybrid numerical method for the hydraulic modeling of a curtain-walled dissipater of reflected waves from breakwaters is presented. In this method, a zonal approach that combines a nonlinear weakly dispersive wave (...A hybrid numerical method for the hydraulic modeling of a curtain-walled dissipater of reflected waves from breakwaters is presented. In this method, a zonal approach that combines a nonlinear weakly dispersive wave (Boussinesq-type equation) method and a Reynolds-Averaged Navier-Stokes (RANS) method is used. The Boussinesq-type equation is solved in the far field to describe wave transformation in shallow water. The RANS method is used in die near field to resolve the turbulent boundary layer and vortex flows around the structure. Suitable matching conditions are enforced at the interface between the viscous and the Boussinesq region. The Coupled RANS and Boussinesq method successfully resolves the vortex characteristics of flow in the vicinity of the structure, while unexpected phenomena like wave re-reflection are effectively controlled by lengthening the Boussinesq region. Extensive results on hydraulic performance of a curtain-walled dissipater and the mechanism of dissipation of reflected waves are presented, providing a reference for minimization of die breadth of the water chamber and for determination of the submerged depth of the curtain wall.展开更多
以进水池模型为研究对象,探索有效的吸气涡控制方法,基于计算流体动力学(CFD)技术,分析消波板与幕墙2种方法对吸气涡的抑制效果,并重点研究关键几何参数的影响.采用开源CFD软件OpenFOAM进行数值模拟,基于三方程的Bifurcation湍流模型求...以进水池模型为研究对象,探索有效的吸气涡控制方法,基于计算流体动力学(CFD)技术,分析消波板与幕墙2种方法对吸气涡的抑制效果,并重点研究关键几何参数的影响.采用开源CFD软件OpenFOAM进行数值模拟,基于三方程的Bifurcation湍流模型求解湍流场以及CLSVOF方法捕捉气液交界面,从吸气涡形态、涡量、流线和出口吸气率等多角度对计算结果进行处理和对比分析.研究结果表明:深度为0.25 D 1的幕墙可以有效抑制进水池吸气涡,且吸气率可降低一半;随着幕墙深度增大,吸气率上升;参考海洋工程领域提出的消波板仅能推迟吸气涡的出现与发展,但无法起到抑制作用;在消波板中心位置和长度不变的情况下,改变消波板宽度均对吸气涡无明显抑制效果.研究结果可为进水池及相关工程设施优化设计提供一定的借鉴和参考.展开更多
基金This work was financially supported by the Trans-Century Training Program Fund for the Talent,Ministry of Education of China.
文摘A hybrid numerical method for the hydraulic modeling of a curtain-walled dissipater of reflected waves from breakwaters is presented. In this method, a zonal approach that combines a nonlinear weakly dispersive wave (Boussinesq-type equation) method and a Reynolds-Averaged Navier-Stokes (RANS) method is used. The Boussinesq-type equation is solved in the far field to describe wave transformation in shallow water. The RANS method is used in die near field to resolve the turbulent boundary layer and vortex flows around the structure. Suitable matching conditions are enforced at the interface between the viscous and the Boussinesq region. The Coupled RANS and Boussinesq method successfully resolves the vortex characteristics of flow in the vicinity of the structure, while unexpected phenomena like wave re-reflection are effectively controlled by lengthening the Boussinesq region. Extensive results on hydraulic performance of a curtain-walled dissipater and the mechanism of dissipation of reflected waves are presented, providing a reference for minimization of die breadth of the water chamber and for determination of the submerged depth of the curtain wall.
文摘以进水池模型为研究对象,探索有效的吸气涡控制方法,基于计算流体动力学(CFD)技术,分析消波板与幕墙2种方法对吸气涡的抑制效果,并重点研究关键几何参数的影响.采用开源CFD软件OpenFOAM进行数值模拟,基于三方程的Bifurcation湍流模型求解湍流场以及CLSVOF方法捕捉气液交界面,从吸气涡形态、涡量、流线和出口吸气率等多角度对计算结果进行处理和对比分析.研究结果表明:深度为0.25 D 1的幕墙可以有效抑制进水池吸气涡,且吸气率可降低一半;随着幕墙深度增大,吸气率上升;参考海洋工程领域提出的消波板仅能推迟吸气涡的出现与发展,但无法起到抑制作用;在消波板中心位置和长度不变的情况下,改变消波板宽度均对吸气涡无明显抑制效果.研究结果可为进水池及相关工程设施优化设计提供一定的借鉴和参考.