O463.1 2003021588轴对称电子光学系统空间的自动网格划分=Mesh-autodivisingmethod for space of electronic optical systems[刊,中]/赵国庆(电子科技大学物理电子学院.四川,成都(610054)),王文祥//电子科技大学学报.—2002,31(1).—4...O463.1 2003021588轴对称电子光学系统空间的自动网格划分=Mesh-autodivisingmethod for space of electronic optical systems[刊,中]/赵国庆(电子科技大学物理电子学院.四川,成都(610054)),王文祥//电子科技大学学报.—2002,31(1).—44-47提出了一种轴对称电子光学系统空间子午面上的网络自动划分方法,开发了自适应边界网格划分处理程序,可以对任意边界形状的封闭轴对称电子光学系统区域自动以较小网格间距划分,得到空间区域的网格点各参数,为进一步用计算机数值计算求解拉普拉斯方程或泊松方程(五点法)打下基础。简化了电子光学系统边界资料的输入及简化调整边界形状和网络间距过程,通过计算。展开更多
In order to predict the local scour hole and its evaluation around a cylindrical bridge pier, the computational fluid dynamics （CFD） and theories of sediment movement and transport were employed to carry out numeric...In order to predict the local scour hole and its evaluation around a cylindrical bridge pier, the computational fluid dynamics （CFD） and theories of sediment movement and transport were employed to carry out numerical simulations. In the numerical method, the time-averaged Reynolds Navier-Stokes equations and the standard k-e model were first used to simulate the three-dimensional flow field around a bridge pier fixed on river bed. The transient shear stress on river bed was treated as a crucial hydrodynamic mechanism when handling sediment incipience and transport. Then, river-bed volumetric sediment transport was calculated, followed by the modification of the river bed altitude and configuration. Boundary adaptive mesh technique was employed to modify the grid system with changed river-bed boundary. The evolution of local scour around a cylindrical bridge pier was presented. The numerical results represent the flow pattern and mechanism during the pier scouring, with a good prediction of the maximum scour hole depth compared with test results.展开更多
文摘O463.1 2003021588轴对称电子光学系统空间的自动网格划分=Mesh-autodivisingmethod for space of electronic optical systems[刊,中]/赵国庆(电子科技大学物理电子学院.四川,成都(610054)),王文祥//电子科技大学学报.—2002,31(1).—44-47提出了一种轴对称电子光学系统空间子午面上的网络自动划分方法,开发了自适应边界网格划分处理程序,可以对任意边界形状的封闭轴对称电子光学系统区域自动以较小网格间距划分,得到空间区域的网格点各参数,为进一步用计算机数值计算求解拉普拉斯方程或泊松方程(五点法)打下基础。简化了电子光学系统边界资料的输入及简化调整边界形状和网络间距过程,通过计算。
基金Project(50978095) supported by the National Natural Science Foundation of ChinaProject(IRT0917) supported by the Program for Changjiang Scholars and Innovative Research Team in Chinese UniversityProject supported by China Scholarship Council
文摘In order to predict the local scour hole and its evaluation around a cylindrical bridge pier, the computational fluid dynamics （CFD） and theories of sediment movement and transport were employed to carry out numerical simulations. In the numerical method, the time-averaged Reynolds Navier-Stokes equations and the standard k-e model were first used to simulate the three-dimensional flow field around a bridge pier fixed on river bed. The transient shear stress on river bed was treated as a crucial hydrodynamic mechanism when handling sediment incipience and transport. Then, river-bed volumetric sediment transport was calculated, followed by the modification of the river bed altitude and configuration. Boundary adaptive mesh technique was employed to modify the grid system with changed river-bed boundary. The evolution of local scour around a cylindrical bridge pier was presented. The numerical results represent the flow pattern and mechanism during the pier scouring, with a good prediction of the maximum scour hole depth compared with test results.
