检索结果-南通市图书馆

grid convergence study in the resistance calculation of a trimaran

Journal of Marine Science and Application 2008年第3期7卷 174-178页

作者：陈康黄德波李云波 College of Shipbuilding Engineering Harbin Engineering University Shanghai Merchant Ship Design & Research Institute

As a new type of hull form,trimaran has remarkable excellent performances and has drawn more and more *** the viscous CFD technology now available is applied to the research of resistance performance of trimaran,the spatial discretization would usually result in the grid error and uncertainty,and thus the considerable discrepancy between the numerical results and the experimental *** order to ascertain how much the grid would affect the calculation,the grid convergence should be studied.A mathematical trimaran was chosen as an example,with the commercial code CFX for the simulation,VOF for surface treatment,and the grid study was carried out based on two different turbulence *** was concluded that carrying out grid study is helpful in estimating the grid error and uncertainty,and indicating the direction of improving the credibility of the numerical calculation, and,in addition to grid errors and uncertainties,the turbulence modeling errors and uncertainties contribute to the simulation errors.

关键词： trimaran resistance CFD technology grid convergence study grid errors and uncertainties

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Accuracy analysis of gradient reconstruction on isotropic unstructured meshes and its effects on inviscid flow simulation

引用

Advances in Aerodynamics 2019年第1期1卷 348-378页

作者： Nianhua Wang Ming Li Rong Ma Laiping Zhang State Key Laboratory of Aerodynamics China Aerodynamics Research and Development CenterMianyang 621000China Computational Aerodynamics Institute China Aerodynamics Research and Development CenterMianyang 621000China

The accuracy of gradient reconstruction methods on unstructured meshes is analyzed both mathematically and *** derivations reveal that,for gradient reconstruction based on the Green-Gauss theorem(the GG methods),if the summation of first-and-lower-order terms does not counterbalance in the discretized integral process,which rarely occurs,second-order accurate approximation of face midpoint value is necessary to produce at least first-order accurate ***,gradient reconstruction based on the least-squares approach(the LSQ methods)is at least first-order on arbitrary unstructured *** are performed on typical isotropic grid stencils by analyzing the relationship between the discretization error of gradient reconstruction and the discretization error of the face midpoint value approximation of a given analytic ***,the numerical accuracy of gradient reconstruction methods is examined with grid convergence study on typical isotropic *** verify the phenomenon of accuracy degradation for the GG methods when the face midpoint value condition is not *** LSQ methods are proved to be at least first-order on all tested isotropic *** study gradient accuracy effects on inviscid flow simulation,solution errors are quantified using the Method of Manufactured Solutions(MMS)which was validated before adoption by comparing with an exact solution case,i.e.,the 2-dimensional(2D)inviscid isentropic *** results demonstrate that the order of accuracy(OOA)of gradient reconstruction is crucial in determining the OOA of numerical *** accuracy deteriorates seriously if gradient reconstruction does not reach first-order.

关键词： Finite volume discretization Unstructured grids Gradient reconstruction Accuracy analysis The method of manufactured solutions grid convergence study

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：