solution methds-applied computational fluid dynamicssolution methods-applied computational fluid dynamicssolution methods-applied computational fluid dynamicssolution methods-applied computational fluid dynamics.ppt
- 1、本文档共45页,可阅读全部内容。
- 2、有哪些信誉好的足球投注网站(book118)网站文档一经付费(服务费),不意味着购买了该文档的版权,仅供个人/单位学习、研究之用,不得用于商业用途,未经授权,严禁复制、发行、汇编、翻译或者网络传播等,侵权必究。
- 3、本站所有内容均由合作方或网友上传,本站不对文档的完整性、权威性及其观点立场正确性做任何保证或承诺!文档内容仅供研究参考,付费前请自行鉴别。如您付费,意味着您自己接受本站规则且自行承担风险,本站不退款、不进行额外附加服务;查看《如何避免下载的几个坑》。如果您已付费下载过本站文档,您可以点击 这里二次下载。
- 4、如文档侵犯商业秘密、侵犯著作权、侵犯人身权等,请点击“版权申诉”(推荐),也可以打举报电话:400-050-0827(电话支持时间:9:00-18:30)。
查看更多
solution methds-applied computational fluid dynamicssolution methods-applied computational fluid dynamicssolution methods-applied computational fluid dynamicssolution methods-applied computational fluid dynamics
* Properties of numerical schemes All numerical schemes must have the following properties: Conservativeness: global conservation of the fluid property ? must be ensured. Boundedness: values predicted by the scheme should be within realistic bounds. For linear problems without sources, those would be the maximum and minimum boundary values. Fluid flow is non-linear and values in the domain may be outside the range of boundary values. Transportiveness: diffusion works in all directions but convection only in the flow direction. The numerical scheme should recognize the direction of the flow as it affects the strength of convection versus diffusion. The central differencing scheme does not have the transportiveness property. The other schemes that were discussed have all three of these properties. * Solution accuracy Higher order schemes will be more accurate. They will also be less stable and will increase computational time. It is recommended to always start calculations with first order upwind and after 100 iterations or so to switch over to second order upwind. This provides a good combination of stability and accuracy. The central differencing scheme should only be used for transient calculations involving the large eddy simulation (LES) turbulence models in combination with grids that are fine enough that the Peclet number is always less than one. It is recommended to only use the power law or QUICK schemes if it is known that those are somehow especially suitable for the particular problem being studied. * Pressure We saw how convection-diffusion equations can be solved. Such equations are available for all variables, except for the pressure. Gradients in the pressure appear in the momentum equations, thus the pressure field needs to be calculated in order to be able to solve these equations. If the flow is compressible: The continuity equation can be used to compute density. Temperature follows from the enthalpy equation. Pressure can then be calculated from
您可能关注的文档
- sas8.0软件安装指导书as8.0软件安装指导书sas8.0软件安装指导书sas8.0软件安装指导书.doc
- sas医学统计分析教程-1as医学统计分析教程-1sas医学统计分析教程-1sas医学统计分析教程-1.ppt
- s7-200 plc pp讲座课件s7-200 plc ppt讲座课件s7-200 plc ppt讲座课件s7-200 plc ppt讲座课件.ppt
- sas软件及统计应用教程9as软件及统计应用教程9sas软件及统计应用教程9sas软件及统计应用教程9.ppt
- sas软件与统计应用教程ss软件与统计应用教程sas软件与统计应用教程sas软件与统计应用教程.ppt
- sat例子写作如何准备(南sat教学 白松)sat例子写作如何准备(南京sat教学 白松)sat例子写作如何准备(南京sat教学 白松)sat例子写作如何准备(南京sat教学 白松).doc
- sas中用到的sql语法及构sas中用到的sql语法及结构sas中用到的sql语法及结构sas中用到的sql语法及结构.doc
- sch(s)13-文件编号则sch(s)13-文件编号规则sch(s)13-文件编号规则sch(s)13-文件编号规则.doc
- sccm2007安装部署指sccm2007安装部署指南sccm2007安装部署指南sccm2007安装部署指南.doc
- sdh本地网光缆传输工程设规范sdh本地网光缆传输工程设计规范sdh本地网光缆传输工程设计规范sdh本地网光缆传输工程设计规范.ppt
- (4篇)XX区抓党建促基层治理培训心得体会汇编12.docx
- 汇编1154期-在培训班上的讲话汇编(3篇).doc
- 汇编1173期-专题党课讲稿汇编(3篇)112.doc
- 汇编1076期-主题党课讲稿汇编(3篇).doc
- 汇编1177期-学习心得体会汇编(3篇)112.doc
- (6篇)党和国家机构改革心得体会汇编.docx
- 汇编1166期-坚定理想信念、全面从严治党、担当作为专题党课讲稿汇编(3篇)112.doc
- 汇编1174期-专题党课讲稿汇编(3篇)112.doc
- 教育13期-主题教育学习心得体会、研讨发言材料参考汇编(3篇).doc
- 汇编1458期-心得体会研讨发言提纲参考汇编(3篇)123.doc
文档评论(0)