Boundary Conditions - worldcollegesinfo：边界条件worldcollegesinfo.pptVIP

下载本文档

26
0
约1.59万字
约 31页
2018-06-24 发布于四川
举报
版权申诉

Boundary Conditions - worldcollegesinfo：边界条件worldcollegesinfo.ppt

1、本文档共31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)。
5、该文档为VIP文档，如果想要下载，成为VIP会员后，下载免费。
6、成为VIP后，下载本文档将扣除1次下载权益。下载后，不支持退款、换文档。如有疑问请联系我们。
7、成为VIP后，您将拥有八大权益，权益包括：VIP文档下载权益、阅读免打扰、文档格式转换、高级专利检索、专属身份标志、高级客服、多端互通、版权登记。
8、VIP文档为合作方或网友上传，每下载1次，网站将根据用户上传文档的质量评分、类型等，对文档贡献者给予高额补贴、流量扶持。如果你也想贡献VIP文档。上传文档

Boundary Conditions - worldcollegesinfo：边界条件worldcollegesinfo

Lecture 6 - Boundary ConditionsApplied Computational Fluid Dynamics Instructor: André Bakker Outline Overview. Inlet and outlet boundaries. Velocity. Pressure boundaries and others. Wall, symmetry, periodic and axis boundaries. Internal cell zones. Fluid, porous media, moving cell zones. Solid. Internal face boundaries. Material properties. Proper specification. Boundary conditions When solving the Navier-Stokes equation and continuity equation, appropriate initial conditions and boundary conditions need to be applied. In the example here, a no-slip boundary condition is applied at the solid wall. Boundary conditions will be treated in more detail in this lecture. Overview Boundary conditions are a required component of the mathematical model. Boundaries direct motion of flow. Specify fluxes into the computational domain, e.g. mass, momentum, and energy. Fluid and solid regions are represented by cell zones. Material and source terms are assigned to cell zones. Boundaries and internal surfaces are represented by face zones. Boundary data are assigned to face zones. Neumann and Dirichlet boundary conditions When using a Dirichlet boundary condition, one prescribes the value of a variable at the boundary, e.g. u(x) = constant. When using a Neumann boundary condition, one prescribes the gradient normal to the boundary of a variable at the boundary, e.g. ?nu(x) = constant. When using a mixed boundary condition a function of the form au(x)+b?nu(x) = constant is applied. Note that at a given boundary, different types of boundary conditions can be used for different variables. Flow inlets and outlets A wide range of boundary conditions types permit the flow to enter and exit the solution domain: General: pressure inlet, pressure outlet. Incompressible flow: velocity inlet, outflow. Compressible flows: mass flow inlet, pressure far-field. Special: inlet vent, outlet vent, intake fan, exhaust fan. Boundary data required depends on physical models selected. General guide