shows how a cylinder can be approximated with the Cartesian coordinate system. When the boundary region of the flow does not coincide with the coordinate lines of the structured grid then we can solve the problem by geometry approximation. But most of the engineering problems deal with complex geometries that don’t work well in the Cartesian coordinate system. In this system the implementation of finite volume method is simpler and easier to understand. Most of the fluid flow equations are easily solved by discretizing procedures using the Cartesian coordinate system. Representation of 2-D model of flow around cylinder using cartesian grid. 2-D model of flow around cylinder Fig 1 b. But if the results vary with direction then we use large aspect ratio.įluid flow equation and coordinate system Fig 1 a.
Large aspect ratio has another limitation of leading to interpolation errors. For example, if the aspect ratio is large the speed of solver reduces while if this ratio is small the solver speed increases. the aspect ratio of element decide whether a particular element would be good to use or we should go for another element with different aspect ratio. They are typically based on aspect ratio i.e. The shape of the elements is of great importance in solving problems in computational fluid dynamics. Before defining the mesh type it is necessary to understand elements (their shape and size). They are simple polyhedron, geometrical polyhedron and multiple polyhedrons. In three dimensions there are three types of inputs. The two-dimensional meshing includes simple polygon, polygon with holes, multiple domain and curved domain. Meshing has applications in the fields of geography, designing, computational fluid dynamics. Mesh or grid can be in 3- dimension and 2-dimension. Grid or mesh is defined as smaller shapes formed after discretisation of geometric domain. ( August 2019) ( Learn how and when to remove this template message) Please help improve it to make it understandable to non-experts, without removing the technical details. This article may be too technical for most readers to understand.