![]() Nodes are scattered within the problem domain and also the set of nodes are scattered on the boundaries of the domain to represent (not discretize) the problem domain and its boundaries. However this may not be feasible for all the cases as they hold limitations for complex geometries and hence a third approach was developed for CFD analysis called as "Meshless CFD".Ī Meshless method is used to establish a system of algebraic equations for the whole problem domain without the use of a predefined mesh for the domain discretization. Using the automated meshing approach the user has to provide basic inputs regarding cell size and zones to be meshed and the solver takes care of the grid generation. Grid generation is performed manually by majority of practitioners though there have been recently additions of softwares with automated meshing features. Not only the generation of a good grid but also its maintenance is an onerous task that can dictate factors like: These cells are grouped to form boundary zones and then boundary conditions are applied on these zones. ![]() This entire process of breaking up a physical domain into smaller sub-domains (elements/ cells) is called as meshing or grid generation. All the flow variables & any other variables are solved at centres of these discrete cells. Mesh or grid is defined as a discrete cell or elements into which the domain/ model is divided. This blog shall provide you an introduction and update about the popular meshless methods available today. Meshless methods thus provide a viable alternative to grid-based flow computation as they are supposed to not require the conventional grid structure and thereby relieving the many issues specifically related to grid generation step. Though much progress has been made in terms of algorithm accuracy and speed over the last three decades, generating grids step for complex, real world computations still remains the most time consuming and least reliable component of CFD simulation process. A most common complaint often cited by computational fluid dynamics practitioners is the generation of a good quality computational mesh and is estimated to be costing about 70% of the entire simulation cycle.
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