Meshless CFD

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 August 17, 2003, 06:53 Meshless CFD #1 Des Aubery Guest   Posts: n/a Hi all, I saw a web-site that specialises in 'Meshless CFD'. Is anyone able to update me on what this is? Thanks for your assistance. Sincere regards, Des Aubery... (adTherm Technology - web: www.adtherm.com)

 August 17, 2003, 08:42 Re: Meshless CFD #2 Praveen Guest   Posts: n/a There are two different approaches which are called meshless. One contains methods like surface panel methods, boundary element methods, etc. which do not contain a volume grid. The other type of methods which are called meshless are those which use an arbitrary distribution of points in the computational domain. Particle methods also belong to this category where the particles themselves act as discretization points. The method is called meshless because the points need not form any grid; they do not have to be arranged in any particular manner. The main motivation of meshless methods is that generating a mesh for a complex 3-d configuration is very time-consuming while it is much easier to generate a point mesh. In fact Rainald Lohner says that it is an order of magnitude faster to generate a point distribution than a mesh and he has developed an advancing front point generation technique. The accuracy of grid-based methods depends on the quality of the grid and so you have to ensure orthogonality, or make sure that elements are not highly skewed, while meshless methods are not very much affected by how the points are distributed. There are many practical applications of meshless methods:problems involving multiple bodies in relative motion structural problems which involve tracking the growth of a crack; with meshless methods you can just add more points around the crack to resolve it better. free surface flow problems simulation of airbag deployment phenomena in car industry You can see some links at the bottom of this page. For an overview of many meshless methods see the review paper by Ted Belytschko.

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