Tutorial allplan 2012
Warning: 3D is usually a large computational problem, avoid if at all possible!! Make use of symmetries to get to 2D or 2D axisymmetric. 1.ĭecide on the representative physics (choose the PDE). I will focus on acoustics as an application, but the steps are similar for other physics. Highly flexible… allows you to program in your own differential equations if they are not already implemented. Focuses on “Multiphysics” – coupling different physics together (e.g. Integrates well with Matlab (uses Matlab syntax too). Post-process the results to find the information you want.įinite Element Packages - Here are some of the common onesĬomsol Multiphysics - More recent than Ansys, Nastran, Abaqus. Choose a solver and solve for the unknowns. Choose an element type and mesh the geometry. Set the boundary conditions (for static or steady state problems) and initial conditions (for transient problems). Set the “material properties”… that is, all the constants that appear in the PDE. Define the geometry on which to solve the problem. Decide on the representative physics (choose the PDE).Ģ. So, this is always the sequence for any FEA problem: 1. The shape is now “meshed” with triangle elements. 4) Post-processing – looking at the solution in various ways. 3) Choice of solver (direct, iterative, preconditioning). 2) Choice of element type - shape (triangle, quadrilateral, etc.), number of nodes (3, 4, 5, 8, etc.) and shape function (linear, quadratic, etc.). The Finite Element Part: 1) Discretization of the space into pieces (the elements) – this is called the Mesh. du/dn) – “Natural Boundary Condition” or “Neumann Boundary Condition” 3) The relationship between the dependent variable and its normal derivative (e.g. u) – “Essential Boundary Condition” or “Dirichlet Boundary Condition” 2) The derivative of the variable itself (e.g. On each boundary you must specify either: 1) The dependent variable itself (e.g. The Mathematical Problem: Boundary Conditions. Independent Variables – space and time (x,y,z,t) Dependent Variables – unknown field (such as u) Boundary conditions (for static or steady state problems) and initial conditions (for transient problems). Numerical Solution of Partial Differential Equations (PDEs). White, Comsol Acoustics Introduction, © 2012