# What is the difference between finite element and finite volume models?

### What is the difference between finite element and finite volume models?

However, the method finite volumes is based directly on the so-called strong form of the equation to be solved, whereas the method finite elements is based on a variational formulation of the equation (we also speak of a weak formulation).

### What is the principle of the finite difference method?

In numerical analysis, the finite difference method is a common technique for finding approximate solutions of partial differential equations who consists in solving a system of relations (numerical diagram) linking the values ​​of the unknown functions at certain points sufficiently close to each other…

### How to calculate the size of a mesh?

Move the slider to refine or coarsen the mesh or on the Options to specify a Size. This can be entered as a percentage of the calculated default size or as an absolute value at model scale. Or, Use surface mesh enhancement.

### What is the mesh in structural analysis?

That is to say that the structure is ”cut” into elements of geometric shapes 3D (volume) or 2D (shell) whose deformation potential is determined. The general deformation of the structure at the end of the convergence of the structural analysis is the sum of the deformations of each element (mesh).

### What is the meshing procedure?

The reliability of the structural analysis depends on the meshing procedure. The mesh must thus be carried out according to the geometry: number of elements in the thickness, in the fillets, around the bores.

### How to calculate mesh convergence?

A mesh convergence study is carried out with an nxn square mesh by taking n = 2, 4, 8, 16 and 32 plate elements. Figure 3 shows the displacement results which converge as the mesh density increases. Here are the results of the displacement norm: