Identification of Method, Material & Boundary¶
The different elements of the model are specified using labels. Differents structures keep track of those labels:
elem.model(n)
type of modelling for the n-th elementedge_msh(n,3)
type of boundary for the n-th edgeelem.label(n)
identifier for the material (can be set in the FreeFEM++ mesher)
Types of numerical models¶
Label | Solving Method |
---|---|
1 | FEM on TR6 (6 nodes triangles) |
2 | FEM on H12 (3 nodes triangles with Hermite splines interpolation) |
3 | FEM on TR3 (3 nodes triangles) |
10 | DGM on Triangles |
11 | DGM on Rectangles |
Tip
The meshes between FEM and DGM can be incompatible.
Types of media¶
Label | Media |
---|---|
0 | Air |
1XXX | Elastic medium |
2XXX | Equivalent fluid (rigid frame) material |
3XXX | Limp model |
4XXX | Poroelastic Material (or FEM with 1998 formulation) |
5XXX | Biot (or FEM with 2001 formulation) |
80xy | PML (with x and y boolean direction) |
Types of boundaries¶
Label | Type of Boundary |
---|---|
1 | Rigid wall |
2 | Unit pressure (fluid) |
3 | Unit normal velocity |
4 | Unit tangential velocity |
5 | Sliding (PEM) |
6 | Bonded (PEM) or clamped (elastic) |
7 | Unit pressure (PEM) |
8 | Unit normal velocity (PEM) |
9 | Unit tangential velocity (PEM) |
10 | Incident air plane wave on acoustic/Biot98 element |
11 | Incident air plane wave on elastic element |
12 | Incident air plane wave on Biot 2001 element |
13 | DtN plate (Dirichlet to Neumann) |
20 | Transmitted air plane wave on acoustic/Biot 98 element |
21 | Transmitted air plane wave on elastic element |
21 | Transmitted air plane wave on Biot 2001 element |
60 | Unit normal velocity on H12 with flux application |
61 | DGM radiative boundary |
98 | Periodicity left |
99 | Periodicity right |
4xx | ZOD even/odd |
400 | FSI (Fluid-Structure interaction) |
1xyz | Excitation wave 1 angle xyz in degree (PEM) |
2xyz | Excitation wave 2 angle xyz in degree (PEM) |
3xyz | Excitation wave 3 angle xyz in degree (PEM) |
500 | Velocity diffracion cylindre FEM |