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 |