How could I define the dimensions of an infinite box?

Yann_Le_Floch

The dimensions of the infinite box are defined by the user. This requires a certain experience because there is no general rule.

We can, however, give some advice:

• the distance between the device and the interior surface of the infinite box is at least equal to the dimension of the device in this direction;
• the dimensions of the infinite box are related to the mesh. In Flux 3D, the number of elements on the thickness of the box must be roughly equal (at least) to two (second-order elements) or to three (first-order elements);
• It is recommended to parameterize the dimensions of the infinite box to adjust its size during the meshing.

The mesh and the size of the infinite box must take into account the phenomena studied, and the computations to be performed as follows:

• If it is interesting to compute a global or a local quantity inside the device, it is unnecessary to refine the mesh of the infinite box;
• If on the contrary, if it is interesting to compute the field created outside the device, one should define a box of more significant size and refine the mesh inside.

You can find this information at the following URL in the online help.

C:\Altair\Flux_12.3\Help\Flux\english\Website\index.html