PHOENICS GRID TYPES

PHOENICS supports three formats for grid definitions; cartesian, polar and body fitted coordinates (BFC). This interface will always produce a BFC grid definition even if the mesh could be expressed in terms of PIL statements. The grid written will be multiblock or monoblock.

Techniques for generating grids that are acceptable to PHOENICS are discussed in section 3.2. If a grid does not conform to the rules outlined in that section, the interface will issue an error message and stop, see Appendix C.

If a grid is two dimensional the thickness or angle and the number of cells can be specified using the FEMGEN physical properties command. Boundary conditions can therefore be attached to lines instead of surfaces.

The previous version of the PHOENICS interface required bodies to be stacked in a regular manner and to maintain connectivity. The multiblock interface only requires that the grid is continuous. The MESHING MERGE command can be used to ensure this.