extensions for PDRblockMesh

As noted off-line and EP1247, to be truly useful the PDRblockMesh requires an outer expansion zone. @pratap

changed milestone to %v2012

Extended the PDRblockMeshDict to include an optional outer definition. Example,

// Treatment of the outer region
outer
{
    type        sphere;     // (none | extend | box | sphere)  [default: none]
    onGround    true;       // Module on the ground?  [default: false]
    expansion   relative;   // (uniform | ratio | relative)  [default: ratio]

    ratios      1.1;

    size        3;          // Overall outer/inner size
    nCells      10;         // Number of cells for outer region

    // size       (3 4);
    // nCells     (10 12);
}

The meaning of the type:

none

No outer region (default)

extend

Extend the inner region in x/y/z directions by effectively adding additional sets of cells to the outside perimeter

box

Add an o-grid, with box-shape treatment

sphere

Add an o-grid, with sphere/spheroidal treatment

mentioned in issue #1907 (closed)

mentioned in commit 84b4f35e

mentioned in commit 8214b9d3

mentioned in commit 3ed8d88e

mentioned in commit cf3d983b

closed