groundDist.H

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License
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Class
    groundDist
 
Description
    Calculation of distance to nearest wall for all cells and boundary.
    Uses meshWave to do actual calculation.
 
    Distance correction:
 
    if correctWalls = true:
    For each cell with face on wall calculate the true nearest point 
    (by triangle decomposition) on that face and do that same for that face's
    pointNeighbours. This will find the true nearest distance in almost all
    cases. Only very skewed cells or cells close to another wall might be
    missed.
 
    For each cell with only point on wall the same is done except now it takes
    the pointFaces() of the wall point to look for the nearest point.
 
    Note: correct() : for now does complete recalculation. (which usually is
    ok since mesh is smoothed). However for topology change where geometry in
    most of domain does not change you could think of starting from the old
    cell values. Tried but not done since:
    - meshWave would have to be called with old cellInfo. This is List<wallInfo>
    of nCells.
    - cannot construct from distance (y_) only since we don't know a value 
    for origin_. (origin_ = GREAT already used to denote illegal value.)
    - so we would have to store a List<wallInfo> which unfortunately does not
    get resized/mapped automatically upon mesh changes.
 
SourceFiles
    groundDist.C
 
Modified from general wallDistance to distance from specified patches by David Segersson
Swedish Meteorological and Hydrological Institute, david.segersson@smhi.se
 
\*---------------------------------------------------------------------------*/
 
#ifndef groundDist_H
#define groundDist_H
 
#include "volFields.H"
#include "cellDistFuncs.H"
 
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace Foam
{
 
class fvMesh;
 
/*---------------------------------------------------------------------------*\
                           Class groundDist Declaration
\*---------------------------------------------------------------------------*/
 
class groundDist
:
    public volScalarField,
    public cellDistFuncs
{
 
 
private:
 
    // Private Member Data
 
        //- Do accurate distance calculation for near-wall cells.
        bool correctWalls_;
 
        //- Number of unset cells and faces.
        label nUnset_;
 
 
    // Private Member Functions
 
        //- Disallow default bitwise copy construct
        groundDist(const groundDist&);
 
        //- Disallow default bitwise assignment
        void operator=(const groundDist&);
 
 
public:
 
    // Constructors
 
        //- Construct from mesh and flag whether or not to correct wall.
        //  Calculate for all cells. correctWalls : correct wall (face&point)
        //  cells for correct distance, searching neighbours.
        groundDist(const fvMesh& mesh, labelHashSet patchIDs, bool correctWalls = true);
 
    // Destructor
 
        virtual ~groundDist();
 
 
    // Member Functions
 
        const volScalarField& y() const
        {
            return *this;
        }
 
        label nUnset() const
        {
            return nUnset_;
        }
 
        //- Correct for mesh geom/topo changes
        virtual void correct(labelHashSet patchIDs);
};
 
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
} // End namespace Foam
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#endif
 
// ************************************************************************* //