BMSweep: Locating interior nodes during sweeping

BMSweep is a new algorithm to determine the location of interior nodes whil e generating hexahedral meshes using the volume sweeping method. Volume swe eping is performed on two and one half-dimensional volumes by identifying a 'source' surface which is meshed with quadrilaterals. These quadrilaterals are then swept through the volume towards a 'target' surface generating la yers of hexahedra along the way. BMSweep uses background mesh interpolation to locate interior nodes during sweeping. The interpolation method provide s for quality element creation, while allowing the volume boundary to vary. The cross-section of the volume can vary along the length of the sweep, th e sweep path need nor be linear, and the source and target areas need not b e flat. Three dimensional volumes can be swept using BMSweep after being de composed into two and one half-dimensional sub-volumes.