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Features of the CRISP CFD Mesh Adaptation Code
ELEMENTS SUPPORTED • Any combination of tetrahedra, pyramids, prisms, hexahedra
MESH MODIFICATION OPERATORS • Delaunay refinement and edge collapse for inviscid tetrahedra
• Cell subdivision for other element types
• Feature identification for surface mesh projection
VISCOUS GRID TREATMENTS • Identification and subdivision of boundary layer tetrahedra
• Cell subdivision through near wall prism layers, hexahedra
SOLUTION ADAPTATION • Solution error estimation via high order reconstruction
• Automated or user-defined selection criteria
MOVING MEASH ADAPTATION • 6-DOF relative motion of multiple bodies
• Single grid deforms to accommodate boundary motions
• Cell quality criterion assesses mesh deformation
• Adaptive treatments correct grid distortion
PARALLEL ADAPTATION • Parallel adaptation of decomposed grids
• Automated load rebalancing
• Automated interprocessor communication update
DEVELOPMENTAL • Mesh control techniques for transient applications
• Close coupling with flow solvers
• Feature identification for mixed element meshes

CRISP CFD® Code Overview
A grid adaption package, CRISP CFD, has been developed to work in conjunction with unstructured grids to provide an automated grid refinement and coarsening capability. Grid refinement is implemented using a Delaunay procedure where grids of higher density are generated locally in regions where the grid quality fails to meet user specified gradient resolution criteria. An edge bisection methods are employed in the refinement of prismatic and hexahedral cells. The grid adaption capability is illustrated for a simple missile configuration at a high angle-of-attack with local refinement to better capture flow separation and vortex roll-up.