Accession Number : ADA268651


Title :   A New Procedure for Dynamic Adaptation of Three-Dimensional Unstructured Grids


Corporate Author : NATIONAL AERONAUTICS AND SPACE ADMINISTRATION MOFFETT FIELD CA AMES RESEARCH CENTER


Personal Author(s) : Biswas, Rupak ; Strawn, Roger


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a268651.pdf


Report Date : Jan 1993


Pagination or Media Count : 14


Abstract : A new procedure is presented for the simultaneous coarsening and refinement of three-dimensional unstructured tetrahedral meshes. This algorithm allows for localized grid adaption that is used to capture aerodynamic flow features such as vortices and shock waves in helicopter flowfield simulations. The mesh adaption algorithm is implemented in the C programming language and uses a data structure consisting of a series of dynamically-allocated linked lists. These lists allow the mesh connectivity to be rapidly reconstructed when individual mesh points are added and/or deleted. The algorithm allows the mesh to change in an anisotropic manner in order to efficiently resolve directional flow features. The procedure has been successfully implemented on a single processor of a Cray Y-MP computer. Two sample cam are presented involving three- dimensional transonic flow. Computed results show good agreement with conventional structured-grid solutions for the Euler equations.


Descriptors :   *HELICOPTERS , *TRANSONIC FLOW , ALGORITHMS , SIMULATION , COMPUTERS , SHOCK WAVES , COMPUTER PROGRAMMING , EULER EQUATIONS , DIRECTIONAL , AERODYNAMICS , PROGRAMMING LANGUAGES , GRIDS , VORTICES , MESH , THREE DIMENSIONAL


Subject Categories : Aerodynamics
      Fluid Mechanics


Distribution Statement : APPROVED FOR PUBLIC RELEASE