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Fast generation of three-dimensional computational boundary-conforming periodic grids of C-typeA fast computer program, GRID3C, was developed to generate multilevel three dimensional, C type, periodic, boundary conforming grids for the calculation of realistic turbomachinery and propeller flow fields. The technique is based on two analytic functions that conformally map a cascade of semi-infinite slits to a cascade of doubly infinite strips on different Riemann sheets. Up to four consecutively refined three dimensional grids are automatically generated and permanently stored on four different computer tapes. Grid nonorthogonality is introduced by a separate coordinate shearing and stretching performed in each of three coordinate directions. The grids are easily clustered closer to the blade surface, the trailing and leading edges and the hub or shroud regions by changing appropriate input parameters. Hub and duct (or outer free boundary) have different axisymmetric shapes. A vortex sheet of arbitrary thickness emanating smoothly from the blade trailing edge is generated automatically by GRID3C. Blade cross sectional shape, chord length, twist angle, sweep angle, and dihedral angle can vary in an arbitrary smooth fashion in the spanwise direction.
Document ID
19820020377
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Dulikravich, D. S. (Universities Space Research Association Columbia, MD, United States)
Date Acquired
September 4, 2013
Publication Date
June 1, 1982
Subject Category
Aerodynamics
Report/Patent Number
NASA-CR-165596
NAS 1.26:165596
Accession Number
82N28253
Funding Number(s)
PROJECT: RTOP 505-32-52
CONTRACT_GRANT: NAS3-22532
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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