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CAS2D: FORTRAN program for nonrotating blade-to-blade, steady, potential transonic cascade flowsAn exact, full-potential-equation (FPE) model for the steady, irrotational, homentropic and homoenergetic flow of a compressible, homocompositional, inviscid fluid through two dimensional planar cascades of airfoils was derived, together with its appropriate boundary conditions. A computer program, CAS2D, was developed that numerically solves an artificially time-dependent form of the actual FPE. The governing equation was discretized by using type-dependent, rotated finite differencing and the finite area technique. The flow field was discretized by providing a boundary-fitted, nonuniform computational mesh. The mesh was generated by using a sequence of conforming mapping, nonorthogonal coordinate stretching, and local, isoparametric, bilinear mapping functions. The discretized form of the FPE was solved iteratively by using successive line overrelaxation. The possible isentropic shocks were correctly captured by adding explicitly an artificial viscosity in a conservative form. In addition, a three-level consecutive, mesh refinement feature makes CAS2D a reliable and fast algorithm for the analysis of transonic, two dimensional cascade flows.
Document ID
19800018785
Acquisition Source
Legacy CDMS
Document Type
Technical Publication (TP)
Authors
Dulikravich, D. S. (NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
September 4, 2013
Publication Date
July 1, 1980
Subject Category
Aerodynamics
Report/Patent Number
NASA-TP-1705
E-253
Accession Number
80N27284
Funding Number(s)
PROJECT: RTOP 505-32
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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