Accession Number : AD0738792

Title :   PDQ-1, Partial, Differential Equation Solution, Graphics Version I.

Descriptive Note : Technical memo.,

Corporate Author : PICATINNY ARSENAL DOVER N J

Personal Author(s) : Isakower,Robert I. ; Barnas,Robert E.

Report Date : JAN 1972

Pagination or Media Count : 52

Abstract : PDQ 1 is an interactive graphics solution to an important class of second order linear partial differential equations (Laplace and Poisson). Finite difference approximations are made of the derivatives, in cartesian coordinates, employing a generalized irregular star for the computation stencil. Program options include variable grid size, curved boundaries, 'mirror' boundary edges for repeating sections, and hard copy (plotter) of problem domain with contour maps of selected values of the solved variable. Use of the program is illustrated with problems in electric field potential distribution, torsion of bars, and steady state temperature distribution. PDQ 1 was written for a CDC 6500/1700/274 facility operating under SCOPE 3.3, IGS V.2 employing 10 overlays and 50K bytes of storage. (Author)

Descriptors :   (*COMPUTER PROGRAMMING, GRAPHICS), (*PARTIAL DIFFERENTIAL EQUATIONS, POTENTIAL THEORY), (*BOUNDARY VALUE PROBLEMS, NUMERICAL INTEGRATION), CONTINUUM MECHANICS, DIFFERENCE EQUATIONS, NUMERICAL ANALYSIS, HEAT TRANSFER, TORSION

Subject Categories : Theoretical Mathematics
      Computer Programming and Software
      Computer Hardware

Distribution Statement : APPROVED FOR PUBLIC RELEASE