Accession Number : AD0705514

Title :   THE CHOICE OF A TIME-DEPENDENT TECHNIQUE IN GAS DYNAMICS.

Descriptive Note : Research rept.,

Corporate Author : POLYTECHNIC INST OF BROOKLYN FARMINGDALE N Y DEPT OF AEROSPACE ENGINEERING AND APPLIED MECHANICS

Personal Author(s) : Moretti,Gino

Report Date : JUL 1969

Pagination or Media Count : 80

Abstract : A definition of the word 'technique', as related to numerical computations of time-dependent problems in gas dynamics, is given. Requirements of accuracy, economy and flexibility are considered. A technique which attempts to satisfy them is presented. Emphasis is put on the consistency of the numerical procedure with the physical problem. The concepts of consistency, convergence and truncation error are reexamined. The advantages of recasting the equations in divergence form are denied. Certain breakdowns in accuracy occurring in regions of continuous flow are explained. The physical role played by discontinuities and its numerical counterpart are discussed. (Author)

Descriptors :   (*COMPRESSIBLE FLOW, *NUMERICAL ANALYSIS), CONVERGENCE, ACCURACY, EQUATIONS OF MOTION

Subject Categories : Aerodynamics
      Numerical Mathematics
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE