Download or read book Flow Over Airfoils in the Transonic Regime computer Programs written by Richard J. Magnus and published by . This book was released on 1970 with total page 360 pages. Available in PDF, EPUB and Kindle. Book excerpt: Digital computer programs for solving two problems are described. The first is for calculating planar inviscid transonic flow over an airfoil by a finite difference method and the second is for calculating the boundary layer on an airfoil for an arbitrary surface velocity distribution by an integral method. The report contains descriptions of the programs and subroutines, program listings and flow charts, and discussion of some of the program features. (Author).

Download or read book Computer Program for Steady Transonic Flow Over Thin Airfoils by Finite Elements written by S. T. K. Chan and published by . This book was released on 1975 with total page 99 pages. Available in PDF, EPUB and Kindle. Book excerpt: A finite element program is described for the analysis of subsonic and transonic flows over thin airfoils by solving the nonlinear transonic potential equation based on small disturbance theory. The present numerical algorithm uses the concept of finite elements in conjunction with the least square method of weighted residuals. Since the governing equation is of the elliptic-hyperbolic type, a 'one-sided assembly technique' was devised and adapted in the supersonic region to restore the directional property of the flow, which was removed by the exclusion of entropy from the transonic potential equation. The finite element discretization results in a system of banded nonlinear algebraic equations, which is solved by direct iterations. The elements presently used include triangles and quadrilaterals with the perturbed potential function and velocity components as nodal unknowns. Boundary conditions of both Dirichlet and Neumann types are therefore imposed conveniently. Secondary unknowns are computed directly without resorting to numerical differentiation. The computer program is separated into two parts: the first part (designated as STRANL-I) generates the necessary mesh information and, if desired, produces a mesh plot and optimal nodal numbering as well; STRANL-II carries out the analysis and displays the pressure coefficients along the chord line on printer plots. Two sample cases of flow over a NACA 64 A006 and a 6% thick circular arc are given.

Download or read book Computer Programs for Calculating Small Disturbance Transonic Flows about Oscillating Airfoils written by J. L. Farr (Jr.) and published by . This book was released on 1974 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt: Computer programs are described which implement a small disturbance potential flow theory for the two-dimensional unsteady transonic flow about thin airfoils undergoing low reduced frequency harmonic oscillations. The theory is based upon the treatment of the unsteady flow as a small perturbation to the steady transonic flow. Separating the perturbation potential into a steady and unsteady component results in a pair of coupled boundary value problems for the components. The governing equation for the steady perturbation potential is the usual nonlinear transonic potential equation and it is solved in computer program STRANS using the mixed differencing relaxation procedure of Murman and Cole. The governing equation for the unsteady perturbation potential is linear and, for the harmonic boundary disturbance considered, of mixed elliptic hyperbolic type depending on the local nature of the steady potential. Using a steady solution previously generated by STRANS, computer program UTRANS solves the unsteady potential equation by the same relaxation procedure. The solution procedures are found to be quite efficient, permitting the calculation of unsteady aerodynamic forces to engineering accuracy in a few minutes on a CDC 6600 computer.

Download or read book TRANDESNF written by Jen-Fu Chang and published by . This book was released on 1987 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book TRANDESNF A Computer Program for Transonic Airfoil Design and Analysis in Nonuniform Flow written by Jen-Fu Chang and published by . This book was released on 1987 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book NASA Technical Note written by and published by . This book was released on 1971 with total page 714 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book GRUMFOIL written by H. R. Mead and published by . This book was released on 1985 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt: A user's manual which describes the operation of the computer program, GRUMFOIL is presented. The program computes the viscous transonic flow over two dimensional airfoils using a boundary layer type viscid-inviscid interaction approach. The inviscid solution is obtained by a multigrid method for the full potential equation. The boundary layer solution is based on integral entrainment methods.

Download or read book Two dimensional Transonic Flow Past Airfoils written by Yung-Huai Kuo and published by . This book was released on 1951 with total page 54 pages. Available in PDF, EPUB and Kindle. Book excerpt: The problem of constructing solutions for transonic flow over symmetric airfoils is treated for simplification of the mapping of the incompressible flow is emphasized. In the case of a symmetric Joukowski airfoil without circulation the mapping is relatively simple, but the coefficients in the power series are difficult to evaluate. As a means of simplification an approximate flow is used which differs only slightly from the exact incompressible one when the thickness is small. Flow with circulation is also considered by the same method.

Download or read book TAIR A Transonic Airfoil Analysis Computer Code written by F. Carroll Dougherty and published by . This book was released on 1981 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1989 with total page 968 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book GRUMFOIL A Computer Code for the Viscous Transonic Flow Over Airfoils written by and published by . This book was released on 1985 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book NASA Technical Memorandum written by and published by . This book was released on 1971 with total page 146 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A Computer Program that Uses Interactive Graphics to Solve Inviscid Transonic Flows Over Lifting Airfoils written by and published by . This book was released on 1973 with total page 205 pages. Available in PDF, EPUB and Kindle. Book excerpt: A computer program that utilizes the method of integral relations has been developed at the Naval Ship Research and Development Center for use in determining the inviscid transonic flows past lifting airfoils. It allows for a change of entropy across the shock wave and accounts for the presence of an oblique or normal shock at the shock foot. Since many iteractions of the trial and error type are required to obtain the converged flow solution, the program has been adapted for use on the interactive graphic systems of the CDC 6700 computer. This minimizes the man-machine interaction time involved with such iterations. It has been applied to several airfoil cases with supercritical flow on the upper surface and subcritical flow on the lower surface. The theoretical basis for this program has previously been reported. This report documents the computer program which is written in the language of FORTRAN Extended Version 3. 0. (Author).

Download or read book Aeronautical Engineering written by and published by . This book was released on 1971 with total page 580 pages. Available in PDF, EPUB and Kindle. Book excerpt: A selection of annotated references to unclassified reports and journal articles that were introduced into the NASA scientific and technical information system and announced in Scientific and technical aerospace reports (STAR) and International aerospace abstracts (IAA)

Download or read book COSMIC Software Catalog written by and published by . This book was released on 1987 with total page 444 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Computer Program Abstracts written by and published by . This book was released on 1979 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Grumfoil a Computer Code for the Computation of Viscous Transonic Flow Over Airfoils written by R.E. Melnik and published by . This book was released on 1987 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt: