Three Dimensional Supersonic Flow Past Blunt Bodies - Numerical Methods and Computations


Book Description

Methods for computing numerically the flow past blunted bodies of revolution travelling at supersonic speeds and at angles of attack are developed, using finite difference schemes. Results are shown for a given configuration at two supersonic Mach Numbers for which circumferential pressure distribution is given as well as the lift slope coefficient. To achieve greater computational efficiency a different method was introduced - one based on mapping the body into a line (in the 2-D case) or a rectangle. This was tested so far on the axisymmetric case. (Author).




The Calculation of Three-Dimensional Supersonic Flows Around Spherically-Capped Smooth Bodies and Wings. Volume II. Manual for Computer Programs


Book Description

I ;Powers, Sidney A. ;NOR-72-87-Vol-2F33615-72-C-1429AF-1366AFFDLTR-72-91-Vol-2See also Volume 1, AD-753 695.(*airframes, *supersonic characteristics), (*computer programs, aerodynamics), numerical analysis, conical bodies, delta wings, instruction manuals, blunt bodies, hypersonic characteristics, angle of attack, three dimensional flow, subroutinescomputer aided analysis, smooth bodies, inviscid flowThe report describes the theories, the numerical methods and the computer programs developed for determining the inviscid three-dimensional flow about smooth shapes at supersonic speeds. Volume II is a user's manual for the computer programs and provides the detailed information needed to set up and use the programs. These programs can determine the supersonic flow past smooth blunted bodies for any angle of attack for which the initial value surface remains on the blunted nose. The lowest usable Mach number is on the order of 2.0, with lower values attainable by careful attention to the initial value surface solution. There is no computational upper limit on the Mach number. (Author).










Supersonic Flow Past a Family of Blunt Axisymmetric Bodies


Book Description

Some 100 numerical computations have been carried out for unyawed bodies of revolution with detached bow waves. The gas is assumed perfect with y=5/3, 7/5, or 1. Free-stream Mach numbers are taken as 1.2, 1.5, 2, 3, 4, 6, 10, and [infinity symbol]. The results are summarized with emphasis on the sphere and paraboloid.




The Numerical Computations of Supersonic Flow Past Blunt Bodies


Book Description

Methods for computing numerically the flow past blunted bodies travelling at supersonic speed are developed, using finite difference schemes. The algorithms were constracted to deal witn 2-D axisymmetric and 3-D configuration. Various configurations were investigated and the flow field around them computed. Comparison with available semi-empirical results for blunted cones at Mach number 3 shows good agreement. The 3-D algorithm was applied to an axisymmetric configuration and the results thus obtained show good agreement with the axisymmetric calculation. All the calculations are for the inviscid gas-dynamic case. (Author).




Three-dimensional Inviscid Flow about Supersonic Blunt Cones at Angle of Attack


Book Description

The solution for the steady three-dimensional inviscid flow about supersonic blunt cones at angle of attack is obtained by coupling a direct time-dependent solution for the subsonic portion of the shock layer with steady state numerical afterbody solution. An outline is given covering the coupling scheme and the use of the resulting Fortran computer code.










Numerical Methods for Predicting Subsonic, Transonic and Supersonic Flow


Book Description

The methods available for numerical computation of subsonic, transonic and supersonic flows are discussed and comments are included on the characteristics of the popular methods. Both inviscid and viscous computation methods are addressed. A brief account of the basic approaches for developing methods initiates the discussion. Also included is a general summary of the state of the art of computational methods along with suggested approaches for solving problems in each area. The report is included with recommendations for future study and development. (Author).