Author :
Publisher :
Page : 90 pages
File Size : 50,86 MB
Release : 1980
Category : Aerodynamics, Transonic
ISBN :
Author : Warren H. Weatherill
Publisher :
Page : pages
File Size : 16,97 MB
Release : 1980
Category :
ISBN :
Author :
Publisher :
Page : 96 pages
File Size : 30,24 MB
Release : 1979
Category :
ISBN :
Author :
Publisher :
Page : 88 pages
File Size : 24,24 MB
Release : 1980
Category : Aerodynamics, Transonic
ISBN :
Author : F. Edward Ehlers
Publisher :
Page : 156 pages
File Size : 27,95 MB
Release : 1982
Category : Flutter (Aerodynamics)
ISBN :
Author : James D. Sebastian
Publisher :
Page : 98 pages
File Size : 49,35 MB
Release : 1978
Category : Aerodynamics, Transonic
ISBN :
Author :
Publisher :
Page : 590 pages
File Size : 31,63 MB
Release : 1992
Category : Aeronautics
ISBN :
Author : F. Edward Ehlers
Publisher :
Page : 88 pages
File Size : 33,63 MB
Release : 1974
Category : Aerodynamics, Transonic
ISBN :
A finite difference method for the solution of the transonic flow about a harmonically oscillating wing is presented. The partial differential equation for the unsteady transonic flow was linearized by dividing the flow into separate steady and unsteady perturbation velocity potentials and by assuming small amplitudes of harmonic oscillation. The resulting linear differential equation is of mixed type, being elliptic or hyperbolic whereever the steady flow equation is elliptic or hyperbolic. Central differences were used for all derivatives except at supersonic points where backward differencing was used for the streamwise direction. Detailed formulas and procedures are described in sufficient detail for programming on high speed computers. To test the method, the problem of the oscillating flap on a NACA 64A006 airfoil was programmed. The numerical procedure was found to be stable and convergent even in regions of local supersonic flow with shocks.
Author : Warren H. Weatherill
Publisher :
Page : 100 pages
File Size : 19,73 MB
Release : 1978
Category :
ISBN :
Author : National Aeronautics and Space Administration (NASA)
Publisher : Createspace Independent Publishing Platform
Page : 92 pages
File Size : 11,78 MB
Release : 2018-07-08
Category :
ISBN : 9781722345419
A finite difference method for solving the unsteady transonic flow about harmonically oscillating wings is investigated. The procedure is based on separating the velocity potential into steady and unsteady parts and linearizing the resulting unsteady differential equation for small disturbances. The differential equation for the unsteady potential is linear with spatially varying coefficients and with the time variable eliminated by assuming harmonic motion. Difference equations are derived for harmonic transonic flow to include a coordinate transformation for swept and tapered planforms. A pilot program is developed for three-dimensional planar lifting surface configurations (including thickness) for the CRAY-XMP at Boeing Commercial Airplanes and for the CYBER VPS-32 at the NASA Langley Research Center. An investigation is made of the effect of the location of the outer boundaries on accuracy for very small reduced frequencies. Finally, the pilot program is applied to the flutter analysis of a rectangular wing. Weatherill, Warren H. and Ehlers, F. Edward Unspecified Center...
