Differences in inviscid isentropic models used for finite difference calculation of transonic flow with shocks about airfoils; the prediction of wave drag

Properties of inviscid isentropic flow models underlying finite difference methods for the calculation of two-dimensional transonic flows with embedded shocks about airfoils are discussed and compared. Attention is drawn to the fact that the isentropic time-dependent model described by Magnus and Yoshihara and the isentropic model used in...

Verslag van een bezoek aan de "AIAA Computational Fluid Dynamics Conference" (19 en 20 juli, 1973) en de "Computational Fluid Dynamics Branch, NASA Ames" (23 juli, 1973)

In het kader van NIVR opdracht nr. 1739 is door de betrokken NLR medewerker de AIAA Computational Fluid Dynamics Conference op 19 en 20 Juli 1973 in Palm Springs, California, bijgewoond, terwijl tevens een werkbezoek werd gebracht sian de Computational Fluid Dynamics Branch van het NASA Ames Research Center op 23 Juli 1973. Tijdens de eerder...

On inviscied isentropic flow models used for finite difference calculations of two-dimensional transonic flows with embedded shocks about airfoils

Properties of inviscid isentropic flow models underlying finite difference methods for the calculation of two-dimensional transonic flows with embedded shocks about airfoils are discussed and compared. Attention is drawn to the fact that the isentropic time-dependent model described by Magnus and Yoshihara and the isentropic model used in...

Voorstellen betreffende de toepassing van de eindige elementen-methode op enkele vliegtuig-aerodynamische problemen

Berekening van transsone storingen stromingen om profielen met voorgeschreven geometrie met behulp met behulp van differentiemethoden

Stiffness matrix for a tapered spar element

A class of tapered spar elements is developed and tested. Especially the effect of warping of the cross-section under transverse shear load and the influence of allowing the deflection to vary over the depth of the spar are investigated.

The propagation of elastic waves in circular cylindrical shells of sandwich-type

In studies concerning the sound transmitting properties of circular cylindrical shells the radial motions which propagate in the direction of the shell axis are of primary interest (ref 4). So-called coincidence occurs when the velocity of the sound waves along the cylinder equals the propagation speed of free travelling elastic flexural wavel...