A review of recent and historical work in the field of transonic and supersonic ground effect aerodynamics has been conducted, focussing on applied research on wings and aircraft, present and future ground transportation, projectiles, rocket sleds and other related bodies which travel in close ground proximity in the compressible regime. Methods for ground testing are described and evaluated, n...

A novel uncertainty propagation method for problems characterized by highly non-linear or discontinuous system responses is presented. The approach is based on a Padé–Legendre (PL) formalism which does not require modifications to existing computational tools (nonintrusive approach) and it is a global method. The paper presents a novel PL method for problems in multiple dimensions, which is non...

This article presents analytical and computational analysis of the influence of the wind tunnel walls on transonic airfoil tests. The goal is to quantify the effects of the wind tunnel walls and characterize the key parameters affecting the flow field in order to construct a numerical model to realize experimental data corrections. Firstly, the experimental data are compared with well-documente...

In this paper we present a unigrid multi–model formulation for transonic flow calculations based on solving, in sequence, the full potential equation and the the Euler equations. The goal is to minimize the overall computation time to simulate steady flows by using a more computational efficient physical model in the early iteration steps. The proposed method is based on two steps. In the first...

An experimental study executed in the NPU NF-6 transonic wind tunnel on shock oscillations over SC(2)-0714 airfoil is presented. Tests are conducted at freestream Mach number from 0.72 to 0.82, Reynolds number based on the airfoil chord change from approximating 3.0 million to 5.0 million with transition strip fixed at 28% chord length. Limited span wise pressure distributions are obtained to v...

The aim of this article is a qualitative analysis of two modern finite volume (FVM) schemes. First one is the so called Modified Causon’s scheme, which is based on the classical MacCormack FVM scheme in total variation diminishing (TVD) form, but is simplified in such a way that the demands on computational power are much smaller without loss of accuracy. Second one is implicit WLSQR (Weighted ...

Princeton University, Princeton, NJ This paper desribes a technique for finding the numerical solution of the Full Potential equation for steady transonic flow about airfoils. The exterior but finite domain is discretized by breaking it up into triangles. Difference equations are formulated using variational principle and a formula for the derivative in an arbitrary polygon. The iterative schem...

SUMMARY The Denton two-dimensional and three-dimensional time marching blade-to-blade computer programs have been used at NGTE to analyse the flow past transonic turbine blading. In this work experience has been gained in operating the programs and this paper describes the major findings in respect of how the programs have performed. Solutions for several blade sections, giving Mach number dist...

by Mohammed S. Kamel Reliable prediction of optical wavefront distortions induced by compressible turbulent flow surrounding an aperture is crucial to the development of airborne laser systems. Large-eddy simulation (LES) with a wall model provides a promising highfidelity simulation method for high-Reynolds-number aero-optical flows by avoiding the severe near-wall resolution requirement. In t...