Mehdi R. Khorrami, Meelan Choudhari, Bart A. Singer, David P. Lockard, Craig L. Streett
The synergistic use of experiments and numerical simulations can uncover the underlying physics of airframe noise sources. We focus on the high-lift noise component associated with a leading-edge...
This paper presents a comparison between two implementations of the Ffowcs Williams and Hawkings equation for airframe noise applications. Airframe systems are generally moving at constant speed and...
M. Khorrami, B. Singer, D. Lockard, Mehdi R. Khorrami, Bart A. Singer, David P. Lockard
Unsteady computational simulations of a multi-element, high-lift configuration are performed. Emphasis is placed on accurate spatio-temporal resolution of the free shear layer in the slat-cove...
Evaluation of the Lattice-Boltzmann Equation Solver PowerFLOW for Aerodynamic Applications (2002)
Li-shi Luo, Bart A. Singer, David P. Lockard, Li-shi Luo T, A. Singer
A careful comparison of the performance of a commercially available Lattice-Boltzmann Equa- tion solver (PowerFLOW) was made with a conventional, block-structured computational fluid-dynamics code...
An Application Of The Quadrature-Free Discontinuous Galerkin Method (1999)
David P. Lockard, Harold L. Atkins
This paper describes the application of the quadrature-free discontinuous Galerkin method to a two-dimensional shear layer problem. First, a brief description of the method is given. Next, the...
An Application Of The Quadrature-Free Discontinuous Galerkin Method (1999)
David P. Lockard, Harold L. Atkins
This paper describes the application of the quadrature-free discontinuous Galerkin method to a two-dimensional shear layer problem. First, a brief description of the method is given. Next, the...
IN SEARCH OF THE PHYSICS: NASA's APPROACH TO AIRFRAME NOISE (1999)
Michele G. Macaraeg, David P. Lockard, Craig L. Streett
An extensive numerical and experimental study of airframe noise mechanisms associated with a subsonic high-lift system has been performed at NASA Langley Research Center (LaRC). Investigations...
Harold L. Atkins, David P. Lockard
A method for the prediction of acoustic scatter from complex geometries is presented. The discontinuous Galerkin method provides a framework for the development of a high-order method using...
Efficient Implementations of the Quadrature-Free Discontinuous Galerkin Method (1999)
David P. Lockard, Harold L. Atkins
The efficiency of the quadrature-free form of the discontinuous Galerkin method in two dimensions, and briefly in three dimensions, is examined. Most of the work for constant-coefficient, linear...
David P. Lockard, Harold L. Atkins
The e#ciency of the quadrature-free form of the discontinuous Galerkin method in two dimensions, and brie#y in three dimensions, is examined. Most of the work for constant-coe#cient, linear problems...
Computational Aeroacoustic Analysis of Slat Trailing-Edge Flow (1999)
Th Aiaa/ceas Aeroacoustics, Bart A. Singer, David P. Lockard, Kenneth S. Brentner, Mehdi R. Khorrami, Mert E. Berkman, ...
this paper will conform to the schematic of the experimental setup shown in Fig. 1. The view in Fig. 1 has been rotated from the physical orientation to one that is more intuitive. An enormous amount...
Computational Aeroacoustic Analysis of Slat Trailing-Edge Flow (1999)
David P. Lockard, Th Aiaa/ceas Aeroacoustics, Bart A. Singer, Kenneth S. Brentner, Mehdi R. Khorrami, Mert E. Berkman, ...
this paper will conform to the schematic of the experimental setup shown in Fig. 1. The view in Fig. 1 has been rotated from the physical orientation to one that is more intuitive. An enormous amount...
AIAA 99-0231 Simulation of Acoustic Scattering from a Trailing Edge (1999)
Bart A. Singer, Kenneth S. Brentner, David P. Lockard, Geoffrey M. Lilley
stic directivity and Mach number scaling are shown. Introduction In the theory of aerodynamic noise developed by Lighthill 1, 2 turbulent fluctuations in free space are particularly inefficient...
Simulation of Acoustic Scattering from a Trailing Edge (1999)
David P. Lockard, Geoffrey M. Lilley, Bart A. Singer, Kenneth S. Brentner, Georey M. Lilley
ations showed acoustic waves emanating from the airfoil trailing edge. Acoustic directivity and Machnumber scaling are shown. Introduction In the theory of aerodynamic noise developed by Lighthill 1,...
IN SEARCH OF THE PHYSICS: NASA's APPROACH TO AIRFRAME NOISE (1970)
Michele G. Macaraeg, David P. Lockard, Craig L. Streett
An extensive numerical and experimental study of airframe noise mechanisms associated with a subsonic high-lift system has been performed at NASA Langley Research Center (LaRC). Investigations...