Vortex Tubes in Turbulent Flows: Identification, Representation, Reconstruction (2006)
Banks, David C., Singer, Bart A.
In many cases the structure of a fluid flow is well-characterized by its vortices, especially for the purpose of visualization. In this paper we present a new algorithm for identifying vortices in...
A Predictor-Corrector Scheme for Vortex Identification (2006)
Singer, Bart A., Banks, David C.
A new algorithm for identifying and characterizing vortices in complex flows is complex flows is presented. The scheme uses both the vorticity and pressure fields. A skeleton line along the center of...
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...
Boundary Layer Transition On Slender Cones In Conventional (2002)
Thomas J. Horvath, Scott A. Berry, Brian R. Hollis, Chau-lyan Chang, Bart A. Singer
An experimental investigation was conducted on a 5-degree half-angle cone and a 5-degree half-angle flared cone in a conventional Mach 6 wind tunnel to examine the effects of facility noise on...
Thomas J. Horvath, Scott A. Berry, Brian R. Hollis, Chau-lyan Chang, Bart A. Singer
An experimental investigation was conducted on a 5-degree half-angle cone and a 5-degree half-angle flared cone in a conventional Mach 6 wind tunnel to examine the effects of facility noise on...
Aiaa 2002-3346 The Current Status Of Unsteady Cfd Approaches For Aerodynamic (2002)
Mark H. Carpenter, Bart A. Singer, Nail Yamaleev, Veer N. Vatsa, Sally A. Viken, Harold L. Atkins
An overview of the current status of time dependent algorithms is presented. Special attention is given to algorithms used to predict #uid actuator #ows, as well as other active and passive#ow...
Aiaa 2002-3346 The Current Status Of Unsteady Cfd Approaches For Aerodynamic (2002)
Mark H. Carpenter, Bart A. Singer, Nail Yamaleev, Veer N. Vatsa, Sally A. Viken, Harold L. Atkins
An overview of the current status of time dependent algorithms is presented. Special attention is given to algorithms used to predict fluid actuator flows, as well as other active and passive flow...
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...
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,...
TS - Dean Interactions in Curved Channel Flow. (1998)
Singer, Bart A., Zang, Thomas A., Erlebacher, Gordon
A weakly nonlinear theory is developed to study the interaction of Tollmien - Schlichting waves and Dean vortices in curved channel flow. The predictions obtained from the theory agree well with...
Report Documentation Page (1998)
(Maximum 200 words) The current status of transition-region models is reviewed in this report. To understand modeling problems, various flow features that influence the transition process are...
A Predictor-Corrector Technique for Visualizing Unsteady Flow. (1997)
Banks, David C., Singer, Bart A.
We present a method for visualizing unsteady flow by displaying its vortices. The vortices are identified by using a vorticity-predictor pressure-corrector scheme that follows vortex cores. The...
NASA Contractor Report 198297 (Corrected Copy Dec. 1996) (1996)
Models for the distribution of the wall-pressure under a turbulent boundary layer often estimate the coherence of the cross-spectral density in terms of a product of two coherence functions. One such...
NASA Contractor Report 198297 (Corrected Copy Dec. 1996) (1996)
Models for the distribution of the wall-pressure under a turbulent boundary layer often estimate the coherence of the cross-spectral density in terms of a product of two coherence functions. One such...
A Predictor-Corrector Technique for Visualizing Unsteady Flow (1995)
David C. Banks, Bart A. Singer
We present a method for visualizing unsteady flow by displaying its vortices. The vortices are identified by using a vorticity-predictor pressure-corrector scheme that follows vortex cores. The...
Metamorphosis of a Hairpin Vortex into a Young Turbulent Spot (1995)
Bart A. Singer, Ronald D. Joslin
Direct numerical simulation was used to study the formation and growth of a hairpin vortex in a flat-plate boundary layer and its later development into a young turbulent spot. Fluid injection...
Vortex Tubes in Turbulent Flows: Identification, Representation, Reconstruction (1994)
David C. Banks, Bart A. Singer
In many cases the structure of a fluid flow is well-characterized by its vortices, especially for the purpose of visualization. In this paper we present a new algorithm for identifying vortices in...
Thesis (Ph. D.)--Stanford University, 1987.