Papers & Reports
Recent Papers
CFD-based Computations of Flexible Helicopter Blades for Stability Analysis
This paper describes how the OVERFLOW code is applied to improve the accuracy of airload computations from the linear lifting line theory that uses displacements from the beam model. Results are demonstrated for the 4-bladed UH-60A helicopter, deviations of computed data from flight data are evaluated, and Fourier analysis post-processings suitable for aeroelastic stability computations are performed.
Guru P. Guruswamy
AIAA 2011-1875 Guruswamy (PDF-852 KB)
The Impact of Hyper-Threading on Processor Resource Utilization in Production Applications
This paper describes a study to understand performance issues with Intel hyper-threading (HT) technology used in three generations of Intel Xeon processors. Experiments indicate that hyper-threading can give a performance boost to some codes with specific characteristics; however, other codes may see a performance degradation.
Subhash Saini, Haoqiang Jin, Robert Hood, David Barker, Piyush Mehrotra and Rupak Biswas
IEEE HiPC 2011 (PDF-960KB)
Space-Time Accuracy Assessment of CFD Simulations for the Launch Environment
Time-accurate high-fidelity Computational Fluid Dynamics (CFD) simulations of the launch environment are an important part of the successful launch of new and existing space vehicles.
Jeffrey A. Housman and Michael F. Barad
AIAA 2011-3650 Housman, Barad, and Kiris (PDF-9.7MB)
Aerodynamic Database Generation for SRB Separation from a Heavy Lift Launch Vehicle
An engineering approach is presented for database generation of aerodynamic force and moment coefficients on Solid Rocket Boosters (SRBs) during separation from a Heavy Lift Launch Vehicle.
Marshall R. Gusman and Michael F. Barad
AIAA 2011-3651 Gusman, Kiris, and Barad (PDF-11.3MB)
Analysis of Grid Fins for Launch Abort Vehicle Using
a Cartesian Euler Solver
This paper conducts a numerical study of four sets of aerodynamic control surfaces, called grid fins, mounted on a full Launch Abort Vehicle geometry using a Cartesian Euler Solver with embedded boundaries and adjoint-driven adaptive meshing.
James E. Kless and Michael J. Aftosmis
AIAA 2011-3666 (PDF-5.26MB)
Code-to-Code Comparison of CFD/CSD Simulation for a Helicopter Rotor in Forward Flight
Two unsteady Reynolds-averaged Navier-Stokes solvers are used to compute the rotor airloads on the UH-60A rotorcraft at several flight conditions across the flight envelope.
Jasim Ahmad and Robert T. Biedron
AIAA 2011 Ahmad-I (PDF-1.80MB)
High-Order Accurate CFD/CSD Simulation of the UH-60 Rotor in Forward Flight
Time-dependent Reynolds-averaged Navier-Stokes simulations for a highly flexible aeroelastic UH-60A rotor have been carried out for forward flight.
Jasim U. Ahmad and Neal M. Chaderjian
AIAA 2011 Ahmad-II (PDF-2.81MB)
Space-Time Accuracy Assessment of CFD Simulations for the Launch Environment
Time-accurate high-fidelity Computational Fluid Dynamics (CFD) simulations of the
launch environment are an important part of the successful launch of new and existing space vehicles.
Jeffrey A. Housman and Michael F. Barad
AIAA 2011 Housman (PDF-9.23MB)
Aerodynamic Database Generation for SRB Separation from a Heavy Lift Launch Vehicle
An engineering approach is presented for database generation of aerodynamic force and moment coefficients on Solid Rocket Boosters (SRBs) during separation from a Heavy Lift Launch Vehicle.
Marshall R. Gusman and Michael F. Barad
AIAA 2011 Gusman-Barad (PDF-10.78MB)
Adjoint-Based Low-Boom Design with Cart3D
We consider analysis and design of low sonic-boom aircraft through the use of an inviscid, embedded-boundary Cartesian mesh method.
Michael J. Aftosmis and Marian Nemec
AIAA 2011-3500 (PDF-3.25MB)
Automation of Hole-Cutting for Overset Grids Using the X-rays Approach
Overset grids resolve complicated geometries by creating high quality structured grids that are independently built for each component.
Noah Kim and William M. Chan
AIAA 2011 Kim (PDF-13.61MB)
Analysis of Inviscid Simulations for the Study of Supersonic Retropropulsion
Supersonic retropropulsion (SRP) has been proposed as a candidate enabling technology for future high-mass Mars missions.
Noel M. Bakhtian and Michael J. Aftosmis
AIAA 2011 Baktian (PDF-35.61MB)
Computation of Sectional Loads from Surface Triangulation and
Flow Data
Traditionally, span-wise load distribution on a wing or the axial load distribution on a rocket is computed using approximations that utilize a combination of theory and empirical observations.
Shishir Pandya and William Chan
AIAA 2011 Pandya (PDF-1.74MB)
Computational Challenges in Simulating Powered Flight of the Orion Launch Abort Vehicle
Some of the simulation work performed by the computational aerosciences project under the NASA Constellation program is presented.
Stuart E. Rogers and Thomas H. Pulliam
AIAA 2011 Rogers (PDF-11.17MB)
Evaluation of Refined Tetrahedral Meshes with Projected, Stretched, and Sheared Prism Layers for Sonic Boom Analysis
Developing a Near-Field Cylindrically-Shaped, Mesh Projecting a Layered Cylindrically-Shaped Prism Mesh, Shearing & Stretching of the Prismatic Grid, Circumferential Refinement of Outer Prismatic Grid
Susan E. Cliff, Alaa A. Elmiligui, Richard L. Campbell, and Scott D. Thomas
AIAA 2011 Cliff (PDF-18.14MB)
Developments in Strategies and Software Tools for Overset Structured Grid Generation and Connectivity
Recent developments in strategies and software tools for overset structured grid generation and domain connectivity are described.
William M. Chan
AIAA 2011 Chan (PDF-3.97MB)
Recent Development of the NASA CAMVis for Tropical Cyclone Studies
A recent development within the Coupled Global Multiscale Modeling and Concurrent Visualization System (CAMVis) is discussed.
Bo-Wen Shen, Wei-Kuo Tao, and Bron Nelson
Earth Science Technology Forum 2011 (PDF-1.1MB)
Recent Direct Numerical Simulation of the Flow Around a Circulation Control Airfoil
A direct numerical simulation of the flow around a circulation control airfoil is described.
Nateri Madavan and Michael Rogers
AIAA 2010-4577 (PDF-278KB)
A Multi-Group Maximum Entropy Model for Thermo-Chemical Nonequilibrium
A multi-group model based on the maximum entropy principle is presented.
Yen Liu and Marcel Vinokur
AIAA 2010-4332 (PDF-1.3MB)
Automatic Tip Vortex Core Profiling for Numerical Flow
Simulations of Rotorcraft in Hover
An automated approach is presented that extracts visual and quantitative data from vortex cores produced by Navier-Stokes simulations of rotorcraft in hover mode.
David Kao and Neal Chaderjian
AIAA 2010-4752 (PDF-188KB)
NAS Technical Reports
Firewall Policy Query Tool Whitepaper
This paper describes how to create a firewall policy query tool that enables efficient discovery of firewall rules in large, complex, enterprise network environments, modeled after a tool that developed by the NASA Advanced Supercomputing Networks Team.
Nichole Boscia
NAS-11-001 (PDF-1.3MB)
Performance Analysis of Scientific and Engineering Applications Using MPInside and TAU
In this paper, authors present performance analysis of two NASA applications using performance tools such as Tuning and Analysis Utilities (TAU) and SGI MPInside. MITgcmUV and OVERFLOW are two production-quality applications used extensively by scientists and engineers at NASA.
Subhash Saini, Piyush Mehrotra, Kenichi Taylor, Sameer Shende, and Rupak Biswas
NAS-10-001 (PDF-1.25MB)
Reports Archive
Resource Acknowledgements
Notice to Investigators:
When you publish your research based on use of NAS/HECC resources, please acknowledge these in your paper, following the guidelines provided by NASA's High-End Computing Program.
