Proceedings ArticleDOI
Recent enhancements to OVERFLOW
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The purpose of this paper is to highlight some recent enhancements that have been made to the Navier-Stokes code OVERFLOW, in three major areas: a multigrid method, for convergence acceleration; a lowMach preconditioning algorithm, for converge acceleration and solution quality improvement for low Mach number flows; and a matrix dissipation algorithm for solution quality improved.Abstract:
The purpose of this paper is to highlight some recent enhancements that have been made to the Navier-Stokes code OVERFLOW. The enhancements we are concerned with are in three major areas: a multigrid method, for convergence acceleration; a lowMach preconditioning algorithm, for convergence acceleration and solution quality improvement for low Mach number flows; and a matrix dissipation algorithm for solution quality improvement. We will describe these methods and show examples of their efficacy.read more
Citations
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Proceedings ArticleDOI
Assessment of Turbulent Shock-Boundary Layer Interaction Computations Using the OVERFLOW Code
Anthony Oliver,Randolph P. Lillard,Alan Schwing,Gregory A. Blaisdell,Anastasios S. Lyrintzis +4 more
TL;DR: The performance of two popular turbulence models, the Spalart-allmaras model and Menter s SST model, and one relatively new model, Olsen & Coakley s Lag model, are evaluated using the OVERFLOWcode.
ReportDOI
Revolutionary Physics-Based Design Tools for Quiet Helicopters, Phase I-B Extension
TL;DR: In this article, a set of first-principles based computational modeling tools for analyzing and designing advanced helicopter configurations was developed, which involved incorporation of advanced numerical algorithms and turbulence models in OVERFLOW 2.
Proceedings ArticleDOI
Unsteady Low Mach Preconditioning with Application to Rotorcraft Flows
TL;DR: A modified low Mach number preconditioning algorithm for the unsteady Navier-Stokes equations is implemented within a diagonalized-implicit dual-time stepping framework and a novel blended artificial dissipation model is shown to be instrumental in preserving both accuracy and convergence over a wide range of Mach number and physical time scales.
Journal ArticleDOI
Validation of Computed High-Lift Flows with Significant Wind-Tunnel Effects
TL;DR: In this article, the modeling requirements for validating Navier-Stokes computations of a high-lift trapezoidal wing are investigated and a simplified, inviscid model of the test section performs as well as a highfidelity, viscous test-section model.
Journal ArticleDOI
Progress toward CFD for full flight envelope
TL;DR: In this article, the authors report the progress toward CFD for full flight envelope and describe the methods in use at Boeing to address high-lift, loads and stability and control concerns.
References
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Book
An Introduction to Multigrid Methods
TL;DR: These notes were written for an introductory course on the application of multigrid methods to elliptic and hyperbolic partial differential equations for engineers, physicists and applied mathematicians, restricting ourselves to finite volume and finite difference discretization.
Journal ArticleDOI
A diagonal form of an implicit approximate-factorization algorithm
Thomas H. Pulliam,D.S Chaussee +1 more
TL;DR: The modification transforms the coupled system of equations into an uncoupled diagonal form that requires less computational work and has an important effect on the application of implicit finite-difference schemes to vector processors.
Journal ArticleDOI
Preconditioned methods for solving the incompressible low speed compressible equations
TL;DR: It is sown that the resultant incompressible equations form a symmetric hyperbolic system and so are well posed, and several generalizations to the compressible equations are presented which extend previous results.
Proceedings ArticleDOI
A 3-D Chimera Grid Embedding Technique
TL;DR: A three-dimensional (3-D) chimera grid-embedding technique that simplifies the construction of computational grids about complex geometries by solution of the Euler equations for the transonic flow about a wing/body, wing/ body/tail, and a configuration of three ellipsoidal bodies is described.