Proceedings ArticleDOI
Recent enhancements to OVERFLOW
TLDR
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
Laminar Heating Validation of the OVERFLOW Code
TL;DR: In this paper, a structured finite difference code (overflow) was applied to the solution of hypersonic laminar flow over several configurations assuming perfect gas chemistry, including flat plate at 0 degrees incidence, a sphere, a compression ramp, and the X-38 re-entry vehicle.
Proceedings Article
Influence of Spanwise Boundary Conditions on Slat Noise Simulations
TL;DR: In this paper, two different spanwise grids are used to investigate the effect of the spanwise extent and periodicity on the near-field unsteady structures and radiated noise.
Proceedings ArticleDOI
Validation of High-Speed Turbulent Boundary Layer and Shock-Boundary Layer Interaction Computations with the OVERFLOW Code
TL;DR: The capability of the OVERFLOW code to accurately compute high-speed turbulent boundary layers and turbulent shock-boundary layer interactions is evaluated in this article, where the authors present preliminary results for two of the flat plate cases and two small-angle compression corner test cases.
Patent
Predicting transition from laminar to turbulent flow over a surface
Dev Rajnarayan,Peter Sturdza +1 more
TL;DR: In this paper, a transition prediction technique is used to predict whether a point on a computer generated surface is adjacent to laminar or turbulent flow, and a plurality of instability modes are obtained, each defined by one or more mode parameters.
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.