3 edition of Direct numerical simulation of instabilities in parallel flow with spherical roughness elements found in the catalog.
Direct numerical simulation of instabilities in parallel flow with spherical roughness elements
by National Aeronautics and Space Administration, US Army Aviation Systems Command, For sale by the National Technical information Service in [Washington, DC, St. Louis, Mo.], [Springfield, Va
Written in English
|Statement||R. G. DeAnna.|
|Series||AVSCOM technical report -- 92-C-023., NASA technical memorandum -- 105847., AVSCOM technical report -- 92-C-023., NASA technical memorandum -- 105847.|
|Contributions||United States. Army Aviation Systems Command., United States. National Aeronautics and Space Administration.|
|The Physical Object|
Lardeau S, Zaki TA (). Assessment of Large-Eddy Simulation for accurate prediction of transitional flow in a compressor cascade. 15th International Conference on Finite Elements in Flow Problems. Wissink JG, Zaki TA, Durbin PA, Rodi W (). Direct Numerical Simulations of Flow in a Low-Pressure Compressor Cascade with Incoming Wakes Direct numerical simulations are performed where the temperature variable is treated as a passive scalar. The laminar flow is perturbed with wall-roughness elements that are able to produce centrifugal instabilities in the form of Görtler vortices with a maximum growth ://
Specifically, we present a direct numerical simulation (DNS) of a two-dimensional boundary-layer flow over a flat plate encountering a three-dimensional Gaussian-shaped hump. This work was motivated by the lack of DNS data of boundary-layer flows past roughness elements in a Direct numerical simulation of breakdown to turbulence in a Mach 6 boundary layer over a porous surface. Physics of Fluids, 22, [15pp]. DOI: /; Redford, J. A., Sandham, N. D., & Roberts, G. T. (). Direct numerical simulation of transitional flow at high Mach number coupled with a wall heating ://
These instabilities might lead ultimately to unstable combustion, flashback, blow-off, and noise. Example of thermo-diffusive instabilities. Experimental picture of a spherical flame in a bomb chamber (left). Detailed numerical simulation of the initial growth of the thermo-diffusive instabilities (right). Faculty: Guillaume Numerical Solution of the Shallow Water Equations with a MacCormack Type Finite Difference Scheme Development and Verification of the Eddy Diffusion Thermal Stratification Model, 'U.S.E.D.' Mathematical Modelling and Simulation of the Passaic River Basin in New Jersey Biomedical Models Massively Parallel Computational Models of Biological Systems
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Abstract. Results from a direct numerical simulation of laminar flow over a flat surface with spherical roughness elements using a spectral-element method are given. The numerical simulation approximates roughness as a cellular pattern of identical spheres protruding from a smooth :// Results from a direct numerical simulation of laminar flow over a flat surface with spherical roughness elements using a spectral-element method are given.
The numerical simulation approximates roughness as a cellular pattern of identical spheres protruding from a smooth wall. Periodic boundary conditions on the domain's horizontal faces simulate an infinite array of roughness elements D/abstract.
Direct Numerical Simulation of Instabilities in Parallel Flow With Spherical Roughness Elements DTIC S ELECTE S i• JAN 12 C R.G. De Anna Propulsion Directorate U.S. Army Aviation Systems Command Lewis Research Center Cleveland, Ohio AppToved ' 0i p~jac [email protected] August INI 1IE EII I IARMYND NJASA AVIATION(I SYSTEMS COMMAND Get this from a library.
Direct numerical simulation of instabilities in parallel flow with spherical roughness elements. [Russell G DeAnna; United States. Army Aviation Systems Command.; United States. National Aeronautics and Space Administration.] The numerical simulation approximates roughness as a cellular pattern of identical spheres protruding from a smooth wall.
Periodic boundary conditions on the domain's horizontal faces simulate an infinite array of roughness elements extending in the streamwise and spanwise directions, which implies the parallel-flow assumption, and results in a Direct Numerical Simulation of Instabilities in Parallel Flow With Spherical Roughness Elements R.G.
De Anna Propulsion Directorate U.S. Army Aviation Systems Command Lewis Research Center Cleveland, Ohio DTI j!t& i3 August Z CD US ARMY (O'11 WAVIATIOI SYSTEMS COMMAND 9., 1.
'.4 Direct Numerical Simulation of Instabilities in Parallel Flow with Spherical Roughness Elements Effect of a single roughness element on boundary layer transition over a wedge Experimental Thermal and Fluid Science, Vol.
4, No. 5 A direct numerical simulation investigation of a transient flow in a channel with a smooth top wall and a roughened bottom wall made of close-packed pyramids is :// The direct numerical simulation of turbulence (DNS) has become a method of outmost importance for the investigation of turbulence physics, and its relevance is constantly growing due to the increasing popularity of high-performance-computing :// () Direct Numerical Simulation of turbulent flow in pipes with an arbitrary roughness topography using a combined momentum–mass source immersed boundary method.
Computers & Fluids() Accuracy of three-dimensional analysis of regularized :// direct numerical simulations. International journal of multiphaseflow, page (In review), a. Khan and C.K.
Aidun. Direct numerical simulation of saturated deformable porous media using a parallel hybrid lattice-boltzmann finite element method. Inter-national journal of numerical methods in Engineering, page (In review), Direct numerical simulation (DNS) for the flow separation and transition around a NACA airfoil with an attack angle of 4 o and Reynolds number ofis conducted and analyzed in this chapter.
The details of the flow separation, formation of the detached shear layer, Kelvin- Helmoholtz instability (inviscid shear layer instability) and The applied methodology is a combination of the direct numerical simulation of turbulent flow, the combined finite-discrete element modeling of particle motion and collision and the immersed Cuenot, B., Egolfopoulos F.
and Poinsot, T. () Direct Numerical simulation of stagnation flow premixed flames: transition form planar to Bunsen flames and the direct measurement of laminar flame speeds. 2nd Joint meeting of the US sections of the Combustion Institute, Paper ~poinsot.
1. Introduction. Gas/liquid multiphase flows occur in a wide range of natural and man-made situations. Examples include boiling heat transfer, cloud cavitation, bubble columns and reactors in the chemical industry, cooling circuits of power plants, spraying of liquid fuel and paint, emulsions, rain, bubbles and drops due to wave breaking in the oceans, and explosive volcanic :// This book contains contributions by colleagues, former students and friends of Professor Eli Reshotko in celebration of his 60th birth day.
Since Professor Reshotko's scientific and engineering contribu tions have been in the areas of hydrodynamic stability, transition to turbulence, and boundary layer flows, it is only appropriate that the articles in this volume be devoted to these and Direct numerical simulation of high-speed transition due to an isolated roughness element - Volume - Pramod K.
Subbareddy, Matthew D. Bartkowicz, Graham V. Candler M. Greiner, G. Spencer, and P. Fischer, "Direct numerical simulation of three-dimensional flow and augmented heat transfer in a grooved channel" ASME J.
of Heat Transfer 3 pp. Gottlieb and P. Fischer, "A modified conjugate gradient method for ~fischer/pubhtml. An Asymptotic-Numerical Method for the Orr-Sommerfeld Equation / Raymond C.
Chin. Direct Numerical Simulation of Instabilities in Parallel Flow with Spherical Roughness Elements / R. De Anna. A Study of Active Dither Control of Aerodynamic Instabilities in Axial-Compressors / W. Hosny, L. Leventhal and W. :// Direct Numerical Simulation of Flow Modified by Wall Transpiration by and n.
Proceedings of the CSME ForumJune, The University of Western Ontario, London, Ontario, pp Thermocapillary Convection in Cavities with Fixed Mass Configurations by -Gammal and ://. The method developed in this paper is motivated by Peskin's immersed boundary (IB) method, and allows one to model the motion of flexible membranes or other structures immersed in viscous incompressible fluid using a fluid solver on a fixed Cartesian grid.
The IB method uses a set of discrete delta functions to spread the entire singular force exerted by the immersed boundary to the The ninth Workshop on 'Direct and Large-Eddy Simulation' (DLES-9) was held in Dresden, April, organized by the Institute of Fluid Mechanics at Technische Universität Dresden.
This book is of interest to scientists and engineers, both at an early level in their career and at more senior › Engineering › Mechanics.Direct numerical simulation of boundary-layer flow over surface roughness Miscellaneous De Anna, R G Results from a direct numerical simulation of transitional flow over a surface with spherical roughness elements of height k and a surface with random roughness of maximum height