Download or read book Viscous Effects in Transonic Flow Past Airfoils written by Jerzy J. Kacprzynski and published by . This book was released on 1974 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Calculation of Viscous Effects on Transonic Flow for Oscillating Airfoils and Comparisons with Experiment written by James T. Howlett and published by . This book was released on 1987 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Viscous Effect on Airfoils for Unsteady Transonic Flows written by and published by . This book was released on 1982 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book On Viscous and Wind Tunnel Wall Effects in Transonic Flows Over Airfoils written by Robert E. Melnik and published by . This book was released on 1973 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt: An extensive correlation between wind-tunnel data and finite-difference solutions of the exact potential-flow equation was performed. Two procedures are compared, one using the Kutta condition and the other using the experimental lift coefficient to determine the circulation. The numerical calculations are used to extract viscous and wall interference effects from the data. The correlation results indicate that viscous effects on lift are greater than 30%, even for turbulent boundary layers and Reynolds numbers greater than 2 x 10 to the seventh power. It is shown that viscous effects can be almost completely accounted for in numerical calculations by adjusting the circulation to match the experimental lift. (Author).

Download or read book An Improved Viscid inviscid Interaction Procedure for Transonic Flow Over Airfoils written by R. E. Melnik and published by . This book was released on 1985 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book An Improved Viscid inviscid Interaction Procedure for Transonic Flow Over Airfoils written by and published by . This book was released on 1985 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Experimental Studies of Scale Effects on Oscillating Airfoils at Transonic Speeds written by and published by . This book was released on 1980 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Steady Inviscid Transonic Flows Over Planar Airfoils written by R. Magnus and published by . This book was released on 1973 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt: A finite difference procedure based upon a system of unsteady equations in proper conservation form with either exact or small disturbance steady terms is used to calculate the steady flows over several classes of airfoils. The airfoil condition is fulfilled on a slab whose upstream extremity is a semi-circle overlaying the airfoil leading edge circle. The limitations of the small disturbance equations are demonstrated in an extreme example of a blunt-nosed, aft-cambered airfoil. The necessity of using the equations in proper conservation form to capture the shock properly is stressed. Ability of the steady relaxation procedures to capture the shock is briefly examined.

Download or read book An Improved Viscid written by R. E. Melnik and published by . This book was released on 1985 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Calculation of Viscous Effects on Transonic Flow for Oscillating Airfoils and Comparisons with Experiment written by James T. Howlett and published by . This book was released on 1987 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Calculation of Viscous Transonic Flows about a Supercritical Airfoil written by Miguel R. Visbal and published by . This book was released on 1986 with total page 94 pages. Available in PDF, EPUB and Kindle. Book excerpt: A critical examination of several aspects of the numerical simulation of high Reynolds number transonic airfoil flows is presented. Subcritical and supercritical flow fields about an aft-cambered airfoil were generated by solving the mass-averaged Navier-Stokes equations with turbulence incorporated through an algebraic eddy viscosity model. The governing equations were solved on curvilinear body-fitted grids utilizing two different algorithms., i.e., MacCormack's explicit and Beam-Warming implicit. The numerical uncertainties associated with different schemes, grid resolution, artificial viscosity and far field boundary placement were investigated and found to be of the same order of magnitude or less than the corresponding uncertainties in the available experimentat data. Comparison of computed and experimental results showed good prediction of all the essential flow features. However, detailed comparison of velocity profiles pointed out deficiencies of the turbulence model downstream of the shock/boundary layer interaction in the airfoil cove and in the near-wake. Thin-layer and Navier-Stokes computed results were found in excellent agreement with each other. However, the Euler equations failed to provide a reasonable approximation of the flow due to the dramatic viscous-inviscid interaction effects for supercritical airfoils. Keywords: Computational fluid dynamics, MacCormack's explicit algorithm, Transonic flow, and Numerical methods and procedures.

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1994 with total page 956 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Unsteady Transonic Aerodynamic and Aeroelastic Calculations about Airfoils and Wings written by and published by . This book was released on 1984 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book An Analysis of Transonic Jet Flapped Airfoils with the Inclusion of Viscous Effects written by S. Elzweig and published by . This book was released on 1976 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt: The inviscid and viscous effects associated with a jet-flapped airfoil in the transonic regime are investigated. Integral methods are used for the description of the viscous portions of the flow and a relaxation method is used for the inviscid portions. The viscous-inviscid coupling is delineated. Their coupling procedures along the wing and the jet acknowledge the importance and magnitude of the viscous effects on pressure distribution and directly incorporate the displacement effect on the wing and the effects of jet mixing into the boundary conditions for the computation of the entire flow. Preliminary numerical results are presented to validate the solution. A computer program for a systematic exploitation of the complete analysis is discussed.

Download or read book Reynolds Number Effects in Transonic Flow written by A. Elsenaar and published by . This book was released on 1988 with total page 82 pages. Available in PDF, EPUB and Kindle. Book excerpt: Reynolds number effects in transonic flow are critically reviewed. This review, which may be considered a supplement to AR 224 'Boundary Layer Simulation and Control in Wind Tunnels', is mainly concered with a discussion of viscous effects actually observed on realistic configurations. The following geometries are considered: Airfoils and high aspect ratio wings typical and transport aircraft, fighter-type low aspect ratio delta wings, tow- and three-dimensional bodies characteristic of missiles and combat aircraft fuselages, and afterbodies. "Pseudo"--Reynolds number on the wind tunnel environment and in turn affect the flow about a model. As an introduction, a brief retrospect of the "history" of Reynolds number effect is presented. This AGARDograph has been produced at the request of the Fluid Dynamics Panel of AGARD.

Download or read book Transonic Shock and Multidimensional Flows written by Richard E. Meyer and published by Academic Press. This book was released on 2014-05-10 with total page 356 pages. Available in PDF, EPUB and Kindle. Book excerpt: Mathematics Research Center Symposium: Transonic, Shock, and Multidimensional Flows: Advances in Scientific Computing covers the lectures presented at a Symposium on Transonic, Shock, and Multidimensional Flows, held in Madison on May 13-15, 1981, under the auspices of the Mathematics Research Center of the University of Wisconsin. The book focuses on the advancements in the scientific computation of high-speed aerodynamic phenomena and related fluid motions. The selection first elaborates on computational fluid dynamics of airfoils and wings; shock-free configurations in two- and three-dimensional transonic flow; and steady-state solution of the Euler equations for transonic flow. Discussions focus on boundary conditions, convergence acceleration, indirect design of airfoils, and trailing edge and the boundary layer. The text then examines the calculation of transonic potential flow past three-dimensional configurations and remarks on the numerical solution of Tricomi-type equations. The manuscript ponders on the design and numerical analysis of vortex methods, shock calculations and the numerical solution of singular perturbation problems, tracking of interfaces for fluid flow, and transonic flows with viscous effects. Topics include numerical algorithm, difference approximation for scalar equations, boundary conditions, transonic flow in a tube, and governing equations. The selection is a dependable reference for researchers interested in transonic, shock, and multidimensional flows.

Download or read book A Study of the Asymmetric Transonic Flow Past a Sharp Leading Edge written by Howard A. Stine and published by . This book was released on 1960 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt: The theoretical portion of the study consists of the calculation by relaxation methods of an unbounded, inviscid, two-dimensional flow about a portion of the same body at a free-stream Mach number of exactly unity. The calculations yield a separation bubble on the upper surface which has a shape shown to be compatible with known theoretical conditions for viscous attachment to the upper surface of the body. Agreement between theoretically calculated and the experimentally determined features of the flow was good in regions where the local Mach number was 2 or less. In regions of higher local Mach number the agreement was fair.