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| Author | : |
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| Total Pages | : 218 |
| Release | : 1987 |
| Genre | : Aerodynamics |
| ISBN | : 9789283504078 |
| Author | : North Atlantic Treaty Organization. Advisory Group for Aeronautical Research and Development |
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| Release | : 1986 |
| Genre | : Ayırma (Teknoloji) |
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| Author | : NATO. ADVISORY GROUP FOR AEROSPACE RESEARCH AND DEVELOPMENT. |
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| Total Pages | : 100 |
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| Author | : V. C. Patel |
| Publisher | : |
| Total Pages | : 32 |
| Release | : 1982 |
| Genre | : Turbulent boundary layer |
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Three-dimensional thin boundary-layer equations for laminar and turbulent flows are solved by two different numerical schemes. The methods are applied to the flow over bodies of revolution at incidence and the results are compared with the available experimental data in order to study the range of validity of the classical boundary-layer approximations in regions of increasing circumferential gradients and flow reversal associated with the early stages of a free-vortex type of separation. Comparison with the DFVLR 6:1 spheroid data of Meier et al and the 4:1 combination-body data of Ramaprian, Patel and Choi indicate that the methods perform well in regions where the boundary layer remains thin but the predictions deteriorate as the boundary layer thickens. The results point out the need for the development of methods of handle thick boundary layers and viscous-inviscid interactions. (Author).
| Author | : National Aeronautics and Space Administration (NASA) |
| Publisher | : Createspace Independent Publishing Platform |
| Total Pages | : 32 |
| Release | : 2018-08-14 |
| Genre | : |
| ISBN | : 9781725571891 |
Incompressible three dimensional, turbulent boundary layer (3DTBL) experiments were simulated numerically by integrating the boundary layer equations together with an algebraic eddy viscosity turbulence model. For the flow treated, the downstream portion, where the crossflow was large, was not predicted with the present computational method; the flow was significantly influenced by elliptic flow field effects. Departures from the boundary layer concept are indicated. Calculations agreed reasonably well with the mean flow development up to separation. In one experiment the normal pressure gradients were found to be neligible in regions with large skewing and allowed testing turbulence models using the boundary layer equations. The simulation of this flow compared favorably with the experimental data throughout the flow field and suggested the applicability of algebraic eddy viscosity models for 3DTBLs. Mueller, U. R. Ames Research Center NASA-TM-84230, A-8873, NAS 1.15:84230 ...
| Author | : Michel Deville |
| Publisher | : Springer Science & Business Media |
| Total Pages | : 406 |
| Release | : 2013-04-17 |
| Genre | : Technology & Engineering |
| ISBN | : 3322898385 |
Der Sammelband enthält Beiträge einer Tagung über die Simulation von dreidimensionalen Flüssigkeiten. Sie geben einen Überblick über den Stand des Wissens auf dem Gebiet der numerischen Simulation der Turbulenz, angewandt auf eine weite Spanne von Problemen wie Aerodynamik, Nicht-Newtonsche Flüssigkeiten, Konvektion.This volume contains the material presented at the IMACS-COST Conference on CFD, Three-Dimensional Complex Flows, held in Lausanne (Switzerland), September 13 - 15, 1995. It gives an overview of the current state of numerical simulation and turbulence modelling applied to a wide range of fluid flow problems such as an example aerodynamics, non-Newtonian flows, transition, thermal convection.
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| Total Pages | : 26 |
| Release | : 1989 |
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| Total Pages | : 32 |
| Release | : 1982 |
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| Total Pages | : 22 |
| Release | : 1985 |
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| Author | : V. C. Patel |
| Publisher | : |
| Total Pages | : 13 |
| Release | : 1982 |
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Three-dimensional boundary layers on a 6:1 spheroid at an incidence of 10 degrees have been calculated at two Reynolds numbers and comparisons have been made with the corresponding data of Meier et al. The results clearly demonstrate the capabilities and limitations of first-order boundary-layer theory. At the lower Reynolds number, the laminar boundary-layer calculations are in good agreement with the data on the the windward side of the body and separation is predicted in the region where the experiments indicated near zero wall shear stress just before transition to turbulent flow. The solutions have been interpreted in the light of previous proposals concerning the topology of three-dimensional flow separation. Although the results support several alternative possibilities, it is concluded that boundary-layer calculations, by themselves, are insufficient to identify a clear choice.
