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Wednesday, October 14, 2020 | History

4 edition of The effects of curvature on the turbulent boundarylayer found in the catalog.

The effects of curvature on the turbulent boundarylayer

Virendrakumar Chaturbhai Patel

The effects of curvature on the turbulent boundarylayer

by Virendrakumar Chaturbhai Patel

  • 102 Want to read
  • 12 Currently reading

Published by H.M.S.O in London .
Written in English

    Subjects:
  • Boundary layer.,
  • Turbulence.

  • Edition Notes

    Statementby V. C. Patel.
    SeriesReports and memoranda / Aeronautical Research Council -- no.3599, Reports and memoranda (Aeronautical Research Council) -- no.3599.
    The Physical Object
    Pagination(1),31p. :
    Number of Pages31
    ID Numbers
    Open LibraryOL21103369M
    ISBN 100114702004
    OCLC/WorldCa811686

    Harris J.E., Morris D.J. () Solution of the three-dimensional compressible, laminar, and turbulent boundary-layer equations with comparisons to experimental data. In: Richtmyer R.D. (eds) Proceedings of the Fourth International Conference on Numerical Methods in Fluid Dynamics. Lecture Notes in Physics, vol Springer, Berlin, Heidelberg   By employing particle image velocimetry, the response of a Mach turbulent boundary layer to the concave curvature is experimentally investigated. The radius of the concave wall is mm, and the turning angle is 20 ∘.Logarithmic law is well preserved in the profile of streamwise velocity at all streamwise positions despite the impact of ://

    Predictions of the surface drag in turbulent boundary-layer flow over two-dimensional sinusoidal topography from various numerical models are compared. For simple 2D terrain, the model results show that the drag increases associated with topography are essentially proportional to (slope)2 up to the steepness at which the flow separates. For the purposes of boundary-layer parameterisation   By employing the particle image velocimetry, the mean and turbulent characteristics of a Mach turbulent boundary layer are experimentally investigated without the impact of curvature. The physical mechanism with which the streamwise adverse pressure gradient affects the supersonic boundary layer is revealed. The data are compared to that of the concave boundary layer with similar

    A new instability of the centrifugal type due to the curvature of external streamlines was theoretically predicted in a recent study on boundary layers along a swept wing. It is, however, not clear how this instability relates to already-known instability phenomena in various three-dimensional ://   J. C. Gillis and J. P. Johnston, Turbulent boundary layer flow and structure on a convex wall and its redevelopment on a flat wall, J. Fluid M e c h., () V. Baskaran, A. J. Smits and P. N. Joubert, A turbulent flow over a curved hill, part 2: effects of streamUne curvature and streamwise pressure gradient, ://


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The effects of curvature on the turbulent boundarylayer by Virendrakumar Chaturbhai Patel Download PDF EPUB FB2

Summary. This paper reports the results of flow visualization studies on the structure of turbulent boundary layers over concave walls. A flat plate turbulent boundary layer was grown on one wall of a straight, large water channel and then passed over a concave ://   American Institute of Aeronautics and Astronautics Sunrise Valley Drive, Suite Reston, VA   The Effects of Concave Curvature on Turbulent Boundary Layer Structure.

Structure and Mean Flow Similarity in Curved Turbulent Boundary Layers. Turbulence measurements in a developing mixing layer with mild destabilising curvature. Experiments in Fluids, Vol. 1, No. ://   Analysis of Streamline Curvature Effects on Wall-Bounded Turbulent Flows_交通运输_工程科技_专业资料 that the effects of curvature on turbulence intensity and structure must be predicted accurately to capture the boundarylayer development over To  › 百度文库 › 专业资料 › 工程科技 › 交通运输.

The influence of turbulence absorption is shown to be negligible, whereas the effects of finite boundary-layer size and wall curvature are found to be of comparable magnitudes, and are presumably the principal factors governing the height of the spectral peak for boundary layers formed on a rigid :// Concave curvature has a relatively large, unpredictable effect on turbulent boundary layers.

Some, but not all previous studies suggest that a large-scale, stationary array of counter-rotating vortices exists within the turbulent boundary layer on a concave ://   Book Search tips Selecting this option will search all publications across the Scitation platform Selecting this option will search all publications for the Publisher/Society in context.

Wang, “The effects of curvature on turbulent mixing layers,” Ph.D. Investigation of Negative Surface Curvature Effects in Axisymmetric Shock/Boundary-Layer Interaction. along which a turbulent boundary layer developed. Complementary experimental and computational investigations of the resulting SBLI are performed for ramp angles of 16, 20, and 24 deg at a nominal freestream Mach number of   The effect of three-dimensional (3-D) relief from surface curvature on a shock/boundary-layer interaction (SBLI) is investigated by mounting a sharp fin on a cylindrical surface.

The test article consisted of a fin with a 5 deg half-angle affixed to a half-cylinder with a 50 mm outer diameter placed in a Mach :// Experimental data indicating some effects of free-stream turbulence intensity on time-average boundary-layer velocity profiles and on heat transfer from a constant-temperature flat plate with a favorable pressure gradient are presented for local Reynolds numbers ranging from 4 × 10 4 to 4 × 10 5 and for free-stream turbulence intensities from to :// An experimental investigation has been carried out on a transitional boundary layer subject to high (initially 9%) freestream turbulence, strong acceleration (K = ν / U w 2 dU w / dx as high as 9 × 10 − 6), and strong concave curvature (boundary layer thickness between 2% and 5% of the wall radius of curvature).

Mean and fluctuating velocity as well as turbulent shear stress are documented /Effects-of-Concave-Curvature-on-Boundary-Layer. Effects of streamline curvature on turbulent flow. [Neuilly-sur-Seine, France] North Atlantic Treaty Organization, Advisory Group for Aerospace Research and Development.

[] (OCoLC) Document Type: Book: All Authors / Contributors: A D Young; Bradshaw, Peter.; North Atlantic Treaty Organization. Advisory Group for Aerospace Research This approach fully incorporates effects of streamline divergence and surface curvature.

Also, it provides global information regarding general 2D and 3D perturbations. By applying the e N method, the value N=10 is found to correlate well with most of the experimental transition data.

The effects of leading-edge curvature and non-uniform   Curvature effects on the stability of three-dimensional laminar boundary layers Thesis/Dissertation Collier, Jr, F S The linear-stability equations that govern the growth of small periodic disturbances for compressible, three-dimensional laminar boundary layer flow are derived in an orthogonal curvilinear coordinate :// More recent work focused, e.g., on the effects of laminar-turbulent transition on shock-wave/boundary-layer interaction [86], transitional shock-wave/boundary-layer interactions in hypersonic flow Mean-velocity measurements were made in the boundary layer on a smooth circular cylinder fitted with trip wires to model supercritical flow.

The data are compared with the predictions of a boundary-layer calculation method to study the relative influence of surface curvature and low-Reynolds-number effects, and to assess the accuracy with which the location of separation can be :// CONVEXCURVATUREEFFECT al.

[a, b] and Gillis et al. [, ]. These experiments provided the beginning of a data base for recovery from curvature effects by introducing a fiat Streamline curvature in the plane of the mean flow is known to exert a proportionately greater effect on the turbulent mixing processes than might be expected from inspection of the conservation equations governing the evolution of the turbulence :// Turbulent boundary-layer flow and structure on a convex wall and its redeveloment on a flat wall.

By J. Johnston and J. Gillis. Abstract. Although the number of data sets which show the effects of convex curvature on turbulence has increased in the last 10 years, the development of really good calculational models is being held back by a   As shown in Figure 1, an experimental setup consisting of a blowing wind tunnel with a ( × mm) working section was used to study the effects of convex surface curvature on velocities could be obtained in the range of m/s, and three turbulence grids of different sizes and a fine screen were used to generate different free-stream turbulence ://.

The effects of Lewis number on the physical mechanisms pertinent to the curvature evolution have been investigated using three-dimensional Direct Numerical Simulation (DNS) of spherically expanding turbulent premixed flames with characteristic Lewis number of L e =and It has been found that the overall burning rate and the extent of flame wrinkling increase with decreasing The turbulent Prandtl number Pr 1, which was assumed to be independent of the wall curvature, as well as e: 0, were calculated from the Cebed-Bradshaw models [2].

low-curvature streamlined surfaces are discussed, while later sections deal with surface-pressure fluctuations, wall-curvature effects, flows separating from sharp-edged bluff bodies, and unsteady effects. 2. STEADY FREE-STREAM SEPARATING TURBULENT BOUNDARY LAYERS For low-curvature and flat surfaces, the mean flow upstream of ID obeys