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Monday, July 20, 2020 | History

3 edition of The three-dimensional flow past a rapidly rotating circular cylinder found in the catalog.

The three-dimensional flow past a rapidly rotating circular cylinder

# The three-dimensional flow past a rapidly rotating circular cylinder

Published by National Aeronautics and Space Administration, Langley Research Center, National Technical Information Service, distributor in Hampton, Va, [Springfield, Va .
Written in English

Subjects:
• Reynolds number.,
• Cylinders.

• Edition Notes

The Physical Object ID Numbers Other titles Three dimensional flow past a rapidly rotating circular cylinder. Statement James P. Denier, Peter W. Duck. Series ICASE report -- no. 93-52., NASA contractor report -- 191512., NASA contractor report -- NASA CR-191512. Contributions Duck, Peter W., Langley Research Center. Format Microform Pagination 1 v. Open Library OL14697292M

Purpose – The purpose of this paper is to study the unsteady boundary layer flow of a micropolar fluid past a circular cylinder which is started impulsively from rest. Design/methodology/approach – The nonlinear partial differential equations consisting of three independent variables are solved numerically using the 3D Keller‐box method. Findings – Numerical . On the influence of a wire placed upstream of a rotating cylinder: Three-dimensional effects, In Proceedings of the 19th Australasian Fluid Mechanics Conference (Eds: Harun Chowdhury and Firoz Alam, Pub: RMIT University, Melbourne, Australia, ISBN: ), RMIT University, Melbourne, Australia, December , (4 pages).

John Wilder Miles was born in Cincinnati, Ohio, on December 1, After graduating from high school in Oakland, CA, Miles entered Cal Tech and went on to receive a bachelor's degree in electrical engineering in , a master's degree in electrical and aeronautical engineering in , and a Ph.D. in electrical engineering in Moving Surface Boundary-layer Control (MSBC) was applied to several two dimensional bluff bodies using a high speed rotating cylinder as a momentum injecting device. Flow past a symmetric airfoil; a D-section; as well as square and rectangular prisms, representing a family of shapes with progressively increasing bluffness were studied in presence of the MSBC. In the case of the airfoil, the.

Finally, the translational and rotational motion of an elliptic cylinder around a fixed circular cylinder and its three-dimensional counterpart were studied. Acknowledgements The author was grateful to his former student, Dr. Ren Sun, for collaboration on the research of . In another example, Pralits et al. () studied the stability of the wake of a rotating cylinder, characterized by the suppression of the periodic shedding in a relatively narrow specific range of rotation rates, as long as the analysis is limited to two-dimensional flow. Structural-sensitivity analysis was instrumental in isolating this range.

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### The three-dimensional flow past a rapidly rotating circular cylinder Download PDF EPUB FB2

Three-dimensional computations are carried out for a spinning cylinder placed in a uniform flow. The non-dimensional rotation rate is varied in the range $\leqslant {\it\alpha}\leqslant$.A stabilized finite element method is utilized to solve the incompressible Navier–Stokes equations in primitive variables by: Get this from a library.

The three-dimensional flow past a rapidly rotating circular cylinder. [James P Denier; Peter W Duck; Langley Research Center.]. Navrose et al. [38] described several new instability modes for the case of a three-dimensional flow past a rotating circular cylinder.

In three-dimensional systems, the cylinder span becomes. Flow past a spinning circular cylinder placed in a uniform stream is investigated via three-dimensional computations.

A stabilized finite element method is utilized to solve the incompressible Navier-Stokes equations in the primitive variables formulation. The Reynolds number based on the cylinder diameter and freestream speed of the flow is Cited by: Three-dimensional instability of the ro ta ting cy linder ﬂo w 7 Further in vestigations are needed on the onset of a three-dimensional ﬂow past a rotating circular cylinder.

Ideal flow model of flow past a circular cylinder In AOE you studied irrotational incompressible flow past a circular cylinder without circulation (see Bertin,section ).

Such a flow can be generated by adding a uniform flow, in the positive x direction to a doublet at the origin directed in the negative x direction. A two-dimensional numerical study on the laminar flow past a circular cylinder rotating with a constant angular velocity was carried out.

The objectives were to obtain a consistent set of data for the drag and lift coefficients for a wide range of rotation rates not available in the literature and a deeper insight into the flow field and vortex development behind the cylinder.

Figure 13 Streamlines around a circular cylinder rotating in a uniform flow; Reynolds number 68 and V/U =where V is the circumferential velocity and U the velocity of undisturbed flow (aluminum flake method) Figure 14 Sheets of tracer particles separated from the surface of a rotating circular cylinder (electrolytic precipitation.

The mean flow around a truncated cylinder of aspect ratio 1 can be seen to be composed of three distinct flow features; that is the flow over the free end, the arch vor- tex and the horseshoe vortex, which interact strongly with each other, generating a fully three-dimensional flow.

This paper is a numerical study of the initial flow past a circular cylinder with combined streamwise and transverse oscillations. The motion is governed by the two-dimensional unsteady Navier–Stokes equations in non-primitive variables.

The method of solution is based on conjugating the perturbation theory with the collocation method. Depending upon the relative sizes of the parameters of the problem, rotating flow of a vertically confined fluid past an asymmetric object—in this case a circular cylinder with top sliced at an ang.

Extension of the familiar concept of boundary-layer separation to flow along moving walls and unsteady flows is a subject that attracted some interest in the ’s and has been investigated further in the past few years.

The well-known criterion of vanishing wall-shear does not apply in such flows, and therefore the definition of the phenomenon becomes more difficult than in the simpler. The flow over bluff bodies like spheres [24,25,26] and circular cylinders [27,28,29,30] is a classical problem in fluid et al.

[] focused on the influence of turbulence on the wind pressure and aerodynamic behavior of smooth circular and Duan [] studied numerically the flow past a yawed circular cylinder using large eddy simulation.

() The unsteady boundary layer flow past a circular cylinder in micropolar fluids. International Journal of Numerical Methods for Heat & Fluid Flow() Series solutions of unsteady boundary layer flow of a micropolar fluid near the forward stagnation point of a plane surface. Bell, J. R., Burton, D. & Thompson, M.

The boundary-layer characteristics and unsteady flow topology of full-scale operational inter-modal freight. Ninth International Conference on Numerical Methods in Fluid Dynamics Supersonic flow past circular cones at high angles of yaw, downstream of separation.

Pages Multigrid solution of the Navier-Stokes equations for the flow in a rapidly rotating cylinder. @article{osti_, title = {Simulations of the flow past a cylinder using an unsteady double wake model}, author = {Ramos-García, N.

and Sarlak, H. and Andersen, S. and Sørensen, J. N.}, abstractNote = {In the present work, the in-house UnSteady Double Wake Model (USDWM) is used to simulate flows past a cylinder at subcritical, supercritical, and transcritical Reynolds numbers.

Some Interesting Features of Flow Past Slotted Circular Cylinder at Re = (G K Suryanarayana, V Y Mudkavi, R Kurade, K M Naveen) A High-Resolution Compressible DNS Study of Flow Past a Low-Pressure Gas Turbine Blade (R Ranjan, S M Deshpande, R Narasimha).

Abstract. The purpose of this chapter is to survey classical and modern measurement techniques used in rotating flow experiments. Since the measurement of rotating flows is now a broad and rapidly developing art, it is clear that only a summary of the essential features of each measurement system can be given.

It is noted that the initial flow past an impulsively started rotating and translating circular cylinder had been discussed a long with a novel analysis by Badr and Dennis [6], Badr et al.

[5], and Coutanceau and Menard [19].The main purposes of this work are: (i) to generalize some theoretical results of Collins and Dennis [17] by. Eighteenth Symposium on Naval Hydrodynamics. Washington, DC: The National Academies Press. doi: / [27] and three-dimensional flow [28]. The latter reference includes the ef- fects of shear of a radially and circumfer- entially varying axial inflow to the actuator disk and incorporates some non-linear terms in the equations.Moreover, they calculated the fluid region and the rigid region around the cylinder—i.e., the corresponding yield surface.

In another work by Mitsoulis, the creeping flow of a Bingham fluid past a circular cylinder and the wall effects were investigated by FEM simulations. The blockage ratio varied between 2–50 in their study.Flow-visualization tests were conducted for right circular cylinders at Reynolds numbers from to 21, and for wavy cylinders at Reynolds numbers of 5, 10, These tests revealed new information concerning the secondary streamwise vortical structures (ribs) in the immediate wake of a right circular cylinder.