Last edited by Bragul
Friday, July 24, 2020 | History

2 edition of Smooth and roughened horizontal cylinders in periodic waves and current found in the catalog.

Smooth and roughened horizontal cylinders in periodic waves and current

Chung-chu Teng

Smooth and roughened horizontal cylinders in periodic waves and current

by Chung-chu Teng

  • 218 Want to read
  • 28 Currently reading

Published by Dept. of Civil Engineering, Ocean Engineering Program, Oregon State University in Corvallis, Ore .
Written in English

    Subjects:
  • Water waves -- Models.,
  • Cylinders -- Testing.

  • Edition Notes

    Statementby Chung-Chu Teng and John H. Nath.
    SeriesORESU-O -- 86-002.
    ContributionsNath, John H., Oregon State University. Ocean Engineering Program., Oregon State University. Sea Grant College Program.
    The Physical Object
    Pagination224 p. :
    Number of Pages224
    ID Numbers
    Open LibraryOL17641684M

      This report presents the results on an extensive experimental investigation of the in-line and transverse forces acting on smooth and rough circular cylinders placed in oscillatory water flow at Reynolds numbers up to ,, Keulegan-Carpenter numbers up to , and relative roughnesses from to Pages: A periodic array of parallel and infinitely long dielectric circular cylinders surrounded by air can be regarded as a simple two-dimensional periodic waveguide. For linear cylinders, guided modes exist continuously below the lightline in various frequency intervals, but standing waves, which are special guided modes with a zero Bloch wavenumber, could exist above the lightline at a discrete.

      When a binary mixture of two granules with different material properties is rotated in a horizontal rotating drum the granules often segregate. The smaller particles move towards the radial core within the first seconds. Depending on granular properties, drum speeds, and drum dimensions, axial segregation can follow. Wave force coefficient variability for cylinders, from wave to wave in a train of periodic waves, has been shown to be dependent on the phase of the force record relative to the ambient flow. The phase varies due to vortex shedding, but the maximum force is approximately constant as seen from this work and the work of other by: 6.

    The calibrated acoustic backscattering spectrum versus aspect angle, also called the “acoustic color” or “acoustic template,” of solid cylinders located near a flat interface was previously studied for the case where the cylinder axis was vertically oblique relative to the interface and was insonified by a beam at a non-zero grazing angle. The presence of the interface allows for Author: Daniel S. Plotnick, Philip L. Marston. This paper deals with wave characteristics of a cylinder with periodic ribs. The equation of motion of the stiffened cylinder is first derived using a receptance coupling method. The dispersion diagrams of the stiffened cylinder are then obtained in order to figure out the effects of the ribs on the wave : Byung-kyoo Jung, Chinsuk Hong, Jungsoo Ryue, Weui-bong Jeong, Ku-Kyun Shin.


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Smooth and roughened horizontal cylinders in periodic waves and current by Chung-chu Teng Download PDF EPUB FB2

This report presents the results of an extensive experimental investigation of the in-line and transverse forces acting on smooth and sand- roughened circular cylinders placed in oscillatory flow at Reynolds numbers up to 1, Keulegan-Carpenter numbers up toand relative sand.

Force records for the smooth m cylinder in irregular waves with a following current generated by a carriage speed of m/s: (a) horizontal forces; (b) vertical forces.

Large scale horizontal cylinder forces 0 F (N/m) T ^ Fig. Cited by: 9. A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text.

Ocean Engng. Vol. 7, pp. Pergamon Press Ltd. Printed in Great Britain WAVE FORCES ACTING ON A SUBMERGED HORIZONTAL CIRCULAR CYLINDER IN OBLIQUE WAVES AND ON A VERTICAL CYLINDER IN DEEP WAVES W.

KOTERAYAMA Research Institute for Applied Mechanics, Kyushu University, HakozakiFukuokaJapan Abstract--This paper presents a method of Cited by: 3. Rayleigh{Bloch surface waves along periodic gratings and their connection with trapped modes in waveguides By R. PORTERAND D.

EVANS School of Mathematics, University of Bristol, Bristol, BS8 1TW, UK (Received 22 July and in revised form 26 November ) Rayleigh{Bloch surface waves are acoustic or electromagnetic waves which propagate. This paper describes laboratory measurements of forces and pressures on smooth and rough horizontal cylinders of diameters m and m beneath waves of heights up to m, in the presence of currents up to Im/s in either direction.

Drag and inertia coefficients evaluated on a wave-by-wave basis exhibited very wide scatter, but average values over all Keulegan Carpenter numbers Cited by: 9.

Measurements of forces experienced by a submerged horizontal cylinder with its axis parallel to the crests in deep-water waves reveal nonlinear components with frequencies up to three times the fundamental wave by:   The horizontal force is not evenly distributed in the lower fluid.

And the force at different depths increases along with wave height. Internal solitary wave can produce an impact load on the entire pile. The horizontal force of internal periodic waves on the vertical cylinders is periodically changed at the frequency of by: 3.

$\begingroup$ We are assuming that equilibrium is broken by the upper cylinder slipping down against both lower cylinders at the same time. And this would mean that the reactions between the upper and lower cylinders are the same on both sides.

If the weights of the lower cylinders were not equal, then this would not necessarily be the case, as one side could be in limiting equilibrium and the. An analysis is made of the generation of surface waves by the time-periodic oscillations of smooth submerged cylinders in the limit when the cylinder is at a large depth h below the free surface, and the frequency ω/(2π) of the oscillations is high.

Specifically, the parameters of the problem are such that ω2 d 2/g ≫ 1 and h/d 1 ≫ 1 subject to the condition that ω2 d 1 d 2/(gh) ≪ 1 Author: A. Ayad. KHALIL: WAVE FORCES ON SUBMERGED HORIZONTAL CYLINDERS 61 Fi g.

I- Arrangement of the cylindrical modcl in thc channel through a strut and a box of gauge system (a multi­ component load cell) for the measurement of forces. Each model is tested at eight different depths of submergence viz., DIS =,The current paper reports on an attempt for better understanding the marine fouling effects on the VIV of circular cylinders.

Heavily roughened horizontal cylinders in waves. in relatively. Measurements of forces experienced by a submerged horizontal cylinder with its axis parallel to the crests in deep-water waves reveal nonlinear components with frequencies up to three times the fundamental wave frequency.

The dominant nonlinear contribution to the loading is a t the third order in the wave amplitude, and, for Keulegan4arpenter numbers approaching 2, its magnitude was found to Cited by: 5 The cylinders of the grating are placed perpendicularly to the x-y plane, and separated by a distance of “d ”, as indicated in figure 1.

In the above description of the incident field, vˆi denotes the vertical polarization vector associated with a unit vector having a component parallel to all the cylinders, i is the angle of incidence in x-y plane measured from x axis in such a way Author: Omer Kavaklioglu, Baruch Schneider.

C) period D) A) frequency wavelength E) tension B) amplitude 5. A student wants to demonstrate a longitudinal wave. He holds a long spring with his fingertips and lets it hand vertically over the edge of a railing, as shown.

The student can move his hand in a way that creates waves that propagate down the. is the horizontal spatial variation of the n th component wave potential) n.

Very near the cylinders the waves may exhibit three-dimensional features. However, in the region far from the cylinders, the waves may become long-crested.

Therefore, the solutions for I n (x) in each region of the fluid domain sketched in Fig. 1 may be constructed as.

Two bodies P and Q on a smooth horizontal surface are connected by a light cord. The mass of P is greater than that of Q. A horizontal force F (of magnitude F) is applied to Q as shown in the figure, accelerating the bodies to the right. The results of an experimental investigation on the generation of transverse surface waves inside an array of randomly placed circular glass cylinders are presented.

The transverse waves are generated from the forces developed by periodic vortex shedding from the glass cylinders. THE LOADING ON A CYLINDER IN POST-CRITICAL FLOW BENEATH PERIODIC AND RANDOM WAVES. A major problem encountered in model testing of offshore structures in wave tanks is the difficulty of extrapolating fluid loading on tubular members to full scale conditions.

The results of an experimental investigation carried out to measure combined wave and current loads on horizontally submerged square and rectangular cylinders are reported in this paper.

The wave and current induced forces on a section of the cylinders with breadth-depth (aspect) ratios equal to 1,and are measured in a wave tank.

The maximum value of Keulegan-Carpenter (KC) number Cited by: 8. Oscillation of a cylinder on a cylindrical surface. Add Remove. This content was COPIED from - View the original, and get the already-completed solution here!

A small uniform cylinder of radius R rolls without slipping along the inside of a large fixed cylinder of radius r (r>R). Hi. All technical implementations of the Magnus effect I can find on Google (such as ships) seem to use fairly smooth cylinders.

Why? Shouldn't the efficiency increase with increasing friction between cylinder and fluid, for example with a rough surface or even attaching blades?However, very little research has been done on vortex-induced vibration in combined current and surface wave flows which are conditions more like the real ocean environment.

Very little experimental data is reported in open literature for combined wave and current environments, and most of that data has been obtained at very small model scales.