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Keywords: downstream cylinder
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Proceedings Papers

Paper presented at the The 30th International Ocean and Polar Engineering Conference, October 11–16, 2020
Paper Number: ISOPE-I-20-3231
... twin cylinder horizontal displacement drag force drag coefficient up-and downstream cylinder displacement cylinder downstream cylinder current direction sft pontoon dynamic response current load lift coefficient mean drag coefficient Numerical Study on the Dynamic Response...
Proceedings Papers

Paper presented at the The 29th International Ocean and Polar Engineering Conference, June 16–21, 2019
Paper Number: ISOPE-I-19-661
... in the test. For the "from rest" case, the downstream cylinder exhibits three regimes of vibration responses: pure VIV, separated VIV and separated WIV, and combined VIV and WIV; For the "increasing velocity" case, it exhibits two regimes: separated VIV and separated WIV, and combined VIV and WIV. When...
Proceedings Papers

Paper presented at the The 26th International Ocean and Polar Engineering Conference, June 26–July 2, 2016
Paper Number: ISOPE-I-16-316
... the physics of the flow in the spacing region. Surface streamlines are used to visualize the flow separation on both cylinders and the impingement location on the downstream cylinder. This representation has, to the knowledge of these authors, not been published before. The results of the drag and lift...
Proceedings Papers

Paper presented at the The Twenty-fifth International Ocean and Polar Engineering Conference, June 21–26, 2015
Paper Number: ISOPE-I-15-702
... common operating conditions in offshore installations. Responses of the downstream cylinder in the wake of upstream cylinder were shown to be driven by interactions of wake flows with its own wake; thus it is essentially important to capture wake structures to be able to predict well the behavior...
Proceedings Papers

Paper presented at the The Twenty-fifth International Ocean and Polar Engineering Conference, June 21–26, 2015
Paper Number: ISOPE-I-15-136
... cylinder near a plane wall. vicinity reynolds number pitch ratio upstream oil & gas vortice simulation production control tandem cylinder zdravkovich tandem cylinder close downstream cylinder circular cylinder coefficient abrahamsen prsic cylinder upstream cylinder vortex...
Proceedings Papers

Paper presented at the The Twenty-fifth International Ocean and Polar Engineering Conference, June 21–26, 2015
Paper Number: ISOPE-I-15-257
... cylinder is discussed. When the upstream cylinder is free to oscillate, the upstream cylinder's VIV (vortex induced vibrations) affects the response of the downstream cylinder. The recent experimental studies related to this topic are reviewed. The methods to reduce the riser interference and to predict...
Proceedings Papers

Paper presented at the The Twenty-third International Offshore and Polar Engineering Conference, June 30–July 5, 2013
Paper Number: ISOPE-I-13-373
... and on the frequency of oscillation. cylinder oscillation cycle flow visualization image frequency upstream oil & gas oscillation downstream cylinder vortice reservoir surveillance production control cylinder oscillation production monitoring shear layer regime cylinder configuration...
Proceedings Papers

Paper presented at the The Twenty-second International Offshore and Polar Engineering Conference, June 17–22, 2012
Paper Number: ISOPE-I-12-447
... velocity riser interference upstream oil & gas viv vibration blevin vortex cylinder downstream cylinder diameter Wake Induced Riser Interference under VIV at 10^5 Reynolds Jean-Francois Saint-Marcoux Subsea 7 Paris, France Robert D Blevins Consultant San Diego, California, USA ABSTRACT...
Proceedings Papers

Paper presented at the The Twenty-first International Offshore and Polar Engineering Conference, June 19–24, 2011
Paper Number: ISOPE-I-11-555
... cylinder circular cylinder vorticity contour downstream cylinder 3 configuration fluid dynamics drag coefficient cylinder 1 strouhal number upstream oil & gas cylinder 3 vortex street cylinder fourier transform cylinder 2 coefficient downstream cylinder arrangement interference...
Proceedings Papers

Paper presented at the The Twentieth International Offshore and Polar Engineering Conference, June 20–25, 2010
Paper Number: ISOPE-I-10-236
... of the small cylinder on the flow around and forces on the two cylinders were investigated for different gap ratios and position angles. Through their laboratory investigation, Alam and Zhou (2008) showed that with decreasing d/D (where D is the downstream cylinder diameter and d is the upstream cylinder...
Proceedings Papers

Paper presented at the The Twentieth International Offshore and Polar Engineering Conference, June 20–25, 2010
Paper Number: ISOPE-I-10-340
... of three-dimensionality, cylinder spacing ratio and yaw angle as well as their coupling effects. The detailed near wake flow patterns of the yawed cylinders are captured. The effects of vortices from the upstream cylinder on the fluid-dynamic forces acting on the downstream cylinder are discussed...
Proceedings Papers

Paper presented at the The Eighteenth International Offshore and Polar Engineering Conference, July 6–11, 2008
Paper Number: ISOPE-I-08-068
... on a downstream cylinder is influenced by the wake of an upstream cylinder. However, current industry practice does not include the lift force contribution when assessing the riser wake interference. Both effects are considered - the drag reduction on a downstream riser due to it being in the wake of an upstream...
Proceedings Papers

Paper presented at the The Eighteenth International Offshore and Polar Engineering Conference, July 6–11, 2008
Paper Number: ISOPE-I-08-169
... . A longitudinal gap between upstream and downstream cylinder (LUD) was varied by 5D, 7D, 9D, and 10D, respectively. The measurement of the hydrodynamics forces in two, in-line (drag force) and transverse (lift force) directions were performed simultaneously. Frequency of the drag force was found approximately...
Proceedings Papers

Paper presented at the The Eighteenth International Offshore and Polar Engineering Conference, July 6–11, 2008
Paper Number: ISOPE-I-08-418
... cylinder ur 3 upstream cylinder transverse displacement cylinder quartapelle formula ur 7 formula xy displacement amplitude downstream cylinder Vortex Induced Vibrations and Galloping of Two Cylinders Placed in Tandem Arrangement Stéphane Etienne Mechanical Engineering, École Polytechnique de...
Proceedings Papers

Paper presented at the The Seventeenth International Offshore and Polar Engineering Conference, July 1–6, 2007
Paper Number: ISOPE-I-07-259
... region are reported. The wake undergoes considerable modification compared with the static case, and the manner in which the wake responds depends strongly on whether it is the upstream or downstream cylinder which is being oscillated. There are several distinct regions of synchronization between...
Proceedings Papers

Paper presented at the The Seventeenth International Offshore and Polar Engineering Conference, July 1–6, 2007
Paper Number: ISOPE-I-07-390
... The lift and drag forces on a downstream cylinder are strongly affected by the wake of an upstream cylinder. However, the length over which the downstream cylinder lies in the wake of the upstream cylinder largely governs the magnitude of the motion of the downstream cylinder. Models have been...
Proceedings Papers

Paper presented at the The Sixteenth International Offshore and Polar Engineering Conference, May 28–June 2, 2006
Paper Number: ISOPE-I-06-232
... downstream jumper buoyancy tank downstream cylinder wake boundary interaction Paper No. 2006 - Blevins Page 1 of 8 Assessment of Flow-Induced Jumper Interference for Hybrid Riser Tower Robert D. Blevins Consultant San Diego, California USA Paul Jacob MMI Engineering Houston, Texas USA Jean-Francois...
Proceedings Papers

Paper presented at the The Fifteenth International Offshore and Polar Engineering Conference, June 19–24, 2005
Paper Number: ISOPE-I-05-153
... the hydrodynamic loads acting on the cylinders for small spacing, in particular when negative drag is observed on the downstream cylinder. Moreover, drag coefficients Cd1(X) and Cd2(X) on cylinders in tandem depend on Reynolds number (see fig. 3 and 4), thus the need to assess a proper scaling procedure. Vo L X X1...
Proceedings Papers

Paper presented at the The Fifteenth International Offshore and Polar Engineering Conference, June 19–24, 2005
Paper Number: ISOPE-I-05-149
... tandem arrangement cylinder arrangement vibration reynolds number square array arrangement reservoir simulation downstream cylinder upstream oil & gas cylinder diameter viv upstream cylinder coefficient Simulation of High Reynolds Number Flow past Arrays of Circular Cylinders...
Proceedings Papers

Paper presented at the The Fourteenth International Offshore and Polar Engineering Conference, May 23–28, 2004
Paper Number: ISOPE-I-04-263
... ABSTRACT In a multiple array of vertical cylinders, flow patterns are very complex and very interactive between cylinders. The patterns are turbulent and non-linear depending on various factors. The gap and flow incoming velocity of upstream can affect on the downstream cylinder. In this study...

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