19
Ocean Engineering 28 (2001) 585–602 Estimating the hydrodynamic forces on a mini TLP with computational uid dynamics and design-code techniques B.A. Younis a,* , P. Teigen b , V.P. Przulj a a  Department of Civil Engineering, City University, London EC1V 0HB, UK b STATOIL, Postuttak, N-7005 Trondheim, Norway Received 10 October 1999; accepted 12 January 2000 Abstract This paper reports on the prediction of the hydrodynamic forces on a full-scale mini Tension Leg Platform (TLP) of the type typically deployed for deep-sea operation. Two alternative prediction techniques were used: Computational Fluid Dynamics (CFD), which is based on the solution of the fundamental equations that govern turbulent uid ow; and ‘engineering’ calculations based on force coefcients derived from a design code that is in routine use in the Offshore Industry. The results from these two techniques were compared with each other and with experimental data obtained from wind-tunnel and towing-tank tests on a 1–70 scale model. It was found that the two techniques, while yielding very similar predictions for the front TLP members, give substantially different predictions for the aft members — a result that is consistent with the presence of signicant interference effects that are captured only by the CFD. The design code yielded the highest value for the global drag coefcient, followed very closely by the towing-tank result. The wind-tunnel tests produced the lowest value for this parameter. The CFD predictions, which were the rst to be obtained in this study, fall in the mid-range of the experimental values. These and other results are discussed in the context of the use of CFD in practical design applications. © 2000 Elsevier Science Ltd. All rights reserved. Keywords: Hydrodynamic loads; Fluid–structure interactions; TLP; CFD * Corr espond ing author. Fax: +44-020-74778570.  E-mail address: b.a.younis@c ity.ac .uk (B.A. Youn is). 0029-8018/01/$ - see front matter © 2000 Elsevier Science Ltd. All rights reserved. PII: S 0029-8018(00)00019 -6

Estimating the Hydrodynamic Force on Mini Tension Leg Platform

Embed Size (px)

Citation preview

Page 1: Estimating the Hydrodynamic Force on Mini Tension Leg Platform

7/27/2019 Estimating the Hydrodynamic Force on Mini Tension Leg Platform

http://slidepdf.com/reader/full/estimating-the-hydrodynamic-force-on-mini-tension-leg-platform 1/18

Page 2: Estimating the Hydrodynamic Force on Mini Tension Leg Platform

7/27/2019 Estimating the Hydrodynamic Force on Mini Tension Leg Platform

http://slidepdf.com/reader/full/estimating-the-hydrodynamic-force-on-mini-tension-leg-platform 2/18

Page 3: Estimating the Hydrodynamic Force on Mini Tension Leg Platform

7/27/2019 Estimating the Hydrodynamic Force on Mini Tension Leg Platform

http://slidepdf.com/reader/full/estimating-the-hydrodynamic-force-on-mini-tension-leg-platform 3/18

Page 4: Estimating the Hydrodynamic Force on Mini Tension Leg Platform

7/27/2019 Estimating the Hydrodynamic Force on Mini Tension Leg Platform

http://slidepdf.com/reader/full/estimating-the-hydrodynamic-force-on-mini-tension-leg-platform 4/18

Page 5: Estimating the Hydrodynamic Force on Mini Tension Leg Platform

7/27/2019 Estimating the Hydrodynamic Force on Mini Tension Leg Platform

http://slidepdf.com/reader/full/estimating-the-hydrodynamic-force-on-mini-tension-leg-platform 5/18

Page 6: Estimating the Hydrodynamic Force on Mini Tension Leg Platform

7/27/2019 Estimating the Hydrodynamic Force on Mini Tension Leg Platform

http://slidepdf.com/reader/full/estimating-the-hydrodynamic-force-on-mini-tension-leg-platform 6/18

Page 7: Estimating the Hydrodynamic Force on Mini Tension Leg Platform

7/27/2019 Estimating the Hydrodynamic Force on Mini Tension Leg Platform

http://slidepdf.com/reader/full/estimating-the-hydrodynamic-force-on-mini-tension-leg-platform 7/18

Page 8: Estimating the Hydrodynamic Force on Mini Tension Leg Platform

7/27/2019 Estimating the Hydrodynamic Force on Mini Tension Leg Platform

http://slidepdf.com/reader/full/estimating-the-hydrodynamic-force-on-mini-tension-leg-platform 8/18

Page 9: Estimating the Hydrodynamic Force on Mini Tension Leg Platform

7/27/2019 Estimating the Hydrodynamic Force on Mini Tension Leg Platform

http://slidepdf.com/reader/full/estimating-the-hydrodynamic-force-on-mini-tension-leg-platform 9/18

Page 10: Estimating the Hydrodynamic Force on Mini Tension Leg Platform

7/27/2019 Estimating the Hydrodynamic Force on Mini Tension Leg Platform

http://slidepdf.com/reader/full/estimating-the-hydrodynamic-force-on-mini-tension-leg-platform 10/18

Page 11: Estimating the Hydrodynamic Force on Mini Tension Leg Platform

7/27/2019 Estimating the Hydrodynamic Force on Mini Tension Leg Platform

http://slidepdf.com/reader/full/estimating-the-hydrodynamic-force-on-mini-tension-leg-platform 11/18

Page 12: Estimating the Hydrodynamic Force on Mini Tension Leg Platform

7/27/2019 Estimating the Hydrodynamic Force on Mini Tension Leg Platform

http://slidepdf.com/reader/full/estimating-the-hydrodynamic-force-on-mini-tension-leg-platform 12/18

Page 13: Estimating the Hydrodynamic Force on Mini Tension Leg Platform

7/27/2019 Estimating the Hydrodynamic Force on Mini Tension Leg Platform

http://slidepdf.com/reader/full/estimating-the-hydrodynamic-force-on-mini-tension-leg-platform 13/18

Page 14: Estimating the Hydrodynamic Force on Mini Tension Leg Platform

7/27/2019 Estimating the Hydrodynamic Force on Mini Tension Leg Platform

http://slidepdf.com/reader/full/estimating-the-hydrodynamic-force-on-mini-tension-leg-platform 14/18

Page 15: Estimating the Hydrodynamic Force on Mini Tension Leg Platform

7/27/2019 Estimating the Hydrodynamic Force on Mini Tension Leg Platform

http://slidepdf.com/reader/full/estimating-the-hydrodynamic-force-on-mini-tension-leg-platform 15/18

Page 16: Estimating the Hydrodynamic Force on Mini Tension Leg Platform

7/27/2019 Estimating the Hydrodynamic Force on Mini Tension Leg Platform

http://slidepdf.com/reader/full/estimating-the-hydrodynamic-force-on-mini-tension-leg-platform 16/18

Page 17: Estimating the Hydrodynamic Force on Mini Tension Leg Platform

7/27/2019 Estimating the Hydrodynamic Force on Mini Tension Leg Platform

http://slidepdf.com/reader/full/estimating-the-hydrodynamic-force-on-mini-tension-leg-platform 17/18

Page 18: Estimating the Hydrodynamic Force on Mini Tension Leg Platform

7/27/2019 Estimating the Hydrodynamic Force on Mini Tension Leg Platform

http://slidepdf.com/reader/full/estimating-the-hydrodynamic-force-on-mini-tension-leg-platform 18/18