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Articoli di riviste sul tema "Offshore structures, CFD"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 12 febbraio 2022

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1

Vasilyev, Leonid, Konstantinos Christakos, and Brian Hannafious. "Treating Wind Measurements Influenced by Offshore Structures with CFD Methods." Energy Procedia 80 (2015): 223–28. http://dx.doi.org/10.1016/j.egypro.2015.11.425.

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2

Peric, Milovan, and Volker Bertram. "Trends in Industry Applications of Computational Fluid Dynamics for Maritime Flows." Journal of Ship Production and Design 27, no. 04 (November 1, 2011): 194–201. http://dx.doi.org/10.5957/jspd.2011.27.4.194.

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This paper surveys developments in Computational Fluid Dynamics (CFD) applications for maritime structures (ships, propellers, and offshore structures) over the past decade. Progress is significant in integrating the process chain, particularly more automated model generation. Increased hardware power and progress in various aspects of the flow solvers allow more sophisticated applications and wider scope of applications. Selected examples taken from industry and research applications show the increasing importance of CFD in earlier design stages.

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3

A. Rahman, Mohd Asamudin, Muhammad Nadzrin Nazri, Ahmad Fitriadhy, Mohammad Fadhli Ahmad, Erwan Hafizi Kasiman, Mohd Azlan Musa, Fatin Alias, and Mohd Hairil Mohd. "A Fundamental CFD Investigation of Offshore Structures for Artificial Coral Reef Development." CFD Letters 12, no. 7 (July 30, 2020): 110–25. http://dx.doi.org/10.37934/cfdl.12.7.110125.

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4

Van den Abeele, F., and J. Vande Voorde. "Stability of offshore structures in shallow water depth." International Journal Sustainable Construction & Design 2, no. 2 (November 6, 2011): 320–33. http://dx.doi.org/10.21825/scad.v2i2.20529.

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The worldwide demand for energy, and in particular fossil fuels, keeps pushing the boundaries of offshoreengineering. Oil and gas majors are conducting their exploration and production activities in remotelocations and water depths exceeding 3000 meters. Such challenging conditions call for enhancedengineering techniques to cope with the risks of collapse, fatigue and pressure containment.On the other hand, offshore structures in shallow water depth (up to 100 meter) require a different anddedicated approach. Such structures are less prone to unstable collapse, but are often subjected to highe

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5

Decorte, Griet, Alessandro Toffoli, Geert Lombaert, and Jaak Monbaliu. "On the Use of a Domain Decomposition Strategy in Obtaining Response Statistics in Non-Gaussian Seas." Fluids 6, no. 1 (January 7, 2021): 28. http://dx.doi.org/10.3390/fluids6010028.

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During recent years, thorough experimental and numerical investigations have led to an improved understanding of dynamic phenomena affecting the fatigue life and survivability of offshore structures, e.g., ringing and springing and extreme wave impacts. However, most of these efforts have focused on modeling either selected extreme events or sequences of highly nonlinear waves impacting offshore structures, possibly overestimating the actual load to be experienced by the structure. Overall, not much has been done regarding short-term statistics. Although clear non-Gaussian statistics and there

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6

Decorte, Griet, Alessandro Toffoli, Geert Lombaert, and Jaak Monbaliu. "On the Use of a Domain Decomposition Strategy in Obtaining Response Statistics in Non-Gaussian Seas." Fluids 6, no. 1 (January 7, 2021): 28. http://dx.doi.org/10.3390/fluids6010028.

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During recent years, thorough experimental and numerical investigations have led to an improved understanding of dynamic phenomena affecting the fatigue life and survivability of offshore structures, e.g., ringing and springing and extreme wave impacts. However, most of these efforts have focused on modeling either selected extreme events or sequences of highly nonlinear waves impacting offshore structures, possibly overestimating the actual load to be experienced by the structure. Overall, not much has been done regarding short-term statistics. Although clear non-Gaussian statistics and there

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7

Wu, Yanling. "Numerical tools to predict the environmental loads for offshore structures under extreme weather conditions." Modern Physics Letters B 32, no. 12n13 (May 10, 2018): 1840039. http://dx.doi.org/10.1142/s0217984918400390.

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In this paper, the extreme waves were generated using the open source computational fluid dynamic (CFD) tools — OpenFOAM and Waves2FOAM — using linear and nonlinear NewWave input. They were used to conduct the numerical simulation of the wave impact process. Numerical tools based on first-order (with and without stretching) and second-order NewWave are investigated. The simulation to predict force loading for the offshore platform under the extreme weather condition is implemented and compared.

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8

Dymarski, Paweł, Ewelina Ciba, and Tomasz Marcinkowski. "Effective Method for Determining Environmental Loads on Supporting Structures for Offshore Wind Turbines." Polish Maritime Research 23, no. 1 (January 1, 2016): 52–60. http://dx.doi.org/10.1515/pomr-2016-0008.

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Abstract This paper presents a description of an effective method for determining loads due to waves and current acting on the supporting structures of the offshore wind turbines. This method is dedicated to the structures consisting of the cylindrical or conical elements as well as (truncates) pyramids of polygon with a large number of sides (8 or more). The presented computational method is based on the Morison equation, which was originally developed only for cylindrically shaped structures. The new algorithm shown here uses the coefficients of inertia and drag forces that were calculated f

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9

Dervilis, Nikolaos, A. C. W. Creech, A. E. Maguire, Ifigeneia Antoniadou, R. J. Barthorpe, and Keith Worden. "An SHM View of a CFD Model of Lillgrund Wind Farm." Applied Mechanics and Materials 564 (June 2014): 164–69. http://dx.doi.org/10.4028/www.scientific.net/amm.564.164.

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Reliability of offshore wind farms is one of the key areas for the successful implementation of these renewable power plants in the energy arena. Failure of the wind turbine (WT) in general could cause massive financial losses but especially for structures that are operating in offshore sites. Structural Health Monitoring (SHM) of WTs is essential in order to ensure not only structural safety but also avoidance of overdesign of components that could lead to economic and structural inefficiency. A preliminary analysis of a machine learning approach in the context of WT SHM is presented here; it

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10

Rahman, Shaikh Atikur, Zubair Imam Syed, John V. Kurian, and M. S. Liew. "Structural Response of Offshore Blast Walls under Accidental Explosion." Advanced Materials Research 1043 (October 2014): 278–82. http://dx.doi.org/10.4028/www.scientific.net/amr.1043.278.

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Adequate blast resistant barriers are requisite to protect personnel and critical systems from the consequences of an accidental explosion and subsequent fire. Many of the blast walls currently installed in offshore structures were designed using simplified calculation approaches like Single Degree of Freedom models (SDOF) as recommended in many design guidelines. Over simplified and idealised explosion load used for response calculation and design of blast wall can lead to inadequate or overdesign of offshore blast walls. Due to lack of presence of a well-accepted design guidelines supported

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11

Jujuly, M. M., Mohammad Azizur Rahman, Aaron Maynard, and Matthew Adey. "Hydrate-Induced Vibration in an Offshore Pipeline." SPE Journal 25, no. 02 (December 31, 2019): 732–43. http://dx.doi.org/10.2118/187378-pa.

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Summary Gas-hydrate plugging poses an operational challenge to offshore petroleum production and transportation. In this study, a computational-fluid-dynamics (CFD) model that uses ANSYS Fluent (ANSYS 2019) multiphase-flow-modeling techniques to simulate and analyze the effect of gas-hydrate flow in pipelines is proposed. For this purpose, the study attempted to integrate the ANSYS Fluent model with an existing commercial subsea-pipeline-visualization tool. To validate the simulation results, two case studies were conducted. The first study was about a pipeline whose dimensions are based on th

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12

Lara, Javier L., Inigo J. Losada, Gabriel Barajas, Maria Maza, and Benedetto Di Paolo. "RECENT ADVANCES IN 3D MODELLING OF WAVE-STRUCTURE INTERACTION WITH CFD MODELS." Coastal Engineering Proceedings, no. 36 (December 30, 2018): 91. http://dx.doi.org/10.9753/icce.v36.waves.91.

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Numerical modelling of the interaction of water waves with coastal structures has continuously been among the most relevant challenges in coastal engineering research and practice. During the last years, 3D modelling based on RANS-type equations, has been the dominant methodology to address the mathematical modelling of wave and coastal structure interaction. However, the three-dimensionality of many flowstructure interactions processes demands overcoming existing modelling limitations. Under some circumstances relevant three-dimensional processes are still tackled using physical modelling. It

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13

Zhou, Xiao, Liu, Incecik, Peyrard, Li, and Pan. "Numerical Modelling of Dynamic Responses of a Floating Offshore Wind Turbine Subject to Focused Waves." Energies 12, no. 18 (September 9, 2019): 3482. http://dx.doi.org/10.3390/en12183482.

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In this paper, we present numerical modelling for the investigation of dynamic responses of a floating offshore wind turbine subject to focused waves. The modelling was carried out using a Computational Fluid Dynamics (CFD) tool. We started with the generation of a focused wave in a numerical wave tank based on a first-order irregular wave theory, then validated the developed numerical method for wave-structure interaction via a study of floating production storage and offloading (FPSO) to focused wave. Subsequently, we investigated the wave-/wind-structure interaction of a fixed semi-submersi

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14

Stahlmann, Arne, and Torsten Schlurmann. "INVESTIGATIONS ON SCOUR DEVELOPMENT AT TRIPOD FOUNDATIONS FOR OFFSHORE WIND TURBINES: MODELING AND APPLICATION." Coastal Engineering Proceedings 1, no. 33 (October 25, 2012): 90. http://dx.doi.org/10.9753/icce.v33.sediment.90.

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Regarding offshore constructions, there is still a lack in knowledge of scour progression for complex structures like foundations for offshore wind energy converters at present, which is however necessary for its dimensioning. As an example of such complex structure types, tripod foundations are constructed in German offshore wind farms at present. In order to describe physical processes and influencing factors on scour progression from a scientific point of view, comprehensive investigations on the scouring phenomena for tripod foundations have been carried out and will be partly presented he

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15

Wang, Weizhi, Arun Kamath, and Hans Bihs. "IRREGULAR WAVE MODELLING WITH CFD IN SULAFJORD FOR THE E39 PROJECT." Coastal Engineering Proceedings, no. 36 (December 30, 2018): 45. http://dx.doi.org/10.9753/icce.v36.waves.45.

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The E39 project aims at building a continuous ferry-free coastal highway along the west coast of Norway. Sulafjord is one of the fjords where ferries are to be replaced with floating bridges or floating tunnels. The floating structures demand accurate and realistic numerical simulations of the wave propagation and transformation in the fjords. The Norwegian coastline is characterized by dramatic water depth changes and deep water conditions. The coastal water also contains both swells and local wind-generated waves. These conditions, along with series of islands outside the fjords and very irr

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16

Teigen, P., V. P. Przulj, and B. A. Younis. "A CFD Investigation Into the Effects of Current Incidence on the Hydrodynamic Loading on a Deepwater TLP." Journal of Offshore Mechanics and Arctic Engineering 121, no. 2 (May 1, 1999): 109–15. http://dx.doi.org/10.1115/1.2830074.

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The use in the offshore engineering industry of computational fluid dynamics (CFD) to estimate the hydrodynamic forces due to steady, turbulent currents on offshore structures has so far been rather limited. This is largely due to the uncertainties inherent in obtaining accurate solutions to the governing Navier-Stokes equations, particularly for complex geometries and at high Reynolds numbers. In this study, we assess the contributions to such uncertainties arising from a number of factors. Those include the number of nodes in the computational mesh used to overlay the flow domain, the choice

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17

Cui, W.-C. "A feasible study of fatigue life prediction for marine structures based on crack propagation analysis." Proceedings of the Institution of Mechanical Engineers, Part M: Journal of Engineering for the Maritime Environment 217, no. 1 (March 1, 2003): 11–23. http://dx.doi.org/10.1243/147509003321623112.

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Marine structures such as ships and offshore platforms are designed with damage tolerance. This requires accurate prediction of fatigue crack growth under service conditions. Current fatigue strength assessment methods for marine structures are largely based on the cumulative fatigue damage (CFD) theory using stress-endurance (S-N) curves. The effects of initial defects and the load sequence have been neglected. The extent of final fatigue failure in real structures is also not specified. These result in a large scatter of the predicted fatigue lives. In the fatigue community, more and more re

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18

Cornett, Andrew. "EXTREME WAVE PRESSURES AND LOADS ON A PILE-SUPPORTED WHARF DECK - INFLUENCES OF AIR GAP AND WAVE DIRECTION." Coastal Engineering Proceedings, no. 36 (December 30, 2018): 5. http://dx.doi.org/10.9753/icce.v36.waves.5.

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Many deck-on-pile structures are located in shallow water depths at elevations low enough to be inundated by large waves during intense storms or tsunami. Many researchers have studied wave-in-deck loads over the past decade using a variety of theoretical, experimental, and numerical methods. Wave-in-deck loads on various pile supported coastal structures such as jetties, piers, wharves and bridges have been studied by Tirindelli et al. (2003), Cuomo et al. (2007, 2009), Murali et al. (2009), and Meng et al. (2010). All these authors analyzed data from scale model tests to investigate the pres

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19

VIDYA, C., J. SHEEJA, and M. SEKAR. "TOWARDS REDUCING COMPUTATIONAL EFFORT IN VORTEX INDUCED VIBRATION PREDICTIONS OF A CYLINDRICAL RISER." Periódico Tchê Química 16, no. 33 (March 20, 2019): 841–53. http://dx.doi.org/10.52571/ptq.v16.n33.2019.856_periodico33_pgs_841_853.pdf.

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Vibrations induced by flow, generally referred to as vortex induced vibrations, are of great importance in the design of marine risers. These flexible cylindrical risers undergo vibrations of very high amplitude when the vortex shedding frequency matches the natural frequency of the riser. Such vibrations are capable of putting the safety of crew working on offshore platforms in question. Hence the prediction of response of such structures is considered very important. Although a lot of numerical work has been done in this field treating the problem as a two-way fluid structure interaction, th

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20

Shang, Zhaohui, Huibin Yan, Weidong Ruan, and Yong Bai. "A Study on a Quantitative Analysis Method for Fire and Explosion Risk Assessment of Offshore Platforms." Advances in Civil Engineering 2020 (October 9, 2020): 1–20. http://dx.doi.org/10.1155/2020/3098719.

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Proper design of the explosion loads is of vital importance in the risk assessment of explosions for offshore oil and gas installations. A quantitative assessment method for gas explosion loads in process modules of offshore platform is proposed in this paper. The proposed approach achieves the following three objectives: (a) defining a suitable number of leak scenarios quantitatively based on the Latin Hypercube Sampling (LHS) technique and statistical analysis; (b) defining the explosion scenarios according to the computational fluid dynamics (CFD) dispersion analysis results in the sampled

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21

Dharmavasan, S., and W. D. Dover. "Nondestructive Evaluation of Offshore Structures Using Fracture Mechanics." Applied Mechanics Reviews 41, no. 2 (February 1, 1988): 36–49. http://dx.doi.org/10.1115/1.3151880.

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Developments in fast modelling of processes, materials response and methodology in combination with appropriate knowledge based systems opens up the possibility of linking CAD/CAM with Computer Aided Serviceability (CAS) for use in a few industries. This paper reviews the tools and techniques which are available and being developed to implement this philosophy in non-destructive evaluation of offshore structures using fracture mechanics.

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22

Seo, Junwon, William Schaffer, Monique Head, Mehdi Shokouhian, and Eunsoo Choi. "Integrated FEM and CFD Simulation for Offshore Wind Turbine Structural Response." International Journal of Steel Structures 19, no. 4 (January 29, 2019): 1112–24. http://dx.doi.org/10.1007/s13296-018-0191-y.

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23

Ahmed, Mushtaq, Zafarullah Nizamani, Akihiko Nakayama, and Montasir Osman. "Some Recent Fluid-Structure Interaction Approaches for the Wave Current Behaviour With Offshore Structures." CFD Letters 12, no. 9 (September 30, 2020): 15–26. http://dx.doi.org/10.37934/cfdl.12.9.1526.

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24

Elhanafi, Ahmed, Gregor Macfarlane, and Dezhi Ning. "Hydrodynamic performance of single–chamber and dual–chamber offshore–stationary Oscillating Water Column devices using CFD." Applied Energy 228 (October 2018): 82–96. http://dx.doi.org/10.1016/j.apenergy.2018.06.069.

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25

Li, Ru-Yu, Jin-Jian Chen, and Chen-Cong Liao. "Numerical Study on Interaction between Submarine Landslides and a Monopile Using CFD Techniques." Journal of Marine Science and Engineering 9, no. 7 (July 2, 2021): 736. http://dx.doi.org/10.3390/jmse9070736.

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Offshore installations with pile foundations in shallow water are vulnerable to submarine landslides, which cause serious damage to engineering facilities, loss of life, and loss of money. Due to a shortage of real observation data and the difficulty of reproduction, we lack insight into the interaction behavior between submarine landslides and monopiles. This study capitalized on ANSYS Fluent 20.0 to develop a three-dimensional biphasic (water and slurry) numerical model. This CFD model was used to analyze the interaction between a monopile and submarine landslides at different flow heights.

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26

Goldan, Michael, and Robert J. G. A. Kroon. "As-Built Product Modeling and Reverse Engineering in Shipbuilding Through Combined Digital Photogrammetry and CAD/CAM Technology." Journal of Ship Production 19, no. 02 (May 1, 2003): 98–104. http://dx.doi.org/10.5957/jsp.2003.19.2.98.

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Ship repair, as a technological "lesser brother" of shipbuilding, still contains major elements of manual labor. In the past years, ship repair and the conversion of ships and offshore structures came to rely increasingly on modern computer-aided design and manufacturing (CAD and CAM) information systems for speedy generation of the required engineering information. An often-encountered problem is the lack of product information in electronic form or in any other form. Such information is needed for engineering of new parts for damaged or converted ships and platforms. In such cases one needs

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27

Liu, Yichao, Daoyi Chen, and Sunwei Li. "The artificial generation of the equilibrium marine atmospheric boundary layer for the CFD simulation of offshore wind turbines." Journal of Wind Engineering and Industrial Aerodynamics 183 (December 2018): 44–54. http://dx.doi.org/10.1016/j.jweia.2018.10.008.

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Han, Young-Soo, Jaejoon Lee, Jungmin Lee, Wonhyuk Lee, and Kyungho Lee. "3D CAD data extraction and conversion for application of augmented/virtual reality to the construction of ships and offshore structures." International Journal of Computer Integrated Manufacturing 32, no. 7 (April 11, 2019): 658–68. http://dx.doi.org/10.1080/0951192x.2019.1599440.

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29

Buschinelli, P., J. D. Salazar, D. Regner, D. Oliveira, M. Machado, G. Marcellino, D. C. Sales, et al. "TARGETLESS PHOTOGRAMMETRY NETWORK SIMULATION FOR INSPECTION PLANNING IN OIL AND GAS INDUSTRY." ISPRS Annals of Photogrammetry, Remote Sensing and Spatial Information Sciences V-1-2020 (August 3, 2020): 285–91. http://dx.doi.org/10.5194/isprs-annals-v-1-2020-285-2020.

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Abstract. The oil and gas offshore industry demands regular inspections of components and structures that are subjected to extreme operational and environmental conditions. In this context, risers are pipelines that transport mainly oil, gas, water, and cables between submarine structures and the surface offshore platform, in the portion not touching the ocean floor. The emerged part of these risers is typically inspected by industrial climbing, which is a very time-consuming activity, has high operational costs, is dangerous and has a strong dependence on inspector skills. Remotely Piloted Ai

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30

Sacchi, Marco, Giuseppe De Natale, Volkhard Spiess, Lena Steinmann, Valerio Acocella, Marta Corradino, Shanaka de Silva, et al. "A roadmap for amphibious drilling at the Campi Flegrei caldera: insights from a MagellanPlus workshop." Scientific Drilling 26 (December 2, 2019): 29–46. http://dx.doi.org/10.5194/sd-26-29-2019.

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Abstract. Large calderas are among the Earth's major volcanic features. They are associated with large magma reservoirs and elevated geothermal gradients. Caldera-forming eruptions result from the withdrawal and collapse of the magma chambers and produce large-volume pyroclastic deposits and later-stage deformation related to post-caldera resurgence and volcanism. Unrest episodes are not always followed by an eruption; however, every eruption is preceded by unrest. The Campi Flegrei caldera (CFc), located along the eastern Tyrrhenian coastline in southern Italy, is close to the densely populat

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Martin, Tobias, and Hans Bihs. "A CFD Approach for Modelling the Fluid-Structure Interaction of Offshore Aquaculture Cages and Waves." Journal of Offshore Mechanics and Arctic Engineering, September 14, 2021, 1–10. http://dx.doi.org/10.1115/1.4052421.

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Abstract Open ocean aquaculture cages became recently a promising alternative to traditional fish cage designs. The offshore environment implies larger loads on the structures and higher risk of fish loss. Floating rigid aquaculture cages with stiff nets are considered as a possible solution to cope with these new challenges. Their design process requires more advanced tools to account for the non-linear fluid-structure interaction. This paper presents a suitable numerical approach for analysing the interaction of offshore aquaculture cages and waves using Computational Fluid Dynamics. Here, a

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Aggarwal, Ankit, Pietro D. Tomaselli, Erik Damgaard Christensen, and Hans Bihs. "Computational Fluid Dynamics Investigations of Breaking Focused Wave-Induced Loads on a Monopile and the Effect of Breaker Location." Journal of Offshore Mechanics and Arctic Engineering 142, no. 2 (November 16, 2019). http://dx.doi.org/10.1115/1.4045187.

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Abstract The design of new offshore structures requires the calculation of the wave-induced loads. In this regard, the computational fluid dynamics (CFD) methodology has shown to be a reliable tool, in the case of breaking waves especially. In this paper, two CFD models are tested in the reproduction of the experimental spilling waves impacting a circular cylinder for four different wave impact scenarios for focused waves. The numerical and experimental free surface elevations at different locations around the cylinder are also compared to verify the both numerical models. The numerical result

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Chen Ong, Muk, Eirik Trygsland, and Dag Myrhaug. "Numerical Study of Seabed Boundary Layer Flow Around Monopile and Gravity-Based Wind Turbine Foundations." Journal of Offshore Mechanics and Arctic Engineering 139, no. 4 (May 5, 2017). http://dx.doi.org/10.1115/1.4036208.

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Computational fluid dynamics (CFD) has been used to study the seabed boundary layer flow around monopile and gravity-based offshore wind turbine foundations. The gravity-based foundation has a hexagonal bottom slab (bottom part). The objective of the present study is to investigate the formation of horseshoe vortex and flow structures around two different bottom-fixed offshore wind turbine foundations in order to provide an assessment of potential scour for engineering design. Three-dimensional CFD simulations have been performed using Spalart–Allmaras delayed detached eddy simulation (SADDES)

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Nematbakhsh, Ali, Zhen Gao, and Torgeir Moan. "Benchmarking of a Computational Fluid Dynamics-Based Numerical Wave Tank for Studying Wave Load Effects on Fixed and Floating Offshore Structures." Journal of Offshore Mechanics and Arctic Engineering 139, no. 3 (April 5, 2017). http://dx.doi.org/10.1115/1.4035475.

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A computational fluid dynamics (CFD) based numerical wave tank (NWT) is developed and verified to study wave load effects on fixed and free floating offshore structures. The model is based on solving Navier–Stokes equations on a structured grid, level set method for tracking the free surface, and an immersed boundary method for studying wave–structure interaction. This paper deals with establishing and verifying a CFD-based NWT. Various concerns that arise during this establishment are discussed, namely effects of wave reflection which might affect the structure response, damping of waves in d

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"Numerical Examination on the Effect of Internal Fluid Presssure on the Hydrodynamic Response of a Marine Riser." International Journal of Innovative Technology and Exploring Engineering 8, no. 11S (October 11, 2019): 1310–15. http://dx.doi.org/10.35940/ijitee.k1265.09811s19.

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Marine risers are long slender structures which links the floating vessel on the sea surface and its manifold on the sea bottom. It acts as a transportation means for the hydrocarbon resources underneath the sea bed. A riser mainly undergoes hydrodynamic loading which leads to Vortex induced vibrations (VIV) or Flow induced vibrations. These are motions induced on bodies interacting with an external fluid flow producing periodic irregularities on the flow which leads to fatigue damage of offshore oil exploration and production risers. Therefore, suppressing of VIV by providing helical strakes,

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Gonçalves, Rodolfo Trentin, Shinichiro Hirabayashi, Guilherme Vaz, and Hideyuki Suzuki. "Force Measurements of the Flow Around Arrays of Three and Four Columns With Different Geometry Sections, Spacing Ratios, and Incidence Angles." Journal of Offshore Mechanics and Arctic Engineering 142, no. 2 (November 16, 2019). http://dx.doi.org/10.1115/1.4045212.

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Abstract An experimental campaign for the flow around a stationary array of three and four columns with low aspect ratio, H/L = 1.5, piercing the water free surface, was carried out in a towing tank. These numbers of columns correspond to typical multi-column offshore systems, such as semi-submersibles (SS), tension leg platforms (TLPs), and floating offshore wind turbines (FOWTs). Three parameters were investigated: the spacing ratio between column centers (from two up to four characteristic lengths), current incidence angles, and column section geometries (circular, square, and diamond). The

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Bihs, Hans, Arun Kamath, Ankit Aggarwal, and Csaba Pakozdi. "Efficient Wave Modeling Using Nonhydrostatic Pressure Distribution and Free Surface Tracking on Fixed Grids." Journal of Offshore Mechanics and Arctic Engineering 141, no. 4 (April 8, 2019). http://dx.doi.org/10.1115/1.4043179.

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For the estimation of wave loads on offshore structures, relevant extreme wave events need to be identified. In order to achieve this, long-term wave simulations of relatively large scales need to be performed. Computational fluid dynamics (CFD) based numerical wave tanks with an interface capturing two-phase flow approach typically require too large computational resources. In this paper, a three-dimensional (3D) nonhydrostatic wave model is presented, which solves the Navier–Stokes equations and employs an interface tracking method based on the continuity of the horizontal velocities along t

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38

Ebrahimnejad, L., K. D. Janoyan, H. Yadollahi Farsani, D. T. Valentine, and P. Marzocca. "Efficient Predictions of Unsteady Viscous Flows Around Bluff Bodies by Aerodynamic Reduced Order Models." Journal of Offshore Mechanics and Arctic Engineering 136, no. 1 (October 25, 2013). http://dx.doi.org/10.1115/1.4025544.

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This paper describes an efficient reduced order model (ROM) applied in the aerodynamic analysis of bluff bodies. The proposed method, which is based on eigensystem realization algorithm (ERA), uses the impulse response of the system obtained by computational fluid dynamics (CFD) analysis to construct a ROM that can accurately predict the response of the system to any arbitrary input. In order to study the performance of the proposed technique, three different geometries including elliptical and rectangular sections as well as the deck cross section of Great Belt Bridge (GBB) were considered. T

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39

Bihs, Hans, Weizhi Wang, Csaba Pakozdi, and Arun Kamath. "REEF3D::FNPF—A Flexible Fully Nonlinear Potential Flow Solver." Journal of Offshore Mechanics and Arctic Engineering 142, no. 4 (February 20, 2020). http://dx.doi.org/10.1115/1.4045915.

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Abstract In situations where the calculation of ocean wave propagation and impact on structures are required, fast numerical solvers are desired in order to find relevant wave events. Computational fluid dynamics (CFD)-based numerical wave tanks (NWTs) emphasize on the hydrodynamic details such as fluid–structure interaction, which make them less ideal for the event identification due to the large computational resources involved. Therefore, a computationally efficient numerical wave model is needed to identify the events both for offshore deep-water wave fields and coastal wave fields where t

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40

Bihs, Hans, Mayilvahanan Alagan Chella, Arun Kamath, and Øivind Asgeir Arntsen. "Numerical Investigation of Focused Waves and Their Interaction With a Vertical Cylinder Using REEF3D." Journal of Offshore Mechanics and Arctic Engineering 139, no. 4 (May 10, 2017). http://dx.doi.org/10.1115/1.4036206.

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For the stability of offshore structures, such as offshore wind foundations, extreme wave conditions need to be taken into account. Waves from extreme events are critical from the design perspective. In a numerical wave tank, extreme waves can be modeled using focused waves. Here, linear waves are generated from a wave spectrum. The wave crests of the generated waves coincide at a preselected location and time. Focused wave generation is implemented in the numerical wave tank module of REEF3D, which has been extensively and successfully tested for various wave hydrodynamics and wave–structure

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41

Chella, Mayilvahanan Alagan, Hans Bihs, Dag Myrhaug, and Øivind Asgeir Arntsen. "Numerical Modeling of Breaking Wave Kinematics and Wave Impact Pressures on a Vertical Slender Cylinder." Journal of Offshore Mechanics and Arctic Engineering 141, no. 5 (February 15, 2019). http://dx.doi.org/10.1115/1.4042265.

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Wave loads from breaking waves on offshore wind turbine (OWT) substructures in shallow waters still remain uncertain. The interaction of breaking waves with structures is characterized by complex free surface deformations, instantaneous impact of the water mass against the structure, and consequently large wave forces on the structures. The main objective of the paper is to investigate wave impact pressures and kinematics during the interaction of breaking waves with a vertical cylinder using the open-source computational fluid dynamics (CFD) model REEF3D. The model is based on the Reynolds-av

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42

Sasikumar, Athul, Arun Kamath, Onno Musch, Hans Bihs, and Øivind A. Arntsen. "Numerical Modeling of Berm Breakwater Optimization With Varying Berm Geometry Using REEF3D." Journal of Offshore Mechanics and Arctic Engineering 141, no. 1 (August 13, 2018). http://dx.doi.org/10.1115/1.4040508.

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Harbors are important infrastructures for an offshore production chain. These harbors are protected from the actions of sea by breakwaters to ensure safe loading, unloading of vessels and also to protect the infrastructure. In current literature, research regarding the design of these structures is majorly based on physical model tests. In this study a new tool, a three-dimensional (3D) numerical model is introduced. The open-source computational fluid dynamics (CFD) model REEF3D is used to study the design of berm breakwaters. The model uses the Volume-averaged Reynolds-averaged Navier-Stokes

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43

Koto, Jaswar, and Abdul Khair Junaidi. "Analysis of Vortex-Induced Vibration of Riser using Spalart-Almaras Model." Jurnal Teknologi 69, no. 7 (July 15, 2014). http://dx.doi.org/10.11113/jt.v69.3260.

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Vortex-induced vibration is natural phenomena where an object is exposed to moving fluid caused vibration of the object. Vortex-induced vibration occurred due to vortex shedding behind the object. One of the offshore structures that experience this vortex-induced vibration is riser. The riser experience vortex-induced vibration due to vortex shedding caused by external load which is sea current. The effect of this vortex shedding to the riser is fatigue damage. Vortex-induced vibration of riser becomes the main concern in oil and gas industry since there will be a lots of money to be invested

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44

Kamath, Arun, Hans Bihs, and Øivind A. Arntsen. "Study of Water Impact and Entry of a Free Falling Wedge Using Computational Fluid Dynamics Simulations." Journal of Offshore Mechanics and Arctic Engineering 139, no. 3 (March 28, 2017). http://dx.doi.org/10.1115/1.4035384.

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Abstract (sommario):

Many offshore constructions and operations involve water impact problems such as water slamming onto a structure or free fall of objects with subsequent water entry and emergence. Wave slamming on semisubmersibles, vertical members of jacket structures, crane operation of a diving bell, and dropping of free fall lifeboats are some notable examples. The slamming and water entry problems lead to large instantaneous impact pressures on the structure, accompanied with complex free surface deformations. These need to be studied in detail in order to obtain a better understanding of the fluid physic

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45

Fan, Ning, Wangcheng Zhang, Fauzan Sahdi, and Tingkai Nian. "Evaluation of horizontal submarine slide impact force on pipeline via a modified hybrid geotechnical-fluid dynamics framework." Canadian Geotechnical Journal, August 27, 2021. http://dx.doi.org/10.1139/cgj-2021-0089.

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Abstract (sommario):

There are situations in offshore energy development where potential impact forces between submarine slides and pipelines need to be estimated. The horizontal slide-pipeline impact force, parallel to the main travel direction of the sliding mass and normal to the pipeline axis, is generally dominant compared to other force components, and hence of particular concern. In practice, pipelines may be suspended at varying distances above the seabed (gap) and existing methods do not consider how this will affect the horizontal slide-pipeline forces. This paper investigates the effects of pipeline-sea

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46

"Simulación numérica del sloshing." Revista ECIPeru, January 10, 2019, 68–75. http://dx.doi.org/10.33017/reveciperu2011.0012/.

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Simulación numérica del sloshing Numerical simulation of sloshing Miguel A. Celis Carbajal, Juan B.V.Wanderley, Marcelo A.S. Neves Universidad Federal de Rio de Janeiro/COPPE, Rio de Janeiro, RJ, Brasil DOI: https://doi.org/10.33017/RevECIPeru2011.0012/ RESUMEN El sloshing es de gran importancia en la dinámica de los buques y plataformas offshore. Es uno de los factores que pueden causar cargas indeseables e incluso la zozobra de los cuerpos flotantes. Esto sucede cuando el buque está en condiciones no deseadas, tales como la inundación progresiva en condiciones de avería. El objetivo es repre

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47

Taylor, Rocky S., Ian J. Jordaan, Chuanke Li, and Denise Sudom. "Local Design Pressures for Structures in Ice: Analysis of Full-Scale Data." Journal of Offshore Mechanics and Arctic Engineering 132, no. 3 (June 17, 2010). http://dx.doi.org/10.1115/1.4000504.

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Abstract (sommario):

The design of structures for ice conditions requires knowledge of local ice pressures to allow for appropriate levels of structural strengthening. Full-scale field data are keys to enhancing our understanding and modeling of ice behavior. Data collected during icebreaker ramming events represent an important source of information for use in design load estimation, and the evaluation of design methodologies. This paper examines several ship-ice interaction data sets using the ‘event-maximum’ method of local pressure analysis developed by Jordaan and et al. (1993, “Probabilistic Analysis of Loca

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