Bibliografías temáticas / Hydrodynamic Forces

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Literatura académica sobre el tema "Hydrodynamic Forces"

Autor: Grafiati

Publicado: 4 de junio de 2021

Última modificación: 6 de septiembre de 2023

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Artículos de revistas sobre el tema "Hydrodynamic Forces"

Kolkman, P. A. "Hydrodynamic forces". Journal of Fluids and Structures 6, n.º 4 (julio de 1992): 524. http://dx.doi.org/10.1016/0889-9746(92)90030-7.

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Chaudhuri, A. K. "Viscous Hydrodynamic Model for Relativistic Heavy Ion Collisions". Advances in High Energy Physics 2013 (2013): 1–25. http://dx.doi.org/10.1155/2013/693180.

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Viscous hydrodynamical modeling of relativistic heavy ion collisions has been highly successful in explaining bulk of the experimental data in RHIC and LHC energy collisions. We briefly review viscous hydrodynamics modeling of high energy nuclear collisions. Basic ingredients of the modeling, the hydrodynamic equations, relaxation equations for dissipative forces, are discussed. Hydrodynamical modeling being a boundary value problem, we discuss the initial conditions, freeze-out process. We also show representative simulation results in comparison with experimental data. We also discuss the recent developments in event-by-event hydrodynamics.

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Ivlev, B. I. "Hydrodynamic fluctuation forces". Journal of Physics: Condensed Matter 14, n.º 19 (2 de mayo de 2002): 4829–42. http://dx.doi.org/10.1088/0953-8984/14/19/310.

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Isaacson, Michael. "Wave and current forces on fixed offshore structures". Canadian Journal of Civil Engineering 15, n.º 6 (1 de diciembre de 1988): 937–47. http://dx.doi.org/10.1139/l88-125.

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The Canadian Standards Association standard S471 "General requirements, design criteria, environment, and loads, Part 1 of the CSA code for the design, construction and installation of fixed offshore structures" contains an appendix "Wave and current loads." To compliment this appendix, the present paper provides a more detailed survey of this topic with a review of the recent literature and recommendations of hydrodynamic data needed in offshore design. In addition, hydrodynamic considerations in the calculation of earthquake and ice loads are mentioned. Key words: currents, current forces, hydrodynamics, ocean engineering, offshore structures, waves, wave forces.

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Jayaratne, Ravindra, Mara Nicholas, Behnaz Ghodoosipour, Sophie Mugnaini, Ioan Nistor y Tomoya Shibayama. "TSUNAMI-INDUCED HYDRODYNAMICS AND SCOUR AROUND STRUCTURES". Coastal Engineering Proceedings, n.º 36 (30 de diciembre de 2018): 5. http://dx.doi.org/10.9753/icce.v36.currents.5.

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The complex hydrodynamics during a tsunami event can significantly affect the structural integrity of buildings. The resulting hydrodynamic forces are influenced by various fluid parameters such as the fluid density, flow velocity and depth, as well as by the structureâ€™s geometry. Hydrodynamic forces induced by tsunami pressures and velocities are particularly important, as they occur usually around a coastal defence structure or a building and as a result, they affect the structural integrity of the structure (Chinnarasri et al, 2013). The 2011 Japan post-tsunami field survey of Chock et al. (2013) indicated that lateral pressures, uplift pressures and surge flow from the tsunami produced hydrodynamic forces responsible for the destruction of many structures along the Tohoku coastline. The associated hydrodynamic parameters of a tsunami such as pressures and velocities also influence the tsunami-induced scour around buildings. Nicholas et al. (2016) stated that the tsunami-induced hydrodynamic velocity was a crucial factor in producing soil-scour around building structures.

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Svoykin, A. O. "Reducing the hydrodynamic force in the hydraulic distributor by modernizing the spool coupe parts". Nauchno-tekhnicheskiy vestnik Bryanskogo gosudarstvennogo universiteta 7, n.º 4 (25 de diciembre de 2021): 356–68. http://dx.doi.org/10.22281/2413-9920-2021-07-04-356-368.

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Due to a sharp change in the direction and velocity of the fluid flow in the hydraulic distributor, hydrodynamic forces arise. When positioning and holding the spool, the magnitude of the above forces determines the required control power. The aim of the article was to find an optimal constructive solution that would reduce the influence of hydrodynamic forces. In the article we have considered the theoretical foundations laid in the analytical solution of the problem of calculating the magnitude of the hydrodynamic force acting on the plunger of the spool. In addition, a numerical experiment was carried out using CAD Solidworks and the Flow Simulation application package and a comparison of the results obtained with the analytical solution of the problem. During the numerical experiment, it was found that by upgrading the spool sleeve, it is possible to reduce the value of the hydrodynamic force by 4.5 times, compared with the original design. At the same time, it was found that the modernization of the plunger does not further reduce the maximum hydrodynamic forces. The article highlights the economic benefits of reducing the required power to control the hydraulic distributor. The article may be of interest to both researchers whose research interests lie in the field of hydrodynamics, and manufacturers of hydraulics.

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Li, Yajie y Yun Long. "Numerical Study on Wave Radiation by a Barge with Large Amplitudes and Frequencies". Journal of Marine Science and Engineering 8, n.º 12 (19 de diciembre de 2020): 1034. http://dx.doi.org/10.3390/jmse8121034.

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A two-dimensional boundary element method is used to study the hydrodynamics of a single barge with prescribed motions of large amplitudes and high frequencies. The wave radiation problem is solved in the time domain based on the fully nonlinear potential flow theory. For numerical simulations, special treatments like plunging wave cutting and remeshing approaches are presented in detail. The numerical schemes are verified through comparing with analytical results. Both the generated outgoing wave amplitudes and hydrodynamic coefficients can be calculated with sufficient accuracy. Then, we focus on large heave, sway and roll motions to investigate the nonlinear effects on hydrodynamic forces, respectively. In particular, the heave motion with two frequencies is also simulated to study the interactions between results at different frequencies. It is interesting to see the sum and difference frequency components and the envelopes in time histories as a result. For forces caused by forced sway or roll motions, there are only even-order harmonics for vertical forces and only odd-order harmonics for horizontal forces. Finally, a single body with combined sway, heave and roll motion is studied to examine the interactions between motion modes.

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Sourie, Aurélien y Nicolas Chamel. "Generalization of the Kutta–Joukowski theorem for the hydrodynamic forces acting on a quantized vortex". International Journal of Modern Physics B 34, n.º 10 (20 de abril de 2020): 2050099. http://dx.doi.org/10.1142/s021797922050099x.

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The hydrodynamic forces acting on a quantized vortex in a superfluid have long been a highly controversial issue. A new approach, originally developed in the astrophysical context of compact stars, is presented to determine these forces by considering small perturbations of the asymptotically uniform flows in the region far from the vortex in the framework of Landau–Khalatnikov two-fluid model. Focusing on the irrotational part of the flows in the Helmholtz decomposition, the classical Kutta–Joukowski theorem from ordinary hydrodynamics is thus generalized to superfluid systems. The same method is applied to predict the hydrodynamic forces acting on vortices in cold atomic condensates and superfluid mixtures.

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Verley, Richard L. P., Kostas F. Lambrakos y Knut Reed. "Hydrodynamic Forces on Seabed Pipelines". Journal of Waterway, Port, Coastal, and Ocean Engineering 115, n.º 2 (marzo de 1989): 190–204. http://dx.doi.org/10.1061/(asce)0733-950x(1989)115:2(190).

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Isaacson, Michael y John Baldwin. "Moored structures in waves and currents". Canadian Journal of Civil Engineering 23, n.º 2 (1 de abril de 1996): 418–30. http://dx.doi.org/10.1139/l96-046.

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The present paper provides a brief review of the analysis of moored floating structures in waves and currents. A hydrodynamic analysis is required in order to predict wave and current effects on floating structures, and corresponding numerical models for determining transmitted and reflected wave heights, added masses, damping coefficients, and wave exciting forces are summarized. A mooring analysis is required in conjunction with the hydrodynamic analysis in order to calculate the restraint provided by the mooring system, as well as the structure motions, mooring line and anchor loads, and mooring line configurations. Various aspects of static, dynamic, and nonlinear responses are discussed and illustrated with example applications. Key words: coastal engineering, currents, floating structures, hydrodynamics, mooring forces, ocean engineering, wave forces, waves.

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Tesis sobre el tema "Hydrodynamic Forces"

Millhouse, Scott C. "Hydrodynamic forces on composite structures". Thesis, Monterey, California: Naval Postgraduate School, 2014. http://hdl.handle.net/10945/42686.

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Approved for public release; distribution is unlimited
Using a tow tank environment an experiment was set up to measure for response of composite samples of varying stiffness to a geometrically comparable more rigid aluminum sample which was tested at increasing speeds. Also, a square composite shape was tested in a frame providing clamped boundary conditions. Testing of this sample over varying speeds was also performed at varying position angles and was analyzed for force, strain and flow visualization. Results show complex behaviors in fluid flow and structural deformation because of the effects of the free surface and fluid-structure interaction. The comparable mass density between composite plates and water results in pronounced fluid structure interaction. Proximity to the free surface highly influences the test data along with the position angle. Negative position angles in combination with high speeds result in an air pocket open to the atmosphere which translates to a sharp decrease in strain on the sample. Positive position angles yields different free surface effects including vortices and the onset of cavitation.

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Mollet, Michael A. "Physiological effects of hydrodynamic forces on animal cells". Connect to this title online, 2004. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1101175313.

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Thesis (Ph. D.)--Ohio State University, 2004.
Title from first page of PDF file. Document formatted into pages; contains xv, 145 p.; also includes graphics (some col.) Includes bibliographical references (p. 127-135).

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La, Mantia Marco. "Analysis of hydrodynamic forces on flapping wing". Thesis, Queen Mary, University of London, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.511346.

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Pan, Lei. "Surface and Hydrodynamic Forces in Wetting Films". Diss., Virginia Tech, 2013. http://hdl.handle.net/10919/51538.

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The process of froth flotation relies on using air bubbles to collect desired mineral particles dispersed in aqueous media on the surface, while leaving undesirous mineral particles behind. For a particle to be collected on the surface of a bubble, the thin liquid films (or wetting films) of water formed in between must rupture. According to the Frumkin-Derjaguin isotherm, it is necessary that wetting films can rupture when the disjoining pressures are negative. However, the negative disjoining pressures are difficult to measure due to the instability and short lifetimes of the films. In the present work, two new methods of determining negative disjoining pressures have been developed. One is to use the modified thin film pressure balance (TFPB) technique, and the other is to directly determine the interaction forces using the force apparatus for deformable surfaces (FADS) developed in the present work. The former is designed to obtain spatiotemporal profiles of unstable wetting films by recording the optical interference patterns. The kinetic information derived from the spatiotemporal profiles were then used to determine the disjoining pressures using an analytical expression derived in the present work on the basis of the Reynolds lubrication theory. The technique has been used to study the effects of surface hydrophobicity, electrolyte (Al3+ ions) concentration, and bubble size on the stability of wetting films. Further, the geometric mean combining rule has been tested to see if the disjoining pressures of the wetting films can be predicted from the disjoining pressures of the colloid films formed between two hydrophobic surfaces and the disjoining pressures of the foam films formed between two air bubbles. The FADS is capable of directly measuring the interaction forces between air bubble and solid surface, and simultaneously monitoring the bubble deformation. The results were analyzed using the Reynolds lubrication theory and the extended DLVO theory to determine both the hydrodynamic and disjoining pressures. The FADS was used to study the effects of surface hydrophobicity and approach speeds. The results show that hydrophobic force is the major driving force for the bubble-particle interactions occurring in flotation.
Ph. D.

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Adkins, Douglas Ray Brennen Christopher E. Brennen Christopher E. "Analyses of hydrodynamic forces on centrifugal pump impellers /". Diss., Pasadena, Calif. : California Institute of Technology, 1986. http://resolver.caltech.edu/CaltechETD:etd-03262007-111453.

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Sarjamee, Samieh. "Numerical Modelling of Extreme Hydrodynamic Loading on Coastal Structures". Thesis, Université d'Ottawa / University of Ottawa, 2016. http://hdl.handle.net/10393/35124.

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Natural disasters usually occur without any warning. They can leave trail of destruction and cause much tragedy. We are at a time when we witness fast technological advances; hence, we need to apply the force of scientific advancements to decrease economic losses and the number of human deaths. Tsunami is one of the extreme environmental events that leaves nothing but a path of death and destruction, and as a result, it is essential to understand this phenomenon and identify the mitigation strategies. Several mitigation strategies have been proposed so far; however, more investigations are still required to achieve an acceptable solution. Researchers around the world are studying different aspects of this phenomenon. One of the proposed solutions that has received much attention is designing tsunami-resistant structures which can withstand the force of a tsunami bore. Various studies have been done so far to understand the base shear force of tsunami bore on structures. The focus of this thesis is to improve and better understand the characteristics of the tsunami base shear forces on structures. Hence, in this thesis, two numerical studies were proposed and performed with the main goal of estimating the total tsunami forces on structure under two different conditions. Those include structures with various cross sections, as well as positioning a mitigation wall at an appropriate location relative to the structure. The first study focused on developing a numerical model to study the relationship between tsunami forces and the geometry of the structure. The main goal of this study was to define a numerical model capable of simulating this case precisely. To ensure the accuracy of the model, a comparison was carried out between the results of the numerical model and experimental test performed at the NRC-CHC (National Research Council- Canadian Hydraulics Center) laboratory in Ottawa, Canada and Université Catholique de Louvain (UCL), Belgium, which revealed a very good agreement between the results of the experimental test and numerical model. Further, the validated model was applied to investigate the tsunami force on structures with various cross sections. The second study focus was on developing a numerical model for understanding the role of mitigation wall (a novel idea proposed as a mitigation strategy by the second author of technical paper 2) on reducing the exerted force of tsunami on structures. After developing various models and applying several turbulence models, a valuable result was obtained which demonstrated that a Large Eddy Simulation (LES) model seems to be an excellent approach for predicting the tsunami forces on the structure with a mitigation wall in the direction of the flow. The results of this study will be used to better estimate the tsunami forces exerted on coastal structures which will light the path to the main goal of designing tsunami resistant-structures.

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James, Gregory Keith. "Investigation of Hydrodynamic and Depletion Interactions in Binary Colloidal Dispersions". Diss., Virginia Tech, 2013. http://hdl.handle.net/10919/24764.

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Within a colloidal dispersion, the presence of negatively adsorbing material can produce a variety of effects on the dispersion properties and interactions. With increasing concentration, the negatively adsorbing material induces both depletion and structural forces on the dispersion, which can dramatically affect both colloidal stability and near-contact hydrodynamics. This project focused on expanding our understanding of the effects of such negatively adsorbing materials on both equilibrium and dynamic interactions between particles. The effects of charged, hard spheres (silica nanoparticle) on the hydrodynamic drag force a particle experiences as it approaches a flat plate were measured experimentally using colloid probe atomic force microscopy (CP-AFM). Deviation was found between the measured drag force and predictions for the drag force in a simple, Newtonian fluid. The measured drag force was always smaller than the predicted drag force as the particle approached contact with the plate. An effective viscosity, that approached the dispersing fluid viscosity at contact and the bulk viscosity at large separations, was determined for the system. This effective viscosity displayed similar characteristics to those predicted theoretically by Bhattacharya and Blawzdziewicz (J. Chem. Phys. 2008, 128, 214704.). The effects of both anionic and cationic micelles on the depletion and structural forces in a colloidal dispersion were studied both experimentally (with CP-AFM) and theoretically. The depletion and structural forces between a microparticle and a flat plate were measured and compared with the depletion force predicted by the force-balance model of Walz and Sharma (J. Colloid Interface Sci. 1994, 168, 485-496.). Consistent with previous work, the measured depletion force for both micelles was smaller in magnitude than that predicted by the Walz and Sharma model for hard, charged spheres. It is theorized that rearrangement of the micelle surfaces charges or physical deformation of the micelles may be responsible for the observed result. An effective surface potential for the micelles is proposed as a correction to the Walz and Sharma model. Finally, the stability of colloidal dispersions was studied macroscopically in solutions of ionic micelles. The colloidal dispersions displayed clear flocculation behavior in both cationic and anionic micelles. This flocculation behavior was compared with energy profiles determined from CP-AFM experiments between a single particle and a flat plate. A simple phase diagram was proposed for predicting the stability of colloidal dispersions based solely on the depth of the depletion energy well and the height of the repulsive energy barrier.
Ph. D.

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St-Germain, Philippe. "Numerical Modeling of Tsunami-induced Hydrodynamic Forces on Free-standing Structures Using the SPH Method". Thèse, Université d'Ottawa / University of Ottawa, 2012. http://hdl.handle.net/10393/23527.

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Tsunamis are among the most terrifying and complex physical phenomena potentially affecting almost all coastal regions of the Earth. Tsunami waves propagate in the ocean over thousands of kilometres away from their generating source at considerable speeds. Among several other tsunamis that occurred during the past decade, the 2004 Indian Ocean Tsunami and the 2011 Tohoku Tsunami in Japan, considered to be the deadliest and costliest natural disasters in the history of mankind, respectively, have hit wide stretches of densely populated coastal areas. During these major events, severe destruction of inland structures resulted from the action of extreme hydrodynamic forces induced by tsunami flooding. Subsequent field surveys in which researchers from the University of Ottawa participated ultimately revealed that, in contrast to seismic forces, such hydrodynamic forces are not taken into proper consideration when designing buildings for tsunami prone areas. In view of these limitations, a novel interdisciplinary hydraulic-structural engineering research program was initiated at the University of Ottawa, in cooperation with the Canadian Hydraulic Centre of the National Research Council, to help develop guidelines for the sound design of nearshore structures located in such areas. The present study aims to simulate the physical laboratory experiments performed within the aforementioned research program using a single-phase three-dimensional weakly compressible Smoothed Particle Hydrodynamics (SPH) numerical model. These experiments consist in the violent impact of rapidly advancing tsunami-like hydraulic bores with individual slender structural elements. Such bores are emulated based on the classic dam-break problem. The quantitatively compared measurements include the time-history of the net base horizontal force and of the pressure distribution acting on columns of square and circular cross-sections, as well as flow characteristics such as bore-front velocity and water surface elevation. Good agreement was obtained. Results show that the magnitude and duration of the impulsive force at initial bore impact depend on the degree of entrapped air in the bore-front. The latter was found to increase considerably if the bed of the experimental flume is covered with a thin water layer of even just a few millimetres. In order to avoid large fluctuations in the pressure field and to obtain accurate simulations of the hydrodynamic forces, a Riemann solver-based formulation of the SPH method is utilized. However, this formulation induces excessive numerical diffusion, as sudden and large water surface deformations, such as splashing at initial bore impact, are less accurately reproduced. To investigate this particular issue, the small-scale physical experiment of Kleefsman et al. (2005) is also considered and modeled. Lastly, taking full advantage of the validated numerical model to better understand the underlying flow dynamics, the influence of the experimental test geometry and of the bed condition (i.e. dry vs. wet) is investigated. Numerical results show that when a bore propagates over a wet bed, its front is both deeper and steeper and it also has a lower velocity compared to when it propagates over a dry bed. These differences significantly affect the pressure distributions and resulting hydrodynamic forces acting on impacted structures.

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Kwok, T. W. "The calculation of second order forces acting on ships". Thesis, University of Southampton, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.277620.

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Hu, Weiwei. "Characterization of hydrodynamic forces and interfacial phenomena in cell culture processes". Columbus, Ohio : Ohio State University, 2007. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1167409370.

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Libros sobre el tema "Hydrodynamic Forces"

Cuthbert, C. M. An attempt to simulate the hydrodynamic shear forces. Manchester: UMIST, 1993.

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Eccles, Thomas John. Measurement of hydrodynamic forces and moments and flow field mapping of a model in coning motion. Springfield, Va: Available from the National Technical Information Service, 1990.

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Sarpkaya, Turgut. Wave forces on offshore structures. Cambridge: Cambridge University Press, 2010.

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Sarpkaya, Turgut. Wave forces on offshore structures. New York: Cambridge University Press, 2010.

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Moberg, Göran. Wave forces on a vertical slender cylinder. Göteborg, Sweden: Dept. of Hydraulics, Chalmers University of Technology, 1988.

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Wave forces on offshore structures. Cambridge: Cambridge University Press, 2010.

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Hsu, Ming-kuang. Random wave forces on cylinders: Report for The National Science Foundation and The Oregon State University Sea Grant Program. Corvallis, Ore: Dept. of Civil Engineering, Ocean Engineering Program, Oregon State University, 1986.

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United States. National Aeronautics and Space Administration., ed. Experimental study of unsteady hydrodynamic force matrices on whirling centrifugal pump impellers. Pasadena, Calif: California Institute of Technology, 1986.

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United States. National Aeronautics and Space Administration, ed. Experimental study of unsteady hydrodynamic force matrices on whirling centrifugal pump impellers. Pasadena, Calif: California Institute of Technology, 1986.

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American Society of Civil Engineers. Committee on Waves and Wave Forces. Task Committee on Forces on Inclined and Vertical Wall Structures., ed. Wave forces on inclined and vertical wall structures. New York: American Society of Civil Engineers, 1995.

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Capítulos de libros sobre el tema "Hydrodynamic Forces"

Chatjigeorgiou, Ioannis K. "Distributed Forces—Hydrodynamic Loads". En Synthesis Lectures on Ocean Systems Engineering, 45–70. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-24827-6_3.

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Alves, Diogo Stuani y Katia Lucchesi Cavalca. "Numerical Identification of Nonlinear Hydrodynamic Forces". En Mechanisms and Machine Science, 1–15. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-99262-4_1.

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Hwang, J. H., Y. J. Kim y S. Y. Kim. "Nonlinear Hydrodynamic Forces Due to Two-dimensional Forced Oscillation". En Nonlinear Water Waves, 231–38. Berlin, Heidelberg: Springer Berlin Heidelberg, 1988. http://dx.doi.org/10.1007/978-3-642-83331-1_26.

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Ferrari, V., S. Sutulo y C. Guedes Soares. "Spherical harmonic expansion of hydrodynamic hull forces". En Trends in Maritime Technology and Engineering Volume 1, 337–45. London: CRC Press, 2022. http://dx.doi.org/10.1201/9781003320272-37.

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Jia, Junbo. "Influence of Hydrodynamic Forces and Ice During Earthquakes". En Modern Earthquake Engineering, 361–78. Berlin, Heidelberg: Springer Berlin Heidelberg, 2016. http://dx.doi.org/10.1007/978-3-642-31854-2_10.

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Hollm, M., L. Dostal y R. Seifried. "Particle paths and hydrodynamic forces of random wind forced nonlinear ocean waves". En Sustainable Development and Innovations in Marine Technologies, 51–58. London: CRC Press, 2022. http://dx.doi.org/10.1201/9781003358961-8.

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Petersen, Øyvind Wiig, Ole Øiseth, Torodd S. Nord y Eliz-Mari Lourens. "Model-Based Estimation of Hydrodynamic Forces on the Bergsoysund Bridge". En Conference Proceedings of the Society for Experimental Mechanics Series, 217–28. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-29751-4_22.

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Matsui, T. "Second-order Hydrodynamic Forces on Moored Vessels in Random Waves". En Nonlinear Water Waves, 293–300. Berlin, Heidelberg: Springer Berlin Heidelberg, 1988. http://dx.doi.org/10.1007/978-3-642-83331-1_32.

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Hooft, J. P. y H. A. Quadvlieg. "Non-linear hydrodynamic hull forces derived from segmented model tests". En Marine Simulation and Ship Manoeuvrability, 399–409. London: Routledge, 2021. http://dx.doi.org/10.1201/9780203748077-50.

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Hollm, Marten, Leo Dostal y Robert Seifried. "Hydrodynamic Forces Acting on Cylindrical Piles Subjected to Wind-Forced Random Nonlinear Water Waves". En NODYCON Conference Proceedings Series, 95–105. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-81162-4_9.

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Actas de conferencias sobre el tema "Hydrodynamic Forces"

Teng, CoCo y J. H. Nath. "Hydrodynamic Forces on Roughened Horizontal Cylinders". En Offshore Technology Conference. Offshore Technology Conference, 1989. http://dx.doi.org/10.4043/6008-ms.

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Abdolmaleki, Kourosh. "SPH Simulation of Hydrodynamic Forces on Subsea Pipelines". En ASME 2011 30th International Conference on Ocean, Offshore and Arctic Engineering. ASMEDC, 2011. http://dx.doi.org/10.1115/omae2011-50029.

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Hydrodynamic forces on subsea pipelines are simulated using Smoothed Particle Hydrodynamics (SPH) method. The objective is to assess the suitability of this method for common sub-sea engineering problems. The standard SPH formulation is used for simulation of cases with high KC and Re numbers, where the flow becomes turbulent with laminar or partially turbulent boundary layer. The numerical model includes a pipe section with smooth surface resting on a flat bottom. The pipe is exposed to various combinations of regular waves and current. The current is modelled as a steady flow of fluid particles and the waves are represented by forced oscillations of the pipe at defined frequencies and amplitudes. The selected KC and Re numbers produces subcritical and supercritical flows, which simulate extreme load cases on pipelines. In subcritical flows, the estimated forces on the pipeline agree well with experimental data. In supercritical flows with high KC and Re values, a relatively finer particle resolution is required in order to capture multiple harmonics of oscillating lift force. In conclusion, the SPH method could satisfactorily predict hydrodynamic forces on pipelines for the cases investigated.

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Aronsen, Kristoffer H. y Carl Martin Larsen. "Hydrodynamic Coefficients for In-Line Vortex Induced Vibrations". En ASME 2007 26th International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2007. http://dx.doi.org/10.1115/omae2007-29531.

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The paper presents results from an experimental investigation of hydrodynamic forces on a cylinder under forced in-line motions. Measured forces are decomposed into added mass, driving force and average drag components. From a large set of experiments it has been possible to draw a complete map for in-line force coefficients as function of arbitrary combinations of motion amplitude and frequency. The paper presents test set-up, data processing and how the coefficients can be used in an empirical force coefficient model for calculation of in-line vibrations of slender marine structures with arbitrary damping. Such analyses are in particular important for free spanning pipelines, where damping from pipe/seafloor interaction will reduce the response amplitudes and hence also stresses and fatigue damage.

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Nallayarasu, Kasthuri y Panneer Selvam Rajamanickam. "Hydrodynamic forces on a cylinder with anode". En OCEANS 2018 MTS/IEEE Charleston. IEEE, 2018. http://dx.doi.org/10.1109/oceans.2018.8604680.

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Bokaian, A. y F. Geoola. "Hydrodynamic Forces on a Pair of Cylinders". En Offshore Technology Conference. Offshore Technology Conference, 1985. http://dx.doi.org/10.4043/5007-ms.

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Heideman, J. C. y T. Sarpkaya. "Hydrodynamic Forces on Dense Arrays of Cylinders". En Offshore Technology Conference. Offshore Technology Conference, 1985. http://dx.doi.org/10.4043/5008-ms.

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Bjørke, Ann-Sofie, Erik Damgaard Christensen, Stefan Carstensen, Kasper Pagh Petersen, Xerxes Mandviwalla, Trygve Kristiansen y Rolf Baarholm. "Study of Hydrodynamic Forces on Complex Structures". En ASME 2018 37th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/omae2018-78250.

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This paper presents a study on the interaction of structural members that can be related to a complex structure placed in a moonpool. The complex structure in the moonpool was simplified with a varying number of members. The study has been carried out as a two-dimensional numerical study with supporting physical experiments. The focus was on the forces on the individual members as well as the entire structure. Additional the flow field associated with the oscillating water column in the moonpool was also studied.

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Skelley, Stephen. "Inducer Hydrodynamic Forces in a Cavitating Environment". En ASME 2004 Heat Transfer/Fluids Engineering Summer Conference. ASMEDC, 2004. http://dx.doi.org/10.1115/ht-fed2004-56115.

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Marshall Space Flight Center has developed and demonstrated a measurement device for sensing and resolving the hydrodynamic loads on fluid machinery. The device — a derivative of the six-component wind tunnel balance — senses the forces and moments on the rotating device through a weakened shaft section instrumented with a series of strain gauges. This “rotating balance” was designed to directly measure the steady and unsteady hydrodynamic loads on an inducer, thereby defining the amplitude and frequency content associated with operating in various cavitation modes. The rotating balance was calibrated statically using a dead-weight load system in order to generate the 6 × 12 calibration matrix later used to convert measured voltages to engineering units. Structural modeling suggested that the rotating assembly first bending mode would be significantly reduced with the balance’s inclusion. This reduction in structural stiffness was later confirmed experimentally with a hammer-impact test. This effect, coupled with the relatively large damping associated with the rotating balance waterproofing material, limited the device’s bandwidth to approximately 50 Hertz. Other pre-test validations included sensing the test article rotating assembly built-in imbalance for two configurations and directly measuring the assembly mass and buoyancy while submerged under water. Both tests matched predictions and confirmed the device’s sensitivity while stationary and rotating. The rotating balance was then demonstrated in a water test of a full-scale Space Shuttle Main Engine high-pressure liquid oxygen pump inducer. Experimental data was collected a scaled operating conditions at three flow coefficients across a range of cavitation numbers for the single inducer geometry and radial clearance. Two distinct cavitation modes were observed: symmetric tip vortex cavitation and alternate-blade cavitation. Although previous experimental tests on the same inducer demonstrated two additional cavitation modes at lower inlet pressures, these conditions proved unreachable with the rotating balance installed due to the intense dynamic environment. The sensed radial load was less influenced by flow coefficient than by cavitation number or cavitation mode although the flow coefficient range was relatively narrow. Transition from symmetric tip vortex to alternate-blade cavitation corresponded to changes in both radial load magnitude and radial load orientation relative to the inducer. Sensed moments indicated that the effective load center moved downstream during this change in cavitation mode. An occurrence of “higher-order cavitation” was also detected in both the stationary pressures and the rotating balance data although the frequency of the phenomena was well above the reliable bandwidth of the rotating balance. In summary the experimental tests proved both the concept and device’s capability despite the limitations and confirmed that hydrodynamically-induced forces and moments develop in response to the unbalanced pressure field, which is, in turn, a product of the cavitation environment.

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Verley, R. L. P., K. F. Lambrakos y K. Reed. "Prediction of Hydrodynamic Forces on Seabed Pipelines". En Offshore Technology Conference. Offshore Technology Conference, 1987. http://dx.doi.org/10.4043/5503-ms.

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Mirauda, D., A. Volpe Plantamura y S. Malavasi. "Hydrodynamic forces acting on an oscillating structure". En Coastal Processes 2011. Southampton, UK: WIT Press, 2011. http://dx.doi.org/10.2495/cp110271.

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Informes sobre el tema "Hydrodynamic Forces"

Sorenson, T., M. B. Bryndum y V. Jacobsen. L51522 Hydrodynamic Forces on Pipelines. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), diciembre de 1986. http://dx.doi.org/10.55274/r0010276.

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The aim of this study was to provide hydro-dynamic force coefficients applicable for the determination of forces on pipelines resting on the sea bed when exposed to wave and current flows. This has been achieved through an extensive model test program in which the parameters important for the phenomena have been investigated within wide ranges for a number of flow conditions including irregular waves. The results of the more than 1,000 individual tests have been presented in the form of non-dimensional coefficients determined from three distinctly different types of analysis. These coefficients have been presented as functions of the governing parameters in a series of easily accessible diagrams. The report contains three parts. Part I presents the results of the model test study and the comparison of these results with other data. Part II deals with force calculations in irregular waves, including a statistically based comparison of predictions using traditional and improved force expressions. Part III presents the results of the model tests with a partially buried pipe.

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Unknown, Author. L51549 Hydrodynamic Forces on Pipeline in an Open Trench. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), enero de 1988. http://dx.doi.org/10.55274/r0010530.

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Through model tests, hydrodynamic forces experienced by a pipeline placed in an open trench and exposed to wave and current action were determined. The resultant data were analyzed and force coefficients developed.

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Author, Unknown. L51591 Hydrodynamic Forces on a Sliding Pipeline-Model Test. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), julio de 1989. http://dx.doi.org/10.55274/r0012102.

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Reports on the results of a series of model tests investigating the hydrodynamic forces acting on a pipeline which is undergoing lateral motions on the sea bed. The model test program and the results are included. The report also includes a description of the testing technique, model setup, instrumentation, and data analysis.

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Unknown, Author. PR-170-812-R01 Hydrodynamic Forces on a Sliding Pipeline - Model Tests. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), agosto de 1988. http://dx.doi.org/10.55274/r0011999.

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Tests to determine the hydrodynamic forces acting on a submarine pipeline when it becomes unstable under the influence of severe environmental loads. The study has been carried out in a scaled-down model test programmed comprising approximately 500 tests.

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Abdolmaleki, Kourosh. PR-453-134504-R04 CFD Simulation of Hydrodynamic Forces on Submarine Pipelines. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), abril de 2020. http://dx.doi.org/10.55274/r0011661.

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This document is the Final report of the Milestone 4 of the SPDA-1-3 Industry High Value Objectives project. It presents validation of the CFD models prepared for simulation of wave and current forces on subsea pipelines as well as a summary of the CFD results on singular pipelines. Although the original scope was considering simulation of small diameters pipes only, through CFD research, it was found necessary and useful to extend the scope to include larger pipes. The results of CFD simulations will be integrated with the software in the next phases of the project.

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Hong, Young S. Computation of the Hydrodynamic Forces and Moments on a Body of Revolution with and without Appendages. Fort Belvoir, VA: Defense Technical Information Center, agosto de 1991. http://dx.doi.org/10.21236/ada243033.

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Watkins, J. C. R5FORCE/MOD3s: A program to compute fluid induced forces using hydrodynamic output from the RELAP5/MOD3 code. Office of Scientific and Technical Information (OSTI), septiembre de 1990. http://dx.doi.org/10.2172/6341078.

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Inc., Kellogg Brown and Root. L51989 Submarine Pipeline On-Bottom Stability-Volume 1-Analysis and Design Guidelines. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), diciembre de 2002. http://dx.doi.org/10.55274/r0011168.

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The state-of-the-art in Pipeline stability design has been changing very rapidly recently. The physics governing on-bottom stability are much better understood now than they were eight years ago. This is due largely because of research and large scale model tests sponsored by PRCI. Analysis tools utilizing this new knowledge have been developed. These tools provide the design engineer with a rational approach for weight coating design, which he can use with confidence because the tools have been developed based on full scale and near full scale model tests. These tools represent the state-of-the-art in stability design and model the complex behavior of pipes subjected to both wave and current loads. These include; hydrodynamic forces which account for the effect of the wake (generated by flow over the pipe) washing back and forth over the pipe in oscillatory flow; and, the embedment (digging) which occurs as a pipe resting on the seabed is exposed to oscillatory loadings and small oscillatory deflections. This report has been developed as a reference handbook for use in on-bottom pipeline stability analysis and design. It consists of two volumes. Volume one is devoted to descriptions of the various aspects of the problem: the pipeline design process ocean physics, wave mechanics, hydrodynamic forces, and meteorological data determination geotechnical data collection and soil mechanics stability design procedures. Volume two describes, lists, and illustrates the analysis software. Diskettes containing the software and examples of the software are also included in Volume two. This publication was formally titled: AGA On Bottom Stability Software.

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Abdolmaleki, Kourosh. PR-453-205101-R02 On-Bottom Dynamic Simulation. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), abril de 2023. http://dx.doi.org/10.55274/r0012257.

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This report presents a number of newly added features to the OBS software relevant to the dynamic simulation of pipelines. The additions include a function to extract on-bottom wave induced velocities and hydrodynamic forces on a given length of pipeline with arbitrary distribution of the nodes; a new dynamic simulation module to perform dynamic simulations for a single pipe node; two new soil models including the Verley and Sotberg for sand as well as a custom soil model as per the approach recommended in DNV-RP-F114. The added soil models are implemented in the dynamic solver, which provide full dynamic simulation of pipelines in two dimensions.

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Michalopoulos, C. D. PR-175-420-R01 Submarine Pipeline Analysis - Theoretical Manual. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), diciembre de 1985. http://dx.doi.org/10.55274/r0012171.

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Describes the computer program SPAN which computes the nonlinear transient response of a submarine pipeline, in contact with the ocean floor, to wave and current excitation. The dynamic response of a pipeline to impact loads, such as loads from trawl gear of fishing vessels, may also be computed. In addition, thermal expansion problems for submarine pipelines may be solved using SPAN. Beam finite element theory is used for spatial discretization of the partial differential equations governing the motion of a submarine pipeline. Large-deflection, small-strain theory is employed. The formulation involves a consistent basis and added mass matrix. Quadratic drag is computed using a nonconventional approach that involves the beam shape functions. Soil-resistance loads are computed using unique pipeline-soil interaction models which take into account coupling of axial and lateral soil forces. The nonlinear governing equations are solved numerically using the Newmark Method. This manual presents the discretized equations of motion, the methods used in determining hydrodynamic and soil-resistance forces, and the solution method.

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