Bibliografie tematiche / Hydrodynamic modelling

Letteratura scientifica selezionata sul tema "Hydrodynamic modelling"

Autore: Grafiati
Pubblicato: 4 giugno 2021
Ultima modifica: 25 maggio 2024

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Articoli di riviste sul tema "Hydrodynamic modelling"

1

Korobkin, Alexander, Emilian I. Părău e Jean-Marc Vanden-Broeck. "The mathematical challenges and modelling of hydroelasticity". Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 369, n. 1947 (28 luglio 2011): 2803–12. http://dx.doi.org/10.1098/rsta.2011.0116.

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Hydroelasticity brings together hydrodynamics and elastic theories. It is concerned with deformations of elastic bodies responding to hydrodynamic excitations, which themselves depend on elastic deformation. This Theme Issue is intended to identify and to outline mathematical problems of modern hydroelasticity and to review recent developments in this area, including physically and mathematically elaborated models and the techniques used in their analysis.
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Paggi, Marco, Andrea Amicarelli e Pietro Lenarda. "SPH Modelling of Hydrodynamic Lubrication along Rough Surfaces". Lubricants 7, n. 12 (21 novembre 2019): 103. http://dx.doi.org/10.3390/lubricants7120103.

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Rough and textured surfaces are of paramount importance for lubrication, both in nature and in technology. While surface roughness relevantly influences both friction and wear, artificial surface texturing improves the performance of slider bearings as an energy efficiency action. The simulation of hydrodynamic lubrication by taking into account complex surfaces as boundaries requires the use of computational fluid dynamics (CFD) software able to predict the pressure and the velocity profile through the thickness of the fluid and at any point within the 3D domain. In the present study, a CFD–smoothed particle hydrodynamics (SPH) code is applied to simulate hydrodynamic lubrication for a linear slider bearing in the presence of a 3D rough surface, showing the capabilities of CFD–SPH in modelling such complex interaction phenomena. Numerical assessments involve the load capacity, the 3D fields of the velocity vector, and the pressure 3D field (both within the fluid domain and at the fluid–plate interface).
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Markesteijn, Anton, Sergey Karabasov, Arturs Scukins, Dmitry Nerukh, Vyacheslav Glotov e Vasily Goloviznin. "Concurrent multiscale modelling of atomistic and hydrodynamic processes in liquids". Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 372, n. 2021 (6 agosto 2014): 20130379. http://dx.doi.org/10.1098/rsta.2013.0379.

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Fluctuations of liquids at the scales where the hydrodynamic and atomistic descriptions overlap are considered. The importance of these fluctuations for atomistic motions is discussed and examples of their accurate modelling with a multi-space–time-scale fluctuating hydrodynamics scheme are provided. To resolve microscopic details of liquid systems, including biomolecular solutions, together with macroscopic fluctuations in space–time, a novel hybrid atomistic–fluctuating hydrodynamics approach is introduced. For a smooth transition between the atomistic and continuum representations, an analogy with two-phase hydrodynamics is used that leads to a strict preservation of macroscopic mass and momentum conservation laws. Examples of numerical implementation of the new hybrid approach for the multiscale simulation of liquid argon in equilibrium conditions are provided.
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Baumann, Katrin, e Hermann Freund. "Modelling and Simulation of Aerodynamic Cylindrical Bearings Using ANSYS Hydrodynamic Bearing Element Types". Vehicles 5, n. 3 (4 settembre 2023): 1118–32. http://dx.doi.org/10.3390/vehicles5030061.

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Modern power engine concepts and environmental restrictions demand oil-free lubrication of rotors, for example, by gas bearings. However, the stiffness and damping properties ruling the rotor’s dynamics are poorly documented for aerodynamic bearings and simple calculation methods are lacking. Based on the similarity between aerodynamic and hydrodynamic journal bearings, it is investigated to what extent the hydrodynamic bearing element types of the commercial FE program ANSYS are also suitable for air bearings. Within these elements, the compressibility of the gas is neglected. After verification of the ANSYS hydrodynamic element types with literature data for cylindrical hydrodynamic bearings, the stiffness and damping coefficients of a cylindrical aerodynamic bearing are calculated by using the ANSYS hydrodynamic element types. In the examined speed range, the results agree well with literature data that consider gas compressibility. Therefore, the FE elements designed for hydrodynamical journal bearings may also be used for simulating cylindrical aerodynamic bearings. The presented calculation approach provides a compact and easy-to-use method for rotordynamic simulations with cylindrical aerodynamic bearings in a single development environment.
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Trębacki, Kazimierz. "Modelling of vibrations of a liquid filled tank". Polish Maritime Research 15, n. 3 (1 ottobre 2008): 18–27. http://dx.doi.org/10.2478/v10012-007-0079-9.

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Modelling of vibrations of a liquid filled tank Kinematic excitations provoke the motion and vibrations of the construction, which in turn considerably affects hydrodynamic loads generated on the walls of liquid cargo tanks. The issues of hydrodynamics also refer to the constructions fixed to the bottom, and those half-immersed, fully immersed, and floating (drilling platforms). They mainly concern ship tanks and oceanotechnical tanks. The theoretical and numerical analysis for long an short tanks, fully or partially filled with liquid has been performed. The determined hydrodynamic loads directly refer to the strength of the tank structure, which provides opportunities for determining the constructional strength of the entire hull. Extremely severe requirements are to be met by tanks used for carrying radioactive liquids, as an extremely high safety level is to be secured on all cargo carriers used in marine and land transport.
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Stepanenko, A. A. "Practical methods of hydrodynamic modelling". Geology, Geophysics and Development of Oil and Gas Fields, n. 9 (2018): 41–45. http://dx.doi.org/10.30713/2413-5011-2018-9-41-45.

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Quarini, G., H. Innes, M. Smith e D. Wise. "Hydrodynamic Modelling of Sedimentation Tanks". Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering 210, n. 2 (giugno 1996): 83–91. http://dx.doi.org/10.1243/pime_proc_1996_210_300_02.

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Murray, J. R., M. R. Truss, S. B. Foulkes, C. A. Haswell e K. J. Manson. "Hydrodynamic Modelling of Accretion Flows". International Astronomical Union Colloquium 194 (2004): 166–68. http://dx.doi.org/10.1017/s0252921100152339.

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AbstractIn the proceedings of this, and of several recent close binary conferences, there have been several contributions describing smoothed particle hydrodynamics simulations of accretion disks. It is opposite therefore to review the numerical scheme itself with emphasis on its advantages for disk modelling, and the methods used for modelling viscous processes.
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Manas, M. M. M., e K. P. P. Pathirana. "Hydrodynamic Modelling of Puttalam Lagoon". Engineer: Journal of the Institution of Engineers, Sri Lanka 56, n. 1 (27 marzo 2023): 1. http://dx.doi.org/10.4038/engineer.v56i1.7499.

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Krutov, Anatoly, Azam Azimov, Sodiq Ruziev e Akmal Dumanov. "Modelling of turbidity distribution along channels". E3S Web of Conferences 97 (2019): 05046. http://dx.doi.org/10.1051/e3sconf/20199705046.

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The purpose of the article is to develop the required and sufficient conditions under which numerical methods can be used for engineering calculations and for scientific research of hydrodynamic processes in solving practical problems related to surveying of pollutants diffusion in water flows. The conducted studies consisted in the finding out conditions under which mathematical modelling using hydrodynamic equations allows to solve engineering problems of channel hydrodynamics and, in particular, to numerically simulate the transport of suspended particles in channels. A number of additional nature of numerical models were studied in addition to approximation and stability, such as averaging over probability and over time averaging. It was noted that only stationary processes could be described by equations if they are obtained from the Reynolds equations, i.e. when using the Reynolds equations, an important class of problems with a pulsating flow under constant boundary conditions is excluded from consideration. And, if the equations are obtained directly from the conservation laws, then all the desired variables have the meaning of actual quantities averaged over the scale. That is even in the case of statistically stationary flows, using such equations, it is possible to solve nonstationary problems on large time scales.
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Tesi sul tema "Hydrodynamic modelling"

1

Brajdic-Mitidieri, Petra. "Advanced modelling of hydrodynamic lubrication". Thesis, Imperial College London, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.428482.

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Fowell, Mark Thomas. "Hydrodynamic Modelling of Textured Bearings". Thesis, Imperial College London, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.519607.

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Alaei, Ebrahim. "Hydrodynamic-plastic modelling of sand". Thesis, The University of Sydney, 2021. https://hdl.handle.net/2123/25046.

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This thesis focuses on proposing a novel comprehensively predictive modelling framework for granular materials which builds on the hydrodynamic procedure to satisfy the principles of thermodynamics, mass, momentum and energy conservations. In developing our physical arguments we recognise that complexity of the macroscopic mechanical response of granular media is mainly a result of kinematic degrees of freedom in granular scale. We therefore employ the original concept of two-stage irreversibility by Jiang and Liu (2009) and consider an energy sink from the mesoscopic granular entropy level to the microscopic thermal entropy level. In stark contrast from previous hydrodynamic formulations for granular materials, we establish a clear passage from the granular temperature to calibrate instead our model based on the measurable kinetic pressure. We introduce a novel coupling between the hydrodynamic formulation and plasticity theory by directly defining the evolution equations for state variables and imposing restrictions to ensure the non-negativity of the mechanical dissipation. Within our hydrodynamic-plastic framework, we construct two constitutive model variants. The first simpler model demonstrates remarkable capability to predict comprehensive rate-independent and rate-dependent phenomena, all while relying on only five previously defined mechanical constants. We enhanced the first model to capture particle breakage effects through integration with the breakage mechanics theory (Einav 2007). This more advanced model readily maintains all the rate-independent capabilities of the first one, and demonstrates remarkable agreement with elaborated experimental breakage data from monotonic and cyclic compression and shear tests. This thesis provides a foundation to explore and further model granular materials, as well as materials with complex internal heterogeneous mesoscopic structure, such as weakly cemented granular rocks, silts and clays.
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Ruziwa, Walter Rutendo. "Hydrodynamic modelling of pleated cartridge filters". Thesis, Loughborough University, 2004. https://dspace.lboro.ac.uk/2134/35607.

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The primary aim of this study is to develop and validate a hydrodynamic model for the design of pleated cartridge filters. This software package is intended to develop into a cost effective, robust and reliable design tool to enable engineers to appraise the operation of a filter. Mathematical theories are still being developed in order to build sound software for coupled flows in geometrically complicated domains. This is mainly due to the little understanding of the mathematical theories in addressing interfacial constraints in coupled flows. A 2-D computer code has been developed to simulate both Newtonian and non-Newtonian flows in the filter. The model is based on a flow model described by the Stokes, Continuity and Darcy equations. These equations are solved by the weighted residuals finite element method. Two U-V-P schemes based on the Lagrange and Taylor-Hood elements are developed and tested on various coupled flow physical problems with the latter scheme proving to be capable of coping with complex geometries. The limitations of the Lagrange scheme are described.
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Manica, Rogério. "Modelling hydrodynamic interactions between deformable droplets /". Connect to thesis, 2007. http://eprints.unimelb.edu.au/archive/00003700.

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Allen, Leanne. "Modelling dolphin hydrodynamics : the numerical analysis and hydrodynamic stability of flow past compliant surfaces". Thesis, University of Surrey, 2001. http://epubs.surrey.ac.uk/844005/.

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Historical numerical methods for solving stiff ordinary differential equations are investigated and a new numerical framework developed and applied to a variety of hydrodynamic stability problems where the effects of passive wall compliance are investigated. The compound matrix method is set in a general coordinate free framework using exterior algebra, and is considered to be the most accurate and easy to implement method for complex systems. The effect of passive wall compliance on the Blasius boundary layer flow is studied. The linear stability of the mean flow state is considered using the new numerical framework and shooting technique. A Newton algorithm is implemented to converge the eigenvalue such that the boundary condition at the surface is satisfied. Curves of neutral stability are produced in the Re-alpha plane for various degrees of compliance, damping and tension parameters. Three dimensionality is incorporated first by a simple introduction of rotation in the flow leading to the investigation of the Ekman boundary layer problem where a Coriolis force instability mechanism (type-2) produces streamwise rolls at modest Reynolds numbers. The linear stability of the Ekman mean flow state is considered using an extension of the new numerical framework for use on the vector space Lambda(3)(C6). Curves of neutral stability are produced in the E-gamma plane for constant values of the Reynolds number and in the Re-gamma plane for a selection of constant angle of orientation, E. This work is extended to consider the effects of wall compliance on the type-2 viscous instability mechanism, with the type-1 mode of instability briefly discussed. Three-dimensionality is then used for a direct application to the dolphin. The stability of the attachment-line boundary layer is investigated on flows past swept wings, relating directly to the dolphins swept-back fins. Wall compliance, modelling the dolphins skin, is included for analysis of its effect on the attachment-line instability.
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Haq, Rafiq Ul. "The hydrodynamic modelling of an evolving sea". Thesis, London Metropolitan University, 1985. http://repository.londonmet.ac.uk/3318/.

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A model of a changing tidal regime in an evolving shallow sea such as the ancient North Sea is developed and solved analytically as a generalization of Taylor's problem. Characteristic scales and coefficients are treated as functions of historical time. The z dependency, dissipative and non-linear terms are effectively separated from the governing equations by the use of a Latta expansion. A composite solution is found which takes account of each of these features. A Green's function technique is used to calculate the effects of friction. A sloping bed topography is simulated by a horizontally varying eddy viscosity.
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van, 't Hoff J. "Hydrodynamic modelling of the Oscillating Wave Surge Converter". Thesis, Queen's University Belfast, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.517034.

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Engström, Jens. "Hydrodynamic Modelling for a Point Absorbing Wave Energy Converter". Doctoral thesis, Uppsala universitet, Elektricitetslära, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-160319.

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Surface gravity waves in the world’s oceans contain a renewable source of free power on the order of terawatts that has to this date not been commercially utilized. The division of Electricity at Uppsala University is developing a technology to harvest this energy. The technology is a point absorber type wave energy converter based on a direct-driven linear generator placed on the sea bed connected via a line to a buoy on the surface. The work in this thesis is focused mainly on the energy transport of ocean waves and on increasing the transfer of energy from the waves to the generator and load. Potential linear wave theory is used to describe the ocean waves and to derive the hydrodynamic forces that are exerted on the buoy. Expressions for the energy transport in polychromatic waves travelling over waters of finite depth are derived and extracted from measured time series of wave elevation collected at the Lysekil test site. The results are compared to existing solutions that uses the simpler deep water approximation. A Two-Body system wave energy converter model tuned to resonance in Swedish west coast sea states is developed based on the Lysekil project concept. The first indicative results are derived by using a linear resistive load. The concept is further extended by a coupled hydrodynamic and electromagnetic model with two more realistic non-linear load conditions. Results show that the use of the deep water approximation gives a too low energy transport in the time averaged as well as in the total instantaneous energy transport. Around the resonance frequency, a Two-Body System gives a power capture ratio of up to 80 percent. For more energetic sea states the power capture ratio decreases rapidly, indicating a smoother power output. The currents in the generator when using the Two-Body system is shown to be more evenly distributed compared to the conventional system, indicating a better utilization of the electrical equipment. Although the resonant nature of the system makes it sensitive to the shape of the wave spectrum, results indicate a threefold increase in annual power production compared to the conventional system.
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Crooks, David Joel. "Nonlinear hydrodynamic modelling of an oscillating wave surge converter". Thesis, Queen's University Belfast, 2017. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.725744.

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This study develops further the conceptual model of Oscillating Wave Surge Converter (OWSC) hydrodynamics and improves the representation of hydrodynamic torques in the device's nonlinear time domain numerical model. Wave excitation torque tests were used to evaluate how the wave excitation torque experienced by a static OWSC varies with wave period and amplitude for a range of OWSC pitch angles. Forced oscillation tests were used to evaluate how the radiation torque experienced by an OWSC, due to its motion through still water, varies with oscillation period, oscillation amplitude and angular velocity. A third set of experiments, in which the restoring moment of buoyancy was augmented with mechanical springs, referred to as buoyancy simulation tests, demonstrated how modifications to the static torque of the system influences OWSC motion, The experiments validated and identified the limits of linear hydrodynamic coefficients obtained using Boundary Element Method (BEM) codes. Numerical methods were evaluated on their ability to improve the representation of the measured torques not estimated by the BEM codes. The wave excitation and buoyancy simulation tests were performed in 4.5m and 16m wide wave tanks at Queen's University Belfast (QUB). This presented the unique opportunity to observe how wave tank characteristics can influence experimental measurements. The buoyancy simulation tests also calibrated and validated an enhanced nonlinear time domain numerical model. The enhanced nonlinear time domain numerical model contained the numerical methods that were found to improve the estimates of the wave excitation and radiation torques measured during the wave excitation torque and buoyancy simulation tests. The enhanced nonlinear time domain numerical model contained a pitch angle dependent wave excitation torque, a nonlinear state-space approach to modelling radiation torque, an empirically developed drag torque term and an analytically derived nonlinear hydrostatic torque.
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Libri sul tema "Hydrodynamic modelling"

1

Yoshizawa, Akira. Hydrodynamic and magnetohydrodynamic turbulent flows: Modelling and statistical theory. Dordrecht: Kluwer Academic, 1998.

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Hydrodynamic and Magnetohydrodynamic Turbulent Flows: Modelling and Statistical Theory. Dordrecht: Springer Netherlands, 1998.

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1953-, Tsanis Ioannis K., a cura di. Environmental hydraulics: Hydrodynamic and pollutant transport modelling of lakes and coastal waters. Amsterdam: Elsevier, 2007.

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Los, Hans. Eco-hydrodynamic modelling of primary production in coastal waters and lakes using BLOOM. Amsterdam: IOS Press, 2009.

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Stochastic modelling of river morphodynamics. Delft: DUP Science, 2005.

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Modelling of intakes, cavitation, and pressure surges: A bibliography of modelling processes involved in intakes, inlets, outlets, cavitation, and pressure surge phenomena. Cranfield, Bedford: BHRA (Information Services), Fluid Engineering Centre, 1989.

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1930-, Noye John, e Workshop on Numerical Modelling of Marine Systems (1986 : University of Adelaide), a cura di. Numerical modelling: Applications to marine systems. Amsterdam: North-Holland, 1987.

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Hussey, Michael T. Numerical modelling of cohesive sediment transport. Dublin: University College Dublin, 1996.

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Hervouet, Jean-Michel. Hydrodynamics of free surface flows: Modelling with the finite element method. Chichester, UK: John Wiley & Sons, 2006.

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Jin, X. Y. Quasi-three-dimensional numerical modelling of flow and dispersion in shallow water. [Delft, Netherlands]: Faculty of Civil Engineering, Delft University of Technology, 1993.

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Capitoli di libri sul tema "Hydrodynamic modelling"

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Bruner de Miranda, Luiz, Fernando Pinheiro Andutta, Björn Kjerfve e Belmiro Mendes de Castro Filho. "Numerical Hydrodynamic Modelling". In Fundamentals of Estuarine Physical Oceanography, 439–80. Singapore: Springer Singapore, 2017. http://dx.doi.org/10.1007/978-981-10-3041-3_12.

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Jaschke, Peter, e Heinz Waller. "Different Techniques of the Modelling of Hydrodynamic Couplings". In Process Modelling, 329–47. Berlin, Heidelberg: Springer Berlin Heidelberg, 1999. http://dx.doi.org/10.1007/978-3-642-60120-0_22.

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Ganoulis, J. G. "Hydrodynamic Dispersion in Model Porous Media". In Groundwater Flow and Quality Modelling, 215–26. Dordrecht: Springer Netherlands, 1988. http://dx.doi.org/10.1007/978-94-009-2889-3_14.

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Pawlowski, Jacek S. "Hydrodynamic modelling for ship manoeuvring simulation". In Marine Simulation and Ship Manoeuvrability, 625–34. London: Routledge, 2021. http://dx.doi.org/10.1201/9780203748077-71.

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Palermo, Stefania Anna, Jonatan Zischg, Robert Sitzenfrei, Wolfgang Rauch e Patrizia Piro. "Parameter Sensitivity of a Microscale Hydrodynamic Model". In New Trends in Urban Drainage Modelling, 982–87. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-99867-1_169.

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Shaw, T. L. "Hydrodynamic modelling for a tidal power project". In Dynamics and Exchanges in Estuaries and the Coastal Zone, 631–47. Washington, D. C.: American Geophysical Union, 1992. http://dx.doi.org/10.1029/ce040p0631.

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Prusov, Vitaliy A., e Anatoliy Y. Doroshenko. "Hydrodynamic Modeling of Industrial Pollutants Spreading in Atmosphere". In Mathematical Problems in Meteorological Modelling, 87–116. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-40157-7_6.

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Caflisch, Russel E. "Stochastic Modelling of a Dilute Fluid-Particle Suspension". In Hydrodynamic Behavior and Interacting Particle Systems, 1–12. New York, NY: Springer US, 1987. http://dx.doi.org/10.1007/978-1-4684-6347-7_1.

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Barthel, V., e E. R. Funke. "Hybrid Modelling as Applied to Hydrodynamic Research and Testing". In Recent Advances in Hydraulic Physical Modelling, 303–90. Dordrecht: Springer Netherlands, 1989. http://dx.doi.org/10.1007/978-94-009-2344-7_7.

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Ramos, C. Matias. "Models for Study of the Hydrodynamic Actions on Hydraulic Structures". In Recent Advances in Hydraulic Physical Modelling, 143–89. Dordrecht: Springer Netherlands, 1989. http://dx.doi.org/10.1007/978-94-009-2344-7_4.

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Atti di convegni sul tema "Hydrodynamic modelling"

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Pontes, J., N. Mangiavacchi, G. Rabello dos Anjos, O. E. Barcia, O. R. Mattos, B. Tribollet e Michail D. Todorov. "Modelling Hydrodynamic Stability in Electrochemical Cells". In APPLICATIONS OF MATHEMATICS IN ENGINEERING AND ECONOMICS: Proceedings of the 34th Conference on Applications of Mathematics in Engineering and Economics (AMEE '08). AIP, 2008. http://dx.doi.org/10.1063/1.3030780.

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O'Connor, B. A., S. Pan, M. Heron, J. Williams, G. Voulgaris e A. Silva. "Hydrodynamic Modelling of a Dynamic Inlet". In 27th International Conference on Coastal Engineering (ICCE). Reston, VA: American Society of Civil Engineers, 2001. http://dx.doi.org/10.1061/40549(276)270.

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Andrew, R. N., P. W. Bull e S. L. Smith. "Hydrodynamic Modelling of Towed Array Sonars". In Warship 87 - Anti-submarine Warfare. RINA, 1987. http://dx.doi.org/10.3940/rina.warship.1987.09.

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Garcia-Rosa, Paula B., Ronan Costello, Frederic Dias e John V. Ringwood. "Hydrodynamic Modelling Competition: Overview and Approaches". In ASME 2015 34th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/omae2015-42182.

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This work describes the overall aspects of the Competition on Hydrodynamic Modelling of a Rigid Body, a competition outlined to evaluate different ways to model and simulate the motions of a rigid body in waves. The main objective is to determine a hydrodynamic model for a submerged horizontal cylinder which best predicts a recorded motion to a specific excitation in panchromatic waves. A blind study was performed by the competition participants, i.e., the simulation results were obtained without knowledge of the actual recorded motion of the cylinder. Only the geometry of the cylinder in solid model and the time series of the incoming waves were issued to the participants. The proposed approaches by the participants for modelling the rigid body and the fluid motions are based on the boundary-integral equation methods (potential flow theory) with additional viscous damping forces, where the drag terms are calculated either empirically or via the Navier-Stokes equation method. This paper describes the details about rationale for choice of the rigid body, the experimental tests, the competition criteria and an overview of all modelling approaches proposed by the competition participants.
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WILLIAMSEN, JOEL, e JOHN TIPTON. "Freedom Station wall design using hydrodynamic modelling". In Space Programs and Technologies Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1990. http://dx.doi.org/10.2514/6.1990-3664.

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Kaasen, Karl E. "Consistent State Space Modelling of Hydrodynamic Memory". In ASME 2020 39th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/omae2020-19194.

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Abstract The conventional way to model hydrodynamic memory or radiation force is to use retardation functions. These functions are usually derived from frequency-dependent damping functions that are calculated by a diffraction-radiation code using potential theory. Calculating the retardation functions can be challenging due to lack of information at high frequency. In simulation of wave-driven vessel motion the retardation function is convolved with the velocity to give the wave radiation force, which is time-consuming. The paper describes how the memory effects can be modelled consistently by linear differential equations, such that coupled modes of motion share one set of poles. The coefficients of the differential equations are found by least squares fitting of a certain rational function to the numerical damping function. One advantage of this is that no assumption need to be made about the added mass at infinite frequency. Nor is any conditioning of the given data necessary. Using the fitted model in time-domain simulation is much quicker than using retardation functions. The method is applied to data representing the sway, roll and yaw motions of an FPSO of 238 m length. It was found that a sixth-order differential equation model fitted the given numeric radiation function well. It is shown how the high frequency asymptote for added mass can be estimated with high accuracy, which is valuable when it is not known in advance.
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7

Zhang, De-Qing, Jun-Feng Du, Zhi-Ming Yuan, Ming Zhang e Feng-Shen Zhu. "Hydrodynamic Modelling of Modularized Floating Photovoltaics Arrays". In ASME 2023 42nd International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2023. http://dx.doi.org/10.1115/omae2023-102530.

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Abstract Large arrays of floating photovoltaics (FPV) are emerging to be an attractive solution to renewable energy production and ocean space utilization. FPV arrays are typically buoyed by hundreds of modularized floating bases arranged in ocean surface. The total performance of the FPV arrays is significantly affected by the hydrodynamic interactions between these individual floaters. As the size of the array increases, more time will be required to calculate the entire hydrodynamic properties. From the engineering point of view, it is a challenging task to fully consider the radiation interactions among the modularized FPV floaters. In fact, when the distance between two floating bodies is large enough, their interaction will gradually vanish. The present study developed a cut-off scheme to improve the computational efficiency while providing a reliable prediction of the interaction effects in engineering practice. A cut-off radius is introduced in this scheme to determine the coupling range in which the radiation hydrodynamic interactions should be considered. The cut-off radius is determined by three parameters, including the modular shape, wave frequency and accuracy requirement. Several arrays of rectangular FPV bases were taken as examples to show how to quantify the radiation interactions and find an optimal cut-off radius. The effect of wave direction, gap distance, and connection type were also investigated. The results from the validation case showed that the hydrodynamic interaction can be well predicted using the proposed cut-off scheme, while more than half of the computational time can be saved.
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8

"A hydrodynamic-ecological model for Lake Rerewhakaaitu". In 21st International Congress on Modelling and Simulation (MODSIM2015). Modelling and Simulation Society of Australia and New Zealand, 2015. http://dx.doi.org/10.36334/modsim.2015.b7.parshotam.

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Podhoranyi, Michal. "MODELLING LARGE - SCALE HYDRODYNAMIC MODEL USING HEC-RAS". In 14th SGEM GeoConference on WATER RESOURCES. FOREST, MARINE AND OCEAN ECOSYSTEMS. Stef92 Technology, 2014. http://dx.doi.org/10.5593/sgem2014/b31/s12.062.

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Griffiths, Terry, Randall Griggs e Mehdi Khiadani. "CFD Modelling of Flexible Concrete Mattress Hydrodynamic Forces". In ASME 2022 41st International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/omae2022-78728.

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Abstract While flexible concrete mattresses have been used extensively in the offshore industry for many decades, relatively little peer-reviewed published data exists to define the hydrodynamic forces and failure modes of these structures. This paper presents a series of 3D CFD models which provide the predicted hydrodynamic force coefficients for a typical subsea bidirectionally-flexible concrete mattress. In addition, the CFD models also provide insight into the flow dynamics between and within the concrete blocks, allowing an understanding of the relative hydrodynamic forces on each block. The model results provide useful insight when interpreted in conjunction with physical model tests and field data to provide the potential for new design guidance to be developed.
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Rapporti di organizzazioni sul tema "Hydrodynamic modelling"

1

Li, Z., G. Chi, K. M. Bethune, S. A. Bosman e C D Card. Geometric and hydrodynamic modelling and fluid-structural relationships in the southeastern Athabasca Basin and significance for uranium mineralization. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2015. http://dx.doi.org/10.4095/295788.

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Li, Z., G. Chi, K. M. Bethune, S. A. Bosman e C D Card. Geometric and hydrodynamic modelling and fluid-structural relationships in the southeastern Athabasca Basin and significance for uranium mineralization. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2015. http://dx.doi.org/10.4095/296523.

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