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Articoli di riviste sul tema "Hydrodynamic modelling"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 25 maggio 2024

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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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5

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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6

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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7

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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8

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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9

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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10

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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11

Vega, G. P., M. R. Peña, C. Ramírez e D. D. Mara. "Application of CFD modelling to study the hydrodynamics of various anaerobic pond configurations". Water Science and Technology 48, n. 2 (1 luglio 2003): 163–71. http://dx.doi.org/10.2166/wst.2003.0111.

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The simulation of hydrodynamics and transport phenomena in waste stabilization ponds is a developing tool worth studying in order to understand their internal processes and interactions. Pond design involves several physical, hydrological, geometric and dynamic variables so as to provide high hydrodynamic efficiency and maximum substrate utilization rates. CFD modelling allows the combination of these factors to predict the behaviour of ponds having different configurations. The two-dimensional depth-integrated model MIKE 21 was used in this study to simulate hydrodynamic and advection-dispersion processes in a full-scale anaerobic pond (AP) located in southwest Colombia. A set of 12 configurations including sludge contents, inlet-outlet positioning, baffling and pond geometry were modelled. Results showed that a crosswise (diagonally opposite) inlet-outlet layout, a length-to-breadth ratio of 2:1, plus provision of two cross baffles at 1/3 L and 2/3 L were the most effective measures to improve overall AP hydrodynamics and dispersion patterns.

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Vaes, G., e J. Berlamont. "Modelling of overflow emissions in flanders". Water Science and Technology 38, n. 10 (1 novembre 1998): 41–48. http://dx.doi.org/10.2166/wst.1998.0373.

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Ideally, for emission calculations long term hydrodynamic simulations should be performed, but this requires long calculation times. Simplifications are consequently necessary. Due to the non-linear behaviour of sewer systems, hydrodynamic simulations using single storm events often will not lead to a good probability estimation of the overflow emissions. Simplified models using long time simulations give better results if they are well calibrated. To increase the accuracy hydrodynamic simulations with short time series can be used. The short time series are selected from the long time historical rainfall series using a simplified model. To test the accuracy of these three methods, hydrodynamic long term simulations were performed for several (small) sewer systems with different characteristics to compare with.

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13

Gavassino, Lorenzo, Marco Antonelli e Brynmor Haskell. "Multifluid Modelling of Relativistic Radiation Hydrodynamics". Symmetry 12, n. 9 (18 settembre 2020): 1543. http://dx.doi.org/10.3390/sym12091543.

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The formulation of a universal theory for bulk viscosity and heat conduction represents a theoretical challenge for our understanding of relativistic fluid dynamics. Recently, it was shown that the multifluid variational approach championed by Carter and collaborators has the potential to be a general and natural framework to derive (hyperbolic) hydrodynamic equations for relativistic dissipative systems. Furthermore, it also allows keeping direct contact with non-equilibrium thermodynamics, providing a clear microscopic interpretation of the elements of the theory. To provide an example of its universal applicability, in this paper we derive the fundamental equations of the radiation hydrodynamics directly in the context of Carter’s multifluid theory. This operation unveils a novel set of thermodynamic constraints that must be respected by any microscopic model. Then, we prove that the radiation hydrodynamics becomes a multifluid model for bulk viscosity or heat conduction in some appropriate physical limits.

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14

O'Neill, F. G., e A. Ivanović. "The physical impact of towed demersal fishing gears on soft sediments". ICES Journal of Marine Science 73, suppl_1 (18 agosto 2015): i5—i14. http://dx.doi.org/10.1093/icesjms/fsv125.

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Abstract An improved understanding of the physical interaction of towed demersal fishing gears with the seabed has been developed in recent years, and there is a clearer view of the underpinning mechanical processes that lead to the modification and alteration of the benthic environment. The physical impact of these gears on soft sediments can be classified broadly as being either geotechnical or hydrodynamic in nature: penetration and piercing of the substrate, lateral displacement of sediment, and the influence of the pressure field transmitted through the sediment can be considered geotechnical, whereas the mobilization of sediment into the water column can be considered hydrodynamic. A number of experimental and numerical approaches have been used to gain better insights of these physical processes. These include small-scale modelling in towing tanks and sand channels; large-scale modelling in the field; measurements behind full-scale towed gears at sea; numerical/mathematical modelling of sediment mechanics; and numerical/mathematical modelling of hydrodynamics. Here, we will review this research, and that in associated fields, and show how it can form the basis of predictive models of the benthic impact of trawl gears.

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15

PERCHUK, L. L., Y. YU PODLADCHIKOV e A. N. POLYAKOV. "Hydrodynamic modelling of some metamorphic processes". Journal of Metamorphic Geology 10, n. 3 (maggio 1992): 311–19. http://dx.doi.org/10.1111/j.1525-1314.1992.tb00086.x.

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16

Liu, Yongzhi, Wenting Zhang e Xinmin Cui. "Flood Emergency Management Using Hydrodynamic Modelling". Procedia Engineering 28 (2012): 750–53. http://dx.doi.org/10.1016/j.proeng.2012.01.802.

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17

Ali, Imran, Andrew Ragai Henry Rigit, Omar Bin Yaakob, Jane Labadin e Altaf Hussain Rajpar. "Tidal energy assessment with hydrodynamic modelling". Indonesian Journal of Electrical Engineering and Computer Science 29, n. 2 (1 febbraio 2023): 1201. http://dx.doi.org/10.11591/ijeecs.v29.i2.pp1201-1212.

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<span lang="EN-US">The increasing demand for sustainable energy generation brings a need for tidal current energy resource exploration around the globe. Hydrodynamic modelling is an essential aspect to explore macro tidal sites. In the current research paper, a 2D hydrodynamic model is set up by utilizing the numerical application of Delft3D. The model is validated against the database results and the two macro tidal sites are identified along the coastline of Sarawak, Malaysia. The maximum available kinetic energy flux at the identified location is 0.6 kW/m2, during peak neap tide hours. This stands as a sound justification to have a detailed tidal energy assessment study in this area in future research.</span>

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18

Niewland, J. J., P. Huizenga, J. A. M. Kuipers e W. P. M. van Swaaij. "Hydrodynamic modelling of circulating fluidised beds". Chemical Engineering Science 49, n. 24 (dicembre 1994): 5803–11. http://dx.doi.org/10.1016/0009-2509(94)00350-5.

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19

Lenhart, Hermann-J., e Thomas Pohlmann. "North Sea hydrodynamic modelling: a review". Senckenbergiana maritima 34, n. 1-2 (maggio 2004): 53–88. http://dx.doi.org/10.1007/bf03043229.

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20

Alba, Javier García, Aina G. Gómez, Pilar del Barrio Fernández, Andrés García Gómez e César Álvarez Díaz. "Hydrodynamic modelling of a regulated Mediterranean coastal lagoon, the Albufera of Valencia (Spain)". Journal of Hydroinformatics 16, n. 5 (22 febbraio 2014): 1062–76. http://dx.doi.org/10.2166/hydro.2014.071.

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Coastal lagoon hydrodynamics are strongly influenced by sea water exchange, especially when the connection between the lagoon and the sea is artificially regulated. These situations increase the complexity of the hydrodynamic regime, requiring the use of numerical models to understand their behaviour. Traditionally, one-dimensional models have been used, although in recent years, the development of two-dimensional shallow water models and advanced numerical techniques have increased notably. However, most of the existing bi-dimensional models consider the connection to the sea as a boundary condition, and they do not take into consideration the sea-lagoon exchange. In this paper, a fully two-dimensional hydrodynamic model of a heavily regulated coastal lagoon, which includes the artificial connection with the sea, is presented. The model allows the characterization of water level variation in the lagoon, taking into account the combined effect of different forcings. This model consists of two hydrodynamic modules: a long wave module (two-dimensional depth-averaged) which includes the analysis of a system of sluice gates, and a wind module (quasi three-dimensional). The model was successfully calibrated and validated with real data, showing its ability to accurately describe the hydraulic dynamics of regulated coastal lagoons.

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21

Ostrowski, Rafał. "On Uncertainties in Determination of Sediment Transport Rates in Coastal Regions". Archives of Hydro-Engineering and Environmental Mechanics 63, n. 4 (1 dicembre 2016): 265–80. http://dx.doi.org/10.1515/heem-2016-0017.

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Abstract The paper deals with research uncertainties, difficulties, inaccuracies and unreliabilities related to the modelling of physical phenomena involving coastal lithodynamics. The considerations are focused on processes of wave transformation, wave-driven currents and sediment transport itself. It is shown that possible inaccuracies at individual stages of the modelling of coastal hydrodynamics can lead to serious uncertainties with respect to the ultimate modelling output, namely bed shear stresses and sediment transport rates. These inaccuracies result mostly from arbitrarily assumed parameters and constants. Other modelling biases discussed in the paper comprise simplifications and approximations with respect to sediment resources and size-graded properties, randomness of hydrodynamic impacts, bottom roughness and land-borne factors involved in coastal lithodynamics.

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22

Ramsankaran, Raaj, Christian Maerker e Andreas Malcherek. "Numerical modelling of hydrodynamics and sediment transport processes during storm events in a non-perennial river". Journal of Hydrology and Hydromechanics 58, n. 1 (1 marzo 2010): 36–48. http://dx.doi.org/10.2478/v10098-010-0005-1.

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Numerical modelling of hydrodynamics and sediment transport processes during storm events in a non-perennial riverThis article presents the numerical modelling of hydrodynamics and sediment transport processes in the seasonal Pathri Rao River, which flows in the Northern part of India. Modelling is made by the coupled application of the hydrodynamic model called TELEMAC-2D and the morphodynamic model called SediMorph. The hydrodynamic model results are validated with the observed data and it has been found that the present model provides reasonable predictions. Likewise, the validation of the morphodynamic model is also presented. For this purpose, the suspended and bed load transport modules are validated separately for four runoff events observed during the investigations. The validation of the former is approached by comparing the depth-averaged suspended transport concentrations against experimental measurements made at the make-shift gauging station and subsequent comparison against experimental measurements. On the other hand, due to non-availability of the observed values on bed load sediment transport, the bed load sediment transport and bed evolution numerical results could not be validated quantitatively and was approached only on qualitative basis. In general, both validations present an acceptable agreement with measurements and scientific facts. Further, this study demonstrates that the coupled TELEMAC-2D/SediMorph system could be used with confidence for practical applications in the Pathri Rao River.

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Li, Qian, Yu Cao, Boyang Li, David M. Ingram e Aristides Kiprakis. "Numerical Modelling and Experimental Testing of the Hydrodynamic Characteristics for an Open-Frame Remotely Operated Vehicle". Journal of Marine Science and Engineering 8, n. 9 (7 settembre 2020): 688. http://dx.doi.org/10.3390/jmse8090688.

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The remotely operated vehicles (ROVs) are important to provide the technology support for both the traditional offshore structures and rapidly-growing renewable energy facilities during their full-lifecycles, such as site survey, installation, inspection, maintenance and repair. Regarding the motion and performance of a ROV, the understanding of its hydrodynamic properties is essential when exposing to the disturbances of wave and current. In this study, a numerical model is proposed within the frame of an open-source platform OpenFOAM. The hydrodynamics of the adopted ROV (BlueRov2) in its four principal degrees of freedoms (DOFs) is numerically simulated by a Reynolds-Averaged Navier-Stokes (RANS) solver. Meanwhile, an experimental test is carried out by using a novel technique on measuring the hydrodynamic forces and moments. To validate the numerical prediction methodologies, a set of systematic simulations of the ROV subjected to the disturbances caused by various flow conditions are performed. Comparing to the model test measurement, the numerical model proved to be reliable in offering a good estimation of the hydrodynamic parameters. This also indicates that the presented numerical methodologies and experimental techniques can be applied to other types of open-frame ROVs in quantifying the hydrodynamic parameters, capturing the physics of the fluid-structure interaction (FSI) and feature of the turbulent vorticity which are all essential for the effective control of the ROVs under the nonlinear flow disturbances.

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Gong, Kai, Benlong Wang e Hua Liu. "MODELLING WATER ENTRY OF A WEDGE BY MULTIPHASE SPH METHOD". Coastal Engineering Proceedings 1, n. 32 (23 gennaio 2011): 10. http://dx.doi.org/10.9753/icce.v32.waves.10.

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The hydrodynamic problem of two-dimensional wedge entering water is studied based on SPH model. A non-reflection boundary treatment for SPH method is proposed to reduce the size of computational domain. The details of water entry and enclosing are simulated using two phase SPH model. Both the water flow around the cavity and wedge and air flow inside the cavity are predicted simultaneity. Good agreement is obtained comparing experimental data in terms of both the hydrodynamics force exerting on the wedge and geometry of the cavity and jet.

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Ouyang, Zhenyu, e Boo Cheong Khoo. "Two-Phase Smoothed Particle Hydrodynamics Modelling of Hydrodynamic-Aerodynamic and Wave-Structure Interaction". Energies 15, n. 9 (28 aprile 2022): 3251. http://dx.doi.org/10.3390/en15093251.

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A two-phase (air and water) smoothed particle hydrodynamics (SPH) method is employed to study the hydrodynamic-aerodynamic and wave interaction with fixed and floating structures in a wave basin. The method is first verified for a classical two-phase dam-breaking. A mirror-open boundary is implemented at the top and left sides of a two-phase wave basin with a piston to generate a second-order regular wave. It is observed that, compared to the single-phase simulation, the two-phase one obtains a smoother water surface and prevents the non-physical water splash when interacting with the sloped dissipative beach. This wave basin is also used to investigate wave-structure problems such as wave interaction with a rigid cantilever beam fixed to the basin bottom and downstream of the wave-maker mechanism and the dynamics of a single floating box and two floating boxes in the waves. A typical wave-structure interaction period is captured and described using pressure contours and velocity vectors at three selected instants for the wave-rigid cantilever beam case. With the increase of the structure’s height, the wave height after the structure decreases, but no evident variation is found when changing its thickness. Besides the hydrodynamics interaction, a periodical collision is observed between the two floating boxes on the wave surface.

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Dufty, J. W., e J. J. Brey. "Choosing Hydrodynamic Fields". Mathematical Modelling of Natural Phenomena 6, n. 4 (2011): 19–36. http://dx.doi.org/10.1051/mmnp/20116402.

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Daud, Nurul Rabitah, e Mohd Fadzil Mohd Akhir. "Hydrodynamic Modelling of Bidong Island Vicinity Waters". Open Journal of Marine Science 05, n. 03 (2015): 306–23. http://dx.doi.org/10.4236/ojms.2015.53026.

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Rajar, Rudi, e Matjaz Cetina. "Hydrodynamic and water quality modelling: An experience". Ecological Modelling 101, n. 2-3 (agosto 1997): 195–207. http://dx.doi.org/10.1016/s0304-3800(97)00047-1.

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Rajar, Rudi, Matjaz Cetina e Andrej Sirca. "Hydrodynamic and water quality modelling: case studies". Ecological Modelling 101, n. 2-3 (agosto 1997): 209–28. http://dx.doi.org/10.1016/s0304-3800(97)00052-5.

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van der Westhuizen, Izak P., Brian van Soelen e Petrus J. Meintjes. "Emission modelling of hydrodynamic AGN jet simulations". Proceedings of the International Astronomical Union 14, S342 (maggio 2018): 209–13. http://dx.doi.org/10.1017/s1743921318008050.

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AbstractRadio-loud Active Galactic Nuclei (AGN) produce relativistic jets that can be modelled with relativistic hydrodynamic (RHD) simulations. In this study we present two such simulations of jets, used to investigate the parameters required to reproduce structures consistent with both FR I and FRII jets. In the first simulation a Lorentz factor of 10 and supersonic flow of Mach 30 were chosen, while for the second simulation a Lorentz factor of 1.0014 with a supersonic flow of Mach 4 was used. Over similar distances scales the first case shows a well collimated beam with a strong shock at the interface between the jet and ambient medium while the second case shows a less stable beam and a larger cocoon. To determine whether the simulated physical structures are consistent with the observed FR I/II jets, the synchrotron emission has been calculated to produce radio maps at a single frequency of 1.5 GHz.

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Lancashire, J. R. "Modelling the hydrodynamic resistance of bordered pits". Journal of Experimental Botany 53, n. 373 (1 giugno 2002): 1485–93. http://dx.doi.org/10.1093/jexbot/53.373.1485.

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Brinkmann, Ulf, Anna Janzen e Eugeny Y. Kenig. "Hydrodynamic analogy approach for modelling reactive absorption". Chemical Engineering Journal 250 (agosto 2014): 342–53. http://dx.doi.org/10.1016/j.cej.2014.03.066.

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Varas, D., R. Zaera e J. López-Puente. "Numerical modelling of the hydrodynamic ram phenomenon". International Journal of Impact Engineering 36, n. 3 (marzo 2009): 363–74. http://dx.doi.org/10.1016/j.ijimpeng.2008.07.020.

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Pelecanos, Loizos, Stavroula Kontoe e Lidija Zdravković. "Numerical modelling of hydrodynamic pressures on dams". Computers and Geotechnics 53 (settembre 2013): 68–82. http://dx.doi.org/10.1016/j.compgeo.2013.04.003.

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Vertes, A., P. Juhasz, M. De Wolf e R. Gijbels. "Hydrodynamic modelling of laser plasma ionization processes". International Journal of Mass Spectrometry and Ion Processes 94, n. 1-2 (novembre 1989): 63–85. http://dx.doi.org/10.1016/0168-1176(89)80060-6.

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Lancashire, J. R., e A. R. Ennos. "Modelling the hydrodynamic resistance of bordered pits". Journal of Experimental Botany 53, n. 373 (giugno 2002): 1485–93. http://dx.doi.org/10.1093/jxb/53.373.1485.

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Sarvothaman, Varaha Prasad, Alister Thomas Simpson e Vivek Vinayak Ranade. "Modelling of vortex based hydrodynamic cavitation reactors". Chemical Engineering Journal 377 (dicembre 2019): 119639. http://dx.doi.org/10.1016/j.cej.2018.08.025.

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Kreuzer, E., e M. Wendt. "Ship capsizing analysis using advanced hydrodynamic modelling". Philosophical Transactions of the Royal Society of London. Series A: Mathematical, Physical and Engineering Sciences 358, n. 1771 (15 giugno 2000): 1835–51. http://dx.doi.org/10.1098/rsta.2000.0617.

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Willis, Jay. "Modelling swimming aquatic animals in hydrodynamic models". Ecological Modelling 222, n. 23-24 (dicembre 2011): 3869–87. http://dx.doi.org/10.1016/j.ecolmodel.2011.10.004.

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Kotsialos, Apostolos. "A hydrodynamic modelling framework for production networks". Computational Management Science 7, n. 1 (24 aprile 2008): 61–83. http://dx.doi.org/10.1007/s10287-008-0076-1.

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41

Delgado-Buscalioni, R., P. V. Coveney e G. De Fabritiis. "Towards multi-scale modelling of complex liquids using hybrid particle—continuum schemes". Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 222, n. 5 (1 maggio 2008): 769–76. http://dx.doi.org/10.1243/09544062jmes746.

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Abstract (sommario):

Owing to the interplay between molecular and mesoscopic processes, the modelling and simulation of complex liquids at nano- and micron-scales require a multi-scale approach. A hybrid technique is proposed to handle multi-scale phenomena, which retains the full molecular nature of the system where it is of interest while coarse-graining it elsewhere. The method couples molecular dynamics (MD) and fluctuating hydrodynamics (FH) based on the Landau theory. Mean flows involving transport of transversal (shear) and longitudinal momentum (sound) are coupled across the interface of both MD and FH domains. Hydrodynamic fluctuations of mass and momentum are transferred, preserving consistency with hydrodynamics and thermodynamics. Here the hybrid method is illustrated by studying the reflection of water sound waves against a lipid (dimyristoylphosphatidylcholine) monolayer.

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42

Plez, Bertrand. "The modelling of M-giant spectra". Symposium - International Astronomical Union 191 (1999): 75–83. http://dx.doi.org/10.1017/s007418090020291x.

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I review the current status of cool O-rich giant star spectral modelling, stressing some specific problems like line profiles and molecular data completeness. I discuss recent progress in molecular line lists (TiO, VO) and describe recent attempts in modelling normal M-giants as well as AGB star spectra, using static and hydrodynamic models. I anticipate further advances in the near future, with better radiative transfer in hydrodynamic models, that will allow detailed comparisons of models and observations, opening the possibility of deriving stellar parameters from spectroscopic and interferometric observations.

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43

Shan, Shiliang, e Jinyu Sheng. "Examination of circulation, flushing time and dispersion in Halifax Harbour of Nova Scotia". Water Quality Research Journal 47, n. 3-4 (1 agosto 2012): 353–74. http://dx.doi.org/10.2166/wqrjc.2012.041.

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This study examines the circulation, flushing time and hydrodynamic connectivity in Halifax Harbour based on three-dimensional currents produced by a multi-nested coastal ocean circulation modelling system. The time-mean currents produced by the modelling system feature two-layer estuarine circulation with a seaward flow in the upper layer and a landward flow in the lower layer in the Harbour. The hydrodynamics in the Harbour are also affected significantly by tides and wind forcing. Based on numerical passive tracer experiments, the estimated e-folding flushing time is about 40 and 90 days in the upper and the entire Bedford Basin, respectively. By comparison, the flushing time is about 2–5 days over the Inner and Outer Harbour, and only about 1 day in the Narrows. Analysis of passive particle trajectories carried by the model currents demonstrates that movements of particles in the Harbour are strongly affected by tidal and storm-induced currents. Hydrodynamic connectivity in the study region is also quantified in terms of a connectivity matrix calculated from particle trajectories.

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Khoirunnisa, H., M. Wibowo, W. Hendriyono e K. S. Wardani. "The hydrodynamics condition of water operating area for flight test site selection of N219 Amphibious aircraft". IOP Conference Series: Earth and Environmental Science 930, n. 1 (1 dicembre 2021): 012056. http://dx.doi.org/10.1088/1755-1315/930/1/012056.

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Abstract This research aims to assess the hydrodynamics condition of the water area for site selection of that purpose. The bathymetry data of Karimunjawa Island were obtained from the 1986 Pushidrosal bathymetric map. Furthermore, wind direction, wind speed, wave height and direction, and tidal data around the waters of Karimunjawa Island were input in hydrodynamic and spectral modelling using MIKE 21 HD-SW. West monsoon and east monsoon were applied in this model. The validation result between hydrodynamic modelling and Tidal Model Driver (TMD) data is 98.89%. The surface elevation around the domain has a range of 0.072 - 0.5 m. The average water depth at the seaplane dock plan is about 2.5 m from MSL. The hydrodynamic modeling results show that the surface elevation value at the seaplane dock plan location shows that the sea level is between -0.467 to 0.473 m (in both west and east season). The current velocity at the planned seaplane dock site in both the west and east monsoons is relatively slow (<0.185 m/s). The dominant wave direction is southeastward in the east and west monsoons. The dominant Hs is about 0.23 – 0.6 m in both seasons. At the planned water operating area, the average of Hs is 0.23 m - 0.36 m. Generally, this location fulfills the criteria of site selection for the flight test location of N219A.

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45

Rakhymberdina, M. Ye, E. V. Grokhotov, Zh A. Assylkhanova e M. M. Toguzova. "USING SPACE SURVEY MATERIALS FOR MODELING HYDRODYNAMIC ACCIDENTS AT MINING ENTERPRISES IN KAZAKHSTAN". International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLVI-5/W1-2022 (3 febbraio 2022): 193–98. http://dx.doi.org/10.5194/isprs-archives-xlvi-5-w1-2022-193-2022.

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Abstract. The timeliness of using modern computer programs for modelling flood zones, the consequences of hydraulic accidents, dam breakthroughs, flood and flood forecasting in a complex system of rivers and channels for the prevention of hydro meteorological emergencies is beyond doubt. The use of BIM technologies will make it possible to move from point-based flood risk assessments to areal ones, which will significantly improve the reliability of planned measures to prevent natural and anthropogenic emergencies.The purpose - to perform works on modelling of hydrodynamic accident and forecast of its development by the example of tailings dumps in concentration plant in East Kazakhstan. As the initial data - digital model for the area of work, technical reports on engineering-hydrographical survey, topographic-geodetic works, engineering-geological survey, high-resolution satellite images in a panchromatic survey mode. On the basis of geoinformation modelling methods with use of initial and remote sensing data, final digital terrain model was built in Digital software. The method based on direct hydrodynamic modelling of area flooding was used to calculate hydrodynamic accidents, to model the dynamics of area flooding because of tailings dam break in several levels. The practical result is numerical hydrodynamic modelling of dynamics flooding area because of partial destruction, erosion of embankment dam of tailings concentrator, total area and extent of flooding, as well as the area and depth of partially flooded buildings of residential development was estimated, thematic maps of flooded area were created, as well as maps of water passage with flow velocities during the hydrodynamic accident.Thus, the application of advanced space imagery, GIS technologies in full measure allow for simulating the occurrence, development of hydrodynamic accidents in structures, to determine area, time of flooding.

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46

Szeląg, Bartosz, Łukasz Bąk, Roman Suligowski e Jarosław Górski. "Statistical models to predict discharge overflow". Water Science and Technology 78, n. 5 (6 settembre 2018): 1208–18. http://dx.doi.org/10.2166/wst.2018.392.

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Abstract In the paper, a comparison of prediction results concerning the annual number of discharges of stormwater from the drainage system due to stormwater overflows is depicted. The prediction has been computed by means of storm water management model (SWMM) and probabilistic models. Regarding the probabilistic modelling some simple statistical models such as logit, probit, Gompertz and linear discriminant analysis model have been applied, and as for the hydrodynamic modelling a generator of synthetic rainfall based on the Monte Carlo method has been used. The analyses conducted has shown that logit, probit and Gompertz models give outputs that are comparable with the results of hydrodynamic modelling and are concordant with observations. Whereas the annual number of stormwater discharge predicted by the linear discriminant analysis model is significantly lower than the number obtained by hydrodynamic modelling. The calculations made have confirmed the possibility of using statistical models as an alternative for developing labour-consuming and complex hydrodynamic models. The statistical models can be used successfully to predict the stormwater overflows operation provided that the measurements of rainfall in the catchment and of filling the overflow are available.

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47

Shum, H., E. A. Gaffney e D. J. Smith. "Modelling bacterial behaviour close to a no-slip plane boundary: the influence of bacterial geometry". Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 466, n. 2118 (13 gennaio 2010): 1725–48. http://dx.doi.org/10.1098/rspa.2009.0520.

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We describe a boundary-element method used to model the hydrodynamics of a bacterium propelled by a single helical flagellum. Using this model, we optimize the power efficiency of swimming with respect to cell body and flagellum geometrical parameters, and find that optima for swimming in unbounded fluid and near a no-slip plane boundary are nearly indistinguishable. We also consider the novel optimization objective of torque efficiency and find a very different optimal shape. Excluding effects such as Brownian motion and electrostatic interactions, it is demonstrated that hydrodynamic forces may trap the bacterium in a stable, circular orbit near the boundary, leading to the empirically observable surface accumulation of bacteria. Furthermore, the details and even the existence of this stable orbit depend on geometrical parameters of the bacterium, as described in this article. These results shed some light on the phenomenon of surface accumulation of micro-organisms and offer hydrodynamic explanations as to why some bacteria may accumulate more readily than others based on morphology.

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48

Hardhiyanti, Wulan Fitry, Yessi Nirwana Kurniadi, Eva Mustikasari e Yogi Noviadi. "Pola Hidrodinamika di Perairan Nunukan sebagai Usulan pada Permasalahan Abrasi Pulau-pulau Kecil. (Hal. 58-69)". RekaRacana: Jurnal Teknil Sipil 4, n. 2 (7 giugno 2018): 58. http://dx.doi.org/10.26760/rekaracana.v4i2.58.

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ABSTRAKPerairan Nunukan yang berada di Provinsi Kalimantan Utara, merupakan salah satu wilayah terluar Indonesia yang berbatasan langsung dengan Negara Malaysia. Berada dalam wilayah terluar, Kabupaten Nunukan menyimpan banyak potensi dalam sektor kelautan dan perikanan. Sangat penting untuk menjaga zona ekonomi eksklusif pulau-pulau kecil terluar Indonesia dari abrasi. Besar abrasi yang mungkin terjadi dapat diketahui dengan melakukan analisis pemodelan mengenai hidrodinamika wilayah tersebut. Pemodelan numerik dilakukan menggunakan perangkat lunak MIKE 21 dengan modul Hydrodynamic (HD). Pemodelan yang dilakukan terdiri dari grid persegi dan mesh terstruktur. Hasil penelitian menunjukkan terdapat beberapa daerah di Kabupaten Nunukan terjadi peningkatan kecepatan arus antara 0,1625 m/s sampai 0,3 m/s yang berpotensi terjadi abrasi. Abrasi terjadi di barat daya Pulau Sebatik, Perairan Nunukan sepanjang 1.014,26 meter. Penelitian sebelumnya menunjukkan, ukuran butir di wilayah tersebut sebesar pasir kelanauan sebesar 0,01 mm. Terdapat hubungan antara kecepatan dan ukuran butir yang menyatakan wilayah tersebut memiliki potensi abrasi.Kata kunci: hidrodinamika, pemodelan, arus, pasang surut, abrasiABSTRACTSebatik Island is located in Nunukan sea at North Kalimantan Province. This island is one of the outermost area in Indonesia which is in border line with Malaysia. These outlying islands keep a lot of potential in marine, and fishery. It is important to keep Indonesia exclusive economic zone by protecting this outlying island from abrasion. Abrasion can be found by analyzing hydrodynamic modelling in the area. Hydrodynamic modelling is using software MIKE 21 with Hydrodynamic modules (HD). The numerical hydrodynamic modelling was consists of rectangular grid and unstructured mesh modelling. The modelling showed there are some area in Kabupaten Nunukan are has increase of current velocity between 0.1625 m/s and 0.3 m/s that potentially to abrasion. Abrasion occurred in the southwest of Sebatik Island, Nunukan sea along 1,014.26 meters. Based on the observation before, the grain size in the area was 0.01 mm sand silt. There is correlation between the current velocity and grain size in the area has potentially to abrasion.Keywords: hydrodynamic, modelling, current, tides, abrasion

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49

Derco, Ján, Milan Králik, Miroslav Hutnan, Igor Bodík e Rastislav Cernák. "Modelling of the carrousel plant". Water Science and Technology 30, n. 6 (1 settembre 1994): 345–54. http://dx.doi.org/10.2166/wst.1994.0285.

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The results of experimental and mathematical modelling of simultaneous processes of organic and nitrogen impurities removal in an industrial Carrousel wastewater treatment plant are presented. The hydrodynamic regime measurements in the full-scale Carrousel system have led to the conclusion that at least three hydrodynamic models such as tank-in-series, ideally mixing reactor with aerobic and anoxic volume and completely mixing reactor with an intermittent aeration, are suitable to describe the dynamic behaviour of this bioreactor. The tank-in-series and the intermittently aerated completely mixing equipments were used in lab-scale modelling of the Carrousel plants. Various kinetic models and a statistical approach were applied to the evaluation of laboratory and full-scale data. The simplified kinetic model proved to be convenient for the process control purposes due to the significant computational time reduction in model parameters determination in comparision to tank-in-series hydrodynamic modelling. Also, the statistical model is very suitable approximation of the processes carried out in the Carrousel system. The completely mixing bioreactor with intermittent aeration is advantageous for experimental simulation of simultaneous nitrification and denitrification processes performed in high-rate recycled activated sludge systems. The influence of wastewater substances on oxygen transport rate is implicitly incorporated through aerobic and anoxic ‘switching functions’ evaluated based on oxygen profile data monitored in the bioreactor when applying the modified IAWPRC kinetic model.

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50

Wright, K. A., D. H. Goodman, N. A. Som, J. Alvarez, A. Martin e T. B. Hardy. "Improving Hydrodynamic Modelling: an Analytical Framework for Assessment of Two-Dimensional Hydrodynamic Models". River Research and Applications 33, n. 1 (2 agosto 2016): 170–81. http://dx.doi.org/10.1002/rra.3067.

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