Relevant bibliographies by topics / Hydrodynamic efficiency

Academic literature on the topic 'Hydrodynamic efficiency'

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Published: 4 June 2021
Last updated: 20 February 2023

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Journal articles on the topic "Hydrodynamic efficiency"

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Garcia, Paulo A., Zhifei Ge, Laura E. Kelley, Steven J. Holcomb, and Cullen R. Buie. "High efficiency hydrodynamic bacterial electrotransformation." Lab on a Chip 17, no. 3 (2017): 490–500. http://dx.doi.org/10.1039/c6lc01309k.

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Gutiérrez, A., M. C. Álvarez, J. H. Gaviño, and N. Carbajal. "Theoretical hydrodynamic efficiency of coccoliths." Marine Micropaleontology 152 (September 2019): 101746. http://dx.doi.org/10.1016/j.marmicro.2019.04.005.

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Naemi, Roozbeh, William J. Easson, and Ross H. Sanders. "Hydrodynamic glide efficiency in swimming." Journal of Science and Medicine in Sport 13, no. 4 (July 2010): 444–51. http://dx.doi.org/10.1016/j.jsams.2009.04.009.

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Belincanta, Juliana, Teresa Massako Kakuta Ravagnani, and João Alexandre Ferreira Pereira. "The Parastillation Efficiency and Hydrodynamic Behaviour." Canadian Journal of Chemical Engineering 83, no. 3 (May 19, 2008): 582–85. http://dx.doi.org/10.1002/cjce.5450830324.

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Basko, M. M. "Hydrodynamic efficiency of illumination by ion beams." Laser and Particle Beams 8, no. 3 (September 1990): 409–19. http://dx.doi.org/10.1017/s026303460000865x.

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The hydrodynamic efficiency of conversion of the energy of fast charged particles into the kinetic energy of the bulk motion of plane-parallel shells is investigated in the framework of two simple models–one based on the stepwise density profile and the other employing a self-similar solution. The analytical estimates obtained are substantiated with ID hydrodynamic calculations. In case of spherical shells, the three key dimensionless parameters determining the values of the hydrodynamic efficiency are pointed out; the dependence of the hydrodynamic efficiency on these parameters has been explored numerically. The effects of a nonuniform energy deposition (increasing by the end of the fast particle ranges) and of a nonuniform absorber composition are also discussed.
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Cwudziński, Adam, and Bernadeta Gajda. "Particle Image Velocimetry Method for Prediction Hydrodynamic Conditions during Leaching Process on the Basis of Sn–NaOH System." Materials 14, no. 3 (January 29, 2021): 633. http://dx.doi.org/10.3390/ma14030633.

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In leaching processes controlled by diffusion and convectional transport of mass, the hydrodynamic structure formed in the reactor’s working volume is an additional factor affecting the process. This research work presents results related to hydrodynamic structures developing in batch reactors, different in shape, recorded by means of the particle image velocimetry (PIV) method. The movement of the distilled water and leaching solution was analyzed during investigations. Next, the system hydrodynamics and the process of tin leaching were analyzed. Finally, the leaching is affected by the reactor geometry and the hydrodynamic structure developed in its working volume, especially when a convectional or diffusion mass transport decides the process efficiency.
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Sanmartin, J. R., J. L. Montanes, J. Sanz, and R. Ramis. "The hydrodynamic efficiency of laser-target acceleration." Plasma Physics and Controlled Fusion 27, no. 9 (September 1, 1985): 983–93. http://dx.doi.org/10.1088/0741-3335/27/9/004.

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McCALLUM, DONALD, ALLEN H. ENGLE, GREGORY P. PLATZER, and GABOR KARAFIATH. "Hydrodynamic Efficiency Improvements for U.S. Navy Ships." Naval Engineers Journal 103, no. 3 (May 1991): 74–90. http://dx.doi.org/10.1111/j.1559-3584.1991.tb00939.x.

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PLATZER, GREGORY P., DONALD N. MCCALLUM, GABOR KARAFIATH, and ALLEN H. ENGLE. "HYDRODYNAMIC EFFICIENCY IMPROVEMENTS FOR U.S. NAVY SHIPS." Naval Engineers Journal 103, no. 4 (July 1991): 102–4. http://dx.doi.org/10.1111/j.1559-3584.1991.tb01000.x.

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Vorus, William S., and Brandon M. Taravella. "Anguilliform fish propulsion of highest hydrodynamic efficiency." Journal of Marine Science and Application 10, no. 2 (June 2011): 163–74. http://dx.doi.org/10.1007/s11804-011-1056-3.

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Dissertations / Theses on the topic "Hydrodynamic efficiency"

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Teixeira, E. C. "Hydrodynamic processes and hydraulic efficiency of chlorine contact units." Thesis, University of Bristol, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.495625.

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McLetchie, Karl-Magnus Weidmann. "Force and hydrodynamic efficiency measurements of a three-dimensional flapping foil." Thesis, Massachusetts Institute of Technology, 2004. http://hdl.handle.net/1721.1/33437.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering; and, (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2004.
Includes bibliographical references (p. 69-70).
Investigations into unsteady flapping foil propulsion have shown that it is an efficient and high thrust means of propulsion. Extensive work has been done to optimize the efficiency of two-dimensional flapping foils, varying both the kinematics of the motion and the flexibility of the foil. However, no thorough investigation into the hydrodynamic efficiency of three-dimensional flapping foils has been made. In this thesis, experimental hydrodynamic efficiency measurements and force measurements of a three-dimensional flapping foil are presented. These measurements were made by mounting a small, six-axis dynamometer directly onto the foil shaft of a flapping foil module. The module uses two computer controlled servo motors to actuate a foil in a sinusoidal pitch and roll motion, similar to the motion of a penguin's wing. The measured thrust coefficients compared well to previous experimental results, and the on-shaft dynamometer proved to be a valuable sensor. However, the experimental apparatus must be modified before reliable efficiency results can be made for the entire range of kinematics.
(cont.) Once these improvements are made, a thorough investigation into the effects of foil geometry and flexibility can be done to find the optimum efficiency parameters of a three-dimensional flapping foil. These optimum efficiency parameters will be valuable for the development of flapping foil vehicles.
by Karl-Magnus Weidmann McLetchie.
S.M.
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Potts, John B. III. "Developing and Testing an Anguilliform Robot Swimming with Theoretically High Hydrodynamic Efficiency." ScholarWorks@UNO, 2015. http://scholarworks.uno.edu/td/2103.

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An anguilliform swimming robot replicating an idealized motion is a complex marine vehicle necessitating both a theoretical and experimental analysis to completely understand its propulsion characteristics. The ideal anguilliform motion within is theorized to produce ``wakeless'' swimming (Vorus, 2011), a reactive swimming technique that produces thrust by accelerations of the added mass in the vicinity of the body. The net circulation for the unsteady motion is theorized to be eliminated. The robot was designed to replicate the desired, theoretical motion by applying control theory methods. Independent joint control was used due to hardware limitations. The fluid velocity vectors in the propulsive wake downstream of the tethered, swimming robot were measured using Particle Image Velocimetry (PIV). Simultaneously, a load cell measured the thrust (or drag) forces of the robot via a hydrodynamic tether. The measured field velocities and thrust forces were compared to the theoretical predictions for each. The desired, ideal motion was not replicated consistently during PIV testing, producing off-design scenarios. The thrust-computing method for the ideal motion was applied to the actual, recorded motion and compared to the load cell results. The theoretical field velocities were computed differently by accounting for shed vortices due to a different shape than ideal. The theoretical thrust shows trends similar to the measured thrust over time. Similarly promising comparisons are found between the theoretical and measured flow-field velocities with respect to qualitative trends and velocity magnitudes. The initial thrust coefficient prediction was deemed insufficient, and a new one was determined from an iterative process. The off-design cases shed flow structures into the downstream wake of the robot. The first is a residual disturbance of the shed boundary layer, which is to be expected for the ideal case, and dissipates within one motion cycle. The second are larger-order vortices that are being shed at two distinct times during a half-cycle. These qualitative and quantitative comparisons were used to confirm the possibility of the original hypothesis of ``wakeless'' swimming. While the ideal motion could not be tested consistently, the results of the off-design cases agree significantly with the adjusted theoretical computations. This shows that the boundary conditions derived from slender-body constraints and the assumptions of ideal flow theory are sufficient enough to predict the propulsion characteristics of an anguilliform robot undergoing this specific motion.
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Nguyen, Khanh Quoc. "Hydrodynamic Study of Pisciform Locomotion with a Towed Biolocomotion Emulator." Thesis, Virginia Tech, 2021. http://hdl.handle.net/10919/103626.

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The ability of fish to deform their bodies in steady swimming action is gaining from robotic designers. While bound by the same physical laws, fish have evolved to move in ways that often outperform artificial systems in critical measures such as efficiency, agility, and stealth through thousands of years of natural selection. As we expand our presence in the ocean with deep-sea exploration or offshore drilling for petroleum and natural gas, the demand for prolonging underwater operations is growing significantly. Therefore, it is critical for robotic designers to understand the physics of pisciform (fish-like) locomotion and learn how to effectively implement the propulsive mechanisms into their designs to create the next generation of aquatic robots. Aiming to assist this process, this thesis presents an experimental apparatus called Towed Biolocomotion Emulator (TBE), which is capable of imitating the undulating action of different fish species in steady swimming and can be quickly adapted to different configurations with modular modules. Using the TBE device, an experiment is performed to test its hydrodynamic performance and evaluate the effectiveness of the bio-inspired locomotion implemented on such a mechanical system. The analysis of hydrodynamic data collected from the experiment shows that there exists a small range of kinematic parameters where the undulating motion of the device produces the optimal performance. This result confirms the benefits of utilizing pisciform locomotion for small-scale underwater vehicles. In addition, this thesis also proposes a reduced-order flow model using the unsteady vortex lattice method (UVLM) to predict the hydrodynamic performance of such a system. The proposed model is then validated with the experimental data collected earlier. The tool developed can be employed to quickly explore the possible design space early in the conceptual design stage for such a bio-mimetic vehicle.
Master of Science
It is no surprise that through thousands of years of natural evolution, marine species possess incredible ability to navigate through water. As we expand our presence in the sea, more and more tasks require underwater operations such as ocean exploration, oil-rig maintenance, etc. Yet, most of the underwater robotic vehicles still utilize propellers as the primary propulsive mechanism. In many cases, the bio-inspired propulsion system that mimics the swimming action of fish offers many advantages in agility, maneuverability, and stealth. With the rising interest in the field, the works presented in this thesis aim to expand our understanding of how to implement the bio-inspired propulsive mechanism to robotic design. To achieve this, a mechanical device is designed to mimic the swimming action of different fish species. Then, an experiment is performed to subject the device to different fish-like motions and test their effectiveness. In addition, a reduced-ordered model is also introduced as an alternative method to predict the hydrodynamic performance of this propulsive mechanism. The works presented in this thesis help to expand the toolbox available for the engineer to design the next generation of the underwater robotic vehicle.
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Annerstedt, Måns, and Axel Apoy. "Fartförlust på grunt vatten : En jämförelse av bränsleförbrukning och tidsåtgång för rutter med olika djup och distans." Thesis, Linnéuniversitetet, Sjöfartshögskolan (SJÖ), 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-43451.

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Denna studie handlar om den fartförlust och därmed den ökade energiförbrukningen som drabbar fartyg på grunt vatten. Syftet var att ta reda på hur mycket kortare en grund passage behöver vara för att den ska vara ett bättre alternativ än en lång och djup rutt med hänsyn till bränsleförbrukning och tidsåtgång. Resultatet av detta blev att det inte går att dra några generella slutsatser som gäller för alla fartygstyper men att det går att se tydliga tendenser. Studien hade även som målsättning att skapa ett underlag som skulle kunna användas av nautiker vid planering av resor, detta presenterades i form av en sammanställning av de resultat som erhållits vid beräkning av fartförlust i öppet vatten. Någon sammanställning gjordes inte för begränsat vatten eftersom exempelfartygen där fick likadana resultat vilket skulle ha gjort en sådan överflödig. Syftet uppnåddes genom användande av kvantitativa studier i form av matematiska beräkningsmetoder för att beräkna fartförlust, bränsleförbrukning och tidsåtgång för ett antal exempelfartyg.
This study concerns the speed loss and thereby the increased energy consumption which affects ships in shallow water. The aim of the study was to gain knowledge of how much shorter a shallow passage is required to be in order to be the better alternative compared to a long and deep route with regard to fuel and time consumption. The result was that it is not possible to draw any definitive conclusions which are applicable to all ship types, however, there are clear patterns. Moreover, the goal of the study was to aid mariners facing a choice between a long and deep route and a short and shallow route, this was done by creating a compilation of the results for speed loss in open water. Due to the results for confined waters being the same for all the ships in the study, no compilation was done for confined waters as it was deemed excessive. The aim of the study was achieved by quantitative research in the form of mathematical models to calculate speed loss, fuel consumption and time consumption for a number of fictitious ships.
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Horko, Michael. "CFD optimisation of an oscillating water column wave energy converter." University of Western Australia. School of Mechanical Engineering, 2008. http://theses.library.uwa.edu.au/adt-WU2008.0089.

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Although oscillating water column type wave energy devices are nearing the stage of commercial exploitation, there is still much to be learnt about many facets of their hydrodynamic performance. This research uses the commercially available FLUENT computational fluid dynamics flow solver to model a complete OWC system in a two dimensional numerical wave tank. A key feature of the numerical modelling is the focus on the influence of the front wall geometry and in particular the effect of the front wall aperture shape on the hydrodynamic conversion efficiency. In order to validate the numerical modelling, a 1:12.5 scale experimental model has been tested in a wave tank under regular wave conditions. The effects of the front lip shape on the hydrodynamic efficiency are investigated both numerically and experimentally and the results compared. The results obtained show that with careful consideration of key modelling parameters as well as ensuring sufficient data resolution, there is good agreement between the two methods. The results of the testing have also illustrated that simple changes to the front wall aperture shape can provide marked improvements in the efficiency of energy capture for OWC type devices.
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Li, Bin. "Efficient water wave and current propagation modelling." Thesis, Imperial College London, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.281589.

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Hinkelmann, Reinhard. "Efficient numerical methods and information-processing techniques for modeling hydro- and environmental systems /." Berlin [u.a.] : Springer, 2005. http://www.loc.gov/catdir/enhancements/fy0663/2004116864-d.html.

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Zvandasara, Tendayi. "Influence of hydrodynamics on carbon steel erosion-corrosion and inhibitor efficiency in simulated oilfield brines." Thesis, University of Glasgow, 2010. http://theses.gla.ac.uk/2284/.

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Corrosion within the oil and gas sector is an ongoing concern for operators. The challenging nature of extraction and processing fluids is an unavoidable cause of severe metallic corrosion. With modern emphasis on health, safety and the environment, the case for managing corrosion has become an imperative agenda. Whilst new and more effective methods of mitigation are key, an interim solution is improving the value of current methods. A literature survey carried out within this project has revealed CO2 corrosion as contributing to most corrosion related failures within the industry. The corrosion behaviour in CO2 containing environments is complex partly due to the wide range of prevailing conditions such as temperature, CO2 concentration and flow conditions. For oil and gas transportation pipelines, internal corrosion mitigation can be achieved by the use of chemical inhibitors. Inhibitors have been established to be effective but are by no means a complete solution. Issues such as their effectiveness in high velocity and high shear flow are a main consideration for their function. The hydrodynamic nature of the flowing fluids can affect inhibitor efficiency by either slowing the rate of formation of the inhibitive layer or causing degradation of well-formed inhibitive layers. A combined effect may also be active. The corrosion behaviour of carbon steel in simulated oilfield conditions is investigated in this project with emphasis on conditions of varying velocity, impinging flow and consequently shear stress. Since inhibition is the main mitigation technique for fluid related corrosion, the efficiency of a commercially used inhibitor is, in this case assessed in the abovementioned conditions. To simulate both impingement and flow, a jet impingement apparatus is used in conjunction with a segmented-electrode specimen set up to separately study the erosion-corrosion behaviour of different hydrodynamic zones under the jet. Corrosion rates are measured by gravimetric analysis and results are also evaluated with electrochemistry. Additionally, galvanic interactions between the different hydrodynamic zones have been investigated. Visual and light-optical microscopic examinations are also used to assess variable effects within the zones. Under such conditions, the corrosion rates have been found to be significantly higher in impingement zones. Aerated conditions have shown a significant variation in corrosion behaviour between impingement and non-impingement zones. The results in CO2 saturated brines are consistent but with evidence of different relations between hydrodynamics and the corrosion rate. The inhibitor has been shown to be effective in CO2 saturated brines and significantly influenced by both inhibitor concentration and hydrodynamic conditions. Inhibitor efficiency has also shown a complex dependence on concentration and establishes a need to evaluate optimum inhibitor concentrations before field application. Evaluation of the mass loss results against electrochemistry has shown a large discrepancy between the two methods. This rather surprising result suggests solid-free flow is not entirely free of erosion and synergistic effects. This comprehensive study has not only improved current knowledge on the relation between hydrodynamics and inhibitor efficiency but also indicates a critical need to evaluate suitability of current monitoring methods. Electrochemical methods are increasingly used as a method of choice and while they contribute significant monitoring data, they are observed to be unable, alone, to monitor erosion and synergy. An industry review on their suitability to monitor solid-free flow corrosion is recommended.
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Stewart, Kelley Christine. "Quantitative Hydrodynamics Analysis of Left Ventricular Diastolic Dysfunction using Color M-Mode Echocardiography." Thesis, Virginia Tech, 2008. http://hdl.handle.net/10919/35466.

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Numerous studies have shown that cardiac diastolic dysfunction and diastolic filling play a critical role in dictating overall cardiac health and demonstrated that the filling wave propagation speed is a significant index of the severity of diastolic dysfunction. However, the governing flow physics underlying the relationship between propagation speed and diastolic dysfunction are poorly understood. More importantly, currently there is no reliable metric to allow clinicians the ability to diagnose cardiac dysfunction. There is a greater need than ever for more accurate and robust diagnostic tools with the increasing number of deaths caused by this disease. Color M-mode (CMM) echocardiography is a technique that is commonly used in the diagnosis of Left Ventricular Diastolic Dysfunction (LVDD) and is used as the image modality in this work. The motivation for the current work is a hypothesized change in the mechanism driving early diastolic filling. The early filling wave of a healthy patient is driven by a rapid early diastolic relaxation creating a pressure difference within the left ventricle despite the fact the left ventricular volume is increasing. As diastolic dysfunction progresses, the left ventricular relaxation declines and it is hypothesized that the left atrial pressure rises to create the favorable pressure difference needed to drive early diastole. This changes the mechanism driving early diastolic filling from a pulling mechanism primary driven by left ventricular relaxation to a pushing mechanism primarily driven by high left atrial pressure. Within this study, CMM echocardiography images from 125 patients spanning healthy and the three stages of LVDD are analyzed using a newly developed automated algorithm. For the first time, a series of isovelocity contours is utilized to estimate the conventional propagation velocity. A critical point within the early filling wave is quantified as the point of early filling velocity deceleration. The clinically used propagation velocity is compared to a novel critical point propagation velocity calculated as a weighted average of the propagation velocities before and after the critical point showing an increase in the correlation between decreasing diastolic dysfunction stage and decreasing propagation velocity. For the first time the spatial pressure distributions calculated as the pressure relative to the mitral valve pressure at each location from the mitral valve to the ventricular apex, are quantified and analyzed at the instant of peak mitral to apical pressure difference for patients with varying stages of LVDD. The analysis of the spatial pressure distribution revealed three filling regions present in all patients. The pressure filling regions were used to calculate a useful filling efficiency with healthy patients having a useful filling efficiency of 64.8 ± 12.7% and severely diseased filling patients having an efficiency of 37.1 ± 12.1%. The newly introduced parameters and analysis of the CMM echocardiography data supports the hypothesis of a change in the mechanism driving early diastolic efficiency by displaying a decline in the early diastolic propagation velocity earlier into the left ventricle for severely diseased patients than for healthy filling patients and a premature breakup of the progressive pressure gradient fueling early diastolic filling in severely diseased patients.
Master of Science
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Books on the topic "Hydrodynamic efficiency"

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Parkin, P. The efficiency of continuous hydrodynamic wire cleaning processes. Birmingham: University of Birmingham, 1986.

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Kalwij, Ineke Margôt. Assessing the field irrigation performance and alternative management options for basin surface irrigation systems through hydrodynamic modeling. Lahore: Pakistan National Program, International Irrigation Management Institute, 1996.

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Anderson, Jamie Marie. Vorticity control for efficient propulsion. Woods Hole, Mass: Woods Hole Oceanographic Institution, 1996.

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Eriksson, Bjo rn. Control strategy for energy efficient fluid power actuators: Utilizing individual metering. Linko ping: Department of Management and Engineering, Linko ping University, 2007.

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Arcement, George J. Guide for selecting Manning's roughness co-efficients for natural channels and flood plains. [Reston, Va.?]: Dept. of the Interior, U.S. Geological Survey, 1989.

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United States. Army Aviation Research and Technology Activity. and United States. National Aeronautics and Space Administration., eds. Efficient numerical method for computation of thermohydrodynamics of laminar lubricating films. [Washington, DC]: National Aeronautics and Space Administration, 1990.

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United States. National Aeronautics and Space Administration. and U.S. Army Research Laboratory., eds. An efficient numerical procedure for thermodydrodynamic [sic] analysis of cavitating bearings. [Washington, D.C.]: National Aeronautics and Space Administration, 1995.

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Book chapters on the topic "Hydrodynamic efficiency"

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Kulov, N. N., and Yu N. Lebedev. "Intensive Hydrodynamic Regimes in Absorption Towers and Fractionating Columns." In Energy Efficiency in Process Technology, 339–50. Dordrecht: Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-011-1454-7_31.

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Evans, D. V. "The Hydrodynamic Efficiency of Wave-Energy Devices." In Hydrodynamics of Ocean Wave-Energy Utilization, 1–34. Berlin, Heidelberg: Springer Berlin Heidelberg, 1986. http://dx.doi.org/10.1007/978-3-642-82666-5_1.

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Al-Shaban, K., V. Balasundaram, C. R. Howarth, C. Ramshaw, and J. R. A. Peel. "The Hydrodynamic and Mass Transfer Characteristics of a Large Centrifugal Water Deoxygenator." In Energy Efficiency in Process Technology, 475–84. Dordrecht: Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-011-1454-7_43.

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Ranjan, Sanjeev, Akshay Nitin Dorle, and Pradip Deb Roy. "Analysis of hydrodynamic efficiency on a rectangular based OWC." In Application of Soft Computing Techniques in Mechanical Engineering, 73–85. Boca Raton: CRC Press, 2022. http://dx.doi.org/10.1201/9781003257691-6.

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DosRamos, J. G., R. D. Jenkins, and C. A. Silebi. "Efficiency of Particle Separation in Capillary Hydrodynamic Fractionation (CHDF)." In ACS Symposium Series, 264–78. Washington, DC: American Chemical Society, 1991. http://dx.doi.org/10.1021/bk-1991-0472.ch017.

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Rajwa-Kuligiewicz, Agnieszka, Robert J. Bialik, and Paweł Rowiński. "Experimental Investigations on the Oxygen Transfer Efficiency at Low-Head Hydraulic Structures." In Hydrodynamic and Mass Transport at Freshwater Aquatic Interfaces, 115–27. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-27750-9_10.

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Sabokrouhiyeh, Nima, Andrea Bottacin-Busolin, Heidi Nepf, and Andrea Marion. "Effects of Vegetation Density and Wetland Aspect Ratio Variation on Hydraulic Efficiency of Wetlands." In Hydrodynamic and Mass Transport at Freshwater Aquatic Interfaces, 101–13. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-27750-9_9.

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Sherman, Douglas, Jean Ellis, Jeffrey Hart, and David Hansen. "The Hydrodynamic Efficiency of Non-Traditional Levee Protection Methods in the Sacramento River Delta." In WorldMinds: Geographical Perspectives on 100 Problems, 509–14. Dordrecht: Springer Netherlands, 2004. http://dx.doi.org/10.1007/978-1-4020-2352-1_83.

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da Silva, Breno Farias, Fernando Costa da Cruz, Harlysson Wheiny Silva Maia, Toshi-Ichi Tachibana, Vitor Hugo Macedo Cardoso, and Yuri Victor Remígio Guedes. "Methodology for Improvement of the Hydrodynamic Efficiency of an Amazon School Boat Utilizing a CFD Tool." In Proceedings of the 25th Pan-American Conference of Naval Engineering—COPINAVAL, 93–103. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-89812-4_9.

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Baiteche, Mounir, Hicham Chaouki, Edward Gosselin, Alain Jacques, Houshang Alamdari, and Mario Fafard. "Hydrodynamic and Thermoelectric 3D Mathematical Model of Aluminium Electrolysis Cell to Investigate Slotted Carbon Anode Efficiency." In Light Metals 2017, 1325–31. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-51541-0_158.

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Conference papers on the topic "Hydrodynamic efficiency"

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Savander, Brant R., Malcolm E. Willis, Karl A. Stambaugh, and Kelley A. Cox. "USCG Patrol Craft Hydrodynamic Fuel Efficiency Improvements." In SNAME 13th International Conference on Fast Sea Transportation. SNAME, 2015. http://dx.doi.org/10.5957/fast-2015-035.

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A computational analysis program, conducted at full scale, has been completed on the USCG Fast Response Cutter (FRC) to evaluate how appendage and propeller redesign affects calm water powering performance and erosive cavitation onset. Aft working forward, the geometric variations considered included: addition of a stern flap, wake adapted rudder redesign, propeller design refinement, wake adapted skeg redesign, and redesign of the spray rail system. The first activity was to use a wake alignment procedure to redesign the current rudder in an effort to improve the rudder drag characteristics and minimize or eliminate rudder cavitation. The wake aligned redesign eliminated rudder cavitation over the entire speed range, and decreased total drag by 6% at flank speed. Replacement of only the current rudders with the wake aligned redesign is predicted to increase flank speed from 28.9 knots to 29.4 knots. The stern flap and spray rail efforts followed the historical guidance of similar work performed on the USCG Island Class patrol boats, as documented in Cusanelli and Barry (2002). Following the geometric guidance of the Island Class stern flaps the final recommended stern flap for the FRC results in a brake power demand reduction of 15%. The Island Class achieved a 12% reduction in required brake power at similar speeds. The combination of the new stern flap, wake adapted rudders, current propeller, current skegs, and new spray rail yielded an increase in flank speed from 28.9 to 31.4 knots. Skeg redesign resulted in a 30% decrease in the magnitude of the radiated pressure pulse amplitudes experienced in the propeller tunnel above the propeller. The redesign of the skeg did not affect the propeller behind efficiency. Modification of the current propeller geometry was the final redesign task. The final system, which included the new stern flap, wake aligned rudders, redesigned propeller, wake aligned skegs, and new spray rail system decreased power by 18.6% at the prior 28.9 knot flank speed of FRC. The new flank speed, with the final system, has increased to 32.9 knots in the full load, end of service life condition. The combined effect of all redesign activities reveals an annual fuel consumption savings of 24,000 gallons per vessel per year, which corresponds to a 13.6% savings when compared to the original as-built system. Assuming a fuel cost of $4 per gallon, the annual cost savings per vessel per year equals $96,000. This savings extrapolated over a 58 ship fleet equates to $5.5 million in savings per year for the class. This saving per year yields a savings of $110 million for the 20-year operating life of the 58-ship class.
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Morris-Thomas, M. T., R. Irvin, and K. P. Thiagarajan. "The Hydrodynamic Efficiency of an Oscillating Water Column." In ASME 2005 24th International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2005. http://dx.doi.org/10.1115/omae2005-67371.

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An oscillating water column device enables the conversion of wave energy into electrical energy via wave interaction with a semi-submerged chamber coupled with a turbine for power take off. This present work concentrates on the wave interaction with the semi-submerged chamber, whereby a shore based oscillating water column (OWC) is studied experimentally to examine energy efficiencies for power take-off. The wave environment considered consists of plane progressive waves of steepnesses ranging from kA = 0.01 to 0.22 and water depth ratios varying from kh = 0.30 to 3.72, where k, A and h denote the wave number, wave amplitude and water depth respectively. The key feature of this experimental campaign is a study on the influence of geometrical parameters of the front wall on the OWC’s performance. More specifically, these parameters include: front wall draught; thickness; and aperture shape. We make use of a two-dimensional inviscid theory for an OWC for comparative purposes and to explain trends noted in the experimental measurements. The work undertaken here has revealed a broad banded efficiency centred about the natural frequency of the OWC. The magnitude and shape of the efficiency curves are influenced by the geometry of the front wall. Typical resonant efficiencies of the OWC are in the order of 70%.
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Buttapeng, Chainarong. "Hydrodynamic Efficiency of Ablation Propulsion with Pulsed Ion Beam." In BEAMED ENERGY PROPULSION: Fourth International Symposium on Beamed Energy Propulsion. AIP, 2006. http://dx.doi.org/10.1063/1.2203280.

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Ales, Ronovsky, Vondrak Vit, and Podhoranyi Michal. "Improving efficiency of hydrodynamic modelling using adaptive mesh refinement." In PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON NUMERICAL ANALYSIS AND APPLIED MATHEMATICS 2014 (ICNAAM-2014). AIP Publishing LLC, 2015. http://dx.doi.org/10.1063/1.4913038.

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Carruthers, D., P. S. Ringrose, and P. W. M. Corbett. "The effects of hydrodynamic flows on secondary oil migration efficiency." In 58th EAEG Meeting. Netherlands: EAGE Publications BV, 1996. http://dx.doi.org/10.3997/2214-4609.201408962.

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Harries, S., C. Abt, J. Heiman, and K. Hochkirch. "Advanced Hydrodynamic Design of Container Carriers for Improved Transport Efficiency." In Design & Operation of Container Ships. RINA, 2006. http://dx.doi.org/10.3940/rina.cont.2006.1.

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Kulikov, Igor, Igor Chernykh, Dmitry Karavaev, Anna Sapetina, and Sergey Lomakin. "The Efficiency of Hydrodynamic Code on Intel Xeon Scalable Architecture." In 2021 Ivannikov Memorial Workshop (IVMEM). IEEE, 2021. http://dx.doi.org/10.1109/ivmem53963.2021.00013.

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Wang, Weizhi, Csaba Pákozdi, Arun Kamath, Tobias Martin, and Hans Bihs. "Hydrodynamic Coupling of Viscous and Non-Viscous Numerical Wave Solutions Within the Open-Source Hydrodynamics Framework REEF3D." In ASME 2021 40th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/omae2021-62185.

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Abstract A comprehensive understanding of the marine environment in the offshore area requires phase-resolved wave information. For the far-field wave propagation, computational efficiency is crucial, as large spatial and temporal scales are involved. For the near-field extreme wave events and wave impacts, high resolution is required to resolve the flow details and turbulence. The combined use of a computationally efficient large-scale model and a high-resolution local-scale solver provides a solution the combines accuracy and efficiency. This article introduces a coupling strategy between the efficient fully nonlinear potential flow (FNPF) solver REEF3D::FNPF and the high-fidelity computational fluid dynamics (CFD) model REEF3D::CFD within in the open-source hydrodynamics framework REEF3D. REEF3D::FNPF solves the Laplace equation together with the boundary conditions on a sigma-coordinate. The free surface boundary conditions are discretised using high-order finite difference methods. The Laplace equation for the velocity potential is solved with a conjugated gradient solver preconditioned with geometric multi-grid provided by the open-source library hypre. The model is fully parallelised following the domain decomposition strategy and the MPI protocol. The waves calculated with the FNPF solver are used as wave generation boundary condition for the CFD based numerical wave tank REEF3D::CFD. The CFD model employs an interface capturing two-phase flow approach that can resolve complex wave structure interaction, including breaking wave kinematics and turbulent effects. The presented hydrodynamic coupling strategy is tested for various wave conditions and the accuracy is fully assessed.
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Eremin, Anton Vladimirovich, Sofya Alekseevna Zinina, Andrey Igorevich Popov, Kristina Vladimirovna Gubareva, and Dmitry Mikhailovich Bragin. "Numerical Study of Hydrodynamic Characteristics of Porous Material Based on Schwarz P Surface." In 2021 3rd International Conference on Control Systems, Mathematical Modeling, Automation and Energy Efficiency (SUMMA). IEEE, 2021. http://dx.doi.org/10.1109/summa53307.2021.9632163.

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Kumar, Ranjan. "CFD Investigation of Hydrodynamic Drag and Lift by Surface Dimpling." In SNAME 5th World Maritime Technology Conference. SNAME, 2015. http://dx.doi.org/10.5957/wmtc-2015-198.

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Hydrodynamics plays a significant role in determining the flow over surfaces. This study aims at investigating the hydrodynamics of flow over dimples. Roughness created by the dimples generates favorable pressure gradient for lift generation at the expense of drag which largely consists of pressure drag. The efficiency of dimple is found to be more at the location where boundary separation occurs. The foils were investigated at four different velocities and different angles of attack wherein it was found to improve the stall characteristics marginally. In all, this project identifies if dimples can help achieve better hydrodynamic efficiency of hydrofoils.
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Reports on the topic "Hydrodynamic efficiency"

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Waltz, Jacob I. A new efficient approach for 3D hydrodynamics simulation. Office of Scientific and Technical Information (OSTI), April 2015. http://dx.doi.org/10.2172/1178717.

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Aidun, Cyrus K. Improving paper machine efficiency through on-line control of stock delivery, headbox and forming hydrodynamics. Office of Scientific and Technical Information (OSTI), September 1999. http://dx.doi.org/10.2172/761133.

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Cyrus K. Aidun. Improving paper machine efficiency through on-line control of stock delivery, headbox and forming hydrodynamics. Quarterly report. Office of Scientific and Technical Information (OSTI), February 2000. http://dx.doi.org/10.2172/764760.

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Sforza, P. M., and R. J. Cresci. Fuel efficient hydrodynamic containment for gas core fission reactor rocket propulsion. Final report, September 30, 1992--May 31, 1995. Office of Scientific and Technical Information (OSTI), May 1997. http://dx.doi.org/10.2172/510312.

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Ananthakrishnan, P. Application of Hydrodynamics and Dynamics Models for Efficient Operation of Modular Mini-AUVs in Shallow and Very Shallow Waters. Fort Belvoir, VA: Defense Technical Information Center, September 2003. http://dx.doi.org/10.21236/ada629523.

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Ananthakrishnan, P. Application of Hydrodynamics and Dynamics Models for Efficient Operation of Modular Mini-AUVs in Shallow and Very-Shallow Waters. Fort Belvoir, VA: Defense Technical Information Center, August 2001. http://dx.doi.org/10.21236/ada625409.

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Ananthakrishnan, P. Application of Hydrodynamics and Dynamics Models for Efficient Operation of Modular Mini-AUVs in Shallow and Very-Shallow Waters. Fort Belvoir, VA: Defense Technical Information Center, September 2002. http://dx.doi.org/10.21236/ada627041.

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