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Статті в журналах з теми "Hydrodynamic and biokinetic modeling"

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Huang, Chenfu, Anika Kuczynski, Martin T. Auer, David M. O’Donnell, and Pengfei Xue. "Management Transition to the Great Lakes Nearshore: Insights from Hydrodynamic Modeling." Journal of Marine Science and Engineering 7, no. 5 (May 4, 2019): 129. http://dx.doi.org/10.3390/jmse7050129.

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The emerging shift in Great Lakes management from offshore to nearshore waters will require attention to complexities of coastal hydrodynamics and biogeochemical transformations. Emphasizing hydrodynamics, this work resolves transport processes in quantifying discharge plume and pollutant of concern (POC) footprint dimensions, the latter being the portion of the plume where water quality standards are not met. A generic approach, isolated from pollutant-specific biokinetics, provides first-approximation estimates of the footprint area. A high-resolution, linked hydrodynamic-tracer model is applied at a site in the Greater Toronto Area on Lake Ontario. Model results agree with observed meteorological and hydrodynamic conditions and satisfactorily simulate plume dimensions. Footprints are examined in the context of guidelines for regulatory mixing zone size and attendant loss of beneficial use. We demonstrate that the ratio of the water quality standard to the POC concentration at discharge is a key determinant of footprint dimensions. Footprint size for traditional pollutants (ammonia, total phosphorus) meets regulatory guidelines; however, that for soluble reactive phosphorus, a presently unattended pollutant, is ~1–2 orders of magnitude larger. This suggests that it may be necessary to upgrade treatment technologies to maintain consistency with regulatory guidelines and mitigate manifestations of the eutrophication-related soluble reactive phosphorus POC.
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Ortiz, Antonio, Rubén Díez-Montero, Joan García, Nadeem Khalil, and Enrica Uggetti. "Advanced biokinetic and hydrodynamic modelling to support and optimize the design of full-scale high rate algal ponds." Computational and Structural Biotechnology Journal 20 (2022): 386–98. http://dx.doi.org/10.1016/j.csbj.2021.12.034.

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Zeng, Ming, Audrey Soric, and Nicolas Roche. "Calibration of hydrodynamic behavior and biokinetics for TOC removal modeling in biofilm reactors under different hydraulic conditions." Bioresource Technology 144 (September 2013): 202–9. http://dx.doi.org/10.1016/j.biortech.2013.06.111.

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Xu, Qi, Yanlei Wan, Qiongxiang Wu, Keke Xiao, Wenbo Yu, Sha Liang, Yuwei Zhu, et al. "An efficient hydrodynamic-biokinetic model for the optimization of operational strategy applied in a full-scale oxidation ditch by CFD integrated with ASM2." Water Research 193 (April 2021): 116888. http://dx.doi.org/10.1016/j.watres.2021.116888.

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Boltz, Joshua P., Bruce R. Johnson, Imre Takács, Glen T. Daigger, Eberhard Morgenroth, Doris Brockmann, Róbert Kovács, Jason M. Calhoun, Jean-Marc Choubert, and Nicolas Derlon. "Biofilm carrier migration model describes reactor performance." Water Science and Technology 75, no. 12 (March 17, 2017): 2818–28. http://dx.doi.org/10.2166/wst.2017.160.

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The accuracy of a biofilm reactor model depends on the extent to which physical system conditions (particularly bulk-liquid hydrodynamics and their influence on biofilm dynamics) deviate from the ideal conditions upon which the model is based. It follows that an improved capacity to model a biofilm reactor does not necessarily rely on an improved biofilm model, but does rely on an improved mathematical description of the biofilm reactor and its components. Existing biofilm reactor models typically include a one-dimensional biofilm model, a process (biokinetic and stoichiometric) model, and a continuous flow stirred tank reactor (CFSTR) mass balance that [when organizing CFSTRs in series] creates a pseudo two-dimensional (2-D) model of bulk-liquid hydrodynamics approaching plug flow. In such a biofilm reactor model, the user-defined biofilm area is specified for each CFSTR; thereby, Xcarrier does not exit the boundaries of the CFSTR to which they are assigned or exchange boundaries with other CFSTRs in the series. The error introduced by this pseudo 2-D biofilm reactor modeling approach may adversely affect model results and limit model-user capacity to accurately calibrate a model. This paper presents a new sub-model that describes the migration of Xcarrier and associated biofilms, and evaluates the impact that Xcarrier migration and axial dispersion has on simulated system performance. Relevance of the new biofilm reactor model to engineering situations is discussed by applying it to known biofilm reactor types and operational conditions.
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Yang, Jixiang, Yanqing Yang, Xin Ji, Youpeng Chen, Jinsong Guo, and Fang Fang. "Three-Dimensional Modeling of Hydrodynamics and Biokinetics in EGSB Reactor." Journal of Chemistry 2015 (2015): 1–7. http://dx.doi.org/10.1155/2015/635281.

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A three-dimensional model integrating computational fluid dynamics (CFD) and biokinetics was established to model an expanded granular sludge bed (EGSB) reactor in this study. The EGSB reactor treating synthesized municipal wastewater was operated at ambient temperature. The model provided satisfactory modeling results regarding hydrodynamics and biokinetics. The model shows that influent distribution was evenly distributed. In addition, butyrate and propionate degradation rates linearly decreased along the flow direction in the reactor. However, acetate degradation rate increased first and decreased later. VFA degradation rate distributions were different at each reactor cross section. VFA degradation rates near reactor wall were lower than VFA degradation rates at reactor axis. Moreover, a pulse high influent COD concentration had a tiny impact on effluent quality, which indicates that the reactor was stable while treating synthesized wastewater at adopted conditions.
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Meister, Michael, Daniel Winkler, Massoud Rezavand, and Wolfgang Rauch. "Integrating hydrodynamics and biokinetics in wastewater treatment modelling by using smoothed particle hydrodynamics." Computers & Chemical Engineering 99 (April 2017): 1–12. http://dx.doi.org/10.1016/j.compchemeng.2016.12.020.

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Meister, Michael, and Wolfgang Rauch. "Modelling aerated flows with smoothed particle hydrodynamics." Journal of Hydroinformatics 17, no. 4 (March 9, 2015): 493–504. http://dx.doi.org/10.2166/hydro.2015.132.

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Modelling aerated flows is a complex application of computational fluid dynamics (CFD) since the interfaces between air and water change rapidly. In this work, the simulation of aerated flows with the smoothed particle hydrodynamics (SPH) method is investigated with a focus towards the application in engineering practice. To prove the accuracy of the method, the processes of air entrainment and rising air bubbles are studied. Through monitoring the evolution of the bubble contours it is shown that the novel approach of adding artificial repulsion forces at the interface does not alter the dynamics but stabilizes the flow. Building on these fundamental processes we extend the discussion to practical applications with a special focus on forced aeration. Since the employment of a detailed SPH model to practical problems remains out of bounds due to the high computational demand, we propose a combined experimental and numerical study where experimental bubble characteristics are imposed on the numerical simulation. Based on the data of the conducted bubble column experiment, the computational demand is significantly decreased such that the oxygen consumption due to biokinetic processes can be modelled. The future perspective is to apply SPH to urban water systems, e.g., for simulating detailed processes in wastewater treatment and sewer hydraulics.
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Prades, L., A. D. Dorado, J. Climent, X. Guimerà, S. Chiva, and X. Gamisans. "CFD modeling of a fixed-bed biofilm reactor coupling hydrodynamics and biokinetics." Chemical Engineering Journal 313 (April 2017): 680–92. http://dx.doi.org/10.1016/j.cej.2016.12.107.

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Blaauboer, Bas J. "Biokinetic Modeling andin Vitro–in VivoExtrapolations." Journal of Toxicology and Environmental Health, Part B 13, no. 2-4 (June 17, 2010): 242–52. http://dx.doi.org/10.1080/10937404.2010.483940.

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Дисертації з теми "Hydrodynamic and biokinetic modeling"

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Vink, J. S. "Discussion: Hydrodynamic modeling." Universität Potsdam, 2007. http://opus.kobv.de/ubp/volltexte/2008/1804/.

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Nzokou, Tanekou François. "Ice rupture hydrodynamic modeling." Thesis, Université Laval, 2010. http://www.theses.ulaval.ca/2010/26683/26683.pdf.

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Marchand, Philippe. "Hydrodynamic modeling of shallow basins." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape11/PQDD_0003/MQ44218.pdf.

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Marchand, Philippe 1972. "Hydrodynamic modeling of shallow basins." Thesis, McGill University, 1997. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=20274.

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A two-dimensional hydrodynamic model is used to simulate the flow field and the concentration distribution of a conservative tracer in shallow basins. A series of numerical test are performed to evaluate different numerical schemes and problems which arise for the use of the Second Moment Method (SMM) in diffusion dominated flows are reported. The results of the basin simulations are compared with experimental data. The model predicts the location and the size of the dead zones, bypassing, recirculation, and local concentrations within the basin. The positioning of the inlet and outlet, and the presence of baffles are important parameters for the location and size of dead zones. The model gives results which are in agreement with the experimental data. The results show that the hydrodynamic model is quite powerful in terms of predicting correctly the residence time distribution for ponds of various dimensions and shapes.
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Meakin, Casey Adam. "Hydrodynamic Modeling of Massive Star Interiors." Diss., The University of Arizona, 2006. http://hdl.handle.net/10150/194035.

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In this thesis, the hydrodynamics of massive star interiors are explored. Our primary theoretical tool is multi-dimensional hydrodynamic simulation using realistic initial conditions calculated with the one-dimensional stellar evolution code, TYCHO. The convective shells accompanying oxygen and carbon burning are examined, including models with single as well as multiple, simultaneously burning shells. A convective core during hydrogen burning is also studied in order to test the generality of the flow characteristics. Two and three dimensional models are calculated. We analyze the properties of turbulent convection, the generation of internal waves in stably stratified layers, and the rate and character of compositional mixing at convective boundaries.
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Sherburn, Jesse Andrew. "HYDRODYNAMIC MODELING OF IMPACT CRATERS IN ICE." MSSTATE, 2008. http://sun.library.msstate.edu/ETD-db/theses/available/etd-11052007-091023/.

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In this study, impact craters in water ice are modeled using the hydrodynamic code CTH. In order to capture impact craters in ice an equation of state and a material model are created and validated. The validation of the material model required simulating the Split Pressure Hopkinson Bar (SPHB) experimental apparatus. The SPHB simulation was first compared to experiments completed on Al 6061-T6, then the ice material model was validated. After validation, the cratering simulations modeled known experiments found in the literature. The cratering simulations captured the bulk physical aspects of the experimental craters, and the differences are described. Analysis of the crater simulations showed the damaged volume produced by the projectile was proportional to the projectiles momentum. Also, the identification of four different stages in the crater development of ice (contact and compression, initial damage progression, crater shaping, and ejected damaged material) are described.
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Luca, Liliana. "Hydrodynamic modeling of electron transport in graphene." Doctoral thesis, Università di Catania, 2019. http://hdl.handle.net/10761/4103.

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Semi-classical hydrodynamic models for charge transport in graphene have been presented. They are deduced as moment equations of the semiclassical Boltzmann equation with the needed closure relations obtained by resorting to the Maximum Entropy Principle. The models differ in the choice of the moments to assume as basic field variables. Both linear and nonlinear closure relations are analyzed. The validity of all the semi-classical models presented is assessed by comparing the mean values of energy and velocity with those obtained from the direct solutions of the Boltzmann equation in the simple case of suspended monolayer graphene. It has been found that it is crucial to include- among the field variables- the deviatoric part of the stress tensor to maintain a good accuracy in a wider range of applied electric fields. Moreover apparently the results confirm that the nonlinearity is not critical for accuracy. Then, to take into account quantum phenomena, in the last part of this work a quantum hydrodynamic model for charge transport in graphene is derived from a moment expansion of the Wigner-Boltzmann equation. The needed closure relations are obtained by adding to the semiclassical ones quantum corrections based on the equilibrium Wigner function. The latter is obtained from the Bloch equation by taking into account the appropriate energy band of graphene. Furthermore, quantum energy-transport and drift-diffusion models have been formally derived from the quantum hydrodynamic equations in the long time asymptotic limit. In analogy with the semiclassical case we are confident that the energy-transport and drift-diffusion models have mathematical properties which allow an easier numerical treatment.
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Eriksson, Jonas. "Evaluation of SPH for hydrodynamic modeling,using DualSPHysics." Thesis, Uppsala universitet, Avdelningen för beräkningsvetenskap, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-339557.

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Computational methods are always being invented, improved and adjusted to newkinds of problems, this is a constant process happening all the time. The studyevaluates a method called Smoothed Particle Hydrodynamics (SPH) for modelingon fluid flows around ship hulls. This has been done mainly using a open sourcecode called DualSPHysics. The SPH method has been applied to complex problemsas well as simple problems for comparison to well known phenomena. It is aearly study of the method and aimed at discovering how to proceed when studyingthe method in the future. The results seem promising especially when computationsare made using Graphics Processing Units (GPU) for calculations. The codeDualSPHysics used in the study shows promise but might be in need of some morefunctions before being practically applicable for simulation of ship hulls.
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Esmond, Micah Jeshurun. "Two-dimensional, Hydrodynamic Modeling of Electrothermal Plasma Discharges." Diss., Virginia Tech, 2016. http://hdl.handle.net/10919/81447.

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A two-dimensional, time-dependent model and code have been developed to model electrothermal (ET) plasma discharges. ET plasma discharges are capillary discharges that draw tens of kA of electric current. The current heats the plasma, and the plasma radiates energy to the capillary walls. The capillary walls ablate by melting and vaporizing and by sublimation. The newly developed model and code is called the Three-fluid, 2D Electrothermal Plasma Flow Simulator (THOR). THOR simulates the electron, ion, and neutral species as separate fluids coupled through interaction terms. The two-dimensional modeling capabilities made available in this new code represent a tool for the exploration and analysis of the physics involved in ET plasma discharges that has never before been available. Previous simulation models of ET plasma discharges have relied primarily on a 1D description of the plasma. These models have often had to include a tunable correction factor to account for the vapor shield layer - a layer of cold ablated vapor separating the plasma core from the ablating surface and limiting the radiation heat flux to the capillary wall. Some studies have incorporated a 2D description of the plasma boundary layer and shown that the effects of a vapor shield layer can be modeled using this 2D description. However, these 2D modeling abilities have not been extended to the simulation of pulsed ET plasma discharges. The development of a fully-2D and time-dependent simulation model of an entire ET plasma source has enabled the investigation of the 2D development of the vapor shield layer and direct comparison with experiments. In addition, this model has provided novel insight into the inherently 2D nature of the internal flow characteristics involved within the plasma channel in an ET plasma discharge. The model is also able to capture the effects of inter-species interactions. This work focuses on the development of the THOR model. The model has been implemented using C++ and takes advantage of modern supercomputing resources. The THOR model couples the 2D hydrodynamics and the interactions of the plasma species through joule heating, ionization, recombination, and elastic collisions. The analysis of simulation results focuses on emergent internal flow characteristics, direct simulation of the vapor shield layer, and the investigation of source geometry effects on simulated plasma parameters. The effect of elastic collisions between electrons and heavy species are shown to affect internal flow characteristics and cause the development of back-flow inside the ET plasma source. The development of the vapor shield layer has been captured using the diffusion approximation for radiation heat transfer within the ET plasma source with simulated results matching experimental measurements. The relationship between source radius and peak current density inside ET plasma discharges has also been explored, and the transition away from the ablation-controlled operation of ET plasma discharges has been observed.
Ph. D.
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MEGGIOLARO, MARCO ANTONIO. "HYDRODYNAMIC BEARING MODELING FOR THE SIMULATION OF ROTATING SYSTEMS." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 1996. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=19287@1.

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CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO
Neste trabalho a análise do comportamento de sistemas rotativos do tipo eixo-rotormancal é estendida para incluir os efeitos da presença de mancais hidrodinâmicos na resposta dinâmica. Estes efeitos estão associados à não-linearidade da força de reação exercida pelos suportes sobre o eixo e dependem dos deslocamentos, velocidades transversais e da rotação própia do rotor. A modelagem estrutural do sistema é obtida empregando-se o método dos elementos finitos. O eixo é representado pelo modelo de viga de Timoshenko com dois nós, quatro graus-de-liberdade por nó, e a interpolação do campo de deslocamentos é obtida utilizando-se as funções de Hermite. Os rotores são modelados empregando-se elementos de inércia concentrada associada aos graus-de-liberdade de um ponto nodal do modelo. E, na representação dos mancais hidrodinâmicos utilizou-se a equação de Reynolds, com as hipóteses simplificadoras para mancais curtos, obtendo-se a solução para a distribuição de pressão do filme de óleo em forma fechada. Essa distribuição de pressão permite a obtenção dos coeficientes das matrizes e rigidez e de amortecimento associadas aos graus de liberdade do eixo no ponto nodal de representação do mancal. Para a integração temporal do sistema de equações diferencias utiliza-se o procedimento passo-a-passo, tendo-se implementado os métodos implícitos de Newmark e Wilson – teta, na forma incondicionalmente estável. Devido à não-linearidade das equações obtidas com a presença dos mancais hidrodinâmicos, em cada intervalo de tempo utiliza-se o procedimento de Newton-Raphson modificado para a correção da solução numérica obtida com outros resultados analíticos/numéricos disponíveis na literatura. Também, uma representação numérica para mancais hidrodinâmicos segmentados é apresentada, utilizando-se o desenvolvimento teórico para mancais simples. Neste caso a avaliação do procedimento numérico é fornecida comparando-se a solução numérica com resultados experimentais obtidos dos rotores de usina hidrogenada avaliada pelo CEPEL. Em ambos os procedimentos o rotor idealizado de jeffcott é empregado no estudo de casos. Verifica-se que os principais resultados associados aos efeitos da precessão auto-excitada (oil whirl), de chicoteamento (oil whip), e da estabilização dinâmica do sistema são reproduzidos pelos modelos numéricos utilizados.
In this work a formulation for the analysis of shaft-rotor-bearing type rotating systems is extendend to accommodate the effects of hydrodynamic bearings in its dynamic response. These effects, which are associated to the nonlinear force on the shaft at the bearings, are dependent of the transverse displacements, transverse linear velocities an the angular veolicty of the shaft. The structure behavior is modeled by employing the finite element method. The shaft is represented by the two node timoshenko model for bearns, with four desgrees-of-freedom per node and Hermite interpolation functions to represent the displacement fields along the bearn axis. Rotors are modeled by using concentrated inertia elements associated to the shaft degrees-of-freedom at the bearing nodal point. In the numerical analysis considering the time integration of the system differential equation, a step-by-step procedure was employed with the newmark technique in this unconditionally stable form. Due to the nonlearities associated with the hydrodynamic bearings, the solution of the system of equations is obtained using a modified Newton-Raphson precedure at each time step for solution convergence. In the evaluation of the proposed computacional system, comparison with solutions obtained from analytical/numerical results available in the literature are used. Also, a numeric represemtation of tilting-pad bearings is presented using the theory for plain journal bearings, under the same simplified conditions. In this case an evaluation of the numerical procedure is given by comparing calculated solutions with experimental results obtained from the evaluation of a hydrogenaration plant provided by CEPEL-Brazilian Research Center For Eletrobras. In both plain an tilting-pad journal bearing numerical procedures, the idealized Jeffcott rotor is employed as a case study for different operating conditions. As a result, it is shown that the solutions associated to the main oil whirl and oil whip effects and afterwards dynamic stabilization are represented by the proposed numerical procedures employed.
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Книги з теми "Hydrodynamic and biokinetic modeling"

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Shirer, Hampton N., ed. Nonlinear Hydrodynamic Modeling: A Mathematical Introduction. Berlin, Heidelberg: Springer Berlin Heidelberg, 1987. http://dx.doi.org/10.1007/3-540-17557-1.

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N, Shirer Hampton, ed. Nonlinear hydrodynamic modeling: A mathematical introduction. Berlin: Springer-Verlag, 1987.

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Shirer, Hampton N. Nonlinear Hydrodynamic Modeling: A Mathematical Introduction. Berlin, Heidelberg: Springer Berlin Heidelberg, 1987.

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Constructive modeling of structural turbulence and hydrodynamic instabilities. New Jersey: World Scientific, 2009.

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5

Belot︠s︡erkovskiĭ, O. M. Constructive modeling of structural turbulence and hydrodynamic instabilities. New Jersey: World Scientific, 2009.

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Belot͡serkovskiĭ, O. M. Constructive modeling of structural turbulence and hydrodynamic instabilities. New Jersey: World Scientific, 2009.

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Geiger, Sam R. Hydrodynamic modeling of towed buoyant submarine antenna's in multidirectional seas. Springfield, Va: Available from National Technical Information Service, 2000.

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Peng, Jian. An integrated geochemical and hydrodynamic model for tidal coastal environments. Los Angeles, CA: University of Southern California, 2006.

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Measurement of soil-borne lead bioavailability in human adults, and its application in biokinetic modeling. [New York]: [Columbia University], 1998.

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Rahmani, M. Hydrodynamic modeling of corrosion of carbon steels and cast irons in sulfuric acid. Houston, TX: Published for the Materials Technology Institute of the Chemical Process Industries by the National Association of Corrosion Engineers, 1992.

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Частини книг з теми "Hydrodynamic and biokinetic modeling"

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Hargrove, James L. "The Biokinetic Database." In Dynamic Modeling in the Health Sciences, 270–75. New York, NY: Springer New York, 1998. http://dx.doi.org/10.1007/978-1-4612-1644-5_26.

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Sinclair, Jennifer L. "Hydrodynamic modeling." In Circulating Fluidized Beds, 149–80. Dordrecht: Springer Netherlands, 1997. http://dx.doi.org/10.1007/978-94-009-0095-0_5.

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Ursegov, Stanislav, and Armen Zakharian. "Adaptive Hydrodynamic Modeling." In Adaptive Approach to Petroleum Reservoir Simulation, 51–60. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-67474-8_6.

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Hagler, Gina. "Hydrodynamic Theorists." In Modeling Ships and Space Craft, 65–83. New York, NY: Springer New York, 2012. http://dx.doi.org/10.1007/978-1-4614-4596-8_4.

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Tannenbaum, Lawrence V. "Validate Biokinetic Uptake Modeling for Freshwater Fish." In Ecological Risk Assessment, 91–96. Boca Raton : Taylor & Francis, 2017.: CRC Press, 2017. http://dx.doi.org/10.1201/9781351261289-14.

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Richards, R. G., and D. G. Torr. "Hydrodynamic models of the plasmasphere." In Modeling Magnetospheric Plasma, 67–77. Washington, D. C.: American Geophysical Union, 1988. http://dx.doi.org/10.1029/gm044p0067.

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Yoshizawa, Akira. "Conventional Turbulence Modeling." In Hydrodynamic and Magnetohydrodynamic Turbulent Flows, 83–144. Dordrecht: Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-017-1810-3_4.

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Yoshizawa, Akira. "Subgrid-Scale Modeling." In Hydrodynamic and Magnetohydrodynamic Turbulent Flows, 145–72. Dordrecht: Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-017-1810-3_5.

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Yoshizawa, Akira. "Compressible Turbulence Modeling." In Hydrodynamic and Magnetohydrodynamic Turbulent Flows, 265–303. Dordrecht: Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-017-1810-3_8.

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Yoshizawa, Akira. "Magnetohydrodynamic Turbulence Modeling." In Hydrodynamic and Magnetohydrodynamic Turbulent Flows, 305–69. Dordrecht: Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-017-1810-3_9.

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Тези доповідей конференцій з теми "Hydrodynamic and biokinetic modeling"

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Harries, Stefan, Claus Abt, and Hochkirch Hochkirch. "Hydrodynamic Modeling of Sailing Yachts." In SNAME 15th Chesapeake Sailing Yacht Symposium. SNAME, 2001. http://dx.doi.org/10.5957/csys-2001-005.

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Анотація:
In modem yacht design geometric modeling is regarded to be directly related to the hydrodynamic performance of the shape of the hull and its appending elements -usually the keel, often with winglets, and the rudder. While the traditional way of shape design - i.e., draw­ing, model building, tank testing, modifying . - is both time consuming and expensive, a complementing ap­proach shall be discussed within this paper. The ap­proach is called hydrodynamic modeling since it tightly combines the hydrodynamic analysis and the geomet­ric modeling in the design process. It is based on ad­vanced Computational Fluid Dynamics (CFD) methods for flow field analysis and unique parametric modeling techniques for shape generation. The geometry of a yacht is entirely described via im­portant form parameters as discussed in detail by the authors at the 1999 CSYS. The canoe body of the yacht is modeled from a small set of longitudinal curves which provide all parameters needed for sectional design. The longitudinal curves themselves being created via form parameters, a fully parametric description of the hull is achieved which allows to create and modify the geom­etry in a highly sophisticated manner. The fairness of the shapes is an intrinsic part of the form generation procedure. Apart from the canoe body the keel repre­sents the most pronounced hydrodynamic design ele­ment, dominating lift and righting moment of a yacht but also causing a non-negligible resistance component called induced drag. Keel, bulb and winglets are also specified in terms of form parameters. An application of hydrodynamic modeling is given for an IACC-yacht. Formal optimization can be suc­cessfully employed to identify improved and, eventu­ally, optimal configurations. A reasonably small set of parameters (free variables) was selected and systemati­cally varied making use of a fully automatic optimiza­tion scheme. Two optimization examples are presented in order to demonstrate the potential of the approach: (a) the optimization of a keel-bulb-winglet configuration so as to find a minimum drag solution for a given side force and (b) the optimization of the bare hull with respect to wave resistance. The examples can be regarded as representative for both racing and touring yachts with draft restrictions and illustrate the methodology of hydrodynamic modeling.
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Tamsalu, R., S. Ovsienko, and V. Zalesny. "Hydrodynamic-oil spill modeling forecasting system." In 2008 IEEE/OES US/EU-Baltic International Symposium (BALTIC). IEEE, 2008. http://dx.doi.org/10.1109/baltic.2008.4625528.

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Xu, Aiguo, Yudong Zhang, Feng Chen, Yanbiao Gan, Huilin Lai, and Chuandong Lin. "Discrete Boltzmann Modeling of Hydrodynamic Instability." In Proceedings of the 32nd International Symposium on Shock Waves (ISSW32 2019). Singapore: Research Publishing Services, 2019. http://dx.doi.org/10.3850/978-981-11-2730-4_0042-cd.

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Liu, Yun, and Hong-da Shi. "Hydrodynamic Modeling of Port Container Logistics." In First International Conference on Transportation Engineering. Reston, VA: American Society of Civil Engineers, 2007. http://dx.doi.org/10.1061/40932(246)206.

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Wang, Lu, Jason Jonkman, Greg Hayman, Andy Platt, Bonnie Jonkman, and Amy Robertson. "Recent Hydrodynamic Modeling Enhancements in OpenFAST." In ASME 2022 4th International Offshore Wind Technical Conference. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/iowtc2022-98094.

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Abstract To improve the hydrodynamic modeling capabilities of the offshore wind design and modeling tool OpenFAST, a restructuring of the HydroDyn hydrodynamics module was undertaken with several new features implemented. The generation of the wave field is now separated from HydroDyn into a new module called SeaState. Unlike previous versions of HydroDyn, which precomputed the wave kinematics at the undisplaced positions of the hydrodynamic nodes, the new SeaState module computes the complete time history of the wave field at the vertices of a user-defined wave grid. During the simulation, the wave kinematics at any point within the grid can be efficiently interpolated, allowing the strip-theory wave loads to be evaluated based on the wave kinematics at the displaced structure position. A phase correction was also implemented for the potential-flow wave-exciting loads to account for large structure displacements. Several wave-stretching methods were implemented for the strip-theory solution along with a wave-load redistribution method that ensures smooth variation of the nodal loads as the nodes of a discrete hydrodynamic mesh enter and exit the water. The load smoothing is included to avoid the excitation of unphysical high-frequency structural vibration during hydroelastic simulations. The MacCamy-Fuchs diffraction correction for the strip-theory solution and the capability to insert a constrained NewWave into extreme stochastic sea states with directional spreading were also added. The present article documents the formulations of the new improvements to HydroDyn with example applications and numerical results.
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Narozhny, Boris. "Hydrodynamic approach to electronic transport." In LOW-DIMENSIONAL MATERIALS: THEORY, MODELING, EXPERIMENT, DUBNA 2021. AIP Publishing, 2022. http://dx.doi.org/10.1063/5.0098950.

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de Soria, María Isabel García, Pablo Maynar, Gregory Schehr, Alain Barrat, Emmanuel Trizac, Joaquín Marro, Pedro L. Garrido, and Pablo I. Hurtado. "Hydrodynamic description for ballistic annihilation systems." In MODELING AND SIMULATION OF NEW MATERIALS: Proceedings of Modeling and Simulation of New Materials: Tenth Granada Lectures. AIP, 2009. http://dx.doi.org/10.1063/1.3082280.

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Bennecib, N., D. Kerdoun, and M. Madaci. "Modeling of a magneto-hydrodynamic DC pump." In 2013 International Conference on Technological Advances in Electrical, Electronics and Computer Engineering (TAEECE). IEEE, 2013. http://dx.doi.org/10.1109/taeece.2013.6557344.

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Liu, Xiyan, Xulong Yuan, Kai Luo, Cheng Chen, and Xiaobin Qi. "Hydrodynamic Force Modeling of an Irregular Body." In OCEANS 2018 MTS/IEEE Charleston. IEEE, 2018. http://dx.doi.org/10.1109/oceans.2018.8604618.

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Doiphode, P. "Magneto-hydrodynamic modeling of gas discharge switches." In BEAMS 2002: 14th International Conference on High-Power Particle Beams. AIP, 2002. http://dx.doi.org/10.1063/1.1530898.

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Звіти організацій з теми "Hydrodynamic and biokinetic modeling"

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Walker, David T., Ales Alajbegovic, and Jason D. Hunt. Hydrodynamic Modeling for Stationary Breaking Waves. Fort Belvoir, VA: Defense Technical Information Center, August 2004. http://dx.doi.org/10.21236/ada427960.

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Wang, P. F., C. N. Katz, D. B. Chadwick, and R. Barua. Hydrodynamic Modeling of Diego Garcia Lagoon. Fort Belvoir, VA: Defense Technical Information Center, August 2014. http://dx.doi.org/10.21236/ada611456.

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Knight, Earl E., and Esteban Rougier. Current SPE Hydrodynamic Modeling and Path Forward. Office of Scientific and Technical Information (OSTI), August 2012. http://dx.doi.org/10.2172/1048858.

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Leggett, Richard Wayne, Keith F. Eckerman, Wilson McGinn, and Dr Robert A. Meck. Controlling intake of uranium in the workplace: Applications of biokinetic modeling and occupational monitoring data. Office of Scientific and Technical Information (OSTI), January 2012. http://dx.doi.org/10.2172/1034382.

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Clark, D. S. Modeling Hydrodynamic Instabilities and Mix in National Ignition Facility Hohlraums. Office of Scientific and Technical Information (OSTI), October 2019. http://dx.doi.org/10.2172/1572235.

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Rocheleau, Greg. Predicting Performance of Macroalgae Farms with Hydrodynamic and Biological Modeling. Office of Scientific and Technical Information (OSTI), February 2022. http://dx.doi.org/10.2172/1846625.

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Dieffenbach, Payson Coy, and Joshua Eugene Coleman. Diagnostic development and hydrodynamic modeling of warm dense plasmas at DARHT. Office of Scientific and Technical Information (OSTI), August 2018. http://dx.doi.org/10.2172/1467297.

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Lackey, Tahirih, Susan Bailey, Joseph Gailani, Sung-Chan Kim, and Paul Schroeder. Hydrodynamic and sediment transport modeling for James River dredged material management. Engineer Research and Development Center (U.S.), September 2020. http://dx.doi.org/10.21079/11681/38255.

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Yang, Zhaoqing, and Taiping Wang. Hydrodynamic Modeling Analysis of Union Slough Restoration Project in Snohomish River, Washington. Office of Scientific and Technical Information (OSTI), December 2010. http://dx.doi.org/10.2172/1004544.

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Coffing, Shane. Modeling Hydrodynamic Instabilities, Shocks, and Radiation Waves in High Energy Density Experiments. Office of Scientific and Technical Information (OSTI), January 2023. http://dx.doi.org/10.2172/1922742.

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