Wyniki wyszukiwania - Biblioteka Nauki

1

Activation of the operational ecohydrodynamic model (3D CEMBS) : the hydrodynamic part

100%

Dzierzbicka-Głowacka L. , Jakacki J. , Nowicki A. , Janecki M.

Oceanologia

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2013

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tom No. 55 (3)

519--541

EN

The paper describes the hydrodynamic part of the coupled ice-ocean model that also includes the ecosystem predictive model. The Baltic Sea model is based on the Community Earth System Model (CESM from NCAR – National Centre for Atmospheric Research). CESM was adopted for the Baltic Sea as a coupled sea-ice model. It consists of the Community Ice CodE (CICE, model version 4.0) and the Parallel Ocean Program (POP, version 2.1). The models are linked through a coupler (CPL7), which is based on the Model Coupling Toolkit (MCT) library. The current horizontal resolution is about 2 km (1/48 degrees). The ocean model has 21 vertical levels and is forced by atmospheric fields from the European Centre for Medium Weather Forecast (ECMWF). A preliminary validation of the hydrodynamic module with in situ measurements and reanalysis from My Ocean (http://www.myocean.eu) has also been done. In the operational mode, 48-hour atmospheric forecasts provided by the UM model from the Interdisciplinary Centre for Mathematical and Computational Modelling of Warsaw University (ICM) are used. The variables presented on the website in real time for a 48-hour forecast are temperature, salinity, currents, sea surface height, ice thickness and ice coverage (http://deep.iopan.gda.pl/CEMBaltic/new_lay/index.php). The embedded model of the marine ecosystem, like ice, is not taken into account in this paper.

2

Effect of hadronic rescattering on the elliptic flow after the hydrodynamics model

100%

Ma G. , Ma Y. , Sa B. , Cai X. , He Z. , Huang H. , Long J. , Shen W. , Zhong C. , Chen J. , Zuo J. , Zhang S. , Shi X.

Nukleonika

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2006

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tom Vol. 51,suppl.3

21-27

EN

Abstract A hydrodynamics + hadronic rescattering model is used to simulate Au+Au collisions at 200 GeV and a Cooper-Frye method is adopted for hadronization. The effect of hadronic rescattering on elliptic flow V2 in 20 40% Au+Au collisions at 200 GeV has been investigated. It is found that the hadronic rescattering can suppress elliptic flow V2 and makes an asymmetric system in momentum space tend to be less anisotropic. The suppression effect becomes weak with increasing transverse momentum. In addition, the effect of hadronic rescattering on transverse momentum spectra and anisotropy of hadronic coordinate space is presented.

3

O skorosti dvizhenija separiruemojj zernosmesi v cilindricheskom vibroreshete

100%

Olshanskijj V. , Olshanskijj A. , Slipchenko M. , Kharchenko S.

Motrol. Motoryzacja i Energetyka Rolnictwa

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2016

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tom 18

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nr 7

4

Hydrodynamics of liquid flow in disk turbines

100%

Szulc K. , Kuncewicz C.

Mechanics and Mechanical Engineering

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2000

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tom Vol. 4, nr 1

97--104

EN

An attempt to adopt a hydrodynamic model developed for pitched-blade turbines to disk turbines operating in a laminar regime has been made. On the basis on computer simulations and experimental data it was found that the model could be applied successfully in the modelling of disk turbines.

5

Analyzing nonlocal effects in the plasmon spectra of a metal slab by the Green’s function technique for hydrodynamic model

100%

Kang N. , Miškovic Z. L. , Zhang Y.-Y. , Song Y.-H. , Wang Y.-N.

Nanoscale Systems: Mathematical Modeling, Theory and Applications

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2014

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tom 3

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nr 1

EN

We study the dynamic response of a metal slab containing electron gas described by the hydrodynamic model with dispersion. The resulting wave equation for the perturbed electron density is solved by means of the Green’s function that satisfies Neumann boundary conditions at the endpoints of the slab. This solution is coupled with the electrostatic potential, which is expressed in terms of the Green’s function for the Poisson equation for a layered structure consisting of three dielectric regions. As an illustration, a set of dispersion relations for eigenfrequencies is deduced for the plasma oscillations in the electron gas, corresponding to both the surface and the bulk modes of even and odd symmetry with respect to the center of the metal slab.

6

Investigating prediction performance of an artificial neural network and a numerical model of the tidal signal at Puerto Belgrano, Bahia Blanca Estuary (Argentina)

100%

Pierini J. , Lovallo M. , Telesca L. , Gómez E.

Acta Geophysica

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2013

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tom Vol. 61, no. 6

1522--1537

EN

In the present study we compare performances of the prediction of hourly tidal level variations at Puerto Belgrano, a coastal site in the Bahia Blanca Estuary (Argentina), by means of the MOHID model, which is a numerical model designed for coastal and estuarine shallow water applications, and of an artificial neural network (ANN). It was shown that the ANN model is able to predict the hourly tidal levels over long term duration with at least seven days of observations and with a better performance in respect to the numerical model. Our findings can be useful to implement ANN-based tools for future studies of the hydrodynamics of Bahía Blanca estuary.

7

The automatic collision avoiding plan research of given way vessel in crossing situation

88%

Hu W. , He Y.

Polish Maritime Research

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2018

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tom S 2

12--16

EN

This paper aims to the computing model of quantitative elements in crossing situation based on the separating of different states about vessel’s meeting to study the automatic collision-avoiding plan of given way vessel in crossing situation. Following results are proved by simulations: The accuracy of hydrodynamic model is enough for studying and application for automatic collision-avoiding; computing model of quantitative elements by method of bisection is rapidly and reliably convergent during computing. The whole meeting process can be separated to several stages according to the quantitative elements in crossing situation. Different initial collision avoiding measures of given-way vessel in different stages produced as per rules and ordinary practice of seaman.

8

Modeling the buoyancy-driven Black Sea Water outflow into the North Aegean Sea

88%

Kokkos N. , Sylaios G.

Oceanologia

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2016

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tom No. 58 (2)

103--116

EN

A three-dimensional numerical model was applied to simulate the Black Sea Water (BSW) outflux and spreading over the North Aegean Sea, and its impact on circulation and stratification–mixing dynamics. Model results were validated against satellite-derived sea surface temperature and in-situ temperature and salinity profiles. Further, the model results were post-processed in terms of the potential energy anomaly, ϕ, analyzing the factors contributing to its change. It occurs that BSW contributes significantly on the Thracian Sea water column stratification, but its signal reduces in the rest of the North Aegean Sea. The BSW buoyancy flux contributed to the change of ϕ in the Thracian Sea by 1.23 × 10-3 W m-3 in the winter and 7.9 × 10-4 W m-3 in the summer, significantly higher than the corresponding solar heat flux contribution (1.41 × 10-5 W m-3 and 7.4 × 10-5 W m-3, respectively). Quantification of the ϕ-advective term crossing the north-western BSW branch (to the north of Lemnos Island), depicted a strong non-linear relation to the relative vorticity of Samothraki Anticyclone. Similar analysis for the south-western branch illustrated a relationship between the ϕ-advective term sign and the relative vorticity in the Sporades system. The ϕ-mixing term increases its significance under strong winds (> 15 m s-1), tending to destroy surface meso-scale eddies.

9

eBalticGrid – an interactive platform for the visualisation of results from a high-resolution operational Baltic Sea model

88%

Jakacki J. , Przyborska A. , Nowicki A. , Wichorowski M. , Przyborski M. , Białoskórski M. , Sochacki C. , Tylman R.

Meteorology Hydrology and Water Management. Research and Operational Applications

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2017

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tom Vol. 5, Iss. 2

13--20

EN

In recent years, modelling has been one of the fastest growing fields of science. Ocean, ice and atmospheric models have become a powerful tool that has supported many scientific fields during the last few decades. Our work presents the new operational service – called eBalticGrid – implemented into the PLGrid Infrastructure (Dziekoński et al. 2014). The grid is based on three modelling tools – an ocean model (Parallel Ocean Program), an ice model (Community Ice Code) and an atmospheric model (Whether Research and Forecasting Model). The service provides access to 72-hour forecasts for the Baltic Sea area. It includes the physical state of the Baltic Sea, its ice cover and the main atmospheric fields, which are the key drivers of the Baltic’s physical state. Unlike other services, this provides the additional three-dimensional fields of temperature, salinity and currents in the Baltic Sea. The models work in operational mode and currently one simulation per day is run. The service has been implemented mostly for researchers. Access to the results does not require any modelling knowledge. Therefore, the main interface between a user and the model results was designed as a portal providing easy access to the model’s output. It will also be a very suitable tool for teaching students about the hydrology of the Baltic Sea. Data from the system are delivered to another operational system – SatBaltic (Woźniak et al. 2011). The development of an output format to be suitable for navigational software (GRIB files) and sharing via FTP is also planned.

10

Hydrodynamic model of the srim-process and its verification

88%

Polushkin E. , Kuznetsov V. , Polushkina O. , Malkin A. Y. , Kleba I. , Blaurock J. , Michaeli W.

Applied Mechanics and Engineering

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1999

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tom Vol. 4, no spec.

297-302

EN

A two-dimentional hydrodynamic model of a rheokinetic fluid during filling a thin and long mold packed with reinforcement materials are proposed. A core layer of the mold is a porous and rather thick spacer mat. The location of other denser and thinner reinforcement materials into the mold was symmetrical with respect to the spacer mat. During mold filling the fluid easily flows along the core spacer mat and simultaneously impregnates the peripheral reinforcement mats. The model allows to simulate the flow front propagation of the fluid and pressure rise inside the mold during filling. In order to verify the model an original glass mold has been designed and built. The experimental results for the flow front propagation of the fluid were compared with the model predictions and a good coincidence between them has been obtained. For correct comparison of the experimental pressure profiles with the calculated data, the pressure losses in the mold gate must be taken into consideration. These losses can essentially exceed the pressure level into the mold.

11

The hydrodynamical model of sedimentation process of suspended load in storage reservoir

88%

Nachlik E. , Kowalska W. , Prystaj A.

Zeszyty Naukowe Akademii Rolniczej we Wrocławiu. Melioracja

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1988

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nr 31

12

On kinetic Boltzmann equations and related hydrodynamic flows with dry viscosity

88%

Bogoliubov N. N. J. , Blackmore D. L. , Somoylenko V. H. , Prykarpatsky A. K.

Opuscula Mathematica

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2007

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tom Vol. 27, no. 2

187-195

EN

A two-component particle model of Boltzmann-Vlasov type kinetic equations in the form of special nonlinear integro-differential hydrodynamic systems on an infinite-dimensional functional manifold is discussed. We show that such systems are naturally connected with the nonlinear kinetic Boltzmann-Vlasov equations for some one-dimensional particle flows with pointwise interaction potential between particles. A new type of hydrodynamic two-component Benney equations is constructed and their Hamiltonian structure is analyzed.

13

Ocena przepustowości Wrocławskiego Węzła Wodnego przed i po modernizacji

75%

Banasiak R.

Gospodarka Wodna

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2018

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tom Nr 2

44--50

PL

Katastrofalna powódź w dorzeczu Odry w 1997 r. spowodowała działania mające za cel poprawę bezpieczeństwa powodziowego górnej i środkowej Odry. Wraz z budową zbiornika retencyjnego Racibórz głównym elementem zabezpieczenia Wrocławia stała się modernizacja Wrocławskiego Węzła Wodnego. Artykuł przedstawia symulacje przepustowości węzła przed i po zrealizowaniu inwestycji z wykorzystaniem hydrodynamicznych modeli dwuwymiarowych. Wyniki obliczeń dla wody kontrolnej Qk = 3100 m3 /s pozwalają na porównawczą ocenę wpływu przedsięwzięć inwestycyjnych na rzędne zwierciadła wody i rozdział przepływów. Zweryfikowano przy tym hydrauliczne założenia projektowe oparte na modelowaniu jednowymiarowym.

EN

The 1997 catastrophic flood in the Oder River basin led to activities aiming at improvement of the flood safety in the upper and lower Oder River section. Together with construction of the Racibórz retention reservoir, the main element of the Wrocław protection became the modernisation of the Wrocław Water Node. The article presents simulation of the node’s flow capacity before and after completion of the investment with the use of hydrodynamic two-dimensional models. The results of calculations for the control water Qk = 3100 m3 /s enable comparative assessment of the investment's impact on the water table ordinates and flow distribution. The analysis verified also the hydraulic project assumptions based on one-dimensional modelling.

14

Uzyskanie na Odrze granicznej klasy żeglowności Va - budowa modelu hydrodynamicznego

75%

Ewertowski R. , Dybkowska-Stefek D. , Relisko-Rybak J.

Gospodarka Wodna

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2018

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tom Nr 12

365--371

PL

W artykule przedstawiono etap przygotowawczy do przeprowadzenia analiz i wskazania rozwiązań umożliwiających uzyskanie na Odrze granicznej klasy żeglowności Va. Prace polegały na budowie modelu hydrodynamicznego tego odcinka Odrzańskiej Drogi Wodnej przy wykorzystaniu najnowszego środowiska modelowego HEC-RAS. Model hydrodynamiczny Odry granicznej stanowią dwa osobne submodele, powiązane warunkami brzegowymi w węźle wodnym ujścia Warty. Pierwszy submodel, o akronimie Odra_T0, obejmuje odcinek Odry od ujścia Warty do rozdziału na Odrę Wschodnią i Zachodnią poniżej przekroju Widuchowa. Drugi, Odra_T1-K, zawiera odcinek tej rzeki pomiędzy ujściem Nysy Łużyckiej a ujściem Warty, z uwzględnieniem kanału ulgi Kietz. Budowę obu submodeli oparto na zbiorze dostępnych danych GIS w zakresie topografii rzeki, na numerycznym modelu terenu opisującym morfologię dna rzeki i jej doliny zalewowej oraz na zbiorze cyfrowych przekrojów sondażowych. W artykule przedstawiono także proces kalibracji obu submodeli i ocenę odtwarzania sytuacji rzeczywistych dla batymetrii istniejącej, aby potwierdzić poprawność ich działania i możliwości realizacji za ich pomocą obliczeń dla różnych scenariuszy poprawy żeglowności Odry granicznej.

EN

The article presents the preparatory stage of analyses and indication of solutions allowing the border Oder River to be granted the Va navigation class. The works consisted in elaboration of a hydrodynamic model of this section of the Oder Waterway with the use of the state-of-the-art HEC-RAS modelling environment. The Oder hydrodynamic model is composed of two separate submodels, related to the bank conditions in the Warta River mouth water node. The first submodel, referred to as Odra-T0, covers the Oder section from the Warta mouth to the conjunction of the Eastern Oder and the Western Oder, downstream of the Widuchowa cross-section. The other, referred to as Odra_T1-K, includes the section of the river between the Nysa Łużycka mouth and the Warta mouth, including the Kietz flood relief channel. The construction of both submodels was based on the data available in the GIS database in the scope of the river topography, numerical model illustrating the river bottom morphology and its flood valley, as well as on the set of digital cross-sections. The article also presents the process of calibration of both submodels, as well as an assessment of recreation of real-life situations for the existing bathymetry, in order to confirm the correctness of their operation and possibility to use them in calculations of different scenarios for improvement of the border Oder navigability.

15

Optimizing the parameters of the simplified hydrodynamic model using genetic algorithms for the prediction marine systems use

75%

Marcjan K. , Gucma L.

Zeszyty Naukowe / Akademia Morska w Szczecinie

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2010

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tom nr 20 (92)

87-91

EN

The paper presents investigations concerning the implementation of a prediction system based on hydrodynamic model, capable to find parameters of the simplified hydrodynamic Nomoto model (1st - order). Optimization of Nomoto model parameters is based on extrapolation of the position, using genetic algorithm and Newton's method.

PL

W artykule przedstawiono badania nad wykonaniem systemu predykcji opartym na modelu hydrodynamicznym, zdolnym do znalezienia parametrów uproszczonego modelu hydrodynamicznego Nomoto pierwszego rzędu. Optymalizacja parametrów modelu Nomoto odbywa się na podstawie ekstrapolacji pozycji za pomocą algorytmu genetycznego oraz metody Newtona.

16

Wpływ parametrów konstrukcyjnych na pracę aparatu fontannowego z centralną rurą wznoszącą

75%

Ludwig W. , Kmieć A.

Inżynieria Chemiczna i Procesowa

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2001

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tom T. 22, z. 3D

881--886

PL

W artykule przedstawiono wyniki symulacji wpływu parametrów konstrukcyjnych na pracę aparatu fontannowego z centralną rurą wznoszącą. Na podstawie własnego modelu hydrodynamicznego przeanalizowano zależność między podstawowym parametrem ważnym z punktu widzenia projektanta jakim jest prędkość cyrkulacji a następującymi zmiennymi konstrukcyjnymi: odległość pomiędzy wlotem do aparatu a rurą wznoszącą średnica rury wznoszącej, długość rury wznoszącej.

EN

This paper presents results of the simulation of the influence of construction parameters on functioning of a spouted bed apparatus with a draft tube. Using our own hydrodynamic model, we analysed the relation between the basic design parameter, which is the circulation rate, and the following construction parameters: length of the entrainment zone, diameter and length of the draft tube.

17

Modeling the buoyancy-driven Black Sea water outflow into the North Aegean Sea

75%

Kokkos N. , Sylaios G.

Oceanologia

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2016

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tom 58

|

nr 2

18

Attributing mean circulation patterns to physical phenomena in the Gulf of Finland

75%

Westerlund A. , Tuomi L. , Alenius P. , Miettunen E. , Vankevich R. E.

Oceanologia

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2018

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tom 60

|

nr 1

EN

We studied circulation patterns in the Gulf of Finland, an estuary-like sub-basin of the Baltic Sea. According to previous observations and model results, the long-term mean circulation in the gulf is cyclonic and mainly density driven, whereas short-term circulation patterns are wind driven. We used the high-resolution 3D hydrodynamic model NEMO to simulate the years 2012–2014. Our aim was to investigate the role of some key features, like river runoff and occasional events, in the formation of the circulation patterns. Our results show that many of the differences visible in the annual mean circulation patterns from one year to another are caused by a relatively small number of high current speed events. These events seem to be upwelling-related coastal jets. Although the Gulf of Finland receives large amounts of fresh water in river runoffs, the inter-annual variations in runoff did not explain the variations in the mean circulation patterns.

19

Efektywność modeli hydrodynamicznych w ocenie dynamiki zbiornika zaporowego

75%

Hachaj P. , Lewicki L. , Nachlik E. , Siuta T.

Gospodarka Wodna

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2014

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tom Nr 8

286--288

PL

Przedmiotem publikacji jest wieloaspektowe, ale zintegrowane podejście do modelowania dynamiki zbiornika zaporowego; celem jest aplikacja i wykorzystanie złożonego - hydrodynamicznego modelu akwenu w budowie scenariuszy zarządzania wielozadaniowym zbiornikiem retencyjnym z uwzględnieniem wymagań środowiskowych. Podejście uwzględnia złożoną strukturę czaszy zbiornika oraz zróżnicowaną dokładność odwzorowania w czasie i przestrzeni parametrów dynamicznych akwenu, dostosowanych do realnych warunków akwenu. Miarą efektywności modelu jest możliwość jego wykorzystania w ocenie i prognozie procesów transportu oraz wymiany masy na potrzeby oceny alokacji osadów i zanieczyszczeń, a także w sterowaniu falą powodziową do ochrony terenów niżej położonych. Obszarem aplikacji modelu jest zbiornik wodny Goczałkowice na Małej Wiśle.

EN

The article is devoted to a multi-aspect but integrated approach to modelling of the dammed reservoir dynamics; the goal is to apply and use a complex, hydrodynamic model of the water body in elaboration of multitask retention reservoir management scenarios, taking into consideration environmental requirements. The approach takes into account the complex structure of the reservoir's bowl and varied precision of the water body dynamic parameters mapping in time and in space, adapted to the actual conditions of the reservoir. The measure of the model's effectiveness is the possibility to use it in assessment and prognostication of the mass transport and exchange processes for the purposes of the deposits and pollutions allocation evaluation, as well as in controlling of flood waves in order to protect areas located downstream. The area of the model application is the Goczałkowice reservoir on the Mała Wisła river.

20

Praktyczna realizacja modelu hydrodynamicznego sieci kanalizacyjnej w pakiecie SewerPac

75%

Licznar P.

Gaz, Woda i Technika Sanitarna

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2008

|

tom Nr 3

11-19

EN

Thermodynamic flow model as a necessary tool in hydraulic analysis of generał fluming and precipitation sewage treatrnent systems wor-king. Review ofcornputer hydrodynamic models. Example simulation of sewage system working in SewerPac pack.