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Wyświetlanie 1-15 z 275
Tytuł:
Influence of initial water saturation in earthen levees on results of numerical modelling of infiltration processes
Autorzy:
Dwornik, M.
Franczyk, A.
Leśniak, A.
Krawiec, K.
Powiązania:
https://bibliotekanauki.pl/articles/305671.pdf
Data publikacji:
2017
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
water saturation
numerical modeling
levee
Opis:
Levees in Poland are mostly earthen constructions. The stability of earthen levees depends largely on factors such as the construction material, meteorological conditions and natural elements. The influence of initial water saturation of pore space on levee stability is analysed in this paper. Analysis was performed using numerical modelling and water pore pressure results were compared against data obtained from sensors located in a levee. The numerical modelling shows the moderate influence of initial water level on distribution of water pore pressure during high water level.
Źródło:
Computer Science; 2017, 18 (4); 413-427
1508-2806
2300-7036
Pojawia się w:
Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical modeling of ultrasound-induced temperature fields in multilayer nonlinear attenuating media
Autorzy:
Kujawska, T.
Wójcik, J.
Nowicki, A.
Powiązania:
https://bibliotekanauki.pl/articles/332786.pdf
Data publikacji:
2009
Wydawca:
Polskie Towarzystwo Akustyczne
Tematy:
numerical modeling
ultrasound
attenuating media
Opis:
Ultrasound is a safe, convenient and inexpensive modality which may be useful for soft tissues treatment. A range of beneficial biological effects induced by ultrasound depends on the exposure levels used during treatment. At high intensities instantaneous tissue necrosis is desired, whereas at lower intensities remedial reversible cellular effects may be produced. For example, increasing of cells immunity against stress can be obtained through the heat shock proteins (Hsp) expression enhancement. The possibility of the Hsp expression enhancement in soft tissues in vivo by means of controlled exposure to ultrasound would allow to evaluate the treatment efficiency. Ultrasonic regimes can be controlled by adjusting the ultrasound intensity, frequency, pulse duration, duty cycle and exposure time. The goal of this work was to develop the numerical model capable of predicting in space and time the temperature fields induced by circular focused transducer generating tone bursts in multilayer nonlinear attenuating media, which is intended for the Hsp expression enhancement therapeutic application. The acoustic pulsed pressure field generated from the transducer was calculated using our original 3D numerical solver [1]. For prediction of the temperature distributions in multilayer biological media the Pennes bio-heat transfer equation was numerically solved. The 3D temperature fields induced in a rat liver in vitro by a 2 MHz transducer with 15 mm diameter and 25 mm focal length during ultrasonic Hsp expression enhancement treatment using various acoustic beam intensities and exposure time was predicted.
Źródło:
Hydroacoustics; 2009, 12; 91-97
1642-1817
Pojawia się w:
Hydroacoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigations of Dual Plug Argon Blowing for Efficient Mixing at Ladle Furnace Station
Autorzy:
Warzecha, Marek
Hutny, A.
Warzecha, P.
Kutyła, Z.
Merder, T.
Powiązania:
https://bibliotekanauki.pl/articles/2049728.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
steelmaking
ladle furnace
numerical modeling
physical modeling
Opis:
The article presents the results of model research concerning the change of technology of argon blowing into liquid steel at the ladle furnace, using the dual plug system. The results of numerical simulations were verified with experimental data carried out on the water model device. The verified model was used to perform numerical simulations to predict the impact of using a new gas injection technology - with different flow rates - on the time to achieve the assumed degree of metal chemical homogenization after alloy addition. Simulation results show that argon blowing metal bath in dual plug mode can effectively reduce mixing time compared to conventional technology with the same gas flow rates. Generally, the use of the dual plug system is beneficial for reducing the bath mixing time, however, the assumed optimal proportion of gas blown through individual plug should be followed. Finally, numerical predictions were used to perform experimental melt under industrial conditions. Industrial verification has clearly confirmed the validity of numerical modeling and showed that also in industrial conditions, a shorter time of chemical homogenization was obtained for the dual plug system.
Źródło:
Archives of Metallurgy and Materials; 2021, 66, 2; 561-572
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Department of Geoinformatics and Applied Computer Science
Autorzy:
Chuchro, M.
Leśniak, A.
Powiązania:
https://bibliotekanauki.pl/articles/184448.pdf
Data publikacji:
2016
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
remote sensing
numerical modeling
geodynamic phenomena
Źródło:
Geology, Geophysics and Environment; 2016, 42, 2; 249-251
2299-8004
2353-0790
Pojawia się w:
Geology, Geophysics and Environment
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hip joint implants - survey of numerical modeling
Autorzy:
Bajer, C.
Małdyk, P.
Kowalczewski, J.
Powiązania:
https://bibliotekanauki.pl/articles/280281.pdf
Data publikacji:
1999
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
biomechanics
hip joints
numerical modeling
FEM
Opis:
In the paper the discussion of the modeling of hip joint implants is presented. the historical attempts to implant construction finally led to complex solutions. To date almost all experiences have learned from clinic observation and rather tests and trial methods than systematic research. Numerical simulations have been limited to simple stress analysis. All phenomena responsible for the damage in the treated joint are not fully explained. The comlexity of the problem is presented in the paper. The stress concentration in the region of rigid inclusion is pointed as one of the mechanical destructive factors. The change of the stem form and material rigidity cuuld reduce extremal stresses by 10-20%.
W pracy omówiono modelowanie implantów stawu biodrowego. Historyczne próby ich konstruowania doprowadziły do bardzo złożonych rozwiązań. Dotąd niemal wszystkie doświadczenia zdobywano w obserwacjach klinicznych i próbach, a nie w wyniku systematycznych badań. Numeryczne symulacje ograniczono do prostej analizy stanu naprężenia. Większość zjawisk odpowiedzialnych za uszkodzenia badanych stawów nie jest w pełni wyjaśniona. W pracy zwrócono uwagę na złożoność zagadnienia. Za jeden z czynników niszczących uznano koncentracje naprężeń w strefach sztywnych wtrąceń. Zmiana kształtu trzpienia i sztywności materiału pozwala zmniejszyć ekstremalne naprężenia o 10-20%.
Źródło:
Journal of Theoretical and Applied Mechanics; 1999, 3; 435-454
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Kierunek przylotu oraz parametry fizyczne meteoroidu Morasko wraz z ich implikacjami dla elipsy rozrzutu – wnioski z badań numerycznych
The direction of impact and dynamic parameters of the Morasko meteoroid together with their implications for the strewn ellipse – insight from numerical modeling
Autorzy:
Bronikowska, Małgorzata
Powiązania:
https://bibliotekanauki.pl/articles/1033095.pdf
Data publikacji:
2018
Wydawca:
Polskie Towarzystwo Meteorytowe
Tematy:
fragmentation
impact
numerical modeling
strewn ellipse
Opis:
The Morasko strewn field located near Poznań, in Poland is an excellent example of well preserved strewn ellipse with several small hypervelocity impact craters. Although many studies on this crater field has been conducted since the first meteorite finding in 1914, the discussion of the strewn ellipse, its shape, size and direction is still ongoing. The proper answers on many questions concerning the Morasko impact can be given by numerical modeling. In this paper the implications of the Morasko meteoroid entry parameters on the observed strewn ellipse are presented. It is shown by numerical modeling, that the Morasko impact occurred from the NE direction, with the shallow horizontal angle. The strewn ellipse size is modeled together with the number of big meteorites which probably remain in the Morasko reserved area deep in the ground. The results described in this paper clearly indicate that the strewn ellipse related to the Morasko fall is elongated no more than several kilometers and contain over a dozen meteorites weighting more than 100 kilograms.
Źródło:
Acta Societatis Metheoriticae Polonorum; 2018, 9; 17-29
2080-5497
Pojawia się w:
Acta Societatis Metheoriticae Polonorum
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Rock strength anisotropy in high stress conditions: a case study for application to shaft stability assessments
Autorzy:
Watson, J. M.
Vakili, M.
Jakubowski, M.
Powiązania:
https://bibliotekanauki.pl/articles/178168.pdf
Data publikacji:
2015
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
anisotropy
high stress
numerical modeling
constitutive model
Opis:
Although rock strength anisotropy is a well-known phenomenon in rock mechanics, its impact on geotechnical design is often ignored or underestimated. This paper explores the concept of anisotropy in a high stress environment using an improved unified constitutive model (IUCM), which can account for more complex failure mechanisms. The IUCM is used to better understand the typical responses of anisotropic rocks to underground mining. This study applies the IUCM to a proposed rock shaft located in high stress/anisotropic conditions. Results suggest that the effect of rock strength anisotropy must be taken into consideration when assessing the rock mass response to mining in high stress and anisotropic rock conditions.
Źródło:
Studia Geotechnica et Mechanica; 2015, 37, 1; 115-125
0137-6365
2083-831X
Pojawia się w:
Studia Geotechnica et Mechanica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Theoretical analysis of optical radiation absorbed in a lighting device
Autorzy:
Wotzka, D.
Powiązania:
https://bibliotekanauki.pl/articles/378373.pdf
Data publikacji:
2017
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
finite element method
numerical modeling
ray propagation
Opis:
The article presents results of theoretical analysis performed using computer simulations based on the finite element method. The study involved analysis of propagation of optical radiation emitted by multiple LEDs installed in a lighting device. The study considered calculation and analysis of optical radiation propagation in the structure of a lamp and its surroundings. Based on the achieved results, the source and amount of losses of optical radiation that is absorbed by the lamps structure elements were determined.
Źródło:
Poznan University of Technology Academic Journals. Electrical Engineering; 2017, 92; 205-213
1897-0737
Pojawia się w:
Poznan University of Technology Academic Journals. Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Possibilities of 3D Model Application in the Process of Aluminium Refining in the Unit With Rotary Impeller
Możliwość zastosowania modelowania 3D do procesu rafinacji aluminium w reaktorze z rotorem
Autorzy:
Merder, T.
Saternus, M.
Warzecha, P.
Powiązania:
https://bibliotekanauki.pl/articles/355922.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
aluminium
refining
numerical modeling
rafinacja
modelowanie numeryczne
Opis:
Both primary and secondary aluminium have to be refined, especially by barbotage process. To know better the mechanism of blowing argon through aluminium in reactors with rotary impellers, numerical modelling is applied. It allows to obtain useful information like: the level of velocity field or participation of gaseous phase. However, numerical analysis requires choosing the proper model which would describe the physical phenomena occurring in the process. So, AnsysFluent code was used in the research. It allows to calculate the two-phase liquid flow for the 2D and 3D co-ordinate systems. Results of calculations for the 3D case can describe more accurately the spatial picture of the movement trajectory of the blown gas bubbles. Calculations were done for the flow rate of refining gas equal 5 dm3 /min and for two cases: when there was no rotation and with 300 rpm rotary impeller speed.
Zarówno aluminium pierwotne, jak i wtórne musi zostać poddane rafinacji, np. poprzez barbotaż. W celu poznania mechanizmu przedmuchiwania aluminium argonem w reaktorach z rotorami stosuje się modelowanie numeryczne. Pozwala ono uzyskać takie informacje jak; określenie pól prędkości czy udziału fazy gazowej. Modelowanie matematyczne wymaga jednakże odpowiedniego modelu określającego warunki fizyczne panujące w procesie. Tak więc, do obliczeń zastosowano kod AnsysFluent, który pozwala na obliczenia przepływów dwufazowych dla dwu- (2D) i trójwymiarowego układu współrzędnych (3D). Wyniki obliczeń dla układu 3D mogą bardziej dokładnie opisać trajektorie ruchu wdmuchiwanych pęcherzyków gazowych. Obliczenia przeprowadzono dla natężenia gazu 5 dm3 /min przy braku rotacji oraz przy prędkości obrotowej 300 obr/min.
Źródło:
Archives of Metallurgy and Materials; 2014, 59, 2; 789-794
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental Methods of Validation for Numerical Simulation Results on Steel Flow through Tundish
Autorzy:
Pieprzyca, J.
Warzecha, P.
Merder, T.
Warzecha, M.
Powiązania:
https://bibliotekanauki.pl/articles/355968.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
continuous casting
tundish
physical modelling
numerical modeling
Opis:
The article presents experimental results on the impact of tundish flow regulator influencing the liquid steel flow course. The research was conducted based on the hybrid modelling methods understood as a complementary use of Computational Fluid Dynamics (CFD) methods and physical modelling. Dynamic development of numerical simulation techniques and accessibility to highly advanced and specialized software causes the fact that these techniques are commonly used for solving problems related to liquid flows by using analytical methods. Whereas, physical modelling is an important cognitive tool in the field of empirical identification of these phenomena. This allows for peer review and specification of the researched problems. By exploiting these relationships, a comparison of the obtained results was performed in the form of residence time distribution (RTD) curves and visualization of particular types of liquid steel flow distribution zones in the investigated tundish.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 4; 2057-2060
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical Assessment of the Experimental Thermoelectric Cooling System Effectiveness
Autorzy:
Gołębiowska, Justyna
Widomski, Marcin K.
Powiązania:
https://bibliotekanauki.pl/articles/2202299.pdf
Data publikacji:
2022
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
COP
numerical modeling
thermoelectric cooling
cooling effectiveness
Opis:
Solid-state thermoelectric elements, such as thermoelectric (TE) modules, can be used as cooling devices. Small-sized TE modules, characterized by: lack of moving parts, no required refrigerants application as well as variable possible installation and operation positions, allow, in several specified cases, achieving the advantage in cooling process over the conventional refrigeration devices. This paper presents the results of the preliminary numerical determination of energetic efficiency of thermoelectric cooling system, applied for cooling a small-scale experimental room. The heat exchangers used in the cooling system consisted of heat sinks and radiators installed on the both sides of the TE module. The numerical assessment included in this paper, based on a 3D model reflecting the experimental room and thermoelectric cooling system, allowed determining the relation between TE module power supply characteristics and cooling effects, as well as time-related temperature distribution inside the modeled experimental room. The commercial modeling software FLUENT, ANSYS 12.0 by ANSYS Inc. was applied in numerical calculations. The results of the performed laboratory studies were used as a basis for model development, required input data, initial and boundary conditions. The results of laboratory tests showed the influence of amperage of power supply on the efficiency of cooling characteristics, as well as distribution of air temperature inside the experimental room. Calibration and validation of the developed model was also based on the results of laboratory experiment. The obtained results of numerical calculations showed the influence of amperage of power supply on efficiency of cooling characteristics as well as distribution of air temperature inside the experimental room.
Źródło:
Journal of Ecological Engineering; 2022, 23, 12; 99--110
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An analysis of the influence of fracturing technological parameters on fracture propagation using numerical modeling
Autorzy:
Dudek, J.
Janiga, D.
Wojnarowski, P.
Powiązania:
https://bibliotekanauki.pl/articles/298932.pdf
Data publikacji:
2017
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
hydraulic fracturing
numerical modeling
GOHFER 3-D
Opis:
Nowadays, hydraulic fracturing is one of the most common treatments for both conventional and unconventional fields, a stimulation technique designed to increase well production through the reduction of flow resistance caused by the drilling process or genuine reservoir properties. In this article the planar, three-dimensional numerical model of hydraulic fracturing treatment is presented. Based on the given model, the influence analysis of the basic technological parameters of the fracturing in a directional well on fracture propagation was conducted. The presented analysis shows the crucial role of numerical modeling in the process of hydraulic fracturing treatment design. The outcomes allowed us to identify the sensitivity of the obtained fracturing effects on the change of the treatment of technical parameters.
Źródło:
AGH Drilling, Oil, Gas; 2017, 34, 3; 677-690
2299-4157
2300-7052
Pojawia się w:
AGH Drilling, Oil, Gas
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical model of plastic destruction of thick steel structural elements
Autorzy:
Kowalski, J.
Kozak, J.
Powiązania:
https://bibliotekanauki.pl/articles/259652.pdf
Data publikacji:
2018
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
impact strength
numerical modeling
steel structural elements
Opis:
In the shipbuilding industry, the risk of brittle fracture of the structure is limited by using certified materials with specified impact strength, determined by the Charpy method (for a given design temperature) and by supervising the welding processes (technology qualification, production supervision, non-destructive testing). For off-shore constructions, classical shipbuilding requirements may not be sufficient. Therefore, the regulations used in the construction of offshore structures require CTOD tests for steel and welded joints with a thickness greater than 40 mm in the case of high strength steel and more than 50 mm in the case of other steels. Classification societies do not accept CTOD test results of samples with a thickness less than the material tested. For this reason, the problem of theoretical modeling of steel structure destruction process is a key issue, because laboratory tests for elements with high thickness (in the order of 100 mm and more) with a notch are expensive (large samples, difficulties in notching), and often create implementation difficulties due to required high load and range of recorded parameters. The publication will show results and conclusions from numerical modeling of elastic properties for steel typical for offshore applications. Calculations were carried out at the Academic Computer Centre in Gdańsk.
Źródło:
Polish Maritime Research; 2018, 2; 78-84
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characteristics of porous beds based on fractal parameters
Autorzy:
Bramowicz, M.
Kulesza, S.
Sobieski, W.
Powiązania:
https://bibliotekanauki.pl/articles/298066.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie
Tematy:
granular beds
porosity
fractal analysis
numerical modeling
Opis:
The paper presents the results of a fractal analysis of the cross-sections of a porous mineral deposit consisting of spherical elements which formed a spatial system with varying porosity (0.4 to 0.95). The virtual deposit was generated using the Discrete Element Method in the YADE code by means of the so-called Radius Expansion Method. The fractal analysis was carried out using the structure function method, determining the fractal dimension (D), the topothesy (L) and the corner frequency (l) (MAINSAH et al. 2001). The conducted simulations have confirmed to a considerable extent the test results available in the literature involving the fractal analysis of mineral deposits with varying porosity. They clearly indicate that the fractal dimension does not change along with the porosity of the deposit, if the autocorrelation function or their transformations (e.g. structure function) methods are used. Moreover, based on the information available in the literature, it can be concluded that the value of the fractal dimension corresponds to mineral deposits with the specified geometric shapes of the elements which form them.
Źródło:
Technical Sciences / University of Warmia and Mazury in Olsztyn; 2017, 20(2); 171-179
1505-4675
2083-4527
Pojawia się w:
Technical Sciences / University of Warmia and Mazury in Olsztyn
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical modeling of field-assisted Ag+–Na+ ion-exchanged channel waveguides using varied explicit space charge density approach
Autorzy:
Mrozek, Piotr
Powiązania:
https://bibliotekanauki.pl/articles/173835.pdf
Data publikacji:
2019
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
numerical modeling
channel waveguide
field-assisted ion-exchange
Opis:
This article presents a numerical model of field-assisted Ag+–Na+ ion exchange in glass, used to determine Ag+ ion concentration contours in cross-sections of channel waveguides. Space charge density was used as a modeling parameter, with different values adopted separately under the mask and in the region of the mask window. Based on the results of simulations, it can be stated that the space charge distribution under the mask has a decisive influence on the diffusion range of Ag+ ions into the glass and on the shape of silver ion concentration contours corresponding to the maximum range of Ag+ ions diffusion. Charge generated within the diffusive structure influences the shape of silver ion concentration contours near the mask’s edge and affects the thickness of the polarized layer under the mask within the waveguide’s optical structure. Modeling results indicate a significant influence of factors affecting space charge density distribution in glass on the results of forming channel waveguides in the field-assisted process.
Źródło:
Optica Applicata; 2019, 49, 4; 641-653
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 275

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