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Tytuł:
***
Autorzy:
r., c.
Powiązania:
https://bibliotekanauki.pl/articles/943045.pdf
Data publikacji:
2005
Wydawca:
Związek Karaimów Polskich. Karaimska Oficyna Wydawnicza Bitik
Źródło:
Awazymyz. Pismo historyczno-społeczno-kulturalne Karaimów; 2005, 1 (10); 6-6
1733-7585
Pojawia się w:
Awazymyz. Pismo historyczno-społeczno-kulturalne Karaimów
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
2D radar technology increasing productivity by volumetric control and hopper car positioning in brown coal mining
Technologia radaru dwuwspółrzędnego zwiększająca produktywność poprzez kontrolę objętościową oraz pozycjonowanie wagonów samowyładowczych w wydobyciu węgla brunatnego
Autorzy:
Winkel, R.
Augustin, C.
Nienhaus, K.
Powiązania:
https://bibliotekanauki.pl/articles/350748.pdf
Data publikacji:
2011
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
skanowanie zbocza
kontrola głębokości skrawu
przesyp
pozycjonowanie
przenośniki taśmowe
strumień objętościowy
czujnik radarowy 2D
skanowanie objętości składu
kontrola zapasów
wskaźnik poziomu w silosie
pomiar w zasobniku
slope scanning
cutting depth control
belt transfer units
positioning
conveyor belt volumetric flow
2D Radar Sensor
stockpile volume scan
inventory control
silo level gauge
bunker measurement
Opis:
The continuous brown coal mining technology has been highly advancing by mechanical design within the last decades. The driving factor has been the demand for increasing productivity and total availability. Indurad - the industrial radar company - addresses both of these factors with its solutions in increasing the utilization of mining machinery. Indurads technological solutions are helping to optimize the brown coal flow chain from across the. Starting at the excavators working bench (cutting depth control) via the belt transfer units (positioning), on the conveyor belt (volumetric flow) and finally to the stockpile volume scan (stockpile inventory control). The key for its solutions is a highly robust unique two-dimensional radar technology which has been specially developed for the rough mining environment. Within the paper successful applications are shown for the German brown coal mining as well as other solutions realized with indurad's technology in the global mining industry.
Wydobycie węgla brunatnego metodą ciągłą przy użyciu kombajnów rozwijało się dynamicznie w ostatnich dekadach dzięki nowym rozwiązaniom mechanicznym. Czynnikiem przyspieszającym rozwój była potrzeba większej wydajności oraz całkowitej dostępności. Indurad - firma specjalizująca się w radarach do celów przemysłowych - znalazła rozwiązania odpowiadające obydwu tym potrzebom, polegające na zwiększonym wykorzystaniu maszyn górniczych. Rozwiązania technologiczne firmy Indurad pomagają zoptymalizować poszczególne etapy procesu wydobycia węgla brunatnego; poczynając od warstwy urabiania pokładu (kontrola głębokości skrawu), poprzez miejsce przesypu przenośnika (pozycjonowanie), na przenośniku taśmowym (strumień objętościowy), aż po skanowanie objętości składowiska (kontrola zapasu na składowisku). Kluczowym elementem tych rozwiązań jest unikalna, wysoce wydajna technologia radaru dwuwspółrzędnego, która została rozwinięta specjalnie na potrzeby trudnych warunków występujących w górnictwie. Niniejsza praca przedstawia skuteczne zastosowania w niemieckim górnictwie węgla brunatnego, a także inne rozwiązania przeprowadzone przy pomocy technologii firmy Indurad w światowym przemyśle górniczym.
Źródło:
Górnictwo i Geoinżynieria; 2011, 35, 3/1; 273-289
1732-6702
Pojawia się w:
Górnictwo i Geoinżynieria
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
3D laser scanning technique for the inspection and monitoring of railway tunnels
Technika skanowania laserowego 3D do kontroli i monitorowania tuneli kolejowych
Autorzy:
Chen, H-M.
Ulianov, C.
Shaltout, R.
Powiązania:
https://bibliotekanauki.pl/articles/375282.pdf
Data publikacji:
2015
Wydawca:
Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:
railway tunnel
inspection of railway tunnels
monitoring of railway tunnels
laser scanning
tunel kolejowy
inspekcja tuneli kolejowych
monitorowanie tuneli kolejowych
skanowanie laserowe
Opis:
Railway tunnel inspection and monitoring has predominantly been a visual and manual procedure, which is time-consuming and subjective, giving rise to variance in standards and quality. Thus, alternative, novel, automated techniques need to be developed, for more efficient and reliable tunnel examination. The reported research aimed to investigate the application of a laser scanning technique for the inspection of tunnel degradation and structural integrity. The proposed method may either substitute or supplement traditional survey techniques, being more efficient, and contributing thus to the standardisation of tunnel inspections. For the purpose of investigating the applicability and accuracy of laser scanning in tunnels, a set of tunnel lining models was constructed for laboratory tests, with the objective of determining the quality of the imaging. Initial tests were carried out using a performant laser scanner and demonstrated the feasibility of the concept. As a result, refined laboratory models were built, and experiments conducted, to establish the quality and precision of laser scanning imaging, for condition monitoring of tunnels. The experimental results indicate that the laser scanning technique used in this research has high potential for detecting the tunnel condition, monitoring the depth of weathered mortar, spalling bricks etc. with high accuracy in static scanning mode.
Kontrola i monitoring tuneli kolejowych w przeważającej mierze to procedura, która jest czasochłonna i subiektywna, co powoduje zróżnicowanie standardów i jakości badań. Stąd też muszą być opracowane alternatywe, nowoczesne, zautomatyzowane techniki do bardziej skutecznych i rzetelnych badań. Przedstawione badania miały na celu wskazanie zastosowania techniki skanowania laserowego do kontroli degradacji tunelu i integralności strukturalnej. Proponowana metoda może zastąpić, bądź uzupełnienić, tradycyjne techniki pomiarowe. Jest ona bardziej wydajna i może przyczynić się do standaryzacji kontroli tuneli. Aby zbadać przydatności i dokładności skanowania laserowego w tunelach, skonstruowano zestaw modeli do testów labolatoryjnych, w celu określenia jakości obrazów. Wyniki doświadczalne wskazują, że technika skanowania laserowego zastosowana w badaniu ma wysoki potencjał do charakteryzowania stanu tunelu, monitorowania głębokości zwietrzenia zaprawy, odpryskiwania cegieł itp., z dużą dokładnością w trybie statycznym skanowania.
Źródło:
Transport Problems; 2015, T. 10, z. spec.; 73-84
1896-0596
2300-861X
Pojawia się w:
Transport Problems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A $\text{}^{55}$Mn NMR Study of La$\text{}_{0.33}$Nd$\text{}_{0.33}$Ca$\text{}_{0.34}$Mn O$\text{}_{3}$ with $\text{}^{16}$O and $\text{}^{18}$O
Autorzy:
Rybicki, D.
Kapusta, Cz.
Riedi, P. C.
Oates, C. J.
Sikora, M.
Zając, D.
De Teresa, J. M.
Marquina, C.
Ibarra, M. R.
Powiązania:
https://bibliotekanauki.pl/articles/2037128.pdf
Data publikacji:
2004
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
76.60.-k
75.47.Gk
Opis:
A $\text{}^{55}$Mn NMR study of $\text{}^{16}$O and $\text{}^{18}$O containing La$\text{}_{0.33}$Nd$\text{}_{0.33}$Ca$\text{}_{0.34}$Mn O$\text{}_{3}$ is reported. The spin-echo spectra measured at 4.2 K and zero field consist of a double exchange line corresponding to the ferromagnetic metallic regions. The line intensity is more than an order of magnitude lower for the $\text{}^{18}$O compound, which indicates an order of magnitude lower content of the ferromagnetic metallic phase in this compound. The frequency dependence of the spin-spin relaxation time T$\text{}_{2}$ shows a pronounced minimum at the center of the double exchange line of both compounds due to the Suhl-Nakamura interaction, which indicates that the ferromagnetic metallic regions are at least 10~nm in size. The results are discussed in terms of the influence of oxygen isotopic substitution on phase segregation.
Źródło:
Acta Physica Polonica A; 2004, 105, 1-2; 183-188
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A 3D trabecular bone homogenization technique
Autorzy:
Marques, Marco Costa
Belinha, J.
Oliveira, A. F.
Manzanares Cespedes, M.C.
Natal Jorge, R.M.
Powiązania:
https://bibliotekanauki.pl/articles/27324130.pdf
Data publikacji:
2020
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
fabric tensor
homogenization technique
multiscale
bone
tensor tkaniny
technika homogenizacji
wieloskalowe
kość
Opis:
Purpose: Bone is a hierarchical material that can be characterized from the microscale to macroscale. Multiscale models make it possible to study bone remodeling, inducing bone adaptation by using information of bone multiple scales. This work proposes a computationally efficient homogenization methodology useful for multiscale analysis. This technique is capable to define the homogenized microscale mechanical properties of the trabecular bone highly heterogeneous medium. Methods: In this work, a morphology-based fabric tensor and a set of anisotropic phenomenological laws for bone tissue was used, in order to define the bone micro-scale mechanical properties. To validate the developed methodology, several examples were performed in order to analyze its numerical behavior. Thus, trabecular bone and fabricated benchmarks patches (representing special cases of trabecular bone morphologies) were analyzed under compression. Results: The results show that the developed technique is robust and capable to provide a consistent material homogenization, indicating that the homogeneous models were capable to accurately reproduce the micro-scale patch mechanical behavior. Conclusions: The developed method has shown to be robust, computationally less demanding and enabling the authors to obtain close results when comparing the heterogeneous models with equivalent homogenized models. Therefore, it is capable to accurately predict the micro-scale patch mechanical behavior in a fraction of the time required by classic homogenization techniques.
Źródło:
Acta of Bioengineering and Biomechanics; 2020, 22, 3; 139--152
1509-409X
2450-6303
Pojawia się w:
Acta of Bioengineering and Biomechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A bypass flow model with a procedure to approximate precipitation intensity
Autorzy:
Walczak, R T
Slawinski, C.
Powiązania:
https://bibliotekanauki.pl/articles/1401856.pdf
Data publikacji:
2000
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
bypass flow model
preferential water flow
precipitation
intensity
water flow
distribution
Opis:
Precipitation and intensity of precipitation are the most important parameters of soil profile water balance. Precipitation values give the information about amount of water reaching the soil surface. Intensity of the precipitation determines the amount of water accumulated in a soil profile and the amount of runoff water. The aim of the paper was to show the importance of consideration of precipitation distribution approximation in water dynamics modelling in soil profile taking into account preferential water flow.
Źródło:
Acta Agrophysica; 2000, 35; 211-217
1234-4125
Pojawia się w:
Acta Agrophysica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A CFD package for the 3D Navier-Stokes computation of unsteady flows in turbomachines
Autorzy:
Thermann, H.
Schmidt, S.
Weiss, C.
Niehuis, R.
Powiązania:
https://bibliotekanauki.pl/articles/1967647.pdf
Data publikacji:
2001
Wydawca:
Politechnika Gdańska
Tematy:
CFD
computational fluid dynamics CFD
turbomachinery
laminar-to-turbulent transition
flutter
clocking
Navier-Stokes package
Opis:
A 3D Navier-Stokes package for the time-accurate computation of unsteady flows in turbomachines with emphasis on wide applicability, portability and efficiency is presented. The package consists of three components: the elliptic grid generator FRAME, the parallelised implicit Reynolds- and Favre-averaged Navier-Stokes solver PANTA and the post-processor TREAT especially designed for unsteady flow phenomena. The applicability of the package covers both rotor/stator interaction and blade flutter phenomena in multirow and multipassage 2D, Quasi3D and general 3D configurations in a wide range of flow velocities (subsonic, transonic). For turbulent computations either a Low-Reynolds-Number k-" or k-! turbulence model is available. Additionally, an algebraic transition model can be chosen from a variety of different models to enhance the accuracy of prediction for transitional flow phenomena. A description of the underlying algorithms and numerical methods as well as the main features and characteristics of each of the three components is given. Furthermore, selected examples of typical turbomachinery applications are shown to demonstrate these features.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2001, 5, 4; 537-547
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Comparative Study on Ex-Situ & In-Situ Formed Metal Matrix Composites
Autorzy:
Gobalakrishnan, B.
Rajaravi, C.
Udhayakumar, Gobikrishnan
Lakshminarayanan, P. R.
Powiązania:
https://bibliotekanauki.pl/articles/2203734.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
MMCs
Al-SiC
Al-TiB2
extrusion
heat treatment
mechanical properties
microstructure
Opis:
An attempt has been made to synthesize the aluminium based ex-situ (Al-SiC) and in-situ (Al-TiB2) formed metal matrix composites with varying weight percentage of reinforcement contents such as 4wt.%, 6wt.% and 8wt.%. Synthesized composites were subjected to a cold extrusion process followed by heat treatment according to the ASTM B 918-01 standards. The mechanical properties of in-situ composites were evaluated as per the ASTM guidelines and compared with ex-situ formed composites and base metal properties. Superior properties were noticed in the in-situ formed composites and the mechanical properties such as yield strength, Ultimate tensile strength (UTS) and Hardness for both ex-situ and in-situ composites were found to increase with increasing the reinforcement addition. Cold extruded Al-8 wt.% SiC composite properties such as hardness, yield strength and UTS are 87 RB, 152 MPa, 216 MPa respectively. Whereas, for Al-8 wt.% TiB2 composite, the corresponding properties are 94 RB, 192 MPa, 293 MPa. The morphology of the composites is analysed by Optical and Scanning Electron Microscopic (SEM) whereas presence of reinforcement particles such SiC and TiB2 along with intermetallic phases Mg2Si and Al5FeSi are confirmed by EDX, XRD and Element Mapping analyses.
Źródło:
Archives of Metallurgy and Materials; 2023, 68, 1; 171--185
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A comparative study on the performance of radiation detectors from the HgI2 crystals grown by different techniques
Autorzy:
Martins, J. F. T.
Costa, F. E.
dos Santos, R. A.
de Mesquita, C. H.
Hamada, M. M.
Powiązania:
https://bibliotekanauki.pl/articles/146916.pdf
Data publikacji:
2012
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
crystal growth
iodide mercury crystal
physical vapor transport (PVT)
radiation detector
semiconductor crystal
Opis:
In this work, the establishment of a technology for HgI2 purification and crystal growth is described, aiming at a future application of this crystal as a room temperature radiation semiconductor detector. Two methods of crystal growth were studied in the development of this work: (1) physical vapor transport (PVT) and (2) saturated solution from dimethylsulphoxide (DMSO) complexes. In order to evaluate the crystals obtained using each of these methods, systematic measurements were carried out for determining the stoichiometry, structure, orientation, surface morphology and impurity of the crystal. The influence of these physicochemical properties of the crystals developed was evaluated in terms of their performance as a radiation detector. The best response to radiation was found for the crystals grown by the PVT technique. Significant improvement in the performance of HgI2 radiation detector was found, purifying the crystal by means of two successive growths by the PVT technique.
Źródło:
Nukleonika; 2012, 57, 4; 555-562
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A comparison of FLOTAC and CFF techniques in detecting gastrointestinal parasites in water buffaloes (Bubalus bubalis)
Autorzy:
Salvador, R.T.
Abalos, R.P.
Ruba, A.M.
Mingala, C.N.
Powiązania:
https://bibliotekanauki.pl/articles/5746.pdf
Data publikacji:
2014
Wydawca:
Polskie Towarzystwo Parazytologiczne
Tematy:
parasitism
FLOTAC technique
CFF technique
detection
gastrointestinal parasite
parasite
water buffalo
Bubalus bubalis
nematode
prevalence
Opis:
The objective of the study was to compare the usefulness of FLOTAC and centrifugal fecal flotation (CFF) techniques. More specifically, the taxonomic classes (Nematoda and Cestoda) of endoparasites present in fecal samples of buffaloes are identified, the sensitivity and specificity of FLOTAC relative to CFF are calculated, and the agreement of both techniques is evaluated using Kappa statistics. Fresh fecal samples from 220 buffaloes in 10 municipalities were collected. Sheather’s sugar was used as a flotation solution for both the FLOTAC and CFF techniques. Of the 220 animals, 109 samples were nematode positive and 111 samples were nematode negative according to the FLOTAC technique, while 74 were found to be positive and 146 negative according to the CFF technique. No cestodes were detected by either technique. The calculated sensitivity for FLOTAC is 89.19% and its specificity is 70.55%. Kappa statistics revealed moderate agreement (k=0.535) between the two techniques in detecting nematodes. The prevalence observed based on FLOTAC and CFF test were 49.54% (109/220; 95% CI: 47.75–56.34) and 33.64% (72/220; 95% CI: 27.42–40.3), respectively.
Źródło:
Annals of Parasitology; 2014, 60, 2
0043-5163
Pojawia się w:
Annals of Parasitology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A concept of pusher - barge coupling device of two-segment ship for inland waterways and coastal service
Autorzy:
Dymarski, C.
Rolbiecki, R.
Powiązania:
https://bibliotekanauki.pl/articles/260471.pdf
Data publikacji:
2006
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
ship devices
hydraulic drive and control
Opis:
This paper presents design assumptions and a constructional concept of the device for coupling the pusher and hotel barge of two-segment inland waterways and coastal ship. The presented device makes it possible to reach either stiff connection or mutually controlled inclination of both segments against each other, which greatly improves the ship’s manoeuvrability and thus safety of navigation especially on narrow and meandering waterways.
Źródło:
Polish Maritime Research; 2006, S 2; 76-79
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A convergent approach for the synthesis of new pyrazolyl bipyridinyl substituted coumarin derivatives as antimicrobials
Autorzy:
Bhila, V. G.
Chovatiya, Y. L.
Patel, C. V.
Giri, R. R.
Brahmbhatt, D. I.
Powiązania:
https://bibliotekanauki.pl/articles/411982.pdf
Data publikacji:
2015
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Coumarin
Bipyridine
Pyrazole
Kröhnke’s reaction
antimicrobial activity
Opis:
Some new 3-[3-(1-phenyl-3-aryl-1H-pyrazol-4-yl)acryloyl]coumarins 3a-f were synthesized (coumarin chalcones) by the condensation of various 3-acetyl coumarins 1 and appropriate 1-phenyl-3-aryl-1H-pyrazole-4-carbaldehyde 2. These coumarin chalcones 3a-f were then employed for the synthesis of pyrazolyl bipyridinyl substituted coumarins 7a-f, 8a-f, and 9a-f under Krohnke’s reaction condition. The characterization of all the synthesized compounds was carried out by elemental analysis, IR, 1H-NMR, 13C-NMR, DEPT-135 and mass spectral analysis. In addition to that, in vitro antimicrobial competency of the title compounds was assessed against selected pathogens. Compounds 3b, 3e, 7b, 8b, 8c and 9b exhibited excellent antimicrobial activity and said to be the most proficient members of the series.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2015, 40; 1-16
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A description of the sources of magnetic field using edge values of the current vector potential
Autorzy:
Wojciechowski, R. M.
Jędryczka, C.
Powiązania:
https://bibliotekanauki.pl/articles/140898.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
numerical modeling
edge element analysis
current vector potential T0
stranded windings
Opis:
The paper discusses the method of a description of the magnetic field sources in systems with the stranded windings. The sources are determined on the basis of an obtained distribution of edge values of the current vector potential T0. The formulas describing the magnetic field sources in the finite element (FE) space for the formulations using the scalar potential F and the vector potential A have been given. The approach for determining the T0 distribution in the stranded windings of simple and complex geometries has been proposed.
Źródło:
Archives of Electrical Engineering; 2018, 67, 1; 17-26
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A diverse snake fauna from the early Eocene of Vastan Lignite Mine, Gujarat, India
Autorzy:
Rage, J -C
Folie, A.
Rana, R.S.
Singh, H.
Rose, K.D.
Smith, T.
Powiązania:
https://bibliotekanauki.pl/articles/22685.pdf
Data publikacji:
2008
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
Cambay Formation
Vastan Lignite Mine
Gujarat
fossil snake
Early Eocene
paleontology
Caenophidia
India
Serpentes
snake fauna
Opis:
The early Eocene (Ypresian) Cambay Formation of Vastan Lignite Mine in Gujarat, western India, has produced a diverse assemblage of snakes including at least ten species that belong to the Madtsoiidae, Palaeophiidae (Palaeophis and Pterosphenus), Boidae, and several Caenophidia. Within the latter taxon, the Colubroidea are represented by Russellophis crassus sp. nov. (Russellophiidae) and by Procerophis sahnii gen. et sp. nov. Thaumastophis missiaeni gen. et sp. nov. is a caenophidian of uncertain family assignment. At least two other forms probably represent new genera and species, but they are not named; both appear to be related to the Caenophidia. The number of taxa that represent the Colubroidea or at least the Caenophidia, i.e., advanced snakes, is astonishing for the Eocene. This is consistent with the view that Asia played an important part in the early history of these taxa. The fossils come from marine and continental levels; however, no significant difference is evident between faunas from these levels. The fauna from Vastan Mine includes highly aquatic, amphibious, and terrestrial snakes. All are found in the continental levels, including the aquatic palaeophiids, whereas the marine beds yielded only two taxa. Vastan Mine is only the second locality in which the palaeophiids Palaeophis and Pterosphenus co−occur. The composition of the fauna from Vastan is on the whole similar to that of the early Eocene of Europe; however, comparisons with early Eocene faunas of other continents are not possible because they are poorly known or unknown.
Źródło:
Acta Palaeontologica Polonica; 2008, 53, 3
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A dynamically adaptive lattice Boltzmann method for thermal convection problems
Autorzy:
Feldhusen, K.
Deiterding, R.
Wagner, C.
Powiązania:
https://bibliotekanauki.pl/articles/331394.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
lattice Boltzmann method
adaptive mesh refinement
thermal convection
incompressible
metoda siatkowa Boltzmanna
adaptacyjne zagęszczanie siatki
konwekcja termiczna
Opis:
Utilizing the Boussinesq approximation, a double-population incompressible thermal lattice Boltzmann method (LBM) for forced and natural convection in two and three space dimensions is developed and validated. A block-structured dynamic adaptive mesh refinement (AMR) procedure tailored for the LBM is applied to enable computationally efficient simulations of moderate to high Rayleigh number flows which are characterized by a large scale disparity in boundary layers and free stream flow. As test cases, the analytically accessible problem of a two-dimensional (2D) forced convection flow through two porous plates and the non-Cartesian configuration of a heated rotating cylinder are considered. The objective of the latter is to advance the boundary conditions for an accurate treatment of curved boundaries and to demonstrate the effect on the solution. The effectiveness of the overall approach is demonstrated for the natural convection benchmark of a 2D cavity with differentially heated walls at Rayleigh numbers from 103 up to 108. To demonstrate the benefit of the employed AMR procedure for three-dimensional (3D) problems, results from the natural convection in a cubic cavity at Rayleigh numbers from 103 up to 105 are compared with benchmark results.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2016, 26, 4; 735-747
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 1056

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