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Tytuł:
Experimental and numerical investigation of scour downstream contracted spillways
Autorzy:
Nasralla, Tarek H.
Powiązania:
https://bibliotekanauki.pl/articles/2073735.pdf
Data publikacji:
2022
Wydawca:
Instytut Technologiczno-Przyrodniczy
Tematy:
buffers
contraction
downstream
Flow-3D
scour
spillway
Opis:
A study of scour downstream of free hydraulic jump in stilling basin of stepped spillways was carried out. This paper employed an experimental study to investigate the stepped spillway with the movable bed material of D50= 3.1 mm. The effect of the contraction ratio of the stepped spillway was highlighted. Different downstream divergent angle was studied to minimise the scour depth, the results showed that the relative scour depth was reduced by 23% for divergent angle is equal to 170°, different shapes of buffer in stilling basin were also studied to reduce the scour depth where the considered buffer decrease the relative scour depth up to 84%. This study was simulated by Flow 3D program to analyse the scour hole formed using velocity vectors at the bed. The simulated results well agreed with the measured data.
Źródło:
Journal of Water and Land Development; 2022, 52; 53--59
1429-7426
2083-4535
Pojawia się w:
Journal of Water and Land Development
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical Analysis of Solid Particles Flow in Liquid Metal
Autorzy:
Szucki, M.
Goraj, T.
Lelito, J.
Suchy, J. S.
Powiązania:
https://bibliotekanauki.pl/articles/382986.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
numerical analysis
solid particle
particle flow
metal matrix composite
FLOW-3D software
analiza numeryczna
cząstka stała
przepływ cząstki
kompozyt metalowy
oprogramowanie FLOW-3D
Opis:
The aim of the study was to determine the influence of the solid particles density and size on their distribution in the solidified cast. As part of the work, a series of numerical simulations of filling and solidification process were made with the use of FLOW-3D software. The analysis was performed on pure aluminum and six chosen types of particles with different size and density. Obtained results may help to understand the behavior of solid particles in liquid metals.
Źródło:
Archives of Foundry Engineering; 2013, 13, 3 spec.; 161-166
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical investigations of stilling basin efficiency downstream radial gates : A case study of New Assuit Barrage, Egypt
Autorzy:
Elberry, Mohamed
Ali, Abdelazim
Abdelhaleem, Fahmy
Ibrahim, Amir
Powiązania:
https://bibliotekanauki.pl/articles/28411659.pdf
Data publikacji:
2023
Wydawca:
Instytut Technologiczno-Przyrodniczy
Tematy:
Flow-3D
New Assuit Barrage
riprap stability
stilling basin
verification
Opis:
Radial gates are more common than vertical sluice gates for a number of reasons. They are simpler to use, cause less flow disturbance, require less lifting force, and deliver better discharge. Radial gates are commonly used in new barrages, such as the New Assuit Barrage. Prior researchers used physical investigations to study the efficiency of stilling basin downstream radial gates, but physical studies cost a lot of money and time, so numerical solutions should be investigated. The current study aimed to explore numerically the influence of stilling basin shape and baffle block arrangement on the stability of bed protection, near-bed velocity, energy dissipation, and hydraulic jump characteristics downstream of radial gates. Different 12 discharges were investigated, and their results were compared with previous physical results to verify the performance of the numerical results. The results obtained from the numerical model from all trials are almost identical to the physical model results. Five different alternative designs were carried out numerically to enhance the design of the New Assuit Barrage (NAB) spillway stilling basin. Results showed that alternatives 4 (changing the geometry of the basin by removing the end step and concrete slab) and 5 (as alternative 4 in addition to adding rounded baffle blocks presented in two rows arranged in a staggered way) gave good velocity distribution with low turbulence, low values of near-bed velocities, and stability of bed protection. Also, it is more economical because of the lower cost of concrete and excavation.
Źródło:
Journal of Water and Land Development; 2023, 59; 126--134
1429-7426
2083-4535
Pojawia się w:
Journal of Water and Land Development
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Development and manufacturing of casting technology for crawler vehicle suspension used in wetlands
Autorzy:
Małysza, M.
Kowalski, P.
Wańczyk, K.
Gil, A.
Dziedzic, S.
Żuczek, R.
Powiązania:
https://bibliotekanauki.pl/articles/391844.pdf
Data publikacji:
2017
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Odlewnictwa
Tematy:
CAx
computer simulations
Flow3D
Ansys
casting technology
3D printing
aluminum casting
Opis:
The modern designing techniques and development procedures requires the use of advanced integrated methods. That kind of approach requires the involvement of series of steps which leads to the logical work stream known as Integrated Computational Material Engineering. The steps involve the design and evaluation process in the virtual environment of CAD/CAE and simulation software. The use of simulation software allows for online optimization of the shape and properties of designed part. The publication presents a design and manufacturing process of a component of the larger assembly of the chassis of heavy-duty machine. Established methodology includes the analysis of the initial geometry of the part of the heavy vehicle used in difficult wetland environmental conditions.
Źródło:
Prace Instytutu Odlewnictwa; 2017, 57, 4; 351-356
1899-2439
Pojawia się w:
Prace Instytutu Odlewnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numeryczna analiza przepływów w wybranych fragmentach układów wlewowych stosowanych przy wytwarzaniu odlewów wielkogabarytowych
Numerical Analysis of Flows in Selected Parts of the Gating Systems Used in Large-size Castings Production
Autorzy:
Goraj, T.
Szucki, M.
Lelito, J.
Suchy, J. S.
Powiązania:
https://bibliotekanauki.pl/articles/380475.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
analiza numeryczna
układy wlewowe
odlewy wielkogabarytowe
pęcherze gazowe
FLOW-3D
numerical analysis
large-size castings
filling system
Opis:
Niniejsza praca zawiera analizę przepływów dwufazowych (ciekły metal - gaz) w wybranym fragmencie układów wlewowych, stosowanych przy produkcji wielkogabarytowych odlewów ze stopów żelaza, w oparciu o symulacje komputerowe wykonane w programie FLOW-3D. W ramach publikacji dobrano układy modelowe oraz parametry symulacji numerycznych. Na podstawie uzyskanych wyników badań szczegółowo przestudiowano rozkład prędkości i ciśnienia w tych układach oraz wskazano obszary narażone na erozję materiału ceramicznego i miejsca kumulowania się gazów.
Current work includes an analysis of the two-phase flows (liquid metal - gas) in a selected parts of the gating systems, used in large-size iron castings production. The studies were carried out with the use of FLOW-3D software. Within the paper a model system and the parameters of numerical simulations were selected. Based on the obtained results, the velocity and pressure profile in the model systems were analyzed as well as the areas susceptible to erosion of the ceramic material and gas entrainment were indicated.
Źródło:
Archives of Foundry Engineering; 2014, 14, 4 spec.; 25-30
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Doświadczalna weryfikacja symulacji procesu odlewania odśrodkowego w formach ceramicznych
Experimental verification of the simulation of centrifugal casting in ceramic moulds
Autorzy:
Leśniewski, W.
Wieliczko, P.
Małysza, M.
Powiązania:
https://bibliotekanauki.pl/articles/391743.pdf
Data publikacji:
2015
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Odlewnictwa
Tematy:
odlewanie odśrodkowe
symulacja komputerowa
Flow-3D
modele woskowe
siła odśrodkowa
siła Coriolisa
centrifugal casting
computer simulation
wax models
centrifugal force
Coriolis force
Opis:
W artykule przedstawiono wyniki prac związanych z ustaleniem rzeczywistego przepływu ciekłego metalu w formie podczas procesu odlewania odśrodkowego w indukcyjnym piecu próżniowym firmy SuperCast Linn HighTherm. W procesie odlewania odśrodkowego wykorzystywany jest wpływ siły odśrodkowej na przepływ ciekłego metalu w formie, a następnie powodowany nią wzrost ciśnienia ciekłego – krzepnącego metalu. Dla prędkości wirowania formy równej 250 rpm i odległości formy wynoszącej 0,2 m od osi obrotu wartość siły odśrodkowej działającej na ciekły metal jest 14 razy większa od siły grawitacji. Mimo tak dużej siły często obserwowano w odlewach wykonanych w indukcyjnych piecach odśrodkowych niedolewy, których przyczyny były niewyjaśnione. Działająca w tym przypadku siła grawitacji nie ma istotnego znaczenia na przepływ metalu w wirującej formie. Podczas wykonywania odlewów w piecu odśrodkowym na powierzchni tygla pozostaje pewna ilość metalu wskazująca, że podczas odlewania na ciekły metal muszą oddziaływać minimum dwie siły. Jedną z nich jest siła odśrodkowa wymuszająca przepływ metalu równolegle do promienia wodzącego wirującej formy. Zwrot drugiej siły jest skierowany prostopadle do kierunku promienia wodzącego, na co wskazuje pozostałość zakrzepniętego metalu w kanale wylewowym tygla. Wykorzystując specjalnie dobraną geometrię zestawu odlewniczego, przeprowadzono serię doświadczeń, umożliwiającą zaobserwowanie sposobu przepływu i wypełniania formy. Analiza uzyskanych wyników wskazuje, że podczas symulacji komputerowej prowadzonej w nieinercjalnych układach odniesienia uwzględnienie siły Coriolisa wyjaśnia przepływ metalu podczas odśrodkowego zalewania formy. Przeprowadzone obliczenia komputerowe potwierdziły zgodność z wynikami przeprowadzonych doświadczeń.
This paper presents the results of work on the determination of actual molten metal flow in a mould during centrifugal casting in the SuperCast induction vacuum furnace manufactured by Linn HighTherm. The centrifugal casting process uses the effect of centrifugal force on the flow of liquid metal in the mould with a resulting increase of the liquid and solidifying metal pressure. At the mould rotational speed of 250 rpm and the mould distance of 0.2 m from the rotation axis, the centrifugal force acting on the liquid metal is 14 times higher than the force of gravity. Despite a high force, misruns of unexplained origin have been found in castings from centrifugal induction furnaces. Here the action of gravity is insignificant to the flow of metal within the rotating mould. When casting in centrifugal forces, a certain amount of metal remains on the crucible surface, indicative of a minimum two forces present and acting on the liquid metal during the process. One is the centrifugal force, which prompts the flow of metal in parallel to the radius vector of the rotating mould. The sense of the other force is directed perpendicularly to the radius vector direction, as suggested by the residues of solidified metal in the crucible spout. A specially designed geometry of the casting system has been used in a series of experiments to observe the way in which the flow and casting filling occur. The analysis of produced results suggests that the inclusion of the Coriolis force in the computer-aided simulation of non-inertial reference systems explains the metal flow during centrifugal pouring. The computer calculations have proven the results of the said experiments.
Źródło:
Prace Instytutu Odlewnictwa; 2015, T. 55, nr 1, 1; 23-29
1899-2439
Pojawia się w:
Prace Instytutu Odlewnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A turbulence model for 3-d flows with anisotropic structure of turbulence
Autorzy:
Czernuszenko, W.
Rylov, A.
Powiązania:
https://bibliotekanauki.pl/articles/241364.pdf
Data publikacji:
2005
Wydawca:
Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
Tematy:
3D flow
mathematical model
numerical simulation
open channel flow
turbulence model
Opis:
A new turbulence model for flows in open channels with compound cross-sections is presented. The structure of turbulence in these channels can be anisotropic. This structure is described by the turbulent stress tensor that is presented here as the sum of two tensors, namely, normal and shear stress tensors. The normal and shear turbulent stresses are expressed by the turbulence intensities and the mixing length tensor (MLT), respectively. The turbulence intensities can be learned from measurements or another suitable approaches. One such approach that allows calculating the main component of the normal stresses is presented in the paper. The components of MLT are defined based on a new concept of generic mixing length (GML). The generic mixing length is assumed to depend on both distances; from the nearest wall and from the water surface. To demonstrate how the new model works the basic hydrodynamic equations (parabolic approximation of Reynolds equations) together with the turbulence model are solved. The well-known Patankar and Spalding (1972) algorithm was used when solving these equations. A series of numerical simulations were performed for different components of MLT and different channel geometries.
Źródło:
Archives of Hydro-Engineering and Environmental Mechanics; 2005, 52, 4; 303-320
1231-3726
Pojawia się w:
Archives of Hydro-Engineering and Environmental Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The analysis of separation and methods of three-dimensional flow structure detection in the boundary layer shock wave interaction
Autorzy:
Czerwińska, J.
Powiązania:
https://bibliotekanauki.pl/articles/1954539.pdf
Data publikacji:
1999
Wydawca:
Politechnika Gdańska
Tematy:
shock wave boundary layer interaction
flow separation
3D flow structures
numerical simulations
Opis:
The normal shock wave turbulent boundary layer interaction still draws a great deal of attention as a flow phenomenon. This is due to its profound importance to numerous applications. The understanding of phenomena is crucial for future aims connected with the interaction control. Experimental investigations of the interaction have been carried out since the 1940s. They were aimed however at the determination of such general flow features as: pressure distribution, shock wave configuration or oil visualization of separation structures. In order to better understand the phenomenon, measurements of the entire field are required. At present, such measurements do not exist. A great help is expected from numerical simulations in this respect. There is enough experimental data to check the general features of the flow obtained from calculations. This thesis presents numerical simulations of flow that is assumed: steady, three-dimensional, compressible, viscous and turbulent. Its general aim is to present to what extend the modern numerical methods are able to predict the flow in shock wave turbulent boundary layer interaction including shock induced separation structures. These structures are very sensitive to channel geometry and may be useful in the understanding of separation's development. In order to illustrate the abilities of numerical simulations, one aim of the presented thesis is to investigate the effect of the span-wise depth of the nominally two-dimensional test section. The presented results cast some light on the common problems experienced by typical comparisons of two-dimensional simulations to wind tunnel tests having a three-dimensional nature. The first Chapter presents the basic theory of elementary structures. Considerations of elementary structures of the flow along with their dependencies are necessary for a better understanding of the separation flow structures induced by the boundary layer shock wave interaction. The classification of elementary structures will be presented. In addition, the possible occurrence of bifurcation will also be studied. The second Chapter will be devoted to studying specific cases of transonic turbulent flow. The analysis of numerical results will be bounded to the shock wave structure. Studies shall include: the influence of the numerical scheme, three-dimensional effects connected with the changing width of the channel, a comparison to experiment and the influence of the symmetric boundary condition on the flow prediction in the channel. Finally, the boundary layer influence on the 1-foot structure will also be presented. Chapter three will present the separation structures. Here too a comparison to experiments will be done. Changes in separation structures connected with the width of the channel will be studied. The influence of the symmetry boundary condition will be shown. Finally, the specification of the basic flow structures will be done.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 1999, 3, 1; 53-140
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental and computational studies of stall on a helicopter rotor airfoil
Autorzy:
Surmacz, K.
Powiązania:
https://bibliotekanauki.pl/articles/246413.pdf
Data publikacji:
2016
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
3D flow
CFD
wind tunnel test
oil visualization
stall phenomenon
Opis:
In the case of forward flight of a helicopter, the flow field around rotating blades of a rotor is highly threedimensional and very complex. Helicopter blades work across a wide range of angles of attack and airspeed. The stall occurs on the retreating blade in forward flight and causes dissymmetry of lift on a rotor disc. The investigation of the stall phenomenon has been performed using experimental and computational methods. Experimental analysis was made at the Ohio State University 6’’x 22’’ unsteady transonic wind tunnel. Research in the wind tunnel was performed using two methods: oil visualization (over a wide range of alpha and Ma) and pressure measurements. Computational part of the research has been done using Computational Fluid Dynamics tool. 2- and 3-dimensional calculations performed using ANSYS FLUENT software. In both experimental and computational cases, the 3D flow around a section of a rotor blade based on the SSC-A09 airfoil was analysed. The test article of the research was a section, which was located in the tip region of the main rotor blade of UH-60M Black Hawk helicopter. The research was conducted for a wide range of angles of attack and at several velocities. The most interesting part of the analysis concerned on unsteady flow conditions corresponding to stall.
Źródło:
Journal of KONES; 2016, 23, 3; 511-517
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical simulation of 3D flow in axial turbomachines
Autorzy:
Yershov, S.
Rusanov, A. V.
Gardzielewicz, A.
Lampart, P.
Świrdyczuk, J.
Powiązania:
https://bibliotekanauki.pl/articles/1953978.pdf
Data publikacji:
1998
Wydawca:
Politechnika Gdańska
Tematy:
numerical simulation
axial turbomachines
3D flow
3D viscous compressible flow
Navier-Stokes equation
ENO reconstruction
computational efficiency
computational fluid dynamics CFD
Godunov-type upwind differencing
Opis:
The paper is intended to describe a method for the calculation of 3D viscous compressible (subsonic or supersonic) flow in axial turbomachines described in the form of thin-layer Reynolds-averaged Navier-Stokes equations. The method draws on Godunov-type upwind differencing and ENO reconstruction suggested by Harten (1987), so as to assure monotonicity preservation and high accuracy of computational results. The computational efficiency is achieved thanks to the implementation of a simplified H-type multi-grid approach and delta -form implicit step. Turbulent effects are simulated with the help of a modified algebraic model of Baldwin-Lomax (1978). This method was at the foundation of a computer code-a complex software package to calculate 3D flow in multi-stage turbomachines that allows us to obtain local characteristics, like temperature, pressure, density or velocity distributions, as well as global characteristics, such as flow rates, stage reaction, flow efficiency for the considered turbine/compressor stage. The paper also gives selected results of computation of a number of turbomachinery cascades, showing that these results agree reasonably well with the available experimental data.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 1998, 2, 2; 319-347
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-10 z 24

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