Temat: boundary layer interaction - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Numerical investigation of the basilar membrane vibration induced by the unsteady fluid flow in the human inner ear
Autorzy:: Wahl, Philipp
Ziegler, Pascal
Eberhard, Peter
Powiązania:: https://bibliotekanauki.pl/articles/1845019.pdf
Data publikacji:: 2020
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: human cochlea
basilar membrane
unsteady viscous fluid flow
fluid-structure interaction
pressure-displacement-based fluid element
viscous boundary layer
tonotopy
auditory threshold
ludzki ślimak
membrana podstawna
niestabilny przepływ cieczy lepkiej
interakcja płyn-struktura
element hydrauliczny oparty na ciśnieniu wyporowym
lepka warstwa graniczna
tonotopia
próg słyszalności
Opis:: For a deeper understanding of the inner ear dynamics, a Finite-Element model of the human cochlea is developed. To describe the unsteady, viscous creeping flow of the liquid, a pressure-displacement-based Finite-Element formulation is used. This allows one to efficiently compute the basilar membrane vibrations resulting from the fluid-structure interaction leading to hearing nerve stimulation. The results show the formation of a traveling wave on the basilar membrane propagating with decreasing velocity towards the peaking at a frequency dependent position. This tonotopic behavior allows the brain to distinguish between sounds of different frequencies. Additionally, not only the middle ear, but also the transfer behavior of the cochlea contributes to the frequency dependence of the auditory threshold. Furthermore, the fluid velocity and pressure fields show the effect of viscous damping forces and allow us to deeper understand the formation of the pressure difference, responsible to excite the basilar membrane.
Źródło:: Archive of Mechanical Engineering; 2020, LXVII, 4; 381-414
0004-0738
Pojawia się w:: Archive of Mechanical Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Identification of the boundary layer shock wave interaction type in transonic flow regime
Autorzy:: Placek, R.
Stryczniewicz, W.
Powiązania:: https://bibliotekanauki.pl/articles/242396.pdf
Data publikacji:: 2016
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: transonic flow
wind tunnel techniques
shock wave
airfoil
boundary layer interaction
Opis:: The paper presents various approaches to wind tunnel data analysis when identifying the shock wave boundary layer interaction type. The investigation was carried out in the transonic flow regime in the N-3 Wind Tunnel of Institute of Aviation. The Mach number was 0.7 and Reynolds number was approximate equal 2.85 million. The object of the research was a laminar airfoil in configuration without and with turbuliser device mounted on the upper model surface. In order to achieve turbulent boundary layer in front of the shock wave the carborundum strip was used. The effect of the varying angle of incidence on the flow filed was investigated. During experimental research, different means and test methods were applied (pressure measurements, Schlieren and oil visualisation, Particle Image Velocimetry (PIV), hot-film anemometry). The results were analysed in terms of the shock wave boundary interaction type. Most of results were in good agreement with theoretical models reported in the literature. The study showed that combination of various measurement techniques should be used in the shock wave boundary investigations in order to achieve more consistent and reliable conclusions. The results of the presented research can also be used for better understanding other mechanisms i.e. the boundary layer shock wave separation process in transonic flow regime.
Źródło:: Journal of KONES; 2016, 23, 2; 285-292
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Studies of vertical coarse aerosol fluxes in the boundary layer over the Baltic Sea
Autorzy:: Petelski, T.
Markuszewski, P.
Makuch, P.
Jankowski, A.
Rozwadowska, A.
Powiązania:: https://bibliotekanauki.pl/articles/48277.pdf
Data publikacji:: 2014
Wydawca:: Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:: aerosol flux
sea aerosol
wind speed
air-sea interaction
marine boundary layer
aerosol concentration
Baltic Sea
Źródło:: Oceanologia; 2014, 56, 4
0078-3234
Pojawia się w:: Oceanologia
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Transonic flows, shock wave-turbulent boundary layer interaction
Autorzy:: Doerffer, P.
Kaczyński, J.
Powiązania:: https://bibliotekanauki.pl/articles/1953982.pdf
Data publikacji:: 1998
Wydawca:: Politechnika Gdańska
Tematy:: transonic flows
shock waves
turbulent boundary layer interaction
computational fluid dynamics CFD
CFD
flow configurations
profile flow
helicopter rotor
hovering
forward flight
internal flows
Opis:: Shock wave-boundary layer interaction is one of the most important phenomenon in transonic flows. Due to its complexity it is difficult as well for experimental as for numerical study. The growing potential of CFD is therefore of great importance. Different aspects of shock wave-boundary layer interaction should be studied in different flow configurations. Therefore results concerning profile flow, helicopter rotor at hovering and forward flight and internal flows are presented in this paper. These are to illustrate our ability in CFD in general. Besides flow simulation the development of codes is carried out.
Źródło:: TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 1998, 2, 2; 271-286
1428-6394
Pojawia się w:: TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

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

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