Journal articles: 'Plate obstacle'

1

Lovíšek, Ján. "Optimal design of laminated plate with obstacle." Applications of Mathematics 37, no. 5 (1992): 321–42. http://dx.doi.org/10.21136/am.1992.104514.

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Sundeep, Shivam, Xin Zhang, Siyang Zhong, and Huanxian Bu. "An experimental investigation of turbulent flow over a two-dimensional obstacle on a flat plate." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 263, no. 2 (August 1, 2021): 4459–70. http://dx.doi.org/10.3397/in-2021-2711.

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Aeroacoustic and aerodynamic characteristics of the turbulent boundary layer encountering a large obstacle are experimentally investigated in this paper. Two-dimensional obstacles with a square and a semi-circular cross-section mounted on a flat plate are studied in wind tunnel tests, with particular interests in the shear layer characteristics, wall pressure fluctuations, and far-field noise induced by the obstacles. Synchronized measurements of the far-field noise and the wall pressure fluctuations were conducted using microphone arrays in the far-field and flush-mounted in the plate, respectively. Additionally, the streamwise and wall-normal velocity fluctuations behind the obstacle were measured using the X-wire probe. The measured velocity profiles, spectra, and wall pressure spectra are compared, showing that the rectangular obstacle has a significant impact on both the turbulent flow and far-field noise. The large-scale vortical structures shed from the obstacles can be identified in the wall pressure spectra, the streamwise velocity spectra, and the wall pressure coherence analysis. Within the shear layer, the pairing of vortices occurs and the frequency of the broadband peak in the velocity spectra decreases as the shear layer grows downstream. Further eddy convective velocities of large-scale vortical structures inside the shear layer were analyzed based on the wall pressure fluctuations.

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3

Yan, W. M., R. C. Hsieh, and C. Y. Soong. "Experimental Study of Surface-Mounted Obstacle Effects on Heat Transfer Enhancement by Using Transient Liquid Crystal Thermograph." Journal of Heat Transfer 124, no. 4 (July 16, 2002): 762–69. http://dx.doi.org/10.1115/1.1459729.

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Effects of surface-mounted obstacles on the local heat transfer enhancement of a base plate are investigated by using transient liquid crystal thermograph technique. To explore the geometry effects of short obstacles, the height less than one hydraulic diameter (d), three cross-sectional shapes of obstacles, i.e., circular, square and diamond, with variations in number of obstacles, obstacle spacing, and free-stream Reynolds number are considered. The maximum number of the obstacles in tandem array is 3 and the spacing between obstacles is 1d, 2d, or 4d. The free-stream Reynolds number ranges from 2100 to 4200. The experimental results reveal that the local heat transfer enhancement in front of leading circular and square obstacles are better than the diamond one, while the influenced area by the obstacle of the diamond shape is most remarkable. The present results disclose that an intermediate height (0.5d) of the protruding elements is more beneficial to the heat transfer enhancement in wake of the obstacle. With the sweepback leading edge of the top surface, the diamond and circular obstacles produce vortical flow across the obstacles and thus enhance heat transfer downstream in wake. Increasing Reynolds number leads to an enhancement in heat transfer performance. The number of and the spacing between the obstacles in tandem array are also influential factors to the flow structure and heat transfer enhancement on the basic plate.

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4

Hlaváček, Ivan. "A mixed finite element method for plate bending with a unilateral inner obstacle." Applications of Mathematics 39, no. 1 (1994): 25–44. http://dx.doi.org/10.21136/am.1994.134241.

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5

Murea, Cornel M., and Dan Tiba. "Approximation of a simply supported plate with obstacle." Mathematics and Mechanics of Solids 23, no. 3 (July 17, 2017): 348–58. http://dx.doi.org/10.1177/1081286517718228.

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We discuss an algorithm for the solution of variational inequalities associated with simply supported plates in contact with a rigid obstacle. Our approach has a fixed domain character, uses just linear equations and approximates both the solution and the corresponding coincidence set. Numerical examples are also provided.

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Figueiredo, Isabel N., and Carlos F. Leal. "Sensitivity Analysis of a Nonlinear Obstacle Plate Problem." ESAIM: Control, Optimisation and Calculus of Variations 7 (2002): 135–55. http://dx.doi.org/10.1051/cocv:2002006.

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7

Khludnev, A. M. "Optimal control of a plate over an obstacle." Siberian Mathematical Journal 31, no. 1 (1990): 146–52. http://dx.doi.org/10.1007/bf00971160.

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8

Sturova, I. V. "Propagation of plane surface waves over an underwater obstacle and a submerged plate." Journal of Applied Mechanics and Technical Physics 32, no. 3 (1991): 348–55. http://dx.doi.org/10.1007/bf00852137.

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9

Wang, Tong Bin, Hai Peng Wang, Peng Xiao, Yi Qing Luan, and Li Li. "Substation Inspection Robot Crawler Obstacle-Navigation Platform Complex Environment Research." Applied Mechanics and Materials 415 (September 2013): 65–67. http://dx.doi.org/10.4028/www.scientific.net/amm.415.65.

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state grid electric power robotics laboratory has developed four generations of substation inspection robot, but large scope of substation outdoor and route of road surface condition is complex, the application of inspection robot produced strong constraints, the inspection robot under complex road conditions of obstacle ability put forward higher request. Through this study design of crawler obstacle-navigation platform enhances the obstacle negotiation ability, enable it to adapt to complex terrain conditions. Adopt six crawler structure, can cross the road the road opposite sides-to hold the substation, obstacles such as cable trench cover plate, and good stability, not easy to roll over, to the district of equipment to test the equipment, improve the ability of task. Key words: caterpillar; The obstacle-surmounting platform; Inspection; The robot

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10

Boudiaf, Ahlem, Fetta Danane, Youb Khaled Benkahla, Nabila Labsi, and Abdelkader Boutra. "Heat transfer convection of a power law fluid flow within a parallel plate channel provided with two generating obstacles." Mechanics & Industry 19, no. 2 (2018): 210. http://dx.doi.org/10.1051/meca/2017003.

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The main objective of this work is to examine the heat transfer changes induced by the presence of heat generating obstacles and that for non-Newtonian fluid flow within a parallel plate channel. The effects of the two obstacle height and the distance between them, on the flow structure and Nusselt number are examined. The Finite Volume Method is used to discretize the conservation equations of mass, momentum, and energy. The SIMPLER algorithm is applied to remove the checkerboard pressure problem. The results are discussed in terms of streamlines and the Nusselt number for three combinations of height and separation distance of the two obstacles. Two recirculation zones are observed for all the cases with different intensity varying with the size of the obstacle and the separation distance. Likewise the results show that the heat removal, occurring by the Nusselt number variations, is widely affected by the size of the obstacles as well as by the distance between them.

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11

Miersemann, E., and H. D. Mittelmann. "Stability in Obstacle Problems for the von Karman Plate." SIAM Journal on Mathematical Analysis 23, no. 5 (September 1992): 1099–116. http://dx.doi.org/10.1137/0523061.

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12

Pozzolini, Cédric, and Alain Léger. "A stability result concerning the obstacle problem for a plate." Journal de Mathématiques Pures et Appliquées 90, no. 6 (December 2008): 505–19. http://dx.doi.org/10.1016/j.matpur.2008.07.005.

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13

Bock, Igor, and Jiří Jarušek. "A vibrating thermoelastic plate in a contact with an obstacle." Tatra Mountains Mathematical Publications 63, no. 1 (June 1, 2015): 39–52. http://dx.doi.org/10.1515/tmmp-2015-0019.

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Abstract We deal with a dynamic contact problem for a thermoelastic plate vibrating against a rigid obstacle. Dynamics is described by a hyperbolic variational inequality for deflections. The plate is subjected to a perpendicular force and to a heat source. The parabolic equation for the thermal strain resultant contains the time derivative of the deflection. We formulate a weak solution of the system and verify its existence using the penalization method.

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14

Rudoi, E. M., and A. M. Khludnev. "Unilateral contact of a plate with a thin elastic obstacle." Journal of Applied and Industrial Mathematics 4, no. 3 (July 2010): 389–98. http://dx.doi.org/10.1134/s1990478910030117.

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15

Gustafsson, Tom, Rolf Stenberg, and Juha Videman. "A stabilised finite element method for the plate obstacle problem." BIT Numerical Mathematics 59, no. 1 (September 21, 2018): 97–124. http://dx.doi.org/10.1007/s10543-018-0728-7.

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16

Defrian, Angga, and Zulfakri Zulfakri. "Studi Perbandingan Perilaku Dalam Reaktor Kolom Gelembung Secara Non-Katalitik Dengan Simulasi CFD Terhadap Kadar ME Biodiesel." Rona Teknik Pertanian 13, no. 1 (April 1, 2020): 67–82. http://dx.doi.org/10.17969/rtp.v13i1.15911.

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Abstrak. Biodiesel dihasilkan melalui reaksi transesterifikasi atau reaksi esterifikasi asam lemak bebas dan tergantung dari kualitas minyak nabati yang digunakan sebagai bahan baku. Teknologi produksi biodiesel memiliki 2 metode yaitu metode katalis dan non katalis. Salah satu metoda produksi biodiesel tanpa katalis adalah metoda superheated methanol vapor (SMV). Namun metode inimenghasilkan kadar biodiesel yang rendah dari SNI. Salah satu cara untuk meningkatkan kadar biodiesel dengan meningkatkan luas kontak permukaan antara gelembung metanol dengan minyak. Hal ini dilakukan dengan memberikan perforated plate (obstacle) di dalam kolom reaktor. Perancangan desain obstacle sangat mempengaruhi luas kontak permukaan antara metanol uap dan minyak. Beberapa jenis obstacle yang dirancang di simulasikan dengan metode Computational Fluid Dynamics (CFD), karena CFD dapat menggambarkan distribusi gelembung di dalam kolom reaktor, sehingga pembuatan obstacle dapat lebih tepat dan memudahkan menganalisa perilaku gelembung di dalam kolom reaktor. Hasil simulasi di-dapatkan luas kontak permukaan yang tertinggi menunjukkan desain obstacle A-4 dengan nilai sebesar 0.013635 m2/det. Namun kadar metil ester pada obstacle tersebut masih rendah dibandingkan dengan SNI yaitu sebesar 67.73% (w/w). Untuk kadar metil ester yang mendekati SNI adalah obstacle D-4 yaitu 94.55 % (w/w).Comparative Study Of Behavior In Non-Catalytic Bullet Column Reactors With CFD Simulation on Content me biodieselAbstract. Biodiesel is produced through transesterification reaction triglycerides or esterification of free fatty acids depending on the FFA content of the feedstock. The reaction normally requires a catalyst, even though the non-catalytic reaction has attracted significant attention recently. One of the non-catalytic method by using superheated methanol vapor (SMV). However, this method still has a low reaction rate and thereby needs to be improved by increasing the surface contact area between methanol vapor and oil. In this study, the utilization of a perforated plate (obstacle) in the reactor column was studied using computational fluid dynamics (CFD). Several types of obstacles were designed and their influence on the reaction rate was evaluated through CFD simulation. The result shows that obstacle design A4 gave the highest contact surface (0.013635 m2/s), even though methyl ester concentration in the reaction product is still low (67.73 %w/w). For methyl esters which are close to SNI is design obstacle D-4, which is 94.55 %(w/w).

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17

Matsuura, K., and M. Nakano. "Disorganization of a hole tone feedback loop by an axisymmetric obstacle on a downstream end plate." Journal of Fluid Mechanics 757 (September 29, 2014): 908–42. http://dx.doi.org/10.1017/jfm.2014.504.

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AbstractThis study investigates the suppression of the sound produced when a jet, issued from a circular nozzle or hole in a plate, goes through a similar hole in a second plate. The sound, known as a hole tone, is encountered in many practical engineering situations. The mean velocity of the air jet $\def \xmlpi #1{}\def \mathsfbi #1{\boldsymbol {\mathsf {#1}}}\let \le =\leqslant \let \leq =\leqslant \let \ge =\geqslant \let \geq =\geqslant \def \Pr {\mathit {Pr}}\def \Fr {\mathit {Fr}}\def \Rey {\mathit {Re}}u_0$ was $6\text {--}12\ \mathrm{m}\ {\mathrm{s}}^{-1}$. The nozzle and the end plate hole both had a diameter of 51 mm, and the impingement length $L_{im}$ between the nozzle and the end plate was 50–90 mm. We propose a novel passive control method of suppressing the tone with an axisymmetric obstacle on the end plate. We find that the effect of the obstacle is well described by the combination ($W/L_{im}$, $h$) where $W$ is the distance from the edge of the end plate hole to the inner wall of the obstacle, and $h$ is the obstacle height. The tone is suppressed when backflows from the obstacle affect the jet shear layers near the nozzle exit. We do a direct sound computation for a typical case where the tone is successfully suppressed. Axisymmetric uniformity observed in the uncontrolled case is broken almost completely in the controlled case. The destruction is maintained by the process in which three-dimensional vortices in the jet shear layers convect downstream, interact with the obstacle and recursively disturb the jet flow from the nozzle exit. While regions near the edge of the end plate hole are responsible for producing the sound in the controlled case as well as in the uncontrolled case, acoustic power in the controlled case is much lower than in the uncontrolled case because of the disorganized state.

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18

Halynskyi, V. P. "Calculation of the interaction of a supersonic jet with a flat obstacle inclined off the jet axis." Technical mechanics 2020, no. 4 (December 10, 2020): 72–81. http://dx.doi.org/10.15407/itm2020.04.072.

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This paper presents results of a numerical solution of the model problem of the interaction of a plane supersonic jet with a semiinfinite flat plate inclinable off the jet axis. The paper is devoted to the study of the flow parameters in the jet flow field and the pressure distribution over the plate surface as a function of the plate inclination. The aim of the paper is to obtain the flow parameters in the jet flow field and the pressure distribution over the plate surface as a function of the plate inclination angle and front edge position. To obtain numerical results, marching algorithms in the inviscid gas and viscous layer approximation were used. At specified values of the supersonic underexpanded/overexpanded jet parameters, calculations were conducted in the plate inclination angle range of 0 to 20?. The position of the plate front edge was specified by two coordinates: a longitudinal and a transversal one, and in the parametric calculations the transversal coordinate was varied at a fixed longitudinal one. The cross-section at which the nonuniform jet field starts to interact with the plate was determined as a function of both the plate front edge position and the plate inclination. The numerical study showed the following: with increasing plate inclination angle, the oscillation frequencies of the flow parameters in the jet flow field and on the plate surface decrease, while their oscillation amplitudes increase, and the position of the maximum pressure point on the plate surface depends on the initial position of the plate front edge and may not coincide with the cross-section at which the jet–plate interaction starts. The results obtained may be used in qualitative estimation of the effect of different parameters in the jet flow field.

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19

NING, JIANGUO, CHENG WANG, and JIE LU. "INFLUENCE OF OBSTACLES ON FLAME PROPAGATION OF MULTI-COMPOSITION MIXTURE GAS." Modern Physics Letters B 19, no. 28n29 (December 20, 2005): 1687–90. http://dx.doi.org/10.1142/s0217984905010220.

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In this paper, we experiment with city coal gas/air mixture in enclosed duct to investigate the acceleration mechanism of orifice plate obstacles on flame and its influence on explosion overpressure. Experimental results indicate that obstacle-induced turbulence can continually accelerate flame during its propagation and enhance explosion overpressure, and that flame acceleration is due to the unburned mixture heated by leading compression wave in front of flame front and the positive feedback of obstacle-induced turbulent zone to combustion process. Based on multi-material cell program, we adopt two-step chemical reaction model to simulate explosion process of city coal gas-air mixture in the duct, and the results agree well with the experimental ones.

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20

Hlaváček, Ivan. "Weight minimization of an elastic plate with a unilateral inner obstacle by a mixed finite element method." Applications of Mathematics 39, no. 5 (1994): 375–94. http://dx.doi.org/10.21136/am.1994.134266.

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21

Kazuo, Matsuura, and Nakano Masami. "1173 DISORGANIZATION OF A HOLE TONE FEEDBACK LOOP BY AN AXISYMMETRIC OBSTACLE ON A DOWNSTREAM END PLATE." Proceedings of the International Conference on Jets, Wakes and Separated Flows (ICJWSF) 2013.4 (2013): _1173–1_—_1173–6_. http://dx.doi.org/10.1299/jsmeicjwsf.2013.4._1173-1_.

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22

Kristensson, Gerhard. "Electromagnetic scattering by a bounded obstacle in a parallel plate waveguide." Journal of Quantitative Spectroscopy and Radiative Transfer 123 (July 2013): 92–102. http://dx.doi.org/10.1016/j.jqsrt.2013.01.018.

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23

Sarac, Betul, Hussain Al-Madani, and Teoman Ayhan. "Heat transfer from a short plate behind an obstacle in tandem." Energy Conversion and Management 52, no. 10 (September 2011): 3147–58. http://dx.doi.org/10.1016/j.enconman.2011.04.019.

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24

Eibeck, P. A. "An Experimental Study of the Flow Downstream of a Circular and Tapered Cylinder." Journal of Fluids Engineering 112, no. 4 (December 1, 1990): 393–401. http://dx.doi.org/10.1115/1.2909416.

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The flow downstream of the intersection of both a circular and a tapered cylinder with a flat plate was examined at ReD = 1.3 × 105 using surface visualization, five-hole-probe anemometry, and flow visualization. A pair of large, counter-rotating swirls with common flow away from the wall and with centers over one diameter away from the wall was present downstream of both obstacles. It is suggested that the large, swirling pair are formed in the near wake of an obstacle that is exposed to symmetrical channel flow. A pair of smaller counter-rotating vortices with common flow toward the wall was observed embedded in the wall-shear flow eight diameters downstream of the tapered cylinder. This implies that the legs of the horseshoe vortex system only propagate downstream behind the streamlined obstacle shape.

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25

Yan, Guan, and Bernadette Miara. "Mathematical justification of the obstacle problem in the case of piezoelectric plate." Asymptotic Analysis 96, no. 3-4 (February 12, 2016): 283–308. http://dx.doi.org/10.3233/asy-151339.

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26

Han, Weimin, Dongying Hua, and Lieheng Wang. "Nonconforming Finite Element Methods for a Clamped Plate with Elastic Unilateral Obstacle." Journal of Integral Equations and Applications 18, no. 2 (June 2006): 267–84. http://dx.doi.org/10.1216/jiea/1181075382.

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27

KIM, Jun-Ho, Koichi ISHIZAKA, Satoshi WATANABE, and Akinori FURUKAWA. "2436 Suppression of Cavitaiton Surge of Pump Inducer by Inserting Obstacle Plate." Proceedings of the JSME annual meeting 2006.2 (2006): 191–92. http://dx.doi.org/10.1299/jsmemecjo.2006.2.0_191.

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28

KIM, Jun-ho, Masao ISHIZAKI, Naoki ENOMOTO, Koichi ISHIZAKA, Satoshi WATANABE, and Akinori FURUKAWA. "Suppression of Cavitation Surge of Inducer by Inserting Axi-asymmetric Obstacle Plate." Proceedings of the Fluids engineering conference 2004 (2004): 37. http://dx.doi.org/10.1299/jsmefed.2004.37.

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29

Guan, Yan. "Mathematical justification of an obstacle problem in the case of a plate." Chinese Annals of Mathematics, Series B 38, no. 5 (September 2017): 1047–58. http://dx.doi.org/10.1007/s11401-017-1021-9.

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30

Tosone, C., and A. Maceri. "The Clamped Plate with Elastic Unilateral Obstacles: A Finite Element Approach." Mathematical Models and Methods in Applied Sciences 13, no. 09 (September 2003): 1231–43. http://dx.doi.org/10.1142/s021820250300288x.

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We consider the problem of a clamped elastic thin plate unilaterally constrained by an elastic obstacle. A discrete, finite element approach to solve this nonlinear problem is given here and its convergence properties are discussed.

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31

VOSPER, S. B., I. P. CASTRO, W. H. SNYDER, and S. D. MOBBS. "Experimental studies of strongly stratified flow past three-dimensional orography." Journal of Fluid Mechanics 390 (July 10, 1999): 223–49. http://dx.doi.org/10.1017/s0022112099005133.

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Stably stratified flows past three-dimensional orography have been investigated using a stratified towing tank. Flows past idealized axisymmetric orography in which the Froude number, Fh=U/Nh (where U is the towing speed, N is the buoyancy frequency and h is the height of the obstacle) is less than unity have been studied. The orography considered consists of two sizes of hemisphere and two cones of different slope. For all the obstacles measurements show that as Fh decreases, the drag coefficient increases, reaching between 2.8 and 5.4 times the value in neutral flow (depending on obstacle shape) for Fh[les ]0.25. Local maxima and minima in the drag also occur. These are due to the finite depth of the tank and can be explained by linear gravity-wave theory. Flow visualization reveals a lee wave train downstream in which the wave amplitude is O(Fhh), the smallest wave amplitude occurring for the steepest cone. Measurements show that for all the obstacles, the dividing-streamline height, zs, is described reasonably well by the formula zs/h=1−Fh. Flow visualization and acoustic Doppler velocimeter measurements in the wake of the obstacles show that vortex shedding occurs when Fh[les ]0.4 and that the period of the vortex shedding is independent of height. Based on velocity measurements in the wake of both sizes of hemisphere (plus two additional smaller hemispheres), it is shown that a blockage-corrected Strouhal number, S2c =fL2/Uc, collapses onto a single curve when plotted against the effective Froude number, Fhc=Uc/Nh. Here, Uc is the blockage-corrected free-stream speed based on mass-flux considerations, f is the vortex shedding frequency and L2 is the obstacle width at a height zs/2. Collapse of the data is also obtained for the two different shapes of cone and for additional measurements made in the wake of triangular and rectangular at plates. Indeed, the values of S2c for all these obstacles are similar and this suggests that despite the fact that the obstacle widths vary with height, a single length scale determines the vortex-street dynamics. Experiments conducted using a splitter plate indicate that the shedding mechanism provides a major contribution to the total drag (∼25%). The addition of an upstream pointing ‘verge region’ to a hemisphere is also shown to increase the drag significantly in strongly stratified flow. Possible mechanisms for this are discussed.

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32

Furtsev, A. I. "The unilateral contact problem for a Timoshenko plate and a thin elastic obstacle." Sibirskie Elektronnye Matematicheskie Izvestiya 17 (March 10, 2020): 364–79. http://dx.doi.org/10.33048/semi.2020.17.023.

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33

Spall, R. E., and M. R. Malik. "The Linear Stability of a Flat Plate Boundary-Layer Approaching a Cylindrical Obstacle." Journal of Fluids Engineering 114, no. 3 (September 1, 1992): 306–12. http://dx.doi.org/10.1115/1.2910031.

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The linear stability of the low-speed three-dimensional flow over a flat plate with an attached cylinder is studied. The region of interest is upstream of the initial separation point and includes the effects of both adverse and favorable pressure gradients, as well as crossflow. The resulting boundary-layer is subject to both the Tollmien-Schlichting (TS) and crossflow instabilities. Linear stability calculations, using N-factor correlations, indicate that the transition process would be dominated by TS instabilities, although for low frequencies crossflow-type disturbances are important.

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34

Miersemann, E., and H. D. Mittelmann. "On the Stability in Obstacle Problems with Applications to the Beam and Plate." ZAMM - Journal of Applied Mathematics and Mechanics / Zeitschrift für Angewandte Mathematik und Mechanik 71, no. 9 (1991): 311–21. http://dx.doi.org/10.1002/zamm.19910710902.

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35

Furtsev, A. I. "On Contact Between a Thin Obstacle and a Plate Containing a Thin Inclusion." Journal of Mathematical Sciences 237, no. 4 (January 31, 2019): 530–45. http://dx.doi.org/10.1007/s10958-019-04179-z.

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36

Feng, Fang, Weimin Han, and Jianguo Huang. "The virtual element method for an obstacle problem of a Kirchhoff-Love plate." Communications in Nonlinear Science and Numerical Simulation 103 (December 2021): 106008. http://dx.doi.org/10.1016/j.cnsns.2021.106008.

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37

Borrelli, Alessandra, Giulia Giantesio, and Maria Cristina Patria. "Effect of temperature on the MHD stagnation-point flow past an isothermal plate for a Boussinesquian Newtonian and micropolar fluid." International Journal of Numerical Methods for Heat & Fluid Flow 28, no. 6 (June 4, 2018): 1315–34. http://dx.doi.org/10.1108/hff-05-2017-0186.

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Purpose This paper aims to analyze the steady two-dimensional stagnation-point flow of an electrically conducting Newtonian or micropolar fluid when the obstacle is uniformly heated. Design/methodology/approach The governing boundary layer equations are transformed into a system of ordinary differential equations using appropriate similarity transformations. Some analytical considerations about existence and uniqueness of the solution are obtained. The system is then solved numerically using the bvp4c function in MATLAB. Findings If the temperature of the obstacle Tw coincides with the environment temperature T0, then the motion reduces to the usual orthogonal stagnation-point flow; if Tw = T0, then it is necessary to include in the similarity function describing the velocity an oblique part due to the temperature. Also, the presence of a uniform external magnetic field orthogonal to the obstacle is examined. In all cases, the motion is reduced to a system of nonlinear ordinary differential equations with boundary conditions, whose solution is discussed numerically when the Prandtl and the Hartmann number varies. Originality/value The present results are original and new for the problem of magnetohydrodynamic mixed convection in the plane stagnation-point flow of a Newtonian or a micropolar fluid over a vertical flat plate. At infinity, the motion approaches the orthogonal stagnation-point flow of an inviscid fluid; the effect of an uniform external magnetic field is considered, and the obstacle has a uniform temperature.

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38

Chen, T., Y. F. Gu, C. P. Li, and Y. Q. Qiao. "Stamping and Springback of PEMFC Metal Bipolar Plate." Advanced Materials Research 215 (March 2011): 1–4. http://dx.doi.org/10.4028/www.scientific.net/amr.215.1.

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Recently, the key obstacle of proton exchange membrane fuel cell (PEMFC) development is the higher manufacturing cost. In a PEMFC stack, bipolar plate is a main and multifunctional component, which accounts for the 60%-80% of total weight and 30%-45% of stack cost. So the forming cost of bipolar plate will influence the entire PEMFC manufacturing costs. Metal bipolar plate, which can satisfy the requirement, can be used for mass production to reduce the cost. Finite element analysis (FEA) of stamping and springback for metal bipolar plate is studied by ANSYS/LS-DYNA to be feasible.

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39

Bock, Igor, and Mária Kečkemétyová. "An Optimal Control Problem for A Viscoelastic Plate in a Dynamic Contact with an Obstacle." Tatra Mountains Mathematical Publications 71, no. 1 (December 1, 2018): 27–37. http://dx.doi.org/10.2478/tmmp-2018-0003.

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Abstract We deal with an optimal control problem governed by a nonlinear hyperbolic initial-boundary value problem describing the perpendicular vibrations of a simply supported anisotropic viscoelastic plate against a rigid obstacle. A variable thickness of a plate plays the role of a control variable. We verify the existence of an optimal thickness function.

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40

Madić, Dejan, Milan Cvetković, Boris Popović, Dragan Marinković, Danilo Radanović, and Nebojša Trajković. "EFFECTS OF DEVELOPMENTAL GYMNASTICS ON MOTOR FITNESS IN PRESCHOOL GIRLS." Facta Universitatis, Series: Physical Education and Sport 16, no. 1 (July 24, 2018): 011. http://dx.doi.org/10.22190/fupes180122002m.

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The aim of this research was to determine the effects of developmental gymnastics on motor fitness in preschool girls. This study was performed on a sample of 56 healthy preschool girls that were divided into two groups, a developmental training group and a control group. Motor fitness tests were used from several test batteries: the 20m dash, Obstacle course backwards, Standing broad jump, Arm plate tapping, Seated straddle stretch, Bent arm hang, Sit ups. The basic characteristics of developmental gymnastic training process consisted of station and circuit work and obstacle courses two times a week lasting for 60 min with intensity around 160-180bpm. After the training intervention, the training group showed significant (p < 0.05) improvements in almost all the parameters analyzed (e.g., Obstacle course backwards; Standing broad jump; Arm plate tapping; Bent arm hang and Sit ups) compared with pretest values, with percentages of change and ES ranging from 13.3% to 48.2% and 0.64 (moderate) to 1.20 (large), respectively. No significant changes were observed in the control group after the training intervention except for the standing broad jump and arm plate tapping (p < 0.05). This study provides evidence on the effectiveness of developmental gymnastics programs for the optimal development of young children’s motor fitness.

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KISHII, Yoshiaki, Hiroki SUZUKI, and Shinsuke MOCHIZUKI. "1523 Measurement of the Wall Shear Stress used a Thin Circular Plate as Obstacle." Proceedings of the Fluids engineering conference 2015 (2015): _1523–1_—_1523–4_. http://dx.doi.org/10.1299/jsmefed.2015._1523-1_.

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Wang, Jian Sheng, and Cui Wu. "Flow and Heat Transfer Characteristics in a Channel Periodically Fitted with Blocks and Inclined Plates." Applied Mechanics and Materials 66-68 (July 2011): 299–306. http://dx.doi.org/10.4028/www.scientific.net/amm.66-68.299.

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A numerical investigation in the CFD method of the heat transfer characteristics and the self-sustained oscillation flow is conducted in a grooved channel with periodic mounted inclined plate.Control of low Reynolds number range(600-1600), two-dimensional, unsteady laminar flow was analyzed .Various physical and flow arrangements have been considered as plate length, plate position and Reynolds number .A comparison among different channels was made for streamlines、history of cartesian velocity component in the x-direction and Nusselt number(Nu)．Compared with the results got by the no plates case, the heat transfer has been enhanced in channel that installation of a inlined plate for all Reynolds number.At higher Reynolds number(Reynolds number over the critical Reynolds number), the enhancement of heat transfer is more marked ,that because it can not only modify the direction of the flow towards the obstacle faces to be cooled ,and activate the self-oscillations using inclined plates placed periodically.

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Chashechkin, Yuli D., and Iaroslav V. Zagumennyi. "2D Hydrodynamics of a Plate: From Creeping Flow to Transient Vortex Regimes." Fluids 6, no. 9 (August 31, 2021): 310. http://dx.doi.org/10.3390/fluids6090310.

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Based on the numerical and experimental visualization methods, the flow patterns around a uniformly moving plate located at an arbitrary angle of attack are studied. The study is based on the fundamental equations of continuity, momentum and stratifying substance transport for the cases of strong and weak stratified fluids, as well as potential and actually homogeneous ones. The visualization technique and computation codes were compiled bearing in mind conditions of internal waves, vortices, upstream, and downstream wakes registration, as well as the resolution of ligaments in the form of thin interfaces in schlieren flow images. The analysis was carried out in a unified mathematical formulation for a wide range of plate motion parameters, including slow diffusion-induced flows and fast transient vortex flows. The patterns of formation and subsequent evolution of the basic structural components, such as upstream disturbances, downstream wake, internal waves, vortices, and ligaments, are described both at start of motion and subsequent uniform movement of the plate. Calculations of forces acting on the obstacle in the flow were carried out to study effects of variations in fluid properties, flow conditions and plate parameters on the dynamic characteristics of the obstacle. The numerical and experimental results on the flow patterns around a plate are in a good agreement with each other for different flow regimes.

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GALLAS, JASON A. C., HANS J. HERRMANN, and STEFAN SOKOLOWSKI. "GRANULAR MEDIA ON A VIBRATING PLATE: A MOLECULAR DYNAMICS SIMULATION." International Journal of Modern Physics B 07, no. 09n10 (April 20, 1993): 1779–88. http://dx.doi.org/10.1142/s0217979293002572.

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When sand or other granular materials are shaken, poured or sheared many intriguing phenomena can be observed. We will model the granular medium by a packing of elastic spheres and simulate it via Molecular Dynamics. Dissipation of energy and shear friction at collisions are included. The onset of fluidization can be determined and is in good agreement with experiments. On a vibrating plate we observe the formation of convection cells due to walls or amplitude modulations. Density and velocity profiles on conveyor belts are measured and the influence of an obstacle discussed. We mention various types of rheology for flow down an inclined chute or through a pipe and outflowing containers.

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Ali, Sulaiman, and Djatmiko Ichsani. "STUDI SIMULASI NUMERIK PENGARUH PENAMBAHAN FINS SETENGAH SILINDER DISUSUN SECARA STAGGERED TERHADAP KINERJA KOLEKTOR SURYA PEMANAS UDARA DENGAN PLAT PENYERAP V-CORRUGATED." POROS 15, no. 1 (January 6, 2018): 35. http://dx.doi.org/10.24912/poros.v15i1.1253.

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Abstract: The use of solar energy by using solar collector has been extensively researched to optimize existing solar energy source, one of the methods to utilize solar energy is by using solar collector and has been widely utilized by humans in the drying process. To create a solar collector with optimum performance the thermal efficiency needs to be increased, as for increasing the thermal efficiency of solar collector one by extending the absorption field and increasing the convection heat transfer coefficient by creating a turbulent flow inside the solar collector duct, the flow turbulence can be achieved by Provides obstacle and fins disturbance to the flow direction of the working fluid under the hot absorber plate. This research was conducted with 3D Steady flow numerical simulation with turbulence viscos k-omega SST. The objective of this research is to know the optimum diameter and spacing of fins variation with 6mm, 8mm, and 10mm fins diameter, and variation of fins distance to obstacle 0,25L; 0.5L and 0.75L. The result of numerical simulation optimum fins is determined by the smallest ratio of ΔP/ΔT and this research continued to the experiment. The solar collector used in this study is a solar collector using a v-corrugated absorber plate with triangular obstacle and half cylindrical fins arranged staggered inside a solar collector duct. The results obtained from this research is, the most optimum half cylinder fins are 6 mm fins with a fins distance to obstacle 0.75L.

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TANAKA, Norio, Nobuyuki TAMAI, and Yuusuke HIROSAWA. "The effect of stratification on the flow around a hemispheric obstacle on a flat plate." JOURNAL OF THE FLOW VISUALIZATION SOCIETY OF JAPAN 8, no. 30 (1988): 133–36. http://dx.doi.org/10.3154/jvs1981.8.133.

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Huanchun, Sun, and Yao Weian. "Virtual boundary element-linear complementary equations for solving the elastic obstacle problems of thin plate." Finite Elements in Analysis and Design 27, no. 2 (October 1997): 153–61. http://dx.doi.org/10.1016/s0168-874x(96)00087-x.

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KIM, Jun-Ho, Koichi ISHIZAKA, Masao ISHIZAKI, Satoshi WATANABE, and Akinori FURUKAWA. "Suppression Effect of Upstream Installed Ring-Shaped Obstacle Plate on Cavitation Surge in Pump Inducers." Journal of Fluid Science and Technology 3, no. 1 (2008): 1–10. http://dx.doi.org/10.1299/jfst.3.1.

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Shi, Dongyang, and Lifang Pei. "Double set parameter finite element method for two-sided displacement obstacle problem of clamped plate." Journal of Mathematical Analysis and Applications 436, no. 1 (April 2016): 203–16. http://dx.doi.org/10.1016/j.jmaa.2015.11.004.

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Jenyongsak, Papangkorn, and Piyatida Trinuruk. "Investigation of thermal stratification in a thermal storage tank with a curve edge obstacle plate." IOP Conference Series: Materials Science and Engineering 1137, no. 1 (May 1, 2021): 012076. http://dx.doi.org/10.1088/1757-899x/1137/1/012076.

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Journal articles on the topic 'Plate obstacle'

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