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Статті в журналах з теми "Flow body"

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Автор: Grafiati

Опубліковано: 30 травня 2022

Оновлено: 31 травня 2022

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1

Beraia, M., and G. Beraia. "Energy/information dissipation and blood flow in human body." Cardiology Research and Reports 3, no. 2 (May 10, 2021): 01–08. http://dx.doi.org/10.31579/2692-9759/017.

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Анотація:

The amount of work done to displace blood in systemic arteries and capillaries exceeds the work done by the left ventricle. Besides, at the heartbeat, electromagnetic energy dissipates from the heart to the whole human body. For the problem study, the dielectric spectroscopy method was used. Ringer’s, amino acid solution, and heparinized venous blood were affected by the external electromagnetic oscillations (100-65000Hz, 1-8MHz.) in 17 healthy individuals. Correlations were noted between the initial and induced signal forms/frequencies according to the impedance of the system. The electric impulse from the heart initiates an oscillating electric field around the charged cells/particles and an emerging repulsing electromagnetic force, based on the electroacoustic phenomena, promotes the blood flow, in addition to the pulse pressure from the myocardial contraction. Blood conduces mechanical, electromagnetic waves of different frequencies and transmits energy/information to implement the spontaneous chemical processes in the human body.

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2

BISWAS, Debasish, and Tomohiko JIMBO. "J101014 Studies on Flow Induced Vibration of Cylindrical Body Based on Coupled Solution of Flow and Structure." Proceedings of Mechanical Engineering Congress, Japan 2012 (2012): _J101014–1—_J101014–5. http://dx.doi.org/10.1299/jsmemecj.2012._j101014-1.

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3

Smith, F. T., and P. Servini. "Channel Flow Past A Near-Wall Body." Quarterly Journal of Mechanics and Applied Mathematics 72, no. 3 (June 8, 2019): 359–85. http://dx.doi.org/10.1093/qjmam/hbz009.

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Summary Near-wall behaviour arising when a finite sized body moves in a channel flow is investigated for high flow rates. This is over the interactive-flow length scale that admits considerable upstream influence. The focus is first on quasi-steady two-dimensional flow past a thin body in the outer reaches of one of the viscous wall layers. The jump conditions near the front of the body play an important part in the whole solution which involves an unusual multi-structured flow due to the presence of the body: flows above, below, ahead of and behind the body interact fully. Analytical solutions are presented and the repercussions for shorter and longer bodies are then examined. Second, implications are followed through for the movement of a free body in a dynamic fluid–body interaction. Particular key findings are that instability persists for all body lengths, the growth rate decreases like the $1/4$ power of distance as the body approaches the wall, and lift production on the body is dominated by high pressures from an unexpected flow region emerging on the front of the body.

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4

Murad, Abdullah. "Inviscid Uniform Shear Flow past a Smooth Concave Body." International Journal of Engineering Mathematics 2014 (July 23, 2014): 1–7. http://dx.doi.org/10.1155/2014/426593.

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Uniform shear flow of an incompressible inviscid fluid past a two-dimensional smooth concave body is studied; a stream function for resulting flow is obtained. Results for the same flow past a circular cylinder or a circular arc or a kidney-shaped body are presented as special cases of the main result. Also, a stream function for resulting flow around the same body is presented for an oncoming flow which is the combination of a uniform stream and a uniform shear flow. Possible fields of applications of this study include water flows past river islands, the shapes of which deviate from circular or elliptical shape and have a concave region, or past circular arc-shaped river islands and air flows past concave or circular arc-shaped obstacles near the ground.

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5

SUD, V., and G. SEKHON. "Arterial flow under periodic body acceleration." Bulletin of Mathematical Biology 47, no. 1 (1985): 35–52. http://dx.doi.org/10.1016/s0092-8240(85)90004-7.

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6

Avent, James. "Flow Cytometry in Body Fluid Analysis." Clinics in Laboratory Medicine 5, no. 2 (June 1985): 389–403. http://dx.doi.org/10.1016/s0272-2712(18)30876-x.

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7

Svettsov, V. V. "Nonstationary supersonic flow around a body." Technical Physics 44, no. 12 (December 1999): 1484–86. http://dx.doi.org/10.1134/1.1259554.

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8

Sud, V. K., and G. S. Sekhon. "Arterial flow under periodic body acceleration." Bulletin of Mathematical Biology 47, no. 1 (January 1985): 35–52. http://dx.doi.org/10.1007/bf02459645.

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9

Chaturani, P., and A. S. A. Wassf Isaac. "Blood flow with body acceleration forces." International Journal of Engineering Science 33, no. 12 (October 1995): 1807–20. http://dx.doi.org/10.1016/0020-7225(95)00027-u.

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10

Matsumoto, M., N. Shiraishi, and H. Shirato. "Bluff body aerodynamics in pulsating flow." Journal of Wind Engineering and Industrial Aerodynamics 28, no. 1-3 (August 1988): 261–70. http://dx.doi.org/10.1016/0167-6105(88)90122-5.

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11

Krajnovic´, Sinisˇa, and Lars Davidson. "Numerical Study of the Flow Around a Bus-Shaped Body." Journal of Fluids Engineering 125, no. 3 (May 1, 2003): 500–509. http://dx.doi.org/10.1115/1.1567305.

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Анотація:

Flow around a simplified bus is analyzed using large-eddy simulation. At the Reynolds number of 0.21×106, based on the model height and the incoming velocity, the flow produces features and aerodynamic forces relevant for the higher (interesting in engineering) Reynolds number. A detailed survey of both instantaneous and time-averaged flows is made and a comparison with previous knowledge on similar flows is presented. Besides the coherent structures observed in experimental and previous numerical studies, new smaller-scale structures were registered here. The mechanisms of formation of flow structures are explained and the difference between instantaneous and time-averaged flow features found in the experimental observations is confirmed. Aerodynamic forces are computed and their time history is used to reveal the characteristic frequencies of the flow motion around the body. A comparison is made of pressure and velocity results with experimental data and shows fairly good agreement.

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12

Takashi, Matsuno, Maeda Kengo, Fujita Noboru, Haruna Kenichi, Baba Teruaki, Yamada Gouji, and Kawazoe Hiromitsu. "1197 ON THE MECHANISM OF BLUFF BODY FLOW CONTROL BY PULSED PLASMA ACTUATOR." Proceedings of the International Conference on Jets, Wakes and Separated Flows (ICJWSF) 2013.4 (2013): _1197–1_—_1197–6_. http://dx.doi.org/10.1299/jsmeicjwsf.2013.4._1197-1_.

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13

Stern, F., Y. Toda, and H. T. Kim. "Computation of Viscous Flow Around Propeller-Body Configurations: Iowa Axisymmetric Body." Journal of Ship Research 35, no. 02 (June 1, 1991): 151–61. http://dx.doi.org/10.5957/jsr.1991.35.2.151.

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Анотація:

Further validation of a viscous-flow method for predicting propeller-hull interaction is provided through detailed comparisons with recent experimental data for the practical configuration of the Iowa axisymmetric body. Modifications are made to the k-ε turbulence model and wall functions for axisymmetric bodies. Close agreement is demonstrated between the calculations and the data, which supports the conclusion that the present procedures can accurately simulate the steady part of the combined propeller-hull flow field. However, the present extensive comparisons also point out the critical role of turbulence modeling and detailed numerical treatments. Also, comparisons are made with Huang's inviscid-flow method. Although both methods show similar trends, there are some important differences; for example, Huang's method predicts reduced propeller loading and larger axial velocities in the propeller plane near the body surface and propeller tip. Near the propeller tip, the present method exhibits a velocity defect region, which is absent in Huang's method. In consideration of the greater rigor of the present method, such differences imply that viscous effects play an important role in propeller-hull interaction even for the relatively simple case of an axisymmetric body and should be accounted for in the design procedures of wake-adapated propellers. However, part of the differences may be due to some of the present detailed numerical treatments, which indicate the need for continued refinement of comprehensive methods, such as the present one, and more detailed experimental information for validation purposes.

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14

Mioc, V., and M. Barbosu. "Collision dynamics in Hénon-Heiles’ two-body problem." Serbian Astronomical Journal, no. 167 (2003): 43–46. http://dx.doi.org/10.2298/saj0367043m.

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Анотація:

We tackle the two-body problem associated to H?non-Heiles? potential in the special case of the collision singularity. Using McGehee-type transformations of the second kind, we blow up the singularity and replace it by the collision manifold Mc pasted on the phase spece. We fully describe the flow on Mc. This flow is similar to analogous flows met in post-Newtonian two-body problems.

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15

Arai, Norio, Kota Fujimura, and Yoko Takakura. "Flowfield around a Body with Elastic Walls." Advanced Materials Research 33-37 (March 2008): 1083–88. http://dx.doi.org/10.4028/www.scientific.net/amr.33-37.1083.

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When a bluff body is located in a uniform flow, the flow is separated and vortices are formed. Consequently, the vortices cause “flow-induced vibrations”. Especially, if the Strouhal number and the frequency of the body oscillation coincide with the natural frequency, the lock-in regime will occur and we could find the large damages on it. Therefore, it is profitable, in engineering problems, to clarify this phenomenon and to suppress the vibration, in which the effect of elastic walls on the suppression is focused. Then, the aims of this article are to clarify the oscillatory characteristics of the elastic body and the flowfield around the body by numerical simulations, in which a square pillar with elastic walls is set in a uniform flow. Two dimensional incompressible flows are solved by the continuity equation, Navier-Stokes equation and the Poisson equation which are derived by taking divergence of Navier-Stokes equation. Results show that a small deformation of elastic walls has a large influence on the body motion. In particular, the effect is very distinct at the back.

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16

Kolmogorov, Dmitry K., Andreas Hüppe, Florian Menter, and Andrey V. Garbaruk. "Large Eddy Simulation with wall functions of Ahmed body." Journal of Physics: Conference Series 2103, no. 1 (November 1, 2021): 012213. http://dx.doi.org/10.1088/1742-6596/2103/1/012213.

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Abstract Large Eddy Simulation with Wall Function (WFLES) is known to be a cheap alternative to classical LES methods for simulation of flow where large and complex computational meshes are typically required. This makes it attractive for engineering applications. However experience of applying such methods to complex turbulent flows with flow separation and reattachment is still little-known in literature. In this work WFLES of flow around simplified car body with slant angle equal to 25 degrees and ReL = 2.8 · 106 is carried out on Octree mesh to demonstrate the capabilities and limitations of the method in such type of the flow. The results on a series of meshes show that even though the general flow topology is well captured, the critical part of the flow on the slant is hardly predicted even on 100 mln mesh. It is concluded that the prediction of separation above the slant requires significant mesh refinement even in the frame of WFLES.

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17

Haas, Brian L., and Michael A. Fallavollita. "Flow resolution and domain influence in rarefied hypersonic blunt-body flows." Journal of Thermophysics and Heat Transfer 8, no. 4 (October 1994): 751–57. http://dx.doi.org/10.2514/3.608.

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18

Sarath, K. P., and K. V. Manu. "An investigation of bluff body flow structures in variable velocity flows." Physics of Fluids 34, no. 3 (March 2022): 034102. http://dx.doi.org/10.1063/5.0083743.

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Анотація:

The present study explores three-dimensional vortex-dynamics past a wall-attached bluff body kept in a variable velocity field with numerical simulations. A trapezoidal pulse of mean velocity, consisting of acceleration phase from rest followed by constant velocity phase and deceleration phase to rest, is imposed at the inlet of the computational domain similar to the experimental study of Das et al. [“Unsteady separation and vortex shedding from a laminar separation bubble over a bluff body,” J. Fluids Struct. 40, 233–245 (2013)]. For a wide range of Reynolds numbers ([Formula: see text]), acceleration Reynolds numbers ([Formula: see text]), and deceleration Reynolds numbers ([Formula: see text]), different stages of flow evolution are systematically analyzed. The flow evolution starts with the formation of a primary vortex followed by a two-dimensional circular array of spanwise vortex tubes by inflectional shear-layer instability. At a sufficiently high Reynolds number, the shear layer vortices originated from two-dimensional fluctuations deformed by three-dimensional instabilities, giving fragmented streamwise vorticity. In addition, long-wavelength “tongue-like structures” and short-wavelength “rib-like structures” are evident near the top wall and the bluff body, respectively. The streamwise vorticity generation equation indicates that the spanwise vortex tubes initially tilt, resulting in streamwise vorticity, further amplified by the vortex stretching process. The distinct flow features, including mode shape, frequency, and growth rate associated with the shear-layer instability, are identified using the dynamic mode decomposition (DMD) algorithm. Using the maximum growth rate criteria, the DMD technique successfully separates the coherent shear layer modes associated with two-dimensional shear layer instability from the flow field.

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19

Cheng, Mei, and Zhi Min Zhang. "Metal Flow Behaviour in Tee Joint Valve Body Multidirectional Extrusion." Materials Science Forum 747-748 (February 2013): 431–36. http://dx.doi.org/10.4028/www.scientific.net/msf.747-748.431.

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By multi-axis active load deformation method, the equivalence diameter tee joint was formed on multi-axis numerical control hydraulic press machine. The loading route was determined by numerical simulation. The experiment results showed that two loading method can complete form the parts. The different directions metal flow was observed under multi-axis loading conditions. To simplify analysis, the flow field was divided into several regions. In every region, the metal flow direction was only one. In multi-axis loading, the way of deformation follows priority deformation principle: The metal flows only choose one direction even if the work piece were under the complicated coupling field condition. The mathematical model of the deformation force and metal flow rate was established. The theoretical calculation had been provided.

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20

Zhang, J. Z,, K. L. Li, and W. Kang. "Stability Analysis of Flow Pattern in Flow around Body by POD." Journal of Applied Nonlinear Dynamics 1, no. 4 (December 2012): 387–99. http://dx.doi.org/10.5890/jand.2012.09.001.

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21

Kocabiyik, S., and C. Bozkaya. "Free surface flow simulation with application to bluff body flow control." European Physical Journal Special Topics 224, no. 2 (March 2015): 341–54. http://dx.doi.org/10.1140/epjst/e2015-02364-4.

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22

Gai, S. L. "Some features of steady separated flow from low speed to hypersonic." Aeronautical Journal 112, no. 1128 (February 2008): 109–13. http://dx.doi.org/10.1017/s0001924000002049.

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Steady non-vortex shedding base flow behind a bluff body is considered. Such a flow is characterised by the flow separation at the trailing edge of the body with an emerging shear layer which reattaches on the axis with strong recompression and recirculating flow bounded by the base, the shear layer, and the axis. Steady wake flows behind a bluff body at low speeds have been studied for more than a century (for example, Kirchhoff; Riabouchinsky). Recently, research on steady bluff body wake flow at low speeds has been reviewed and reinterpreted by Roshko. Roshko has also commented on some basic aspects of steady supersonic base flow following on from Chapman and Korst analyses. In the present paper, we examine the steady base flow features both at low speeds and supersonic speeds in the light of Roshko’s model and expand on some further aspects of base flows at supersonic and hypersonic speeds, not covered by Roshko.

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23

IINUMA, Takeshi. "Visualization of flow in the human body." JOURNAL OF THE FLOW VISUALIZATION SOCIETY OF JAPAN 5, no. 17 (1985): 75–81. http://dx.doi.org/10.3154/jvs1981.5.75.

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24

Shang, J. S., J. Hayes, J. Menart, and J. Miller. "Blunt Body in Hypersonic Electromagnetic Flow Field." Journal of Aircraft 40, no. 2 (March 2003): 314–22. http://dx.doi.org/10.2514/2.3095.

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25

Shulak, J. M., P. B. O'Donovan, D. M. Paushter, and C. F. Lanzieri. "Color flow Doppler of carotid body paraganglioma." Journal of Ultrasound in Medicine 8, no. 9 (September 1989): 519–21. http://dx.doi.org/10.7863/jum.1989.8.9.519.

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26

Wessam, Mahfouz Elnaggar, Zhihua Chen, and Zhengui Huang. "Flow Field Investigation around Body Tail Projectile." Journal of Applied Mathematics and Physics 02, no. 06 (2014): 277–83. http://dx.doi.org/10.4236/jamp.2014.26033.

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27

Sher Afghan Khan et al.,, Sher Afghan Khan et al ,. "Flow Control with Aerospike behind Bluff Body." International Journal of Mechanical and Production Engineering Research and Development 8, no. 3 (2018): 1001–8. http://dx.doi.org/10.24247/ijmperdjun2018106.

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28

Smith, Frank T., and Phillip L. Wilson. "Body-rock or lift-off in flow." Journal of Fluid Mechanics 735 (October 22, 2013): 91–119. http://dx.doi.org/10.1017/jfm.2013.464.

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AbstractConditions are investigated under which a body lying at rest or rocking on a solid horizontal surface can be removed from the surface by hydrodynamic forces or instead continues rocking. The investigation is motivated by recent observations on Martian dust movement as well as other small- and large-scale applications. The nonlinear theory of fluid–body interaction here has unsteady motion of an inviscid fluid interacting with a moving thin body. Various shapes of body are addressed together with a range of initial conditions. The relevant parameter space is found to be subtle as evolution and shape play substantial roles coupled with scaled mass and gravity effects. Lift-off of the body from the surface generally cannot occur without fluid flow but it can occur either immediately or within a finite time once the fluid flow starts up: parameters for this are found and comparisons are made with Martian observations.

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29

UCHIYAMA, Tomomi. "Flow around Bluff Body within Bubble Plume." Proceedings of Mechanical Engineering Congress, Japan 2019 (2019): W05102. http://dx.doi.org/10.1299/jsmemecj.2019.w05102.

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30

UCHIYAMA, Tomomi. "Flow around Bluff Body within Bubble Plume." Proceedings of Mechanical Engineering Congress, Japan 2019 (2019): W15102. http://dx.doi.org/10.1299/jsmemecj.2019.w15102.

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31

Elshehawey, E. F., E. M. E. Elbarbary, N. A. S. Afifi, and M. El-Shahed. "Mhd flow of Blood Under Body Acceleration." Integral Transforms and Special Functions 12, no. 1 (August 2001): 1–6. http://dx.doi.org/10.1080/10652460108819329.

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32

OKAJIMA, Atsushi. "Flow-Induced Vibration of a Bluff Body." Transactions of the Japan Society of Mechanical Engineers Series B 65, no. 635 (1999): 2190–95. http://dx.doi.org/10.1299/kikaib.65.2190.

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33

OKAJIMA, Atsushi. "Flow-Induced Vibration of a Bluff Body." Reference Collection of Annual Meeting VII.01.1 (2001): 7–8. http://dx.doi.org/10.1299/jsmemecjsm.vii.01.1.0_7.

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34

KANAYAMA, Hiroshi, Daisuke TAGAMI, Takahiro ARAKI, and Satoshi OKADA. "Air flow analysis around a moving body." Proceedings of Conference of Kyushu Branch 2003.56 (2003): 269–70. http://dx.doi.org/10.1299/jsmekyushu.2003.56.269.

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35

Kotel’nikov, M. V. "Cylindrical body in a collisionless plasma flow." Technical Physics 54, no. 3 (March 2009): 428–30. http://dx.doi.org/10.1134/s1063784209030177.

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36

Choi, Haecheon, Woo-Pyung Jeon, and Jinsung Kim. "Control of Flow Over a Bluff Body." Annual Review of Fluid Mechanics 40, no. 1 (January 2008): 113–39. http://dx.doi.org/10.1146/annurev.fluid.39.050905.110149.

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37

McEachern, James F., and Gerald C. Lauchle. "Flow‐induced noise on a bluff body." Journal of the Acoustical Society of America 97, no. 2 (February 1995): 947–53. http://dx.doi.org/10.1121/1.412073.

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38

KANAYAMA, Hiroshi. "Air flow analysis around a moving body." Proceedings of The Computational Mechanics Conference 2003.16 (2003): 113–14. http://dx.doi.org/10.1299/jsmecmd.2003.16.113.

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39

TANIDA, Yoshimichi. "Visualization of Flow in a Living Body." Journal of the Visualization Society of Japan 12, no. 45 (1992): 79–83. http://dx.doi.org/10.3154/jvs.12.79.

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40

Crane, L. J., and A. G. McVeigh. "Steady flow along a Rankine half-body." ZAMM - Journal of Applied Mathematics and Mechanics / Zeitschrift für Angewandte Mathematik und Mechanik 91, no. 8 (February 23, 2011): 681–86. http://dx.doi.org/10.1002/zamm.201000197.

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41

Chadwick, Edmund. "A slender–body theory in Oseen flow." Proceedings of the Royal Society of London. Series A: Mathematical, Physical and Engineering Sciences 458, no. 2024 (August 8, 2002): 2007–16. http://dx.doi.org/10.1098/rspa.2002.0996.

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42

Santhosh, Sanju. "Flexible Body with Flow Independent of Velocity." International Journal of Mechanical Engineering 4, no. 10 (October 25, 2017): 15–17. http://dx.doi.org/10.14445/23488360/ijme-v4i10p103.

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43

Golovachev, Yu P., V. B. Zemlyakov, and E. V. Matvienko. "Supersonic swirling flow past a blunt body." Fluid Dynamics 29, no. 6 (November 1994): 869–71. http://dx.doi.org/10.1007/bf02040797.

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44

Crane, L. J., and A. G. McVeigh. "Slip flow on a body of revolution." Acta Mechanica 224, no. 3 (November 30, 2012): 619–29. http://dx.doi.org/10.1007/s00707-012-0786-x.

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45

Ling, Guocan. "Numerical study of bluff body flow structures." Sadhana 18, no. 3-4 (August 1993): 683–94. http://dx.doi.org/10.1007/bf02744372.

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46

Ota, Terukazu, Akira Ashidate, Fumiyasu Ono, Satoshi Goto, and Hidemi Toh. "Flow around A V-shaped bluff body." Experimental Thermal and Fluid Science 7, no. 2 (August 1993): 148. http://dx.doi.org/10.1016/0894-1777(93)90197-q.

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47

Wolfgang, M. J., J. M. Anderson, M. A. Grosenbaugh, D. K. Yue, and M. S. Triantafyllou. "Near-body flow dynamics in swimming fish." Journal of Experimental Biology 202, no. 17 (September 1, 1999): 2303–27. http://dx.doi.org/10.1242/jeb.202.17.2303.

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We consider the motions and associated flow patterns of a swimming giant danio (Danio malabaricus). Experimental flow-visualization techniques have been employed to obtain the unsteady two-dimensional velocity fields around the straight-line swimming motions and a 60 degrees turn of the fish in the centerline plane of the fish depth. A three-dimensional numerical method is also employed to predict the total velocity field through simulation. Comparison of the experimental and numerical velocity and vorticity fields shows good agreement. The fish morphology, with its narrow peduncle region, allows for smooth flow into the articulated tail, which is able to sustain a large load for thrust generation. Streamlines of the flow detail complex processes that enhance the efficiency of flow actuation by the tail. The fish benefits from smooth near-body flow patterns and the generation of controlled body-bound vorticity, which is propagated towards the tail, shed prior to the peduncle region and then manipulated by the caudal fin to form large-scale vortical structures with minimum wasted energy. This manipulation of body-generated vorticity and its interaction with the vorticity generated by the oscillating caudal fin are fundamental to the propulsion and maneuvering capabilities of fish.

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Dai, Jihuang, Yuchao Dai, and Bin Fan. "Self-supervised multi-body scene flow estimation." Neurocomputing 463 (November 2021): 472–82. http://dx.doi.org/10.1016/j.neucom.2021.08.008.

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49

Berman, A. "Forced heat loss from body surface reduces heat flow to body surface." Journal of Dairy Science 93, no. 1 (January 2010): 242–48. http://dx.doi.org/10.3168/jds.2009-2601.

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50

Volianitis, Stefanos, and Niels H. Secher. "Cardiovascular control during whole body exercise." Journal of Applied Physiology 121, no. 2 (August 1, 2016): 376–90. http://dx.doi.org/10.1152/japplphysiol.00674.2015.

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It has been considered whether during whole body exercise the increase in cardiac output is large enough to support skeletal muscle blood flow. This review addresses four lines of evidence for a flow limitation to skeletal muscles during whole body exercise. First, even though during exercise the blood flow achieved by the arms is lower than that achieved by the legs (∼160 vs. ∼385 ml·min−1·100 g−1), the muscle mass that can be perfused with such flow is limited by the capacity to increase cardiac output (42 l/min, highest recorded value). Secondly, activation of the exercise pressor reflex during fatiguing work with one muscle group limits flow to other muscle groups. Another line of evidence comes from evaluation of regional blood flow during exercise where there is a discrepancy between flow to a muscle group when it is working exclusively and when it works together with other muscles. Finally, regulation of peripheral resistance by sympathetic vasoconstriction in active muscles by the arterial baroreflex is critical for blood pressure regulation during exercise. Together, these findings indicate that during whole body exercise muscle blood flow is subordinate to the control of blood pressure.

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