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Artigos de revistas sobre o tema "FST-Induced transition"

Autor: Grafiati
Publicado: 7 de setembro de 2024

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1

Nakagawa, Kosuke, Takahiro Tsukahara, and Takahiro Ishida. "DNS Study on Turbulent Transition Induced by an Interaction between Freestream Turbulence and Cylindrical Roughness in Swept Flat-Plate Boundary Layer." Aerospace 10, no. 2 (2023): 128. http://dx.doi.org/10.3390/aerospace10020128.

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Laminar-to-turbulent transition in a swept flat-plate boundary layer is caused by the breakdown of the crossflow vortex via high-frequency secondary instability and is promoted by the wall-surface roughness and the freestream turbulence (FST). Although the FST is characterized by its intensity and wavelength, it is not clear how the wavelength affects turbulent transitions and interacts with the roughness-induced transition. The wavelength of the FST depends on the wind tunnel or in-flight conditions, and its arbitrary control is practically difficult in experiments. By means of direct numeric
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2

He, S., and M. Seddighi. "Turbulence in transient channel flow." Journal of Fluid Mechanics 715 (January 9, 2013): 60–102. http://dx.doi.org/10.1017/jfm.2012.498.

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AbstractDirect numerical simulations (DNS) are performed of a transient channel flow following a rapid increase of flow rate from an initially turbulent flow. It is shown that a low-Reynolds-number turbulent flow can undergo a process of transition that resembles the laminar–turbulent transition. In response to the rapid increase of flow rate, the flow does not progressively evolve from the initial turbulent structure to a new one, but undergoes a process involving three distinct phases (pre-transition, transition and fully turbulent) that are equivalent to the three regions of the boundary la
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3

Phani Kumar, P., A. C. Mandal, and J. Dey. "Effect of a mesh on boundary layer transitions induced by free-stream turbulence and an isolated roughness element." Journal of Fluid Mechanics 772 (May 7, 2015): 445–77. http://dx.doi.org/10.1017/jfm.2015.203.

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Streamwise streaks, their lift-up and streak instability are integral to the bypass transition process. An experimental study has been carried out to find the effect of a mesh placed normal to the flow and at different wall-normal locations in the late stages of two transitional flows induced by free-stream turbulence (FST) and an isolated roughness element. The mesh causes an approximately 30 % reduction in the free-stream velocity, and mild acceleration, irrespective of its wall-normal location. Interestingly, when located near the wall, the mesh suppresses several transitional events leadin
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4

Han, Sang-Kap, Min-Kyung Joo, Jeon-Kyung Kim, Woonhee Jeung, Heerim Kang, and Dong-Hyun Kim. "Bifidobacteria-Fermented Red Ginseng and Its Constituents Ginsenoside Rd and Protopanaxatriol Alleviate Anxiety/Depression in Mice by the Amelioration of Gut Dysbiosis." Nutrients 12, no. 4 (2020): 901. http://dx.doi.org/10.3390/nu12040901.

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Gut dysbiosis is closely connected with the outbreak of psychiatric disorders with colitis. Bifidobacteria-fermented red ginseng (fRG) increases the absorption of ginsenoside Rd and protopanxatriol into the blood in volunteers and mice. fRG and Rd alleviates 2,4,6-trinitrobenzenesulfonic acid-induced colitis in mice. Therefore, to understand the gut microbiota-mediated mechanism of fRG against anxiety/depression, we examined the effects of red ginseng (RG), fRG, ginsenoside Rd, and protopanaxatriol on the occurrence of anxiety/depression, colitis, and gut dysbiosis in mice. Mice with anxiety/d
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5

Stevenson, J. P. J., K. P. Nolan, and E. J. Walsh. "Particle image velocimetry measurements of induced separation at the leading edge of a plate." Journal of Fluid Mechanics 804 (September 9, 2016): 278–97. http://dx.doi.org/10.1017/jfm.2016.532.

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The free shear layer that separates from the leading edge of a round-nosed plate has been studied under conditions of low (background) and elevated (grid-generated) free stream turbulence (FST) using high-fidelity particle image velocimetry. Transition occurs after separation in each case, followed by reattachment to the flat surface of the plate downstream. A bubble of reverse flow is thereby formed. First, we find that, under elevated (7 %) FST, the time-mean bubble is almost threefold shorter due to an accelerated transition of the shear layer. Quadrant analysis of the Reynolds stresses rev
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6

Vaid, Aditya, Nagabhushana Rao Vadlamani, Ananth Sivaramakrishnan Malathi, and Vikrant Gupta. "Dynamics of Bypass Transition Behind Roughness Element Subjected to Pulses of Free-Stream Turbulence." Physics of Fluids, October 10, 2022. http://dx.doi.org/10.1063/5.0120241.

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This study explores the dynamics of bypass transition of a zero pressure gradient boundary layer transitioning under the combined influence of an isolated roughness element with pulses of free-stream turbulence (FST). We consider a hemispherical roughness element placed over a flat plate, while the pulses of FST are introduced at the inlet which is in contrast to continuous FST largely explored in the literature. For a fixed turbulence intensity and length scale, a series of eddy-resolving simulations are carried out to examine the effect of varying the pulsing frequency of FST. The flow behin
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7

Sengupta, Aditi, Nivedita Gupta, and Bryn Noel Ubald. "Separation-induced transition on a T106A blade under low and elevated free stream turbulence." Physics of Fluids 36, no. 2 (2024). http://dx.doi.org/10.1063/5.0189358.

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The separation-induced transition on the suction surface of a T106A low pressure turbine blade is a complex phenomenon with implications for aerodynamic performance. In this numerical investigation, we explore an adverse pressure gradient-dominated flow subjected to varying levels of free stream excitation, as the underlying separation-induced transition is a critical factor in assessing blade profile loss. By comprehensively analyzing the effects of free stream turbulence (FST) on the transition process, we delve into the various mechanisms which govern the instabilities underlying bypass tra
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8

Mamidala, Santhosh B., André Weingärtner, and Jens H. M. Fransson. "A comparative study of experiments with numerical simulations of free-stream turbulence transition." Journal of Fluid Mechanics 951 (November 14, 2022). http://dx.doi.org/10.1017/jfm.2022.883.

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To date, very few careful and direct comparisons between experiments and direct numerical simulations (DNS) have been published on free-stream turbulence (FST) induced boundary layer transition, whilst there exist numerous published works on the comparison of canonical turbulent boundary layers. The primary reason is that the former comparison is vastly more difficult to carry out simply because all known transition scenarios have large energy gradients and are extremely sensitive to surrounding conditions. This paper presents a detailed comparison between new experiments and available DNS dat
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9

Đurović, Kristina, Ardeshir Hanifi, Philipp Schlatter, Kenzo Sasaki, and Dan S. Henningson. "Direct numerical simulation of transition under free-stream turbulence and the influence of large integral length scales." Physics of Fluids 36, no. 7 (2024). http://dx.doi.org/10.1063/5.0207016.

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Under the action of free-stream turbulence (FST), elongated streamwise streaky structures are generated inside the boundary layer, and their amplitude and wavelength are crucial for the transition onset. While turbulence intensity is strongly correlated with the transitional Reynolds number, characteristic length scales of the FST are often considered to have a slight impact on the transition location. However, a recent experiment by Fransson and Shahinfar [J. Fluid Mech. 899, A23 (2020)] shows significant effects of FST scales. They found that, for higher free-stream turbulence levels and lar
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10

Wang, Taiyang, Yaomin Zhao, John Leggett, and Richard Sandberg. "Direct Numerical Simulation of a High-Pressure Turbine Stage: Unsteady Boundary Layer Transition and the Resulting Flow Structures." Journal of Turbomachinery, September 27, 2023, 1–28. http://dx.doi.org/10.1115/1.4063510.

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Abstract In the present study, we investigate the unsteady boundary layer transition based on the direct numerical simulation database of a high-pressure turbine (HPT) stage (Zhao and Sandberg, GT2021-58995), focusing on the transition mechanisms on the rotor blade, affected by the incoming periodic wakes and the background free-stream turbulence (FST). Based on the fully-resolved flow fields, we provide detailed analysis of the flow structures responsible for the transition, and two distinctive transition paths have been identified. The first path is the typical bypass transition via the inst
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11

Mohamed Aniffa, S., V. S. Caesar, V. Dabaria, and A. C. Mandal. "Characteristics of geometry-and pressure-induced laminar separation bubbles at an enhanced level of free-stream turbulence." Journal of Fluid Mechanics 957 (February 20, 2023). http://dx.doi.org/10.1017/jfm.2023.53.

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Responses of a geometry-induced separation bubble (GISB) and a pressure-induced separation bubble (PISB) at enhanced levels of free-stream turbulence (FST) have experimentally been investigated for a comparative study using the particle image velocimetry (PIV) technique. The outlines of separation bubbles based on the dividing streamlines are self-similar for different levels of FST and Reynolds numbers. The spectral analyses of the time-resolved PIV data show that the vortex shedding frequency of a separated shear layer remains unchanged for the GISB cases even with an enhanced level of FST.
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12

Katiyar, S., and S. Sarkar. "Influence of freestream turbulence on boundary layer transition over a controlled-diffusion compressor blade." Physics of Fluids 36, no. 6 (2024). http://dx.doi.org/10.1063/5.0213250.

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The influence of inlet freestream turbulence (FST) on the boundary layer transition over the suction surface of a controlled-diffusion compressor blade is demonstrated here by employing a well-resolved large-eddy simulation. Inherent to low Reynolds number conditions, a laminar separation bubble (LSB) forms on the suction surface, attributing to substantial flow diffusion. Inlet FST levels ranging from 1.5% to 7.6% are systematically varied, while maintaining a constant Reynolds number based on axial chord and inlet velocity at 2.1 × 105. Transition of the shear layer is initiated via Kelvin–H
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13

Mamidala, Santhosh B., A. Weingärtner, and J. H. M. Fransson. "Leading-edge pressure gradient effect on boundary layer receptivity to free-stream turbulence." Journal of Fluid Mechanics 935 (February 3, 2022). http://dx.doi.org/10.1017/jfm.2022.19.

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Free-stream turbulence (FST) induced boundary layer transition is an intricate physical process that starts already at the leading edge (LE) with the LE receptivity process dictating how the broad spectrum of FST scales is received by the boundary layer. The importance of the FST integral length scale, apart from the turbulence intensity, has recently been recognized in transition prediction but a systematic variational study of the LE pressure gradient has still not been undertaken. Here, the LE pressure gradient is systematically varied in order to quantify its effect on the transition locat
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14

Feng, Long, Yimiao Hou, Qingqing Hao, et al. "A multi-function textile with pH-induced switch wettability transition for controllable oil−water separation." Textile Research Journal, November 14, 2021, 004051752110569. http://dx.doi.org/10.1177/00405175211056981.

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The deterioration of water ecology caused by the discharge of oil spill wastewater, industrial sewage, and municipal sewage has attracted wide attention worldwide. Thus, it is significant to design a simple, environmentally friendly approach to separate oil–water mixtures. In this work, three different fabrics with pH-induced wettability transition were prepared by a dip-coating process for oil and water separation. The dip-coating fabrics had the advantages of oil–water separation, photocatalytic degradation, and recycling. Polyethylene terephthalate/polyamide nonwoven fabric was used as the
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15

Mi, Shu, Ye Gao, Ze Jiang, et al. "Electric‐Field‐Induced in‐Plane Anisotropy of Superconducting Transition Temperature for FeSe0.5Te0.5 Thin Films." Advanced Functional Materials, March 25, 2024. http://dx.doi.org/10.1002/adfm.202404450.

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AbstractSuperconductor/ferroelectric heterostructures are very important for fundamental research and applications since superconductivity can be controlled by electric fields via ferroelectric polarization/piezostrain. Superconductivity is a macroscopic quantum phenomenon and it is commonly believed that the in‐plane superconducting transition temperature (Tc) should be isotropic for superconductors with crystal structures of stacking layers (quasi 2D). Here, the observation of piezostrain‐induced in‐plane anisotropy of Tc in FeSe0.5Te0.5 (FST) thin films grown on ferroelectric single crystal
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16

Scillitoe, Ashley D., Paul G. Tucker, and Paolo Adami. "Numerical Investigation of Three-Dimensional Separation in an Axial Flow Compressor: The Influence of Freestream Turbulence Intensity and Endwall Boundary Layer State." Journal of Turbomachinery 139, no. 2 (2016). http://dx.doi.org/10.1115/1.4034797.

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Regions of three-dimensional separations are an inherent flow feature of the suction surface-endwall corner in axial compressors. These corner separations can cause a significant total pressure loss and reduce the compressor's efficiency. This paper uses wall-resolved LES to investigate the loss sources in a corner separation, and examines the influence of the inflow turbulence on these sources. Different subgrid scale (SGS) models are tested and the choice of model is found to be important. The σ SGS model, which performed well, is then used to perform LES of a compressor endwall flow. The ti
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17

Cao, Li-Hua, Yuan-Yuan Zhao, Ming Bai та ін. "Mechanistic Studies of Gypenosides in Microglial State Transition and its Implications in Depression-Like Behaviors: Role of TLR4/MyD88/NF-κB Signaling". Frontiers in Pharmacology 13 (15 березня 2022). http://dx.doi.org/10.3389/fphar.2022.838261.

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Depression is a prevalent psychiatric disorder. Microglial state transition has been found in many neurological disorders including depression. Gypenosides (Gypenosides I-LXXVIII, Gps) are saponin extracts isolated from the traditional Chinese herb Gynostemma pentaphyllum (Thunb.) Makino that exert anti-inflammatory and neuroprotective activities and regulate depression-like behaviors. However, its effect on microglial state transition in depression remains unknown. We aimed to evaluate the potential relationship between Gps and TLR4/MyD88/NF-κB signaling in microglial state transition in vitr
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18

Palumbo, Andrea, Onofrio Semeraro, Jean-Christophe Robinet, and Luigi de Luca. "Boundary layer transition induced by low-speed synthetic jets." Physics of Fluids, December 5, 2022. http://dx.doi.org/10.1063/5.0128798.

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The effect of low-speed, circular synthetic jets (SJ) on the turbulent transition of a laminar boundary layer (BL) is studied through Direct Numerical Simulations (DNS). The SJ capability in fixating the streamwise location of transition onset is analyzed in terms of its operation parameters (reduced frequency $F^+$ and momentum coefficient $C_\mu$). The effect of free-stream turbulence (FST) on the near-wall vortical structures generated by the synthetic jet is analyzed as well, to mimic the actual operation of the control system. Velocity spectra, phase portraits and dynamic mode decompositi
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