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Time-resolved visualization of an impinging jet subjected to bi-modal forcing 受双峰强迫的冲击射流的时间分辨可视化
IF 1.7 4区 计算机科学 Q3 COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS Pub Date : 2023-11-20 DOI: 10.1007/s12650-023-00950-2
Basil Abdelmegied, Ahmed Naguib

High-speed flow visualization is utilized to study the effect of bi-modal forcing on an axisymmetric impinging jet at Reynolds number, based on the jet exit velocity and diameter, of ({mathrm{Re}}_{D}=4233). The forcing involves excitation using two frequencies simultaneously: the fundamental and subharmonic frequencies of the initial instability of the jet shear layer. The focus of the study is on the effect of the intermodal phase (phi) while utilizing the same modal amplitude ratio and forcing level. The natural jet and the jet forced using pure harmonic forcing at the fundamental and the subharmonic frequency are also studied as benchmark cases for bi-modal forcing. Results show that all modes of forcing accelerate the development of the jet vortex structure by producing two vortex pairings ahead of the impingement plate. This double-paired structure is rarely seen in the natural jet and is promoted the most under pure subharmonic forcing and bi-modal forcing. The intermodal phase is found to have a strong effect with the double-paired structure exhibiting symmetry and high cycle-to-cycle repeatability at (phi approx 150^circ -165^circ), or significant asymmetry and disorganization at (phi approx 90^circ -105^circ). The main distinction between bi-modal forcing at (phi approx 150^circ -165^circ) and pure subharmonic forcing is that the double-paired vortex structure is more persistent and has better repeatability in the former case. With subharmonic forcing alone, the vortex structure exhibits some random switching between the symmetric double-paired structure and the asymmetric structure. Overall, the promotion of double pairing leads to faster narrowing of the jet core and stronger vortex–wall interaction.

Graphical Abstract

基于({mathrm{Re}}_{D}=4233)射流出口速度和直径,利用高速流动可视化技术研究了双峰强迫对雷诺数下轴对称冲击射流的影响。强迫包括同时使用两个频率的激励:射流剪切层初始不稳定的基频和次谐波频率。研究的重点是在使用相同的模态振幅比和强迫水平时,多式相(phi)的影响。本文还研究了自然射流和纯谐波强迫在基频和次谐波频率下强迫射流作为双峰强迫的基准情况。结果表明:各作用力模式均通过在撞击板前方产生两对涡对来加速射流涡结构的发展;这种双对结构在自然射流中很少出现,在纯次谐波强迫和双峰强迫下促进最多。发现多模态相对双对结构有很强的影响,在(phi approx 150^circ -165^circ)处表现出对称性和高循环到循环的可重复性,或在(phi approx 90^circ -105^circ)处表现出明显的不对称性和无序性。(phi approx 150^circ -165^circ)双模态强迫与纯次谐波强迫的主要区别在于,前者双对涡结构更持久,具有更好的可重复性。在单次谐波作用下,涡旋结构在对称双对结构和非对称双对结构之间表现出一定的随机切换。总的来说,双对的促进导致射流核心变窄更快,涡壁相互作用更强。图形摘要
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引用次数: 0
Visualization study on boundary layer transition using surface arc plasma actuators 表面电弧等离子体致动器边界层跃迁的可视化研究
IF 1.7 4区 计算机科学 Q3 COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS Pub Date : 2023-11-17 DOI: 10.1007/s12650-023-00951-1
Tian Gan

An experiment is conducted to investigate the effect of surface arc plasma actuators (SAPAs) on the transition of a laminar boundary layer on a flat plate in Ma = 3 flow. Schlieren snapshots and the root mean square (RMS) of the image intensity and pressure measurements are analyzed to determine the SAPAs’ control performance. Four SAPAs in an array are placed in a spanwise direction to generate perturbations within the laminar boundary layer. The results indicate that a change from laminar to turbulent flow is achieved using SAPAs with a high repetition rate. The SAPAs introduce many thermal disturbance into the boundary layer which involves a lot turbulent structures. As a turbulent flow is formed downstream of the actuators, the RMS of the schlieren intensity (Irms) and the pressure fluctuations (Prms) increase. According to the RMS pressure measurements, the actuators with an actuation frequency of 10 kHz result in a 25% increase in the distance where the transition occurs. The formation of thermal gas bubbles causes trailing vortices associated with a strong shear effect downstream of the actuators. These streamwise vortices interact with the laminar boundary layer first, suggesting significant vortical activity in the boundary layer, whose thickness increases because the width of the Irms is increasing in spanwise direction. Amplification and breakdown of these disturbances eventually lead to the laminar-turbulent transition of the boundary layer. In addition, two higher actuation frequency modes are compared to determine the frequency effect on the laminar-turbulent transition. The Irms results indicate that the transition location moves upstream as the actuation frequency increases.

Graphical abstract

实验研究了表面电弧等离子体致动器(SAPAs)在Ma = 3流动中对平板层流边界层转捩的影响。分析了纹影快照和图像强度和压力测量的均方根(RMS),以确定SAPAs的控制性能。阵列中的四个sapa沿展向放置以在层流边界层内产生扰动。结果表明,使用高重复率的SAPAs可以实现从层流到湍流的转变。在边界层中引入了大量的热扰动,这些扰动涉及到大量的湍流结构。当执行器下游形成湍流时,纹影强度(Irms)的均方根值和压力波动(Prms)增大。根据RMS压力测量,驱动频率为10 kHz的致动器导致发生转换的距离增加25%。热气泡的形成引起了尾部涡,并与执行器下游的强剪切效应有关。这些流向涡旋首先与层流边界层相互作用,表明边界层中存在显著的涡旋活动,边界层的厚度随着涡旋宽度在展向上的增加而增加。这些扰动的放大和破坏最终导致边界层的层流-湍流过渡。此外,还比较了两种较高的驱动频率模式,以确定频率对层流-湍流过渡的影响。Irms结果表明,随着驱动频率的增加,过渡位置向上游移动。图形抽象
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引用次数: 0
The effect of curvature distortion on internal flow measurement of a levitated droplet using PIV 曲率畸变对PIV测量悬浮液滴内部流量的影响
4区 计算机科学 Q3 COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS Pub Date : 2023-11-04 DOI: 10.1007/s12650-023-00949-9
Eugene Gatete, Akiko Kaneko, Biao Shen
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引用次数: 0
Visualization of pressure fluctuation characteristics of weapon bay on unmanned aerial vehicle using delayed detached eddy simulation 基于延迟分离涡模拟的无人机武器舱压力波动特性可视化
4区 计算机科学 Q3 COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS Pub Date : 2023-10-28 DOI: 10.1007/s12650-023-00947-x
Yu Liu, Binqi Chen, Yong Shi, A. Rong
Abstract In the present study CFD simulation with delayed detached eddy simulation (DDES) are performed to investigate pressure fluctuation environment on an open cavity and weapon bay of UAV. The main purpose of this study is to explore the aerodynamic noise level of complex cavities with slant ceiling and irregular length–depth ratio. First, two cases on an open cavity at Ma 0.85 are analyzed to determine the slant ceiling influence, which shows that the sound pressure levels increase by 1 dB due to the transverse flow effect. Then, a typical weapon bay on unmanned aerial vehicle is simulated to investigate the aerodynamic noise environment. The overall sound pressure level in the weapon bay is up to 157 dB, and when the Mach number turns from 0.6 to 0.8, the amplitude of all modes increases about 16–23 dB. The main focuses of this investigation are to discuss the mechanism of noise generation in a slant ceiling cavity and determine the pressure fluctuation characteristic of a typical weapon bay on unmanned aerial vehicle. Graphical abstract
摘要采用延迟分离涡模拟(DDES)对无人机空腔和武器舱的压力波动环境进行CFD仿真研究。本研究的主要目的是探讨具有倾斜顶板和不规则长深比的复杂腔体的气动噪声水平。首先,对两种情况下马氏0.85的开腔进行了分析,确定了斜顶的影响,结果表明横向流动效应使声压级提高了1 dB。然后,对某典型无人机武器舱进行仿真,研究其气动噪声环境。武器舱内总声压级高达157 dB,当马赫数从0.6变为0.8时,各模态振幅增加约16-23 dB。本文的研究重点是探讨斜顶棚腔内噪声的产生机理,确定典型无人机武器舱的压力波动特性。图形抽象
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引用次数: 0
MFA-DVR: direct volume rendering of MFA models MFA- dvr: MFA模型的直接体绘制
4区 计算机科学 Q3 COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS Pub Date : 2023-10-10 DOI: 10.1007/s12650-023-00946-y
Jianxin Sun, David Lenz, Hongfeng Yu, Tom Peterka
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引用次数: 0
Research on the control of supersonic jet under different boundary conditions 不同边界条件下超音速射流的控制研究
4区 计算机科学 Q3 COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS Pub Date : 2023-10-07 DOI: 10.1007/s12650-023-00948-w
Yuhang Zhou, Yunsong Gu, Longsheng Xue, Yun Jiao, Nanxing Shi, Shuai Deng
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引用次数: 0
Visual analysis of interface deformation in multiphase flow 多相流界面变形的可视化分析
4区 计算机科学 Q3 COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS Pub Date : 2023-09-29 DOI: 10.1007/s12650-023-00939-x
Alexander Straub, Grzegorz K. Karch, Jonas Steigerwald, Filip Sadlo, Bernhard Weigand, Thomas Ertl
Abstract In multiphase flows, the evolution of fluid-fluid interfaces is of interest in many applications. In addition to fluid dynamic forces governing the flow in the entire volume, surface tension determines droplet interfaces. Here, the analysis of interface kinematics can help in the investigation of interface deformation and the identification of potential breakups. To this end, we developed a visualization technique using metric and shape tensors to analyze interface stretching and bending. For interface stretching, we employ the eigenpairs of the metric tensor defined for the deformation rate of the fluid surface. For interface bending, we present a technique that locally captures the interface curvature change in terms of a shape tensor, extracting its principal directions and curvatures. We then visualize interface deformation by combining both representations into a novel glyph design. We apply our method to study multiphase flow simulations with particular emphasis on interface effects. These include the interplay between fluid dynamics and surface tension forces leading to breakup processes following droplet collisions, as well as droplet-droplet interactions of different fluids where Marangoni convection along the surface is explicitly taken into account. Graphical abstract
在多相流中,流体-流体界面的演变在许多应用中都引起了人们的兴趣。除了流体动力控制整个体积内的流动外,表面张力决定了液滴的界面。在这里,界面运动学分析有助于研究界面变形和识别潜在的破裂。为此,我们开发了一种使用度量和形状张量来分析界面拉伸和弯曲的可视化技术。对于界面拉伸,我们采用为流体表面变形率定义的度量张量的特征对。对于界面弯曲,我们提出了一种用形状张量局部捕获界面曲率变化的技术,提取其主方向和曲率。然后,我们通过将两种表示组合成一种新的字形设计来可视化界面变形。我们将该方法应用于研究多相流的模拟,特别强调了界面效应。这些包括流体动力学和表面张力之间的相互作用,导致液滴碰撞后的破裂过程,以及不同流体的液滴-液滴相互作用,其中明确考虑了沿表面的马兰戈尼对流。图形抽象
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引用次数: 0
LitVis: a visual analytics approach for managing and exploring literature 管理和探索文学的可视化分析方法
4区 计算机科学 Q3 COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS Pub Date : 2023-09-28 DOI: 10.1007/s12650-023-00941-3
Min Tian, Guozheng Li, Xiaoru Yuan
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引用次数: 0
Interactive steering on in situ particle-based volume rendering framework 交互式转向在原位粒子为基础的体绘制框架
4区 计算机科学 Q3 COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS Pub Date : 2023-09-15 DOI: 10.1007/s12650-023-00945-z
Takuma Kawamura, Yuta Hasegawa, Yasuhiro Idomura
Abstract The development of supercomputers and multi-scale computational fluid dynamics (CFD) models based on adaptive mesh refinement (AMR) enabled fast, large-scale, and high fidelity CFD simulations. Interactive in situ steering is an effective tool for debugging, searching for optimal solutions, and analyzing inverse problems in such CFD simulations. We propose an interactive in situ steering framework for large-scale CFD simulations on GPU supercomputers. This framework employs in situ particle-based volume rendering (PBVR), in situ data sampling, and a file-based control that enables interactive and asynchronous communication of steering parameters, compressed visualization particle data, and sampled monitoring data between supercomputers and user PCs. The parallelized PBVR is processed on the host CPU to avoid interference with CFD simulations on the GPU. We apply the proposed framework to a real-time plume dispersion analysis code CityLBM, which computes the lattice Boltzmann method on the block AMR grid using GPU supercomputers. In the numerical experiment, we address an inverse problem to find a pollutant source from the observation data at monitoring points and demonstrate the effectiveness of the human-in-the-loop approach via the in situ steering framework. Graphical abstract
超级计算机和基于自适应网格细化(AMR)的多尺度计算流体动力学(CFD)模型的发展使快速、大规模和高保真的CFD模拟成为可能。在此类CFD模拟中,交互式原位转向是进行调试、寻找最优解和分析反问题的有效工具。我们提出了一种用于GPU超级计算机上大规模CFD模拟的交互式原位转向框架。该框架采用了基于原位粒子的体积渲染(PBVR)、原位数据采样和基于文件的控制,可以在超级计算机和用户pc之间进行转向参数、压缩可视化粒子数据和采样监测数据的交互和异步通信。并行化的PBVR在主机CPU上进行处理,以避免干扰GPU上的CFD模拟。我们将所提出的框架应用于实时羽散分析代码CityLBM,该代码使用GPU超级计算机在块AMR网格上计算晶格玻尔兹曼方法。在数值实验中,我们解决了从监测点观测数据中寻找污染源的反问题,并通过原位转向框架验证了人在环方法的有效性。图形抽象
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引用次数: 0
Cavitation analysis in a re-designed direct acting pressure relief valve through flow visualization method 用流动可视化方法对重新设计的直接作用式减压阀进行气蚀分析
IF 1.7 4区 计算机科学 Q3 COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS Pub Date : 2023-09-07 DOI: 10.1007/s12650-023-00943-1
A. Sharma, N. Kumar, Alokekumar Das
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引用次数: 0
期刊
Journal of Visualization
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