Osterreichische Wasser- und Abfallwirtschaft最新文献

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[Movement of a fluvial particle under the influence of coherent structures]. [相干结构影响下河流颗粒的运动]。

Osterreichische Wasser- und Abfallwirtschaft

Pub Date : 2023-01-01 Epub Date: 2023-06-07 DOI: 10.1007/s00506-023-00961-1

C Sindelar, J Schobesberger, T Gold, K Reiterer, D Worf, C Hauer, H Habersack

In a fundamental study the influence of coherent structures on the incipient motion of single fluvial grain was experimentally investigated. To fully characterize coherent structures, the three-dimensional velocity field must be known with high temporal resolution. Using a tr-3D PTV system (tr = time-resolved, PTV = particle tracking velocimetry) this could be achieved. The influence of hairpin vortices and counter-rotating longitudinal vortices (VLSM) on sediment transport has been postulated in several studies, but due to the missing 3D information, evidence has been lacking. In the present "Rolling Stones test series", the incipient motion of a single grain was investigated for smooth and rough beds. It could be shown for the first time that both hairpin vortices and VLSM trigger particle entrainment. Hairpin vortices could also be detected on rough beds, contrary to common hypotheses, and triggered particle movement. The long-term study should also find practical applications in the coming years and increase the accuracy of sediment transport calculations in rivers.

在一项基础研究中，通过实验研究了相干结构对单个河流颗粒起动的影响。为了充分表征相干结构，三维速度场必须具有高的时间分辨率。使用tr-3D PTV系统（tr = 时间分辨PTV = 粒子跟踪测速法），这是可以实现的。发夹涡和反向旋转纵向涡（VLSM）对泥沙输移的影响已在几项研究中得到假设，但由于缺乏3D信息，缺乏证据。在目前的“滚石试验系列”中，对光滑和粗糙床的单个颗粒的初始运动进行了研究。首次表明发夹涡和VLSM都会引发颗粒夹带。发夹涡也可以在粗糙的床上探测到，这与常见的假设相反，并引发粒子运动。这项长期研究还应在未来几年找到实际应用，并提高河流输沙计算的准确性。

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引用次数: 0

[Experimental and numerical investigation of fluid-particle-interactions in water]. [水中流体-颗粒相互作用的实验和数值研究]。

Osterreichische Wasser- und Abfallwirtschaft

Pub Date : 2023-01-01 Epub Date: 2023-06-07 DOI: 10.1007/s00506-023-00960-2

T Gold, D Worf, K Reiterer, H Habersack, C Sindelar

For the development of improved sediment transport models, the basic understanding of the interaction between the solid particle and the moving fluid (water) is important. In this article, current developments in the field of fluid-particle interaction are presented based on two research articles by Gold et al. (2023) and Worf et al. (2022). One presented in this article uses state of the art measurement methods to investigate the flow around spheres of different densities that oscillate in initially resting body of water. For the spherical pendulum a similar vortex shedding characteristic was observed for all investigated fluid density ratios ( $m^{*} = ρ_{S} / ρ_{F} = 1.14, 14.95$ , density ratio between solid and fluid). A new object tracking method (DOT) is also presented, which enables temporally and spatially resolved analysis of flow structures in the fluid field. The experimental results of Gold et al. (2023) show, that vortex shedding occurs during the first period. This vortex propagates downward and eventually dissipates. Furthermore, a damping optimum of the spherical pendulum in the range of $m^{*} = 2.50$ was observed. Additionally, an experiment with a cylindrical pendulum with $m^{*} = 4.98$ was investigated numerically utilizing an immersed boundary method. The process of creation and separation up to the dissipation of a vortex ring was described. Furthermore, this investigation by Worf et al. (2022) described the creation of tip vortices. These were connected with the development of the three-dimensional flow and added mass coefficient.

对于改进的泥沙输移模型的开发，对固体颗粒和运动流体（水）之间相互作用的基本理解是重要的。本文在Gold等人的两篇研究文章的基础上，介绍了流体与颗粒相互作用领域的最新进展。（2023）和Worf等人。（2022）。本文中提出的一种方法使用最先进的测量方法来研究在初始静止水体中振荡的不同密度球体周围的流动。对于球形摆，在所有研究的流体密度比（m*=ρS/ρF=1.14，14.95，固体和流体之间的密度比）下都观察到类似的旋涡脱落特性。还提出了一种新的物体跟踪方法（DOT），该方法能够对流场中的流动结构进行时间和空间分辨分析。Gold等人的实验结果。（2023）表明，旋涡脱落发生在第一阶段。这个涡流向下传播并最终消散。此外，在m*=2.50的范围内观察到球面摆的阻尼最优值。此外，利用浸入边界法对m*=4.98的圆柱形摆的实验进行了数值研究。描述了涡流环的产生和分离直至消散的过程。此外，Worf等人。（2022）描述了尖端涡流的产生。这些都与三维流动的发展和附加的质量系数有关。

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Expert:innen im ÖWAV. ÖWAV 的专家。

Osterreichische Wasser- und Abfallwirtschaft

Pub Date : 2022-01-01 Epub Date: 2022-11-18 DOI: 10.1007/s00506-022-00909-x

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Mitteilungen des ÖWAV. ÖWAV 通信。

Osterreichische Wasser- und Abfallwirtschaft

Pub Date : 2022-01-01 Epub Date: 2022-03-14 DOI: 10.1007/s00506-022-00858-5

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Anhang 附件

Osterreichische Wasser- und Abfallwirtschaft

Pub Date : 2020-03-23 DOI: 10.1515/9783110588217-014

B. Gordalla

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Abkürzungen

Osterreichische Wasser- und Abfallwirtschaft

Pub Date : 2020-03-23 DOI: 10.1515/9783110588217-204

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12. Badewasser

Osterreichische Wasser- und Abfallwirtschaft

Pub Date : 2020-03-23 DOI: 10.1515/9783110588217-012

F. Tiefenbrunner, C. Zwiener

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8. Toxikologie

Osterreichische Wasser- und Abfallwirtschaft

Pub Date : 2020-03-23 DOI: 10.1515/9783110588217-008

T. Grummt, P.-D. Hansen, H. H. Dieter

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13. Abwasserreinigung

Osterreichische Wasser- und Abfallwirtschaft

Pub Date : 2020-03-23 DOI: 10.1515/9783110588217-013

H. Rüffer, R. Karger, U. Telgmann, H. Horn

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Inhalt 内容

Osterreichische Wasser- und Abfallwirtschaft

Pub Date : 2020-03-23 DOI: 10.1515/9783110588217-toc

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