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Shi, Rui (author), Wüthrich, D. (author), Chanson, Hubert (author)Transient motion, turbulence and bubble dynamics make any velocity quantification extremely difficult in unsteady gas–liquid flows. In the present study, novel Eulerian and Lagrangian techniques of velocimetry were developed, using both intrusive and non-intrusive measurements. The selected unsteady gas–liquid flow was a breaking bore,...journal article 2023
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Shi, Rui (author), Wüthrich, D. (author), Chanson, Hubert (author)Continuing from the part 1 (Shi et al., 2022) this paper presents an experimental investigation of transient void fraction and bubble statistics in a highly turbulent breaking bore with Fr<sub>1</sub>=2.4. The measurements were conducted using a combination of dual-tip phase-detection probes and an ultra-high-speed video camera. The enclosed...journal article 2023
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- Wüthrich, D. (author), Shi, Rui (author), Chanson, Hubert (author) journal article 2023
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van Gent, M.R.A. (author), Buis, L. (author), van den Bos, J.P. (author), Wüthrich, D. (author)Wave transmission at low-crested coastal structures has been studied, based on physical model tests with trapezoidal impermeable, permeable and perforated structures. The differences between wave transmission at impermeable and permeable structures are relatively limited. For a perforated hollow structure with an impermeable vertical screen...journal article 2023
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- Arosquipa-Nina, Yvan (author), Shi, Rui (author), Wüthrich, D. (author), Chanson, Hubert (author) journal article 2023
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- Yan Toe, C. (author), Uijttewaal, W.S.J. (author), Wüthrich, D. (author) conference paper 2022
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Estrella, Jorge (author), Wüthrich, D. (author), Chanson, Hubert (author)A hydraulic jump is a region of rapidly-varied flow that is extremely turbulent. While the one-dimensional continuity and momentum principles have been successfully applied to express the relationships between upstream and downstream conditions, the three-dimensional equations cannot be resolved without some complicated turbulence closure,...journal article 2022
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- Korswagen, Paul A. (author), Harish, Selvam (author), Oetjen, Jan (author), Wüthrich, D. (author) report 2022
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Arosquipa Nina, Yvan (author), Shi, Rui (author), Wüthrich, D. (author), Chanson, Hubert (author)Self-aerated free-surface flow studies have a more recent history compared to classical fluid dynamics. Traditional velocimetry techniques are adversely affected by the presence of gas–liquid interfaces. In the present study, detailed air-water flow measurements were performed in a highly turbulent free-surface flow, and three velocimetry...journal article 2022
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Nielsen, Peter (author), Xu, Beibei (author), Wüthrich, D. (author), Zhang, Shaotong (author)The propagation of dam-break waves on different rough beds was observed to be quasi-steady in the range < [CDATA[11.3 < x/h dam, where is measured from the dam position. These quasi-steady propagation speeds converge with the steady ideal fluids model of Stoker (Water Waves, 1957, Interscience) when the tailwater depth becomes greater...journal article 2022
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Wüthrich, D. (author), Shi, Rui (author), Chanson, Hubert (author)Abstract: Hydraulic jumps are commonly employed as energy dissipators to guarantee long-term operation of hydraulic structures. A comprehensive and in-depth understanding of their main features is therefore fundamental. In this context, the current study focused on hydraulic jumps with low Froude numbers, i.e. Fr<sub>1</sub> = 2.1 and 2.4, at...journal article 2022
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Wüthrich, D. (author), Shi, Rui (author), Chanson, Hubert (author)Breaking bores are commonly observed in a number of natural processes, often associated with the presence of a transient mixture of air and water, with intense recirculation, air bubble entrainment, and splashing. Two-phase flow measurements in such highly unsteady flows cannot be based on long-duration measurements and require novel ensemble...journal article 2022
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Arosquipa Nina, Yvan (author), Shi, Rui (author), Wüthrich, D. (author), Chanson, Hubert (author)On a stepped spillway, the staircase invert profile generates some intense turbulent dissipation during the spill, associated with a significant reduction of kinetic energy, as well as strong self-aeration. The present study focused on the effects of inclined downward steps on the air-water flow properties, flow resistance, and head losses...journal article 2022
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Nina, Yvan Arosquipa (author), Shi, Rui (author), Wüthrich, D. (author), Chanson, Hubert (author)At hydraulic structures, some strong interactions may develop between fast flowing waters and the air adjacent to the water in motion that enhance the air-water transfer of atmospheric and volatile gases in the flow. In turn, in-stream structures may contribute to the aeration and re-oxygenation during overflow. The present study aims to...journal article 2022
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Wüthrich, D. (author), Teng, Djimin (author), Ke, Q. (author), Diaz, Andres (author), Bortolotti, A. (author), Iuorio, Luca (author), Hooimeijer, F.L. (author)In a world influenced by climate change and consequently sea-level rise, extreme floods are expected to become more frequent in the future, representing a serious threat for riverine and coastal settlements. Therefore, flood protection is a large component of climate adaptation and should be closely related to other measures of climate...conference paper 2022
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Wüthrich, D. (author), Shi, Rui (author), Chanson, Hubert (author)Highly turbulent free-surface flows are characterised by complex and rapidly varying air-water surface features, leading to enhanced surface roughness, breakup and disintegration processes. Such a strong free-surface turbulence has an impact on a number of environmental flows, and a deeper understanding of its physical nature is fundamental....journal article 2021
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Rongen, G.W.F. (author), Strijker, B. (author), Pol, J.C. (author), Kok, M. (author), Kolen, B. (author), Rikkert, S.J.H. (author), Schlumberger, J. (author), van Haren, M. (author), Wüthrich, D. (author)In juli 2021 zijn grote delen van Limburg getroffen door hevige regenval en overstromingen. Ook delen van België en Duitsland overstroomden met zeer veel schade en verlies aan mensenlevens tot gevolg. Dit betrof een extreme en ongeëvenaarde gebeurtenis met enorme impact. Daarom is naar aanleiding van de overstromingen deze verkenning uitgevoerd...report 2021
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Soechiarto, Emelia Dara (author), Wüthrich, D. (author), Chanson, Hubert (author)Partially-filled pipe flows are commonly observed in urban hydraulics, sewers and road crossings. The occurrence of a compression wave in the confined space may result from flash flooding, transient operation or accidental blockage, inducing explosive conditions. In this study, the propagation of a compression wave was studied in a relatively...journal article 2021
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Wüthrich, D. (author), Ylla Arbos, C. (author), Pfister, Michael (author), Schleiss, Anton J. (author)Tsunamis, impulse waves, and dam-break waves are rare but catastrophic events, associated with casualties and damage to infrastructures. An adequate description of these waves is vital to assure human safety and to generate resilient structures. Furthermore, a specific building geometry with openings, such as windows and doors, reduces wave...journal article 2020