Explanipedia

Experimental data on filling and emptying of a large-scale pipeline Open

Xifeng Chen, Qingzhi Hou, Janek Laanearu, Arris S. Tijsseling · 2024

Air Pocket Dynamics under Bridging of Stratified Flow during Rapid Filling of a Horizontal Pipe Open

Katrin Kaur, Janek Laanearu, Ivar Annus · 2022

This paper focuses on air–water interactions during pipe filling. The air–water mixed flow is related to a mobile hydraulic jump in the horizontal pipe section. The trapped water–air front at the crown of the pipe bridge determines the ups…

Three-dimensional CFD analysis of liquid slug acceleration and impact in a voided pipeline with end orifice Open

Junling He, Qingzhi Hou, Jijian Lian, Arris S. Tijsseling, Zafer Bozkuş , et al. · 2022

This research describes the dynamic behavior of an isolated slug driven by pressurized air in a voided line with an end orifice. A three-dimensional (3D) computational-fluid-dynamics (CFD) model is used to simulate the rapid propulsion and…

Three-dimensional CFD analysis of liquid slug acceleration and impact in a voided pipeline with end orifice Open

Junling He, Qingzhi Hou, Jijian Lian, Arris S. Tijsseling, Zafer Bozkuş , et al. · 2022

This research describes the dynamic behavior of an isolated slug driven by pressurized air in a voided line with an end orifice. A three-dimensional (3D) computational-fluid-dynamics (CFD) model is used to simulate the rapid propulsion and…

Air Exchange of the Hydraulic System with Water-Drag-Driven Dynamics Open

Janek Laanearu · 2022

Uni and Bi-directional Exchange Flows in a Large Scale Rotating Channel Open

Claudia Adduce, Maria Chiara, D. de Falco, Alan Cuthbertson, Maria Eletta Negretti , et al. · 2021

Laboratory experiments were performed at the Coriolis Rotating Platform to study uni and bi-directional exchange flows in a trapezoidal channel.PIV and conductivity probes were used to measure velocity fields and density profiles.The rotat…

Experimental study of uni- and bi-directional exchange flows in a large-scale rotating trapezoidal channel Open

Maria Chiara De Falco, Claudia Adduce, Alan Cuthbertson, Maria Eletta Negretti, Janek Laanearu , et al. · 2021

A large-scale experimental study has been conducted at the Coriolis Rotating Platform to investigate the dynamics of uni- and bi-directional exchange flows along a channel with a trapezoidal cross section under the influence of background …

Rotational effects on exchange flows across a submerged sill Open

Alan Cuthbertson, Jarle Berntsen, Janek Laanearu, Magdeli Asplin · 2021

This paper presents new laboratory-scale numerical simulations of density-driven exchange flows generated across an idealised, submerged sill obstruction under both non-rotating and rotating frames of reference using the Bergen Ocean Model…

Discussion of “Rigid Water Column Model for Simulating the Emptying Process in a Pipeline Using Pressurized Air” by Oscar E. Coronado-Hernández, Vicente S. Fuertes-Miquel, Pedro L. Iglesias-Rey, and Francisco J. Martínez-Solano Open

Qingzhi Hou, Shunda Li, Arris S. Tijsseling, Janek Laanearu · 2020

The dynamics of bi-directional exchange flows: implication for morphodynamic change within estuaries and sea straits Open

Maria Chiara De Falco, Claudia Adduce, Alan Cuthbertson, Janek Laanearu, Daniela Malcangio , et al. · 2019

Environmental and geophysical flows, including dense bottom gravity currents in the ocean and buoyancy-driven exchange flows in marginal seas, are strongly controlled by topographic features. These are known to exert significant influence …

The dynamics of bi-directional exchange flows: implication for morphodynamic change within estuaries and sea straits Open

Claudia Adduce, Alan Cuthberson, Janek Laanearu, Maria Chiara De Falco, Daniela Malcangio , et al. · 2019

Environmental and geophysical flows, including dense bottom gravity currents in the ocean and buoyancy-driven exchange flows in marginal seas, are strongly controlled by topographic features. These are known to exert significant influence …

Experimental study of eddy viscosity for breaking waves on sloping bottom and comparisons with empirical and numerical predictions; pp. 299–312 Open

N Oldekop, Toomas Liiv, Janek Laanearu · 2019

Focus is on the turbulence for a plunging breaker. Laser Doppler anemometer point measurements were used to determine the velocity matrix of a breaking wave on a sloping bottom. Using the Reynolds stress anisotropy for incompressible fluid…

Investigation of the Eddy Viscosity for a Breaking Wave in the Surf Zone Open

N Oldekop, Janek Laanearu, Toomas Liiv · 2019

Numerical study of Tallinn storm-water system flooding conditions using CFD simulations of multi-phase flow in a large-scale inverted siphon Open

Katrin Kaur, Janek Laanearu, Ivar Annus · 2017

The numerical experiments are carried out for qualitative and quantitative interpretation of a multi-phase flow processes associated with malfunctioning of the Tallinn storm-water system during rain storms. The investigations are focused o…

A review on potential use of low-temperature water in the urban environment as a thermal-energy source Open

Janek Laanearu, Anatolijs Borodiņecs, Mindaugas Rimeika, Björn Palm · 2017

The thermal-energy potential of urban water sources is largely unused to accomplish the up-to-date requirements of the buildings energy demands in the cities of Baltic Sea Region. A reason is that the natural and excess-heat water sources …

Blockage of saline intrusions in restricted, two-layer exchange flows across a submerged sill obstruction Open

Alan Cuthbertson, Janek Laanearu, Magda Carr, Joël Sommeria, Samuel Viboud · 2017

The work has been supported by European Community’s Seventh Framework Programme through the grant to the budget of the Integrating Activity HYDRALAB IV within the Transnational Access Activities, Contract No. 261520.

Experimental study on dynamical blocking conditions of net exchange flows Open

Janek Laanearu, Alan Cuthbertson, Magda Carr, Joël Sommeria, Madis‐Jaak Lilover , et al. · 2016

Experimental study on dynamical blocking conditions of net exchange flows Janek Laanearu (1), Alan Cuthbertson (2), Magda Carr (3), Joel Sommeria (4), Madis-Jaak Lilover (5), Samuel Viboud (4) and Jarle Berntsen (6) (1) Department of Mecha…

Passenger ship source level determination in shallow water environment Open

Mirko Mustonen, Aleksander Klauson, Janek Laanearu, Madis Ratassepp, Thomas Folégot , et al. · 2016

To study sound radiation from an individual ship, it is required to analyze its spectral and spatial distribution. For an analysis in deep water, standard measurement procedures can be used. Such approach may not be valid in shallow water …

Improved One-Dimensional Models for Rapid Emptying and Filling of Pipelines Open

Arris S. Tijsseling, Qingzhi Hou, Zafer Bozkuş, Janek Laanearu · 2015

Improved one-dimensional (1D) models—compared to previous work by the authors—are proposed which are able to predict the velocity, length, and position of the liquid column in the rapid emptying and filling of a pipeline. The models includ…

EXPERIMENTAL STUDIES OF INTERNAL AND NEAR-BED DYNAMICS OF RESTRICTED EXCHANGE FLOWS Open

Magda Carr, Alan Cuthbertson, Janek Laanearu, Joël Sommeria, Jonathan Kean , et al. · 2015

International audience

Water-column mass losses during the emptying of a large-scale pipeline by pressurized air; pp. 8–16 Open

Janek Laanearu, Qingzhi Hou, Ivar Annus, Arris S. Tijsseling · 2015

In many industrial applications the liquid trapped inside long pipelines can cause a number of problems. Intrusion of the pressurized air on top of the water column inside the horizontal pipeline can result in a less or more mixed stratifi…

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