A study of the vibration of a horizontal U-bend subjected to an internal upwards flowing air–water mixture

Moerloose, Laurent De; Degroote, Joris

doi:10.1016/j.jfluidstructs.2020.102883

Cited by 6 publications

(3 citation statements)

References 27 publications

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“…This is also the case for liquid flows containing large air bubbles such as in the slug or intermittent flow regime which are of particular interest in the present research [16]. The same method has been succesfully applied to internal slug flow in previous work [17].…”

Section: Introductionmentioning

confidence: 82%

A Novel Inlet Model for Two-Phase Bubbly Axial Flow Through a Tube Bundle

Moerloose¹,

Paepe²,

Degroote³

2021

14th WCCM-ECCOMAS Congress

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In numerical research about two-phase flow in tube bundles, mainly two trends are distinguishable. On the one hand, some studies start from the assumption that only relatively small bubbles occur in a continuous liquid flow, for which typically Eulerian-Lagrangian modelling is appropriate. This approach is not suitable when modelling flow-induced vibrations in tube bundles, as the most severe vibration conditions are achieved in intermittent, churn or slug flow. On the other hand, some studies focus on accurate numerical modelling of the bubble shape. In that case, it is customary to start from a bubble which is already present inside the domain. However, in order to simulate a sufficiently long flow time which is of interest in the current research, the bubbles should enter the domain through an inlet boundary. In this paper, a new inlet model is proposed which defines a transient inlet boundary condition to be applied in a subsequent Eulerian simulation, more specifically using the Volume-Of-Fluid method. In the first part of this paper, the inlet model is described. The model guarantees the introduction of a userspecified amount of gas during a set time-interval at locations in space and time that are chosen randomly. Subsequently, the model is tested on a 3x5 tube bundle subjected to an axially flowing air/water mixture. The computational time required to complete the inlet model is reported for different values of the most important model parameters. Finally, the computational effort of the new inlet model is compared to that of a simulation with a precursor-domain where bubbles are created by break-up of air jets imposed at the inlet.

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Section: Introductionmentioning

confidence: 82%

A Novel Inlet Model for Two-Phase Bubbly Axial Flow Through a Tube Bundle

Moerloose¹,

Paepe²,

Degroote³

2021

14th WCCM-ECCOMAS Congress

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“…It was observed that the response displacement reduces with a decrease in the gas-liquid ratio. Laurent et al [18] numerically investigated the two-phase flow in a U tube and found that the structure vibration is closely related to the damping coefficient.…”

Section: Introductionmentioning

confidence: 99%

Flow-Induced Vibration of a Reversed U-Shaped Jumper Conveying Oil-Gas Two-Phase Flow

Zhu

Tang

Li³

2023

Processes

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Subsea jumpers connecting the underwater wellhead and nearby manifold commonly undergo flow-induced vibration (FIV) due to the spatially frequent alteration in the flow direction, velocity, pressure and phase volume fraction of the oil–gas two-phase flow, potentially leading to fatigue damage. This paper reports the numerical results of the FIV of a reversed U-shaped jumper excited by gas–liquid two-phase flow, which evolves from the initial slug flow with a fixed gas–liquid ratio of 1:2 when transporting through the jumper. The FIV response and flow pattern evolution are examined with a gas flow rate of Qg = 4–12 kg/s and a liquid flow rate of QL = 96–288 kg/s. When the gas–liquid flow passes through the jumper, the flow regime subsequently presents the slug flow, bubble flow, churn flow and imperfect annular flow. The out-of-plane response frequency coincides with the pressure fluctuation frequency for the four connecting bends, suggesting the fluid–structure interaction (FSI). Nevertheless, the vibration displacement is limited with the maximum value less than 0.0014D (where D is the jumper diameter) in the present considered flow rate range.

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“…pipe flow, it is reasonably straightforward to introduce stratified or slug flow at the inlet. The former does not require a transient condition whereas the latter can be modelled with a periodic sequence of air bubbles and water slugs, as was done in previous work (De Moerloose and Degroote (2020)). Furthermore, the spatial bubble distribution of bubbles in pipe flow is naturally limited by the tube diameter.…”

Section: Introductionmentioning

confidence: 99%