Numerical investigation of the effects of turbulence intensity on dam-break flows

Park, Il-Ryong; Kim, Kwangsoo; Kim, Jin; Van, Suak-Ho

doi:10.1016/j.oceaneng.2012.01.005

Cited by 42 publications

(12 citation statements)

References 27 publications

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“…The experimental data of Zhou et al hang Lee et al (2002b) Zhou et al (1999) have been used for validation of numerical codes in a series of papers. Colagrossi et al Colagrossi and Landrini (2003) and Asai et al Asai et al (2012) reported a good agreement for a Smoothed Particle Hydrodynamics (SPH) solver and Park et al Park et al (2012) and Abdolmaleki et al Abdolmaleki et al (2004) provided similar results for RANS solutions. However, they do not register the initial peak in sensor 4, which is consistent with the present experimental campaign.…”

Section: Comparisons With Published Datamentioning

confidence: 88%

Experimental investigation of dynamic pressure loads during dam break

Lobovský

Botía-Vera

Castellana

et al. 2014

Journal of Fluids and Structures

292

172

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The objectives of this work are to revisit the experimental measurements on dam break flow over a dry horizontal bed and to provide a detailed insight into the dynamics of the dam break wave impacting a vertical wall downstream the dam, with emphasis on the pressure loads. The measured data are statistically analyzed and critically discussed. As a result, an extensive set of data for validation of computational tools is provided.

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Section: Comparisons With Published Datamentioning

confidence: 88%

Experimental investigation of dynamic pressure loads during dam break

Lobovský

Botía-Vera

Castellana

et al. 2014

Journal of Fluids and Structures

292

172

View full text Add to dashboard Cite

show abstract

“…Various turbulence closure models are implemented in OpenFOAM, including the standard κ − ε, κω, and the Baseline (BSL) models [36]. Among these, the κε turbulence model proposed first by Launder and Spalding [37] was widely applied for modeling dam-break flows, see [26,33]. Hence, this is also selected in this work.…”

Section: Turbulence Modelmentioning

confidence: 99%

“…In these models, RANS (Reynoldsaveraged Navier-Stokes) equations coupled with a turbulence closure model were used to describe the behaviors of turbulent dam-break flows. For example, Park [25,26] used Fluent, a commercial CFD software, to investigate the influence of the initial turbulence intensity (TI) on the evolution of a dam-break flow. TI represents the intensity of velocity fluctuation, hence its initial value cannot be calculated theoretically (as for initial still water, the velocity fluctuation is zero).…”

Section: Introductionmentioning

confidence: 99%

“…Its initial value is usually determined empirically and then is iteratively corrected by comparing the experimental data. Park [26] found that the impact pressure on the vertical wall was strongly influenced by the initial TI as well as the frictional drag in the region close to the shallow water front. In contrast, turbulence modeling is not essential for the subsequent impact on a structure by the dam-beak flow.…”

Section: Introductionmentioning

confidence: 99%

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Modeling Impact Load on a Vertical Cylinder in Dam-Break Flows

Chen

Ning

2023

JMSE

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A three-dimensional dam-break flow interacting with a vertical circular and square cylinder is studied in this paper using computational fluid dynamics simulations based on OpenFOAM. This resembles closely a tsunami wave and greenwater flow acting on coastal or on-deck structures, which are of relevance and importance to coastal protections and offshore operations, respectively. The numerical model is verified by comparing with published experimental measurements and is extended to investigate the effects of the structural geometry and the impacting angle β (i.e., the angle between the water front and cylinders) on the total impact load and the surrounding flow field. It is found that the impact event experiences two distinct stages characterized by a constant flow velocity and a negative flow acceleration, respectively. In addition, the total force on a square cylinder is nearly twice that of a circular cylinder although the impacting area is the same. The longitudinal and transverse forces are found to decrease and increase with the impacting angle, respectively. A close interrogation of the surrounding flow field via flow visualization suggests that the way the flow deflected from the cylinder surfaces plays an important role in determining the pressure field and thus the total force behaviors.

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“…A turbulent intensity (I) of 0.1 (10%) was applied by considering the suggestions of Park. et al [23]. L was calculated by L = 0.04d [22], where d is the reference depth given as 0.25 m was assumed at the initial stage considering varying depth of the flume (from~0.5 m to 0).…”

Section: Numerical Setupmentioning

confidence: 99%

Investigating the Behavior of an Onshore Wall and Trench Combination Ahead of a Tsunami-Like Wave

Silva

Araki

2020

Geosciences

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This study investigates a wall and trench combination to identify its benefits as a defense measure against an overtopping tsunami-like wave. The study focuses on several arrangements and geometries of a wall and trench combined structural system, located on the shoreline. The structural system is assessed via a numerical model, which is initially calibrated by physical experiments of tsunami-like wave transformations. A dam break event is used to model a tsunami-like wave interaction with the structures. Resulted wave properties are investigated to identify the behavior of the structural system from the viewpoint of structure geometry and configuration. The results of the study clearly show that the proposed structure combination can effectively reduce the impact of tsunami-like waves, better than a single sea wall defense system. This is achieved by reducing both wave run-up and wave induced current velocities at the lee side of the structure.

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Numerical investigation of the effects of turbulence intensity on dam-break flows

Cited by 42 publications

References 27 publications

Experimental investigation of dynamic pressure loads during dam break

Experimental investigation of dynamic pressure loads during dam break

Modeling Impact Load on a Vertical Cylinder in Dam-Break Flows

Investigating the Behavior of an Onshore Wall and Trench Combination Ahead of a Tsunami-Like Wave

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