A fictitious domain approach based on a viscosity penalty method to simulate wave/structure interaction

Ducassou, B.; Núñez, Juan; Cruchaga, Marcela; Abadie, Stéphane

doi:10.1080/00221686.2017.1289257

Cited by 8 publications

(7 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This tend to show that the trailing waves may not be generated by the slide. In order to evidence this further, a simulation was carried out with a slide artificially forced to stop very early in the simulation of the subaerial case (stop time t s respectively : t = 0.2, 0.3, 0.4, 0.5, 0.6, 0.7 s (t * = 1.6, 2.4, 3.3, 4.1, 4.9, 5.7)) by using penalizing techniques (Ducassou et al, 2017).…”

Section: Discussionmentioning

confidence: 99%

Simulation of energy transfers in waves generated by granular slides

Clous

Abadie

2019

Landslides

View full text Add to dashboard Cite

This paper presents a multi-fluid Navier-Stokes modelling of the waves generated by two granular slides (subaerial and submarine) which were previously studied experimentally and a pure synthetic submarine case used for results interpretation. In the numerical model, air and water are considered as Newtonian fluids. The slide is modelled as a Newtonian fluid whose viscosity is adjusted to fit the experimental results. Once the viscosity is adjusted, the first and the second waves are shown to be accurately reproduced by the model even though the computed slide is slower. For the subaerial case, the viscosity value found is shown to be consistent with the granular µ(I) rheological law. The second part of this work focuses on the energy transfers between a slide and its generated waves. Energy balance is computed in each phase. The wave energy is evaluated in the wave propagation zone. Energy dissipation, kinematic and potential energies are taken into account in the computation of energy transfer ratio allowing for a better understanding of the phenomena. In light of these results, the wave train generation process is discussed as well as the importance of the slide dynamics in the wave generation stage. The amount of energy transferred to wave is not constant with time and the transfer rate depends strongly on the definition of this rate as well as the case considered. For instance, in the subaerial case simulated, the energy transferred to surface waves is 30 % of the energy transferred to water at the time the transfer stops, but this conversion rate is only equal to 4 % of the overall available potential slide energy at the end of the process. For the two submarine cases simulated, the corresponding values, equal in both cases, are 2 % and 1 %, respectively. The simulation results also show that the slide energy is transferred to the water in a short period of time at the beginning whatever the case considered. This observation may be related to the initial nil slide velocity (subaerial case) and the relatively large slope values considered (both cases). Nevertheless, the results illustrate the importance of accurate simulation of the slide dynamics within the wave generation process.

show abstract

Section: Discussionmentioning

confidence: 99%

Simulation of energy transfers in waves generated by granular slides

Clous

Abadie

2019

Landslides

View full text Add to dashboard Cite

show abstract

“…Since these phenomena take place on a large space scale, the proposed model seems well adapted. Eventually, a challenging objective is the handling of submerged body [15,22]. This issue seems not at hand at the moment since a more complex description of the flow is required.…”

Section: Resultsmentioning

confidence: 99%

Congested shallow water model: on floating body

Godlewski¹,

Parisot²,

Sainte-Marie³

et al. 2021

The SMAI Journal of Computational Mathematics

View full text Add to dashboard Cite

We consider the floating body problem in the vertical plane on a large space scale. More precisely, we are interested in the numerical modeling of a body floating freely on the water such as icebergs or wave energy converters. The fluid-solid interaction is formulated using a congested shallow water model for the fluid and Newton's second law of motion for the solid. We make a particular focus on the energy transfer between the solid and the water since it is of major interest for energy production. A numerical approximation based on the coupling of a finite volume scheme for the fluid and a Newmark scheme for the solid is presented. An entropy correction based on an adapted choice of discretization for the coupling terms is made in order to ensure a dissipation law at the discrete level. Simulations are presented to verify the method and to show the feasibility of extending it to more complex cases.

show abstract

“…The model used to perform this research is the multi-fluid Navier-Stokes Volume Of Fluid (VOF) model THETIS. It has been validated in numerous studies related to water waves [1,38,2,46,15,17] and more specifically to wave impact in Mokrani and Abadie [45] and Martin-Medina et al [42] .…”

Section: Modelmentioning

confidence: 93%