Analysis of linear and nonlinear features of a flat plate breakwater with the boundary element method

Lalli, F.; Bruschi, Antonello; Liberti, Luca; Pesarino, Valeria; Bassanini, Piero

doi:10.1016/j.jfluidstructs.2012.01.009

Cited by 15 publications

(2 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The comparison is performed between the FSFS (in this case, due to the geometry, pressure methods cannot be implemented) and a very classical one, i.e. the boundary element method (Lalli 1997;Lalli et al 2012). As in previous examples, convective terms in the Navier-Stokes equation have been neglected.…”

Section: Numerical Resultsmentioning

confidence: 99%

A numerical model for wave-current interaction at the scale of marine engineering

Lalli

Bruschi

Cassese

et al. 2016

Journal of Operational Oceanography

View full text Add to dashboard Cite

In the present paper a numerical method for marine and coastal hydrodynamics is presented. It aims at developing a formulation for the complete wave-current coupling in the time domain. In this framework, both waves and currents are handled by complete Navier-Stokes equations. Indeed, waves are modified by currents and interaction with structures, the flow is forced by waves and structures as well. The numerical solution for fully 3D equations is outlined, showing that the proposed procedure is a revisited version of the fractional step method, i.e. the free surface fractional step method. Some numerical test cases in simple 2D geometries (vertical direction vs direction of wave propagation) are shown.

show abstract

Section: Numerical Resultsmentioning

confidence: 99%

A numerical model for wave-current interaction at the scale of marine engineering

Lalli

Bruschi

Cassese

et al. 2016

Journal of Operational Oceanography

View full text Add to dashboard Cite

show abstract

“…A sequence composed of s i , a i , r i and s i+1 (also expressed as tuple (s i , a i , r i , s i+1 )) is used to train the ANN in the DRL model. Figure 6 further clarifies the process of interaction, from which it is known that N = 64 tuples are first sampled from Buffer and calculated the value of L k (refers to ( 16), (17), and ( 18)) to update the critic networks Q θ k (k = 2) later. Subsequently, actor network π φ and target networks Q θ k and π φ are updated every d = 2 iterations, where π φ is updated by (19) and the expressions to softly update the target networks are given as follows:…”

Section: ) Ann Trainingmentioning

confidence: 99%

A Model Coupling CFD and DRL: Investigation on Wave Dissipation by Actively Controlled Flat Plate

et al. 2022

View full text Add to dashboard Cite

In order to protect structures along the offshore and off the coast, breakwaters are commonly applied to reduce the influence of waves. Flat plate breakwater is studied frequently due to its great performance near the water surface, however, traditional passive methods such as fixed and floating flat plate breakwaters usually fail to give full play of effective wave dissipation when encountering variable unknown incoming waves. Therefore, this paper develops an interdisciplinary model coupling computational fluid dynamics (CFD) and deep reinforcement learning (DRL) to study the wave dissipation of a submerged movable flat plate breakwater against regular waves. An in-house numerical wave tank (NWT) is built to simulate the fluid-structure interaction between the plate and regular waves. The fluid domain in NWT is regarded as environment while the flat plate breakwater is agent. In addition, the wave dissipation strategy is learned by the artificial neural network (ANN) through the continuous wave-plate interaction. It is excited to find that the coupling model is able to learn the control strategies automatically and exhibits good adaptability to the changes of environment. 13 14 INDEX TERMS Wave dissipation, deep reinforcement learning, flat plate breakwater, active controlling, CFD and DRL. culated, of which the results showed that a suitable geo-49 metrical porosity of the upper plate leads to a low level of 50 uplift wave forces on both plates. Reference [17] investi-51 gated the flow field passing over a submerged horizontal 52 flat plate by means of a free surface potential flow model, 53 a form discretized by the Boundary Element Method (BEM), 54 from which the wave dissipation mechanism of a plate-55 type breakwater and the influence of plate thickness, length 56 and submergence was concluded. Reference [18] presented 57 an integrated CFD+CSM approach to fully simulate the 58 hydroelastic interaction between nonlinear ocean waves and 59 a deformable SHPB device, making two major contributions: 60 (a) the research work demonstrated a valid computer-aided 61 approach that can perform hydroelastic offshore and coastal 62 designs; (b) the researching work demonstrated a hydroelastic 63 design methodology for breakwaters for the first time and 64 showed that the deformation of the structure has a significant 65 effect on the wave-damping performance. References [19] 66 and [20] conducted an experiment to research the wave dissi-67 pation performance of a twin-plate considering various wave 68 conditions. References [21] and [22] investigated the interac-69 tion between freak waves based on numerically investigating 70 the interaction characteristics of horizontal deck structures 71 and freak waves, which revealed the corresponding phenom-72 ena, wave loads, and structural response. Reference [23] 73 further studied the interaction between Peregrine breather-74 based freak waves and twin-plate breakwaters, including the 75 characteristics of interaction phenomena, transmitted wave 76 surface, wave loads, and st...

show abstract

Inverse Calculation of Wave-Absorbing Structure Dimensions Based on Extended ANFIS Model

et al. 2018

View full text Add to dashboard Cite

Analysis of linear and nonlinear features of a flat plate breakwater with the boundary element method

Cited by 15 publications

References 17 publications

A numerical model for wave-current interaction at the scale of marine engineering

A numerical model for wave-current interaction at the scale of marine engineering

A Model Coupling CFD and DRL: Investigation on Wave Dissipation by Actively Controlled Flat Plate

Inverse Calculation of Wave-Absorbing Structure Dimensions Based on Extended ANFIS Model

Contact Info

Product

Resources

About