Three-dimensional Simulation of Wave Reflection and Pressure Acting on Circular Perforated Caisson Breakwater by OLAFOAM

Abstract

: OLAFOAM is the powerful CFD code and is an expanded version of OpenFOAM ® , for wave mechanics simulation. The OpenFOAM ® does provide many solvers to correspond to each object of the numerical calculation in a variety of fields. OLAFOAM's governing equation bases on VARANS (Volume-Averaged Reynolds-Averaged Navier-Stokes) equation, and the finite volume method is applied to numerical techniques. The program is coded in C++ and run on the Linux operating system. First of all, in this study, OLAFOAM was validated for 1) wave transformation inside porous structure under bore and regular wave conditions, 2) wave transformation by submerged breakwater under regular wave condition, and 3) regular wave transformation and resultant vertical velocity distribution under current by comparison with existing laboratory measurements. Hereafter, this study, which is almost no examination carried out until now, analyzed closely variation characteristics of water surface level, wave height, frequency spectrum, breaking waves, averaged velocity and turbulent kinetic energy around porous submerged breakwater in the wave and current coexisting field for the case of permeable or impermeable rear beach. It was revealed that the wave height fluctuation according to current direction(following or opposing) was closely related to the turbulent kinetic energy, and others.

Using a porous-media approach for CFD modelling of wave interaction with thin perforated structures

“…This approach is also used to derive porosity coefficients from the model as done by Valizadeh et al (2018), Chen et al (2019) or Poguluri and Cho (2020) in the context of vertical perforated sheet breakwaters. It is also used when the perforations are large and the flow behaviour is highly anisotropic, for instance to study the interaction of irregular waves with a caisson breakwater with circular perforations as done by Lee et al (2017). In these cases, a fine mesh with a large number of mesh cells is required for both a sufficient geometry resolution as well as to achieve high mesh-quality levels in order to support solver and scheme stability.…”

A Review on the Modelling of Wave-Structure Interactions Based on OpenFOAM

“…Also Jensen et al [133] and Higuera et al [140] have used it for the validation of their porosity solvers where they followed the setups by Lin [141] and Liu et al [142]. Additional examples of CFD modelling for wave interaction with microscopically resolved porous structures are works by Wu and Hsiao [143] on solitary wave interaction with a submerged slotted barrier, and by Lee et al [144] on wave interaction with a circular perforated caisson breakwater. Further examples of wave interaction with porous structures represented by their macro-scale effects are studies by Srineash et al [145] in the context of dams, by Brito et al [146] on submerged vegetated floodplains and work by Zhao et al [147] on a vertical net panel.…”

A review on the modelling of wave-structure interactions based on OpenFOAM

“…Also Jensen et al [138] and Higuera et al [135] have used it for the validation of their porosity solvers where they followed the setups by Lin [142] and Liu et al [143]. Additional examples of CFD modelling for wave interaction with microscopically resolved porous structures are works by Wu and Hsiao [144] on solitary wave interaction with a submerged slotted barrier, and by Lee et al [145] on wave interaction with a circular perforated caisson breakwater. Further examples of wave interaction with porous structures represented by their macro-scale effects are studies by Srineash et al [146] in the context of dams, by Brito et al [147] on submerged vegetated floodplains and work by Zhao et al [148] on a vertical net panel.…”