Numerical Analysis on Wave Characteristics around Submerged Breakwater in Wave and Current Coexisting Field 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.

Efficiency Assessment of an Amended Oscillating Water Column Using OpenFOAM

“…The methods related to wave generation at OpenFOAM are divided into two main groups. The first is using extensions such as IHFOAM [40][41][42], OlaFoam [43,44], or Wave2Foam [45,46], which are added to standard libraries. The second one uses the standard solvers by considering the physical flap or in-house code correlate with the boundary conditions [47,48].…”

Nonlinear Irregular Waves-current Interaction on Flow Fields with Wave Breaking around Permeable Submerged Breakwater

“…가 대부분 이였으나 최근에는 포텐셜이론의 한계를 극복하기 위해 PIV 혹은 PTV와 같은 영상해석기법 을 이용한 실험적인 연구 (Umeyama, 2009(Umeyama, , 2011)와 Navier-Stokes 방정식에 기반한 수치해석적 연구 (Li et al, 2007;Teles et al, 2013;Markus et al, 2013;Zhang et al, 2014 Lee et al(2016)은 수치해석적 검토 를 위해 오픈소스 CFD 코드인 OLAFOAM (Higuera et al, 2015)을 적용하였으며, OLAFLOM의 타당성은 1) 투과성매질 에서 단파의 작용에 따른 수위변동을 수리모형실험으로부터 규 명한 Liu et al(1999)의 연구, 2) 잠제 주변에서 규칙파의 수 위변동을 고찰한 Ranasinghe et al(2009)…”

Prediction of Mean Water Level Rise Behind Low-Crested Structures and Outflow Velocity from Openings by Using a Hybrid Method Based on Two Dimensional Model Test and Hydrodynamic Numerical Modeling

“…했을 것이기 때문이라고 추정되었다 (Dean et al, 1997) (Hur et al, 2003;Lee et al, 2016;Hur et al, 2017)이나 평면 2차원 연구 (Zanuttigh et al, 2007) (Zanuttigh et al, 2008).…”