Publicações

Gadelho, J.F.M., Lavrov, A. e Guedes Soares, C. (2014), “Modelling the effect of obstacles on the 2D wave propagation with OpenFOAM”, Developments in Maritime Transportation and Exploitation of Sea Resources, 2014, Guedes Soares, C. and López Peña F. (Eds.). Francis & Taylor Group, London, UK, pp. 1057-1065

The main goal of the present work is to develop and calibrate a 2D numerical wave flume determining the effect of obstacles on the wave propagation using the open source Computational Fluid Dynamics (CFD) OpenFOAM software. Because of its open source nature, OpenFOAM is widely used in the solution of CFD problems and has a vast community that develops and tests various solvers, pre and post processing tools, mesh schemes and boundary conditions. In this particular case, the waves2Foam toolbox will be used to generate the propagation of waves in a channel and the wave absorption. This tool is based on the OpenFOAM solver InterFoam which solves free surface Newtonian flows using the NavierStokes equations coupled with a volume of fluid method. This paper presents, first a methodology to calibrate the numerical model based on analytical formulations and experimental results. Secondly, two test cases are used to evaluate the wave transmission and reflection. The calibration methodology is based on two test cases. The first is a basic numerical wave flume with a flat bottom, where the free surface elevations time series will be compared against an analytical formulation. The second case test consists in reproducing the well-known experimental study taken by (Beji & Battjes, 1993) and it represents the wave transformation over a submerged bar. The results of two case tests are presented. The first case test is based on a half-submerged stationary object and it will be used mostly to evaluate the wave reflection in front of the object and the wave transmission in the back. The second case test is a full-submerged stationary vertical plate and it will be used to study the wave transformation along the flume. Results obtained until now shows that it is possible to use OpenFOAM as a 2D numerical wave flume. It can generate regular and irregular waves and it can reproduce with good accuracy the free surface elevation time series and describe the complex processes of wave transformation and energy exchange from low to high harmonics.

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