Numerical Simulation of a Piston-Type Wavemaker using Lattice-Boltzmann Method with Moving Nested Grids

Document Type : Research Article

Authors

1 Engineering Department, Ferdowsi University of Mashhad, Mashhad, Iran

2 Engineering Department, Quchan University of Technology, Quchan, Iran

3 Engineering Department, University of Birjand, Birjand, Iran

Abstract

Applications of the wavemaker mechanisms in the experimental investigations of wave-structure interactions have attracted various researchers’ attention. Numerical simulations capable of wave generation in a water tank are appropriate substitutes for the expensive experimental studies. Due to the large values of the wave length to wave height ratio and also the water depth to wave height ratio, extremely fine grid points are generally required at the gas-liquid interface and this causes the numerical simulations to be very time consuming. In this study, a new method is proposed for numerical simulation of a piston-type wavemaker which is faster than the previous methods. The proposed method is a combination of a Lattice-Boltzmann method with multilayer moving nested grids and iWeno5 method for treating the kinematic free surface boundary condition. The numerical results of the proposed method are compared with the analytical and experimental data, where a good agreement is observed.

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References

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Amirkabir Journal of Mechanical Engineering
Volume 50, Issue 4
November and December 2018
Pages 799-812

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