SIMULATION OF IRREGULAR WAVES OVER SUBMERGED OBSTACLE ON A NURBS POTENTIAL NUMERICAL WAVE TANK

Authors

  • ARASH ABBASNIA
  • MAHMOUD GHIASI

Keywords:

IRREGULAR WAVE, NUMERICAL WAVE TANK, POTENTIAL FLOW, MIXED EULERIAN-LAGTRANGIAN, NON-UNIFORM RATIONAL B-SPLINE

Abstract

IN THIS PAPER, A FULLY NON-LINEAR THREE DIMENSIONAL NUMERICAL WAVE TANK (NWT) IS DEVELOPED FOR STUDYING PROPAGATION AND SCATTERING OF NON-LINEAR RANDOM SEA WAVE OVER BOTTOM SUBMERGED BARS. THE SIMULATION OF FULLY NON-LINEAR FREE-SURFACE IS BASED ON NON-UNIFORM RATIONAL B-SPLINE FORMULATION (NURBS) AND MIXED EULERIAN-LAGRANGIAN METHOD (MEL). HIGH-ORDER BOUNDARY INTEGRAL EQUATION IS USED TO SOLVE THE LAPLACE EQUATION IN THE EULERIAN FRAME. TO UPDATE THE FREE-SURFACE, TIME MARCHING APPROACH INCLUDING MATERIAL NODE METHOD AND FOURTH ORDER RUNGE-KUTTA TIME INTEGRATION SCHEME IS USED. TO OBTAIN APPROPRIATE NUMERICAL SOLUTIONS FOR WAVE PROPAGATION PROBLEM, DAMPING ZONE IS SET AT THE DOWNSTREAM. ALSO, THE NURBS APPROXIMATION IS EMPLOYED TO EVALUATE THE VELOCITY OF THE FREE-SURFACE PARTICLES. PROPAGATION OF REGULAR AND IRREGULAR WAVES IN A NWT IS INVESTIGATED AND COMPARED WITH THE AVAILABLE EXPERIMENTAL AND NUMERICAL DATA. TRANSMISSION OF THE RANDOM SEA WAVE OVER SUBMERGED BARS IS ALSO COMPARED WITH THE EXPERIMENTAL AND PRIOR NUMERICAL STUDIES.

Author Biographies

ARASH ABBASNIA

MARITIME ENGINEERING DEPARTEMENT, AMIRKABIR UNIVERSITY OF TECHNOLOGY

MAHMOUD GHIASI

MARITIME ENGINEERING DEPARTEMENT, AMIRKABIR UNIVERSITY OF TECHNOLOGY

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Published

2014-10-07

Issue

Section

Articles