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Numerical analysis of hydrodynamic interaction between the linear waves of Caspian Sea and Amirkabir semi-submersible drilling platform

Semi-submersible drilling platforms are huge bulk structures for extracting the oil products from great depth of seas. For such bulk structures, the Morrison’s equations are no longer valid for determining the loads applied to the semi-submersible drilling platforms. | Numerical analysis of hydrodynamic interaction between the linear waves of Caspian Sea and Amirkabir semi-submersible drilling platform Engineering Solid Mechanics 1 2013 141-148 Contents lists available at GrowingScience Engineering Solid Mechanics homepage www.GrowingScience.com esm Numerical analysis of hydrodynamic interaction between the linear waves of Caspian Sea and Amirkabir semi-submersible drilling platform Rahmatollah Ghajar and Seyed Mohammad Navid Ghoreishi Mechanical Properties Lab Faculty of Mechanical Engineering K.N. Toosi University of Technology Tehran Iran. ART ICLE INFO ABSTRACT Article history Semi-submersible drilling platforms are huge bulk structures for extracting the oil products Received March 20 2013 from great depth of seas. For such bulk structures the Morrison s equations are no longer valid Received in Revised form for determining the loads applied to the semi-submersible drilling platforms. The diffraction September 14 2013 theory should be used for evaluating the hydrodynamic interactions between the platform and Accepted 18 September 2013 Available online the sea waves. In this theory the Laplace equation is solved by considering the boundary 18 September 2013 conditions of the diffraction theory. In this paper after a brief description of the diffraction Keywords theory the hydrodynamic interactions between the Iran s Amirkabir semi-submersible drilling Diffraction theory platform and the regular linear waves of Caspian Sea is investigated numerically using Hydrodynamic analysis boundary element method in the ANSYS AQWA software. The induced waves exciting forces Semi-submersible drilling platform and moments with different wave heading angles are estimated for six degrees of freedom Regular waves relative to the waves frequencies using the diffraction theory. The performed hydrodynamic analysis is also validated with the previous works performed for Spar platforms. 2013 Growing Science Ltd. All rights reserved. 1. .