Draft 1 338089811 - Revision history

Test at 13:57, 31 July 2018

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 ==ABSTRACT==
 This paper shows the recent work of the authors in the development of a time-domain FEM model for evaluation of the seal dynamics of a surface effect ship. The fluid solver developed for this purpose, uses a potential flow approach along with a stream-line integration
 of the free surface. The paper focuses on the free surface-structure algorithm that has been developed to allow the simulation of the complex and highly dynamic behavior of the seals in the interface between the air cushion, and the water.

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 URL: [http://www.cimne.com/ http://www.cimne.com/] (B. Serván-Camas).</div>
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 ==ABSTRACT==
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 ==ABSTRACT==
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-This paper shows the recent work of the authors in the development of a time-domain FEM model for evaluation of the seal dynamics of a surface effect ship. The fluid solver developed for this purpose, uses a potential flow approach along with a stream-line integration of the free surface. The paper focuses on the free surface-structure algorithm that has been developed to allow the simulation of the complex and highly dynamic behavior of the seals in the interface between the air cushion, and the water.
+This paper shows the recent work of the authors in the development of a time-domain FEM model for evaluation of the seal dynamics of a surface effect ship. The fluid solver developed for this purpose, uses a potential flow approach along with a stream-line integration
 The developed fluid-structure interaction solver is based, on one side, on an implicit iteration algorithm, communicating pressure forces and displacements of the seals at memory level and, on the other side, on an innovative wetting and drying scheme able to predict the water action on the seals. The stability of the iterative scheme is improved by means of relaxation, and the convergence is accelerated using Aitken’s method.

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 ===2.1 Governing equations===
+xxxxxxx
 We consider the first order diffraction-radiation problem of a ship moving with forward speed <math display="inline">\mathit{\boldsymbol{u}}</math>. We assume that the flow is incompressible and irrotational, so that the velocity field <math display="inline">\boldsymbol{v}</math>, is derived from a potential function <math display="inline">\phi</math>  as: <math display="inline">\boldsymbol{\, v=}\nabla \phi</math> . The following assumptions are made on the order of magnitude of the velocity components and free surface elevation <math display="inline">\eta</math> :

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 <div class="center" style="width: auto; margin-left: auto; margin-right: auto;">
 <sup>1</sup> Centre Internacional de Mètodes Numèrics en Enginyeria (CIMNE)</div>
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 <div class="center" style="width: auto; margin-left: auto; margin-right: auto;">
 Gran Capitán s/n, 08034 Barcelona, Spain</div>

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 <div class="center" style="width: auto; margin-left: auto; margin-right: auto;">
 e-mail : [mailto:julio@cimne.upc.edu julio@cimne.upc.edu], web page: [http://www.cimne.upc.edu http://www.cimne.upc.edu]</div>
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 <sup>2</sup> Universitat Politècnica de Catalunya - BarcelonaTech (UPC)</div>

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