Browsing by Author "Shirkol, A.I."

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Coupled BEM and FEM for the analysis of floating elastic plate with arbitrary shapes
(2019) Shirkol, A.I.; Nasar, T.
In order to analyse the hydroelastic behaviour of the floating thin elastic plate, a numerical model has been developed by coupling higher-order boundary element method (BEM) and finite element method (FEM). The present model is capable of investigating the very large floating structure of arbitrary shapes at finite and infinite water depths. The developed hybrid model contains the same nodes maintaining the same order and basis function in both the methods. The novelty of this work can be seen in the newly developed modified Green s function. Two geometrical configurations (triangle and trapezoidal) have been analysed. The time required for convergence and deflection of the geometrical model have been captured. Furthermore, the results obtained by Wang and Meylan [2004. A higher-order-coupled boundary element and finite element method for the wave forcing of a floating elastic plate. J Fluids Struct. 19(4):557 572] are used to validate the developed numerical model. It is concluded that the model works better in finite water depth for trapezoidal shape. 2019, 2019 Informa UK Limited, trading as Taylor & Francis Group.
Coupled BEM and FEM for the analysis of floating elastic plate with arbitrary shapes
(Taylor and Francis Ltd. michael.wagreich@univie.ac.at, 2019) Shirkol, A.I.; Nasar, T.
In order to analyse the hydroelastic behaviour of the floating thin elastic plate, a numerical model has been developed by coupling higher-order boundary element method (BEM) and finite element method (FEM). The present model is capable of investigating the very large floating structure of arbitrary shapes at finite and infinite water depths. The developed hybrid model contains the same nodes maintaining the same order and basis function in both the methods. The novelty of this work can be seen in the newly developed modified Green’s function. Two geometrical configurations (triangle and trapezoidal) have been analysed. The time required for convergence and deflection of the geometrical model have been captured. Furthermore, the results obtained by Wang and Meylan [2004. A higher-order-coupled boundary element and finite element method for the wave forcing of a floating elastic plate. J Fluids Struct. 19(4):557–572] are used to validate the developed numerical model. It is concluded that the model works better in finite water depth for trapezoidal shape. © 2019, © 2019 Informa UK Limited, trading as Taylor & Francis Group.
Coupled boundary element method (BEM) and finite element method (FEM) for hydroelastic analysis of floating plate
(Springer, 2019) Shirkol, A.I.; Nasar, T.
In the present study, a numerical model is developed to analyse equation of motion of the plate which is elastic in nature and has a shallow draft L/d ≤ 1/20 (small thickness). The platform may be of any shape (geometry) subjected to monochromatic waves. The developed numerical model is capable of investigating the VFLS of any geometry (arbitrary shape) at finite (0.05 ≤ h/λ ≤ 0.5) depth. A hybrid numerical model is developed and used to solve fluid–structure interaction between the elastic thin plate and water wave. A Higher Order Boundary Element Method (HOBEM) has been adopted in order to maintain the same order, basis function and contains the same nodes between BEM and FEM. Two equations have been determined to build the connection between plate displacement and velocity potential. Displacement of the floating platform has been obtained by solving the plate equation of motion. To solve the plate equation of motion, FEM has been adopted. The equation which relates the plate displacement and water is solved by Boundary Integral Equation (BIE). A modified Green’s function which differs from the bygone Green’s function has been developed by using the Bessel, Hankel and Struve functions of order zero. Both the equations are solved simultaneously to get the displacement of floating elastic plate and velocity potential. The results obtained are validated with Wang (J. Fluids Struct. 19:557–572, 2004 [22]). © Springer Nature Singapore Pte Ltd. 2019.
Coupled boundary element method and finite element method for hydroelastic analysis of floating plate
(Shanghai Jiaotong University, 2018) Shirkol, A.I.; Nasar, T.
In this study, a numerical procedure has been proposed to analyze the equation of motion of the elastic plate which is elastic in nature and having shallow draft (small thickness) with arbitrary geometry subjected to linear wave force at a fixed frequency. Investigation on the convergence of maximum deflection of the floating plate has been carried out. A hybrid model has been developed (coupling between FEM and BEM) which contains same nodes, maintaining the same order and basis function in both the methods. To develop the relationship between the displacement of the plate and the velocity potential under the plate, two equations have been derived. The first equation is derived from the equation of motion for the plate and is solved by finite element method (FEM) to extract the displacement of the floating structure. The second equation is from water wave theory which is based on boundary integral equation that relates the displacement of the floating plate and velocity potential using free-surface Green's function. To get the displacement of floating elastic plate and velocity potential both the equations are solved simultaneously. Results are presented for modified Green's function which has been derived and validated with the results of Meylan (2004). The performance of the developed model is examined by the convergence rate, simulation time. It is learnt that the model works well in finite depth whereas its performance in infinite depth lags by an average of 20% in simulation time than the results obtained by Meylan (2004). © 2017 Shanghai Jiaotong University
Wave interaction with floating platform of different shapes and supports using BEM approach
(2017) Shirkol, A.I.; Nasar, T.
Wave interaction with a floating thin elastic plate which can be used as floating platform is analyzed using Boundary Element Method (BEM) for different shapes such as rectangular, circular and triangular. Different support conditions are considered and the performance of the floating platform under the action of ocean waves is explored. The study is performed under the assumption of linearized water wave theory and the floating elastic plate is modelled based on the Euler-Bernoulli beam theory. Using Galerkin�s approach, a numerical model has been developed and the hydrodynamic loading on the floating elastic plate of shallow draft (thickness) is investigated. The wave forces are generated by the numerical model for the analysis of the floating plate. The resulting bending moment and optimal deflection due to encountering wave force is analysed. The present study will be helpful in design and analysis of the large floating platform in ocean waves. � 2017 ANAME Publication. All rights reserved.
Wave interaction with floating platform of different shapes and supports using BEM approach
(Department of Naval Architecture and Marine Engineering mmkarim@name.buet.ac.bd, 2017) Shirkol, A.I.; Nasar, T.
Wave interaction with a floating thin elastic plate which can be used as floating platform is analyzed using Boundary Element Method (BEM) for different shapes such as rectangular, circular and triangular. Different support conditions are considered and the performance of the floating platform under the action of ocean waves is explored. The study is performed under the assumption of linearized water wave theory and the floating elastic plate is modelled based on the Euler-Bernoulli beam theory. Using Galerkin’s approach, a numerical model has been developed and the hydrodynamic loading on the floating elastic plate of shallow draft (thickness) is investigated. The wave forces are generated by the numerical model for the analysis of the floating plate. The resulting bending moment and optimal deflection due to encountering wave force is analysed. The present study will be helpful in design and analysis of the large floating platform in ocean waves. © 2017 ANAME Publication. All rights reserved.