Browsing by Author "Kumawat, A.K."

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    Numerical investigation of semi-submersible floating wind turbine combined with flap-type WECs
    (Springer, 2019) Kumawat, A.K.; Karmakar, D.; Guedes Soares, C.G.
    Offshore renewable energy has great potential to meet the increasing energy demands. Ammon different energy source, the offshore wave and wind energy are considered the best possible option as renewable source. To increase renewable energy yield per unit square kilometre of ocean space, there is an increasing interest in investigating the technological and the economic feasibility of combining offshore wind turbines with wave energy converters. In the past two decades, combined concepts of utilizing different floating support platforms and wave energy converters have been studied. In the present study, the hydrodynamic coefficients and response amplitude operators (RAOs) of semi-submersible floater combined with flap-type wave energy converter is analysed. The semi-submersible floater with flap-type wave energy converter is a combined concept of wave and wind energy converters which consists of three elliptical cylinder flap-type wave energy converters (WECs) and a 5 MW floating wind turbine installed on semi-submersible platform. The hydrodynamic coefficients are calculated in frequency domain and the power take off (PTO) system is modelled as a linear damper and spring. A parametric study is made to compute hydrodynamic coefficients of flap and three column semi-submersible platform combined wave and wind energy system. Further, RAO analysis is performed for three column semi-submersible platform relative to combined wave and wind energy platform with incident wave heading angles. © Springer Nature Singapore Pte Ltd. 2019.
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    Wave energy conversion by multiple bottom-hinged surging WEC
    (Springer, 2019) Kumawat, A.K.; Karmakar, D.; Guedes Soares, C.G.
    The power capture and performance of arbitrary array of submerged bottom-hinged deflectors of finite width is analysed for two different configurations. The bottom-hinged deflectors are modelled as non-zero thickness and rotated at small angle in the vertical plane about an axis located in the seabed orthogonal to the direction of the wave propagation. The numerical study is performed on the hydrodynamic performance of the flapping deflector type oscillating wave surge converter (OWSC). Three-dimensional boundary element method is used to calculate hydrodynamic coefficients in frequency domain. A parametric study was made by comparing two geometrically different deflectors, i.e., rectangular and wedge cross-section for power capture assessment. Further, the analysis is performed for arbitrary array configurations of OWSC with oblique incident wave heading angles and the power take off (PTO) system is modelled as a linear damper and spring. The study for multiple arrays of the flap-type wave energy converters is essential for economical design of project in order to exploit more renewable energy from the ocean waves. © Springer Nature Singapore Pte Ltd. 2019.