CFD Analysis of the Performance of a Double Decker Turbine for Wave Energy Conversion

Abstract

The Double Decker Turbine (DDT) is a recent design introduced for oscillating water column (OWC) devices. Its major contribution is the combination of two typical solutions in just one prototype: a self-rectifying performance, to deal with the bidirectional flow, and the twin-turbine concept, allowing the use of unidirectional turbines. This is achieved by a set of two concentric turbines, called external and internal turbines (ExT—InT). In this work, Computational Fluid Dynamics (CFD) numerical model is developed to study in detail the performance of a DDT, where geometrical components for both turbines have been taken from previous works of the authors. The ANSYS-Fluent code was first executed by means of a URANS simulation with a realizable k-ε turbulence model to obtain the performance curve of the turbine under steady conditions. Results obtained reveal its potential with respect to other solutions in the current state-of-the-art of OWC solutions for Wave Energy Conversion. Following a non-steady analysis, we assumed a sinusoidal input from the chamber which also resulted in promising results. Finally, the flow analysis inside the DDT allowed the authors to envisage geometric improvements that could enhance the DDT efficiency on future works.

Analisis Konsep Fisika Osilasi Terkopel pada Sistem Pegas Bermassa

“…Contoh alat dengan memanfaatkan konsep dasar fisika yaitu pada penentuan viskositas zat cair menggunakan konsep osilasi teredam (Asih et al, 2022). Contoh penggunaan konsep fisika lainnya pada perancangan alat konversi energi tenaga gelombang (García-Díaz et al, 2021), penentuan momen inersia dengan osilasi bandul (Indriana, 2020), kontrol PID dengan metode osilasi untuk analisis kecepatan motor DC (Irhas et al, 2020), dan lainnya.…”

Numerical Investigation on the Evolution of Thin Liquid Layer and Dynamic Behavior of an Electro-Thermal Drilling Probe during Close-Contact Heat Transfer

“…However, such close-contact melting characteristics of ETDP are not easily directly measured. Indeed, computational fluid dynamics (CFD) is a promising way to investigate various multi-physics problems in unsteady and quasi-steady states [16][17][18][19] and to obtain useful information which would not be easily measured directly. Therefore, the present study proposes a numerical approach to mimic the drilling process considering the close-contact melting phenomenon.…”