Design optimization of a novel vertical augmentation channel housing a cross-flow turbine and performance evaluation as a wave energy converter

Fixed type-oscillating water column front wall angle variation and impact on chamber performance: CFD numerical wave tank assessment

“…Computational fluid dynamics (CFD) simulations and experimental studies are often employed to determine the optimal turbine placement. But in this study the CFD method is involved for the frontal wall shape optimization [7,[15][16][17]. In addition to the shape and size parameters, the overall chamber geometry needs to be optimized to enhance wave focusing and energy capture.…”

“…• Linear Theory Analysis by Hong et al [6]: They presented numerical estimations of hydrodynamic properties for a floating OWC device using linear theory. • Optimal Moonpool Geometry by Sphaier et al [7]: Their experimental study aimed to find the optimal entrance geometry of a moonpool to minimize vertical water motion during waves, revealing resonant periods and their impact. • BEM Code Predictions by Sykes et al [8]: They employed a Boundary Element Method (BEM) code to predict the displacement and hydrodynamic properties of a floating undamped OWC, comparing results with experiments.…”

“…Japan and Europe regions commercialized floating and fixed type OWC devices as early as 1965, and more recent efforts in Ireland involved testing a 1:4th-scale buoy converter [6]. Fixed OWC devices are typically deployed near the shore in shallow waters, which have lower wave energy compared to offshore areas due to energy dissipation from bottom friction and wave breaking, similar to small scale WEC's [7]. OWCs are celebrated for their elegant and straightforward design and operational principles.…”

“…Monitor points (n-number) for Pressure and Velocity of OWC chamber3. Results and discussion3.1 Grid Independence and validation of the NWT numerical modelTo validate the produced NWT model, present study was wave heights generated H (mm) was compared with the NWT model by AHS Weerakoon et al[33] study experimental NWT model. Referring to…”

Wave Energy Convertor for Bilateral Offshore Wave Flows: A Computational Fluid Dynamics (CFD) Study

“…CFT was utilized as a WEC; Y-H Lee et al 2010 [11] and several other researchers conducted numerical and experimental studies to increase the turbine efficiency as a wave energy convertor in many cases [4,5,[12][13][14][15][16][17][18][19]. A similar experimental and numerical study conducted by Korean researchers at KMOU increased the overall performance of CFT with a nozzle, improving the wave energy device efficiency by 5.49% [20]. The numerical study also proved that the augmentation channel shape is critical for operation, acting as a converging and diverging (vice versa) pathway for the fluid stream [14].…”