Browsing by Author "Santoso, Rangga E."

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    CFD-based j-shaped blade design improvement for vertical axis wind turbines
    (MDPI, 2022-11-15) García Auyanet, Antonio; Santoso, Rangga E.; Mohan, Hrishikesh; Rathore, Sanvay S.; Chakraborty, Debapriya; Verdin, Patrick G.
    The need for an increase in energy harvesting has led to novel ideas and designs to extract more power from wind. One innovative solution is through the use of J-shaped blades for Darrieus vertical axis wind turbines (VAWTs), which is based on the removal of a portion of a conventional blade, either on the pressure or suction side. Although improvements in the self-starting capabilities of VAWTs have been reported when using such blades, the literature only studied hollow blades, showing a hair-like structure. This work numerically investigates six different J-shaped designs. A turbine comprising NACA0015-based blades forms the base case and is used to evaluate the 2D numerical models. Results show that blades with an external cut systematically outperform those designed with an internal cut. In addition, all proposed cut-based designs are shown to improve the starting torque of the turbine, reaching a 135% increase compared to the base model.
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    Finite element analysis of SS316L-based five-hole plate implant for fibula reconstruction
    (Intellectual Research and Publication Foundation (Yayasan Riset dan Publikasi Intelektual), 2022-08-15) Qosim, Nanang; Emzain, Zakki Fuadi; Mufarrih, AM.; Monasari, Ratna; Kusumattaqiin, Fataa; Santoso, Rangga E.
    This study analyzed the design performance of SS316L-based plate implant for fibula restoration using a Finite Element Analysis approach. The simulated model design has dimensions of 35 x 5 x 1.5 mm and five holes with 2-3 configuration. The results of the bending test simulation showed that the values for both displacement and Von Mises stress that occurred (0.008 mm and 116 MPa of each) were still considerably below the yield stress of the SS316L material. The same results were also shown in the tensile test simulation, although the clamping setting on the plate was changed on the other side. From this finite element analysis approach, the SS316L-based five-hole plate implant design has a fairly good strength performance as a fibular bone-implant restoration product.