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Elbatran, A. H.
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Aerospace Engineering Decision Sciences, Operations Research & Management Engineering Industrial & Manufacturing Engineering Mechanical Engineering

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Study of the Effect of Low Profile Vortex Generators on Ship Viscous Resistance Ahmed, Yasser M.; Elbatran, A. H.; Shabara, H. M.
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 3 No 1 (2014): Journal of Ocean, Mechanical and Aerospace -science and engineering- (JOMAse)
Publisher : International Society of Ocean, Mechanical and Aerospace -scientists and engineers- (ISOMAse)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36842/jomase.v3i1.519

Abstract

A study of the effect of the well-known aerodynamic device low profile vortex generators (VGs) on the viscous resistance of the DTMB 5415 ship hull form through the control of the ship boundary layer separation is performed using the finite volume code Ansys CFX. The tetrahedral unstructural grids have been used for meshing the different cases. Different types of VGs have been tested, but the study has forced on two main types of VGs. The effects of VGs on the ship viscous resistance and its components have been investigated for the different cases in this study, and comparisons between the various results have been made.
Wells Turbine for Wave Energy Conversion for Malaysian Ocean Ahmed, Yasser M.; Yaakob, O. B.; Elbatran, A. H.; Mazukee, U. J. A.
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 8 No 1 (2014): Journal of Ocean, Mechanical and Aerospace -science and engineering- (JOMAse)
Publisher : International Society of Ocean, Mechanical and Aerospace -scientists and engineers- (ISOMAse)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36842/jomase.v8i1.491

Abstract

Malaysia is surrounded by ocean, therefore Malaysia is a perfect candidate for harvesting ocean energy as electrical generator to distribute to main grid. Malaysian electrical generation still greatly influences by non-renewable energy and the electrical cost increase as the natural resource depleting. The only solution for this problem is to use renewable energy, due to geography of Malaysian land which surround by ocean; ocean energy is the best renewable energy for Malaysia. One method of converting this energy is to use Oscillating Water Column using wells turbine as converter from pneumatic energy to mechanical energy thus convert by generator to electrical energy. However, wave characteristic of Malaysian ocean make conversion of wave energy really difficult.Some parameter that affect the performance of wells turbine need to be changed, so the new geometry turbine can work effectively in Malaysian ocean of the poor ocean characteristics such as low wave high and low frequency. According to Malaysian wave data, the average wave height is from 0.5m to 1.5m with average wave frequency of 0.1 to 0.3Hz and wave period 3.34s to 10s.
Effect of Internal Grids Structure on the Numerical Prediction of the Free Surface Flow around Wigley Hull Form Ahmed, Yasser M.; Yaakob, O. B; Elbatran, A. H.; Abdel-Hamed, Mohamed Walid
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 19 No 1 (2015): Journal of Ocean, Mechanical and Aerospace -science and engineering- (JOMAse)
Publisher : International Society of Ocean, Mechanical and Aerospace -scientists and engineers- (ISOMAse)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36842/jomase.v19i1.449

Abstract

Two grids with different internal mesh structure have been used to predict the incompressible free surface flow around the Wigley hull form at Fr= 0.2 and 0.267. The finite volume RANSE code Ansys CFX, which using the two-phase Eulerian-Eulerian fluid approach has been used to perform the different numerical simulations. The Shear Stress Transport (SST) turbulence models have been used in the RANSE code. Ansys Meshing and ICEM CFD grid generators have been used to generate the two unstructured tetrahedral grids for this study. The results compare well with the available experimental data for the hull resistance at the two speeds. In addition, wave patterns, pressure contours and the time required for the numerical simulations of the grids have been compared in this study.
Co-Authors Abdel-Hamed, Mohamed Walid Ahmed, Yasser M. Mazukee, U. J. A. Shabara, H. M. Yaakob, O. B Yaakob, O. B.