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All Journal Makara Journal of Technology Prosiding SNTTM
Harinaldi .
Department Of Mechanical Engineering, Faculty Of Engineering, Universitas Indonesia, Depok 16424, Indonesia
Aerospace Engineering Agriculture, Biological Sciences & Forestry Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Electrical & Electronics Engineering Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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Modification of Flow Structure Over a Van Model By Suction Flow Control to Reduce Aerodynamics Drag Harinaldi, Harinaldi; Budiarso, Budiarso; Warjito, Warjito; Kosasih, Engkos Achmad; Tarakka, Rustan; Simanungkalit, Sabar Pangihutan; Lay Teryanto, I Gusti Made Fredy
Makara Journal of Technology Vol. 16, No. 1
Publisher : UI Scholars Hub

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Abstract

Automobile aerodynamic studies are typically undertaken to improve safety and increase fuel efficiency as well as to find new innovation in automobile technology to deal with the problem of energy crisis and global warming. Some car companies have the objective to develop control solutions that enable to reduce the aerodynamic drag of vehicle and significant modification progress is still possible by reducing the mass, rolling friction or aerodynamic drag. Some flow control method provides the possibility to modify the flow separation to reduce the development of the swirling structures around the vehicle. In this study, a family van is modeled with a modified form of Ahmed's body by changing the orientation of the flow from its original form (modified/reversed Ahmed body). This model is equipped with a suction on the rear side to comprehensively examine the pressure field modifications that occur. The investigation combines computational and experimental work. Computational approach used a commercial software with standard kepsilon flow turbulence model, and the objectives was to determine the characteristics of the flow field and aerodynamic drag reduction that occurred in the test model. Experimental approach used load cell in order to validate the aerodynamic drag reduction obtained by computational approach. The results show that the application of a suction in the rear part of the van model give the effect of reducing the wake and the vortex formation. Futhermore, aerodynamic drag reduction close to 13.86% for the computational approach and 16.32% for the experimental have been obtained.
Aerodynamic effect of windbreak on the crosswind phenomenon on a high-speed train Harinaldi, Harinaldi; Ramadhan, Naufal P
Prosiding SNTTM Vol 23 No 1 (2025): SNTTM XXIII October 2025
Publisher : BKS-TM Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.71452/xk93bt57

Abstract

Crosswind greatly affects the aerodynamic performance and operational safety of the high-speed train. Windbreak is one of the windproof facilities commonly used for high-speed trains in windy areas. This study aims to see how variations in windbreak height (3.8 m; 4.4 m; and 5.2 m) can affect the aerodynamic performance of high-speed trains. 3 aerodynamic coefficients (drag, lift, and rolling moment) of the HST were compared when the train passed the track under the same conditions using the ANSYS FLUENT CFD simulation. Sudden changes in aerodynamic loads can be seen from the visualization of the pressure contour. First, the aerodynamic coefficient of the train will decrease significantly when the train begins to enter the windbreak. Second, the ‘IN’ process of the windbreak track has a larger aerodynamic load fluctuation than the ‘OUT’ process. Third, the height of the windbreak does not significantly change the trend of the aerodynamic coefficient graph, there is only a phase difference and the magnitude of the amplitude formed. The highest average drag and lift coefficient occurs at a height of 5.2 m, which is 0.29 and 0.011. Meanwhile, the highest average rolling moment coefficient occurs at a windbreak height of 3.8 m, which is 0.0028
Co-Authors Budiarso Budiarso Budiarso Budiarso, Budiarso Caturwati, NK Christoforus Deberland Damora Rhakasywi Dhiputra, I Made K Engkos A. Kosasih, Engkos A. Engkos Achmad Kosasih Engkos Kosasih Engkos Kosasih I Gusti Made Teryanto I Gusti Made Teryanto, I Gusti Made James Julian Lay Teryanto, I Gusti Made Fredy Maymuchar, Maymuchar Parker Stefan, Parker Ramadhan, Naufal P Revan Difitro, Revan Rulianto, Dimitri Rustan Tarakka Rustan Tarakka Sabar Pangihutan Simanungkalit Sabar Simanungkalit Sabar Simanungkalit, Sabar Trisno Sri Suparyati Soenarto dan Dibyo Pramono Agung Wibowo Warjito Warjito Warjito Warjito, Warjito