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All Journal Makara Journal of Technology Journal Of Biology Education Research (JBER)
Harinaldi .
Department Of Mechanical Engineering, Faculty Of Engineering, Universitas Indonesia, Depok 16424, Indonesia
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Education Electrical & Electronics Engineering Engineering Environmental Science Immunology & microbiology 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.
Spatial Analysis of Fish Diversity, Evenness, and Dominance During the Seasonal Transition Period for Ecosystem Health Assessment Ainy, Noer Sarifah; Sjahfirdi, Luthfiralda; Patria, Mufti Petala; Harinaldi, Harinaldi; Mujadid, Iqbal
Journal Of Biology Education Research (JBER) Vol. 7 No. 1 (2026): JBER (Journal Of Biology Education Research), Vol.7 No.1 (2026)
Publisher : Program Studi Pendidikan Biologi FKIP Universitas Pakuan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55215/jber.v7i1.105

Abstract

Freshwater ecosystems, particularly small lakes, play a crucial role in maintaining biodiversity and supporting essential ecological functions, yet they are highly vulnerable to environmental disturbances. Small lakes are increasingly exposed to anthropogenic pressures such as land use change, nutrient enrichment, and declining water quality, making biological assessment essential for detecting ecosystem degradation. This study aimed to identify segment level patterns of fish diversity, evenness, and dominance during the seasonal transition period and to determine whether these patterns can distinguish relatively balanced ecological zones from priority stress zones for ecosystem management. An ecologically based quantitative descriptive approach was applied using spatial zoning of inlet, middle, and outlet segments. Fish assemblages were assessed using the Shannon–Wiener diversity index (H′), Evenness (E), and Simpson’s dominance index (D). The results revealed clear spatial variation in community structure among sampling segments. Some systems exhibited strong internal ecological gradients characterized by decreasing diversity and increasing dominance toward downstream segments, whereas others showed more transitional or relatively uniform patterns. Community composition analysis indicated assemblage compression and potential biotic homogenization driven by a limited number of dominant taxa. Exploratory analyses further suggested that higher alkalinity, hardness, and chlorine levels were associated with lower diversity and greater dominance. These findings demonstrate that fish community indices provide effective biological indicators of ecosystem condition and can support spatially targeted monitoring, conservation, and management of small freshwater ecosystems. The study also highlights the importance of incorporating spatially explicit community assessments into ecosystem health evaluation frameworks.
Co-Authors Ainy, Noer Sarifah 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 LUTHFIRALDA SJAHFIRDI Maymuchar, Maymuchar Mufti Petala Patria Mujadid, Iqbal Parker Stefan, Parker 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