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All Journal Journal of Economic, Bussines and Accounting (COSTING) Makara Journal of Technology
Budiarso Budiarso, Budiarso
Department of Mechanical Engineering, Faculty of Engineering, Universitas Indonesia, Depok 16424, Indonesia
Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Economics, Econometrics & Finance Electrical & Electronics Engineering Engineering Materials Science & Nanotechnology Mechanical Engineering

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Limiting Maximum Drag Reduction Asymptote for the Moment Coefficient of an Enclosed Rotating Disk with Fine Spiral Grooves Budiarso, Budiarso; Watanabe, Keizo; Ogata, Satoshi
Makara Journal of Technology Vol. 11, No. 2
Publisher : UI Scholars Hub

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Abstract

In this study, the limiting maximum drag reduction asymptote for the moment coefficient of an enclosed rotating disk with fine spiral grooves in turbulent flow region were obtained analytically. Analysis which were based on an assumption for a simple parabolic velocity distribution of turbulent pipe flow to represent relative tangential velocity, was carried out using momentum integral equations of the boundary layer. For a certain K- parameter the moment coefficient results agree well with experimental results for maximum drag reduction in an enclosed rotating disk with fine spiral grooves and drag reduction ratio approximately was 15 %. Additionally, the experimental results for drag reduction on a rotating disk can be explained well with the analytical results.
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.
SOFT SYSTEM METHODOLOGY (SSM) APPROACH TO ADDRESS ORGANIZATIONAL INEFFICIENCIES IN HUFF AND PUFF OPERATIONS Warsiyanto, Faizal Ardi; Sunitiyoso, Yos; Budiarso, Budiarso
Journal of Economic, Bussines and Accounting (COSTING) Vol. 8 No. 4 (2025): COSTING : Journal of Economic, Bussines and Accounting
Publisher : Institut Penelitian Matematika, Komputer, Keperawatan, Pendidikan dan Ekonomi (IPM2KPE)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31539/costing.v8i4.15552

Abstract

The success of maintaining production in heavy oil fields is highly dependent on the effectiveness of Huff and Puff operations. However, in practice, this effectiveness is often hampered by technical limitations, budget constraints, organizational incompatibilities, and administrative inefficiencies. This study highlights issues at PT Energi Mega Persada (EMP), where a lack of communication and coordination between the engineering team, field teams (production and well service), and support functions (finance, procurement, and SHE) creates significant operational barriers. Each function has different priorities engineering focuses on reservoir optimization, field teams on operational execution, and support functions on regulatory compliance and budgeting but there is no integrated mechanism to align these priorities. This research uses Soft Systems Methodology (SSM) as a managerial approach to analyze organizational dynamics and identify root causes from the perspective of various stakeholders. Through systemic mapping of inter-functional conflicts and barriers, SSM enables the development of an integrated strategy that integrates technical and managerial decisions. The analysis results show that operational success is not solely determined by technology, but also by cross-functional collaboration, adaptive leadership, and integration between corporate strategy and operational conditions in the field. The application of SSM helps EMP formulate a more efficient, responsive, and aligned coordination framework with long-term production goals.
Co-Authors Dendy Adanta Engkos Achmad Kosasih Engkos Kosasih Harinaldi . I Gusti Made Teryanto, I Gusti Made James Julian Keizo Watanabe, Keizo krypton, arius Lay Teryanto, I Gusti Made Fredy Naldo, Naldo Parker Stefan, Parker Revan Difitro, Revan Rustan Tarakka Sabar Pangihutan Simanungkalit Sabar Simanungkalit, Sabar Satoshi Ogata, Satoshi Satria, Hardika Warjito Warjito, Warjito Warsiyanto, Faizal Ardi Yos Sunitiyoso