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All Journal ⁠International Journal of Sustainable Social Culture, Science Technology, Management, and Law Humanities ⁠International Journal of Asian Pacific Community Service
Putra Dwiantoko
Universitas Kristen Cipta Wacana
Religion Agriculture, Biological Sciences & Forestry Humanities Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Engineering Environmental Science Law, Crime, Criminology & Criminal Justice

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Parametric Analysis of Reynolds Number Effects on Wake Region Characteristics in LBM-Based Fluid Flow Simulations Aulia Rahman; Putra Dwiantoko; Novan Habiburrahman; Djarot Winoto; Ahmad Robittah; Reinaldo Evan Audrey
⁠International Journal of Sustainable Social Culture, Science Technology, Management, and Law Humanities Vol. 3 No. 1 (2026)
Publisher : Universitas Kristen Cipta Wacana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.71131/j7cd2273

Abstract

This study investigates the fundamental fluid dynamics of steady-state laminar flow past a circular cylinder using the Lattice Boltzmann Method (LBM) with a D2Q9 lattice arrangement. Developed using a vectorized Pythonic approach, the numerical solver employs the Bhatnagar-Gross-Krook (BGK) collision operator to resolve the mesoscopic particle distribution functions. The research focuses on the flow characteristics at low Reynolds numbers (Re) ranging from 20 to 70 to ensure stable convergence toward steady-state conditions. Results demonstrate that the LBM effectively captures critical hydrodynamic phenomena, including stagnation points, flow acceleration due to blockage effects, and the development of symmetric wake regions. Analysis reveals a linear correlation between increasing Reynolds numbers and the longitudinal elongation of the recirculation zone, confirming the solver's ability to maintain numerical stability and momentum conservation without the computational expense of conventional pressure-velocity coupling. These findings validate the use of open-source computational tools for rigorous fluid flow analysis and provide a robust dataset for future integration with multi-scale modeling and machine learning frameworks, such as Physics-Informed Neural Networks (PINNs).
The Effect of Adding Fennel Oil and Tartaric Acid on the Combustion Rate of CPKO Droplets Putra Dwiantoko; Aulia Rahman; Slamet; Asri Anjasari; Novan Habiburahman
⁠International Journal of Sustainable Social Culture, Science Technology, Management, and Law Humanities Vol. 3 No. 1 (2026)
Publisher : Universitas Kristen Cipta Wacana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.71131/my6hnd43

Abstract

This study examines the effect of combustion rate on CPKO (Crude Palm Kernel Oil) droplets with and without additives and catalysts, focusing on improving its combustion efficiency given that CPKO's primary component, palmitic acid (C16), inherently exhibits poor combustion characteristics. By incorporating fennel oil a bio-additive containing anethole with its conjugated cyclic structure capable of generating a magnetic field to weaken CPKO's molecular bonds and tartaric acid a highly electronegative catalyst that disrupts glycerol linkages the research demonstrates a significant enhancement in combustion rate, confirming the positive impact of these additives on CPKO's thermal decomposition.
Application of Modular Vertical Gardening Racks to Improve Vegetable Cultivation Skills among Urban Communities Novie Priyanti; Novan Habiburrahman; Aulia Rahman; Putra Dwiantoko
⁠International Journal of Asia Pacific Community Service Vol. 3 No. 1 (2026)
Publisher : Universitas Kristen Cipta Wacana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.71131/ymx68229

Abstract

Limited household land is one of the main constraints on vegetable cultivation in densely populated urban areas. This community service program aimed to introduce modular vertical gardening racks and improve the knowledge and practical skills of urban communities in cultivating short-cycle leafy vegetables. The program was conducted with residents of RT 007/RW 01, Bandulan, Sukun District, Malang City, in February 2026 and involved 30 participants. The activities consisted of a partner needs assessment, participatory rack fabrication, training in plant biology and cultivation techniques, installation, and four weeks of mentoring. The racks were designed using hollow-steel frames with bolted joints, three planting levels, and removable planting containers, allowing them to be easily assembled, relocated, maintained, and expanded according to the available space. Program outcomes were evaluated using pretest and posttest questionnaires, skill observation sheets, participant response questionnaires, and plant growth monitoring. The program produced eight modular vertical gardening racks equipped with 72 planting containers. The participants’ mean knowledge score increased from 56.3 on the pretest to 84.7 on the posttest. Furthermore, 86.7% of the participants achieved the competent category in rack assembly and vegetable cultivation. At the end of the monitoring period, the plant survival rate reached 93.1%, supported by appropriate growing-medium preparation, watering practices, and light management. The program demonstrates that an interdisciplinary approach integrating manufacturing engineering and plant biology can provide practical, affordable, and replicable urban agriculture technology. Continuous mentoring and evaluation over several planting cycles are recommended to strengthen community independence and ensure program sustainability.
Co-Authors Ahmad Robittah Asri Anjasari Aulia Rahman Djarot Winoto Novan Habiburahman Novan Habiburrahman Novie Priyanti Reinaldo Evan Audrey Slamet