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All Journal JURUTERA (Jurnal Umum Teknik Terapan) Jurnal Kolaborasi Sains dan Ilmu Terapan Advance Sustainable Science, Engineering and Technology (ASSET)
Hisyam Ma’mun
Universitas Persatuan Guru Republik Indonesia Semarang
Aerospace Engineering Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Mechanical Engineering

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Studi Numerik Optimasi Analisis Aerodinamika dengan Memvariasikan Jumlah Grid dan kecepatan Thatip Nur Khafid; Hisyam Ma’mun; Muhammad Syafii
Jurnal Kolaborasi Sains dan Ilmu Terapan Vol. 4 No. 2 (2026): Edisi Januari- Juni
Publisher : Utiliti Project Solution

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Abstract

Penelitian ini menganalisis karakteristik aerodinamika bus menggunakan simulasi Computational Fluid Dynamics (CFD) melalui variasi jumlah grid dan variasi kecepatan aliran. Uji independensi grid dilakukan pada kecepatan 100 km/jam dengan jumlah grid 500.000, 1.000.000, 1.500.000, dan 2.000.000 sel untuk mengevaluasi kestabilan koefisien aerodinamika. Hasil uji menunjukkan koefisien drag (Cd) menurun dari 0,943 pada grid 500 menjadi 0,743 pada grid 2.000.000, sedangkan koefisien lift (Cl) relatif stabil pada rentang 0,118–0,127, sehingga grid 2.000.000 dipilih untuk simulasi lanjutan. Validasi numerik terhadap data eksperimen pada variasi kecepatan 100–140 km/jam menunjukkan Cd numerik berada pada rentang 0,703–0,743, sementara Cd eksperimen berada pada rentang 0,608–0,664. Nilai Cl numerik berada pada rentang 0,121–0,127, sedangkan Cl eksperimen berada pada rentang 0,107–0,112. Secara umum, hasil simulasi menghasilkan Cd dan Cl yang cenderung lebih tinggi dibanding eksperimen, namun deviasinya relatif konsisten pada seluruh variasi kecepatan, sehingga model CFD dapat digunakan untuk analisis kecenderungan aerodinamika bus.
Numerical Study of the Thermal Performance of a Food Retort Machine Considering Grid Resolution and Operating Temperature Ridho Ardiansyah; Hisyam Ma’mun; Muhamad Safi’i
JURUTERA - Jurnal Umum Teknik Terapan Vol 13 No 01 (2026)
Publisher : Fakultas Teknik Universitas Samudra

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55377/jurutera.v13i01.14532

Abstract

Thermal sterilization processes in the food industry require uniform heat distribution so that the microbiological safety of products can be achieved without causing excessive energy consumption. A retort machine is one of the sterilization technologies widely used because it can extend the shelf life of packaged food products. This study aims to numerically evaluate the thermal performance of a retort machine by considering the effects of grid number and operating temperature on temperature distribution, pressure, and heat transfer coefficient. The benefit of this study is to provide a technical basis for selecting the optimum grid and effective operating temperature to support an accurate, stable, and efficient sterilization process. The significance of this study lies in the need of the food industry for a thermal analysis method that can reduce dependence on direct experiments, which require substantial cost, time, and resources. The method used in this study is Computational Fluid Dynamics (CFD) simulation with the realizable k-ε turbulence model, grid variations ranging from 1,145,681 to 4,027,933 elements, a flow velocity of 2 m/s, and inlet temperature variations of 115°C, 117°C, 121°C, and 123°C. The results show that the grid with 3,063,355 elements is the optimum grid because the temperature change compared to the higher grid is not significant. An increase in inlet temperature also increases the surface temperature and heat transfer coefficient. The operating temperature of 121°C showed stable and effective thermal performance based on the CFD simulation results, so it can be considered an initial recommendation in optimizing the thermal performance of the retort. However, its application on an industrial scale still requires further study of the F0 value, sterilization time, product quality, and energy consumption.
Experimental Analysis of Voltage and Multi-Point Temperature Distribution in a 6S Lithium-Ion Battery Pack Under Constant Current Loading Wildan Louise Fernando; Venugopal Thangavel; Hisyam Ma’mun
Advance Sustainable Science Engineering and Technology Vol. 8 No. 2 (2026): February-April
Publisher : Science and Technology Research Centre Universitas PGRI Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26877/asset.v8i2.2751

Abstract

Lithium-ion batteries are widely utilized in energy storage applications; however, temperature non-uniformity remains a critical issue affecting performance, safety, and lifespan. This study presents an experimental investigation of the correlation between voltage and multi-point temperature distribution in a 6S lithium-ion battery pack under a constant ±5 A charge–discharge current. Temperature measurements were obtained from three sensor locations to capture spatial thermal variations during operation. The results reveal that the central cell consistently exhibited the highest temperature, reaching approximately 40 °C, while a maximum thermal gradient of 5.7 °C was observed across the pack. Furthermore, a positive correlation between current and temperature indicates uneven heat generation among cells. These findings provide direct experimental evidence of thermal asymmetry in multi-cell configurations and emphasize the importance of optimized sensor placement and enhanced thermal management strategies in Battery Management Systems (BMS).
Co-Authors Ridho Ardiansyah Safi'i, Muhamad Thatip Nur Khafid Venugopal Thangavel Wildan Louise Fernando