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All Journal JURUTERA (Jurnal Umum Teknik Terapan)
Banta Cut
Universitas Samudra
Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Engineering Mechanical Engineering

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Numerical Simulation of Two Circular Cylinders Arranged In-line in a Narrow Channel with a Reynolds Number of 1.0x10^5 Zulfikar; Banta Cut; Suheri
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.v13i01.13616

Abstract

The flow of fluid around the circular cylinder (bluff body) is a fundamental problem in engineering with a wide range of applications, such as in offshore buffer pipes and chimneys. A common phenomenon is the emergence of drag forces, elevator forces, and vortex shedding. This study aims to reduce drag and lift forces in the arrangement of two circular cylinders arranged in line in narrow channels. The variation in the distance between cylinders was tested at T/D = 2.0, 2.5, 3.0, and 4.0 ratios (cylinder diameter D = 25 mm). Reduction efforts are made by placing the disruptor body (d=4) at an angle (0°, 120°, 240°) around the perimeter of the array. Numerical simulation was performed using the 2D unsteady RANS method with Ansys Student Fluent® 2021 software and the turbulence model (K-ω SST) at Reynolds numbers (Re = 1.0x10⁵) in cross-sectional channels (H = 300 mm, L = 150 mm). The results showed that at the T/D = 4.0 ratio, the wake interaction between the two cylinders was no longer dominant. The addition of a disruptor body at an angle (0°, 120°, 240°) has also been shown to be very effective in reducing the drag coefficient (CD) of both cylinders. The CD value in cylinder 1 without a disruptor body is 0.762 and with a disruptor body reaches 1.148 (reduction: [percentage with disruptor body Cyl 1]), while in cylinder 2, CD without a disruptor body is 0.762 and with a disruptor body, it reaches 1.148 (reduction: [percentage with disruptor body Cyl 2]). There are contradictions in the results data. The reduced CD values (1.148 and 1.148) were actually higher than the CD values without the disruptor body of 0.762 and 0.762, although the text states that there is a reduction and that it is very effective.
Numerical Study of Flow Characteristics Across Circular Cylinders and Sliced Cylinders of Type-D and Type-I Near Flat Walls Muhammad Azhari; Banta Cut; Nasruddin A. Abdullah
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.v13i01.13819

Abstract

Numerical simulations using the Ansys Fluent 2025 R2 CFD solver were conducted to investigate the unsteady and incompressible fluid flow characteristics around circular, D-type, and I-type cylinders positioned near a flat wall. The modified geometries for the D-type and I-type cylinders featured a cutting angle of 65°. This study evaluates the flow dynamics across various gap ratios (G/D) between the cylinders and the flat wall, specifically 0.05, 0.0833, and 0.1167. All simulations were performed at a Reynolds number (Re) of 5.3 using the k-SST turbulence model. The results indicate that decreasing the gap ratio triggers a significant blockage effect, characterized by flow acceleration (jetting) within the lower gap area. Qualitatively, increasing the G/D ratio is shown to delay flow separation and narrow the wake region. Visualizations of velocity and vorticity magnitude confirm that the interaction between the wall boundary layer and the cylinder's shear layer at small gaps inhibits organized vortex formation, although flow stability improves as the gap distance increases.
Analysis of aBiomass-fueled Fish Dryer with a Microcontroller Based Blower System Iskandar; Banta Cut; Bambang Nurcipto; Rahmad Bahri
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.v13i01.13893

Abstract

This study analyzes the performance of a biomass-fueled fish dryer equipped with a blower and an automatic control system based on an Arduino Mega 2560 microcontroller. The system consists of a combustion chamber, a drum-shaped drying chamber, a blower, a type-K temperature sensor, and a MAX6675 module controlled via a solid-state relay (SSR). Tests were conducted under no-load and load conditions using milkfish. The results showed average drying temperatures of 78.76 °C and 64.1 °C, with drying rates of 74.2 g/h and 70.6 g/h, respectively. The final moisture contents were 19.1% and 19.4%. The temperature control system operated stably without overshoot and effectively regulated the blower. Heat transfer efficiency reached 64.48% and increased to 70.26%, while the overall thermal efficiency was 3.12% due to the open system design without insulation. Coconut shell biomass proved to be an economical and more sustainable energy source.
Co-Authors Bambang Nurcipto Muhammad Azhari Nasruddin A. Abdullah Rahmad Bahri Suheri - Suheri Yakob Iskandar Zulfikar