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All Journal Jurnal Teknik Mesin Jurnal Teknik ITS IPTEK The Journal for Technology and Science Warta Ardhia : Jurnal Perhubungan Udara Journal of Energy, Mechanical, Material and Manufacturing Engineering APPROACH: Jurnal Teknologi Penerbangan Jurnal Penelitian Prosiding SNITP (Seminar Nasional Inovasi Teknologi Penerbangan) JMES: The International Journal of Mechanical Engineering and Sciences Mechanical Engineering for Society and Industry Jurnal Impresi Indonesia Journal of Social Research Jurnal Locus Penelitian dan Pengabdian Sewagati International Journal of Renewable Energy Development EduInovasi: Journal of Basic Educational Studies
Wawan Aries Widodo
Institut Teknologi Sepuluh Nopember
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Numerical Study of Characteristics Root Canal Irrigation using Open-Ended Needle Positive Pressure and Negative Pressure Method Fajar Dwi Yudanto; Wawan Aries Widodo; Suwarno Suwarno
JMES: The International Journal of Mechanical Engineering and Sciences Vol 4 No 1 (2020)
Publisher : LPPM, Institut Teknologi Sepuluh Nopember, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25807471.v4i1.7128

Abstract

This study aims to determine the characteristics of fluid flow through root canal irrigation using positive and negative pressure methods used CFD (Computational Fluid Dynamic) software by modeling root canals and needle insertion in the root canals. This modeling used a steady flow, an incompressible flow, and uniform flow at the inlet side, and the roughness of the root canal wall surface is neglected (smooth wall). The open-ended needle with different insertion lengths applied for each method with a flow rate of 0.2 mL/s or about 6.63 m/s and the Reynolds number is 1376 (Laminar). The fluid has 2.5% of NaOCl with the density of 1060 kg/m3 and 0.001 Pa.s of fluid viscosity. After considering factors such as velocity, dynamic pressure, and wall shear stress in both methods, a greater velocity value in the apical region is determined by using a positive pressure method. Meanwhile, the negative pressure method shows the ability to lift higher due to shear stress, which is more evenly distributed upwards. However, both methods are qualified for irrigation replacement in the apical region.
A Study on the Selection of Co? Source Scenarios for the Implementation of a Ccus-Eor Pilot Project Using the AHP-Topsis Method at Field-X Fridam Amruloh Baqarizky; Wawan Aries Widodo
Journal of Social Research Vol. 5 No. 8 (2026): Journal of Social Research
Publisher : International Journal Labs

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55324/josr.v5i8.3360

Abstract

Carbon Capture, Utilization, and Storage–Enhanced Oil Recovery (CCUS–EOR) is a strategic approach to increasing crude oil production while supporting carbon emission reduction efforts in the oil and gas industry. This research aimed to determine the most suitable CO? source scenario for the CCUS–EOR pilot project in Field X using the AHP and TOPSIS methods and to evaluate its technical and economic feasibility. AHP was applied to determine the weights of four main criteria: CO? quality and specifications, CO? reservoir and supply capacity, distance and transportation requirements, and operational risks. TOPSIS was then used to rank alternative CO? sources, and the results were validated through technical and economic evaluations. CO? quality and specifications emerged as the most dominant criterion, with a weight of 55.8%. Technically, the implementation of CCUS–EOR was considered feasible with the addition of supporting facilities, including compression systems, dehydration units, booster compressors, and pumping systems. The projected CO? injection capacity reached 106,966 tCO? per year and was estimated to increase oil production by 146,000 barrels per year. Economically, the project generated annual revenue of approximately USD 11.62 million, with a capital expenditure (CAPEX) of USD 12.63 million, annual operating expenditure (OPEX) of USD 1.77 million, and cumulative discounted cash flow of USD 4.45 million at the end of the second year. The project achieved an internal rate of return (IRR) of 35.5%, a discounted payback period of 1.45 years, and a net levelized cost of CO? (net LCO?) of ?USD 27.6. The results demonstrated that the CCUS–EOR pilot project was technically and economically feasible, with the potential to increase oil production, reduce carbon emissions, and minimize dependence on routine flaring.
Optimization air circulation in negative pressure closed-house poultry buildings: A study on evaporative cooling pad thickness and exhaust fan operating pattern Lillahulhaq, Zain; Widodo, Wawan Aries; Sutardi, Sutardi; Yone, Thearith
Mechanical Engineering for Society and Industry Vol. 5 No. 2 (2025)
Publisher : Universitas Muhammadiyah Magelang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31603/mesi.14096

Abstract

An optimal environment for raising poultry requires a cool, humid climate. Negative pressure air circulation is widely implemented in closed-house cages, combined with evaporative cooling pads (ECP). Fresh air cannot naturally pass through the ECP due to the porosity of the material. The characteristics of the ECP and the configuration of the exhaust fan operating pattern affect airflow distribution, including velocity, temperature, and relative humidity (RH) levels. This research simulated the effect of varying ECP thickness on airflow distribution inside a closed-house cage. The simulation was run under 3D steady-state conditions with ECP thicknesses of 100 mm, 150 mm, 200 mm, and 300 mm, respectively. The ECP was kept wet, resulting in incoming air with 60% humidity and a temperature of 27 °C. The study used the K-ω SST turbulence model and SIMPLE second-order discretization. The analysis also provides recommendations for optimal exhaust fan operation during summer and identified restricted area. Five different fan operating patterns were tested, combining a small exhaust fan with two large ones. This analysis based on several parameter which refers uncomfortable environment, including: velocity, temperature, RH levels, and pollutant gas concentration. Hazardous conditions were determined by the maximum values observed across 42 iso-surfaces spaced 1 meter apart along the x-axis. A thicker ECP resulted in a higher pressure drop, reducing temperature differences inside the cage and leading to a more uniform temperature distribution. The 100 mm ECP thickness, the thinnest ECP layers, lowered the temperature inside the closed-house cage. The study suggests that, during summer, operating one small exhaust fan and one large fan is optimal due to the reduced presence of hazardous areas inside the cage.
Studi Life Cycle Assessment (LCA) Pengaruh Variasi Persentase Biomassa dalam Skema Co-Firing pada PLTU Pelabuhan Ratu terhadap Dampak Lingkungan dan Emisi CO2 Syafrudin; Wawan Aries Widodo
Jurnal Locus Penelitian dan Pengabdian Vol. 5 No. 7 (2026): JURNAL LOCUS: Penelitian dan Pengabdian
Publisher : Riviera Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58344/locus.v5i7.6188

Abstract

Pembangkit Listrik Tenaga Uap (PLTU) berbahan bakar batubara masih mendominasi penyediaan listrik nasional sekaligus menjadi penyumbang utama emisi gas rumah kaca. Co-firing biomassa merupakan strategi transisi energi rendah karbon yang dapat diterapkan pada PLTU eksisting tanpa modifikasi besar. Penelitian ini mengevaluasi dampak lingkungan dan emisi CO2 dari variasi persentase co-firing sawdust pada PLTU Pelabuhan Ratu (3×350 MW) menggunakan metode Life Cycle Assessment (LCA) dengan batas sistem cradle-to-grave dan satuan fungsional 1 kWh listrik. Lima skenario dianalisis: baseline 100% batubara (S0) dan co-firing sawdust 5%, 10%, 15%, dan 20% berbasis energi (S1–S4). Pemodelan dilakukan dengan perangkat lunak openLCA 2.6.1 dan metode ReCiPe 2016 Midpoint (H) pada empat kategori dampak: Global Warming Potential (GWP100), Terrestrial Acidification, Particulate Matter Formation, dan Ozone Formation, dilengkapi indikator Nilai Ekonomi Karbon (NEK). Hasil menunjukkan seluruh kategori dampak menurun konsisten seiring naiknya persentase co-firing. Pada substitusi 20% (S4), GWP100 menurun 19,6% (dari 0,5983 menjadi 0,4809 kg CO2-eq/kWh), Terrestrial Acidification 41,0%, Particulate Matter Formation 37,1%, dan Ozone Formation 18,9% dibandingkan baseline. Tahap hulu batubara (cradle) menjadi hotspot dominan GWP100 (~74%). Seluruh skenario berada di bawah cap PTBAE-PU (1,011 ton CO2e/MWh) sehingga menghasilkan surplus karbon, dengan potensi pendapatan meningkat dari Rp12.381/MWh (S0) menjadi Rp15.902/MWh (S4). Co-firing sawdust hingga 20% terbukti layak secara lingkungan dan ekonomi sebagai strategi dekarbonisasi PLTU eksisting.
Co-Authors A. Grummy Wailanduw Adi Mochammad Isa’i Aisyah, Imaniar Fitri Akbar Masyian Makka Akbar, Aldiva Syawallad Andrew Jaya Nazar Anton Nugroho Aryawan, Wasis Dwi Bambang Juni Pitoyo Bambang Juni Pitoyo Bambang Junipitoyo Dhika Suryananda Drestanta Vidyasakti Wibowo Dwi Septyan Waluyo Eko Ariyanto Fahmi Fahreza Fajar Dwi Yudanto Fajar Dwi Yudanto Fernando, David Franciska Enstinita Puspita Fridam Amruloh Baqarizky Gunawan Sakti Gunawan Sakti Hafizah, Nivana Haposan Misaelman Sinaga Hendri Louis Herman Sasongko Heru Mirmanto Hutagalung, Sylvia Ilmi, Innastya Hafshah Irbatul Imaniar Fitri Aisyah Intan Pandang Prinda Sakti Kanda Wibisana Nirwana Kresna Adytia Putra Louis, Hendri Luthfi Hakim Mutiara Nuril Karomah Nur Ikhwan P. Indiyono Pitoyo, Bambang Juni Prabowo Prabowo Prana Jaya Pratista Hariyanto Pribadi, Teuku Muhammad Burhanissulthan Reiza, Muhammad Naufal Rida Aries Arifah Rifqi Amin Muhlis Rifqi Amin Muhlis Sakti, Gunawan Sambodo, Adi Aryndra Sampurno Saputra, I Nyoman Agus Adi Satryo Fadhian Shidqi Nugroho Satryo Fadhian Shidqi Nugroho Setyo Hariyadi Shabrina, Dhia Fairuz sobar ihsan, sobar Suhardjono Supriadi Supriadi Supriadi Supriadi Sutardi Sutardi Sutardi Sutardi Sutardi Suwarno Suwarno Suwarno Suwarno Syafrudin Syifa' Zain Salsabila Tiara Pradina Putri Titania Eriani Triyogi Yuwono Triyogi Yuwono Varien Janitra Nuralif Susanto Wiwid Suryono Wiwid Suryono Yone, Thearith Zain Lillahulhaq