Claim Missing Document
Check
Articles

Studi numerik aliran melalui struktur persegi dengan model turbulent Large Eddy Simulation (LES) Mohamad Abdirizal Bahmid; La Ode Ahmad Barata; Budiman Sudia
Piston: Jurnal Teknologi Vol 11 No 1 (2026): Juni 2026
Publisher : Program Pendidikan Vokasi Teknik Mesin

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55679/pistonjt.v11i1.137

Abstract

Perilaku aliran fluida yang melewati struktur berpotensi menimbulkan dampak buruk seperti memicu kebisingan, getaran, dan stabilitas struktur. Karenanya, analisis karakteristik alirannya menjadi penting dalam bidang rekayasa aerodinamika. Penelitian ini membahas studi numerik karakteristik aliran fluida yang melewati struktur persegi menggunakan metode Computational Fluid Dynamics (CFD) dengan model turbulen Large Eddy Simulation (LES). Simulasi dilakukan menggunakan ANSYS Fluent 17.2 dengan variasi sudut serang aliran α = 0° dan α = -30° pada bilangan Reynolds 10⁴. Analisis difokuskan pada distribusi kecepatan, tekanan, tegangan aliran, vortisitas, serta parameter aerodinamis berupa koefisien drag (CD), koefisien tekanan dasar (-CPb), dan bilangan Strouhal (St). Hasil simulasi menunjukkan bahwa perubahan sudut serang mempengaruhi karakteristik aliran secara signifikan. Pada α = 0°, pola aliran bersifat simetris dengan pembentukan vortex shedding yang stabil di daerah wake. Sedangkan pada α = -30°, medan aliran menjadi asimetris akibat pergeseran titik stagnasi dan separasi aliran yang menyebabkan peningkatan turbulensi dan pelebaran wake. Nilai koefisien drag meningkat dari 2.05 menjadi 2.34, sedangkan bilangan Strouhal menurun dari 0.128 menjadi 0.115. Distribusi tekanan dan tegangan menunjukkan peningkatan efek hisapan pada sisi hilir struktur yang berdampak pada kenaikan gaya hambat dan gaya angkat. Hasil validasi menunjukkan kesesuaian yang baik dengan penelitian numerik dan eksperimen sebelumnya. Dengan demikian, model LES mampu memberikan prediksi karakteristik aliran turbulen secara akurat pada struktur bluff body berbentuk persegi.
Rancang Bangun Kompresor Mini Kapasitas 3 kg sebagai Penggerak Air Impact Wrench untuk Aplikasi di Bengkel Otomotif Aminur; Sudarsono; Budiman Sudia; Raden Rinova Sisworo; Samhuddin
Piston: Jurnal Teknologi Vol 11 No 1 (2026): Juni 2026
Publisher : Program Pendidikan Vokasi Teknik Mesin

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55679/pistonjt.v11i1.133

Abstract

The use of pneumatic tools such as air impact wrenches in the workshop industry requires a stable and adequate supply of compressed air. However, conventional compressors on the market often have large dimensions, making them less flexible for portable needs. This study aims to design and build a mini compressor system capable of supplying the air pressure needed for the operation of an air impact wrench. The research method includes the system design stage, selecting the drive components (electric motors), calculating the dimensions of the air storage tank, and testing the system's performance. The parameters tested include the tank filling time to reach maximum working pressure, and pressure stability when the pneumatic tool is used. The results showed that the tank filling time is 10 minutes to reach a maximum working pressure of 95 Psi and the pneumatic tool pressure stability is 65 Psi within 3 minutes at a volume of 0.54 CFM. For heavier continuous use of the air impact wrench, a refill interval is required considering the limited pressure stability duration of 3 minutes..
DARI LISAN KE DIGITAL: PEMBERDAYAAN LABORATORIUM TEKNIK MESIN MELALUI PANDUAN OPERASIONAL BERBASIS QUICK RESPONSE CODES (QR CODES) DI UNIVERSITAS HALU OLEO Muhammad Idris Putra; Budiman Sudia; Prinob Aksar; Bahdin Ahad Badia; La Rahman; Muhammad Irwan Syahib; Citra Yurnidar Syah; Anita Yuliana
Jurnal Pengabdian Masyarakat Sabangka Vol 5 No 03 (2026): Jurnal Pengabdian Masyarakat Sabangka
Publisher : Pusat Studi Ekonomi, Publikasi Ilmiah dan Pengembangan SDM

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62668/sabangka.v5i03.2602

Abstract

Optimizing laboratory management is support safe and effective learning activities. In the Design and Machining Process Laboratory, Faculty of Engineering, equipment operation has largely depended on verbal instructions from laboratory staff, increasing the potential for operational errors & workplace accidents. This commu nity service program aimed to develop digital equipment operating manuals integrated QR Codes to improve users' independence in laboratory activities. A participatory approach was employed through needs assessment, equipment inventory, manual develop ent based on technical references and occupational health and safety standards, integration into QR Code-linked digital flip books, dissem ination, and evaluation. The results demonstrate that the digital manuals can be accessed instantly by scanning QR Codes attached to each piece of equipment, enabling students to obtain operational guidance independently. This innovation enhances the effectiveness of laboratory practice, minimizes equipment misuse, and promotes a stronger occupational safety culture, making it a practical and sustainable model for laboratory management in higher education
Co-Authors Abd Kadir, Abd Abd. Kadir Aditya Rachman Aditya Rachman Agusti, Tri Ahmad Rizky Rahmadhan Aksar, Prinob Al Ichlas Imran Aldy Jibriel Pane Ali Usman, Muh Aljaninansya, Rusdi Ambo Upe Aminur Aminur Aminur Aminur Aminur Andi Abdillah Andri, Muh. Anita Yuliana Anto, Herbianto Asar, Asar Asmin Asmin, Asmin Baehaqi Bahdin Ahad Badia Citra Yurnidar Syah Darwin Darwin Darwis, Mardis Defi, Sry Djalil, Muh. Afdal Dwi Saputra, Gusti Made Esparuling, Esparuling Faradila, Uswatun Feliks Eldad Larobu hanur, Hanur Hasanuddin, La Hasanudin, La I Dewa Gde Mayun Permana Idris Idris Imran, Al Ichlas Imran, Nur Al Inaswara, Fadhilla Indarwan Iqwal, La Ode Jaka Seru Dwi Saputra Jenny Delly Juardin, Juardin Kadir Kadir Kadir Kadir Kadir, Abd . La Hasanudin La Ode Ahmad Barata La Rahman Laksono Trisnantoro Laode Abdul Gamsir Lukas Kano Mangalla, Lukas Kano Lukman, Muh Rahmat M, Saiful . Mohamad Abdirizal Bahmid Muhammad Faisal Muhammad Hasbi MUHAMMAD HASBI Muhammad Irwan Syahib Muslimin Muslimin Nanang Endriatno Nanang Endriatno Paksi, Pegi Satria Eka Putra, Muhammad Idris R.Y.P, Lalu Junaedi Raden Rinova Sisworo Raden Rinova Sisworo Rasmin, Rasyid Ridway Balaka, Ridway Rustam Efendi Said, Harman Salimin Salimin Salimin Salimin Salimin Salimin, Salimin Samhuddin Samhuddin Samhuddin Samhuddin Samhuddin Samhuddin Samhuddin Samhuddin Samhuddin Samhuddin, Samhuddin Saputra, I Nyoman Ardika Saputro, Bagus Andi Sarif, La Sastal, Angga Zeptiawan Sigit Santoso Simatupang, Minson Sisa, Arsin Sudarsono Sudarsono Sudarsono Sudarsono Supriadi Wardana, Muh. Azim Panca Yurnidarsyah, Citra Yurnidasyah, Citra