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All Journal Indonesian Mining Journal Jurnal Mineral, Energi dan Lingkungan Indonesian Mining Journal
Haq, Shofa Rijalul
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Chemical Engineering, Chemistry & Bioengineering Chemistry Earth & Planetary Sciences Energy Engineering Environmental Science Materials Science & Nanotechnology

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Karakteristik Batubara Formasi Warukin di Kalimantan Selatan serta Implikasinya pada Teknologi Pencairan Batubara Nursanto, Edy; Haq, Shofa Rijalul; Ardian, Aldin
Jurnal Mineral, Energi dan Lingkungan Vol 7 No 2 (2023): Jurnal Mineral Energi dan Lingkungan Volume 7 No. 2 Tahun 2023
Publisher : Universitas Pembangunan Nasional (UPN)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/jmel.v7i2.11075

Abstract

Batubara di Indonesia didominasi oleh peringkat rendah (low rank coal) prosentase lebih dari 85% dari total cadangan batubara. Meskipun demikian, batubara peringkat rendah lebih mudah diolah untuk meningkatkan nilai tambahnya karena struktur molekul dan gugus hidroksil batubara peringkat rendah yang reaktif dibandingkan dengan batubara peringkat tinggi. Penelitian ini bertujuan untuk mengkaji karakteristik batubara peringkat rendah formasi Warukin pada proses pencairan batubara. Data primer berupa pengambilan sampel batubara dan arah kedudukannya serta kemiringannya diperoleh dengan metode pengambilan ply by ply. Analisis proksimat, ultimat, maseral dan reflektan vitrinit dilakukan pada sampel-sampel tersebut dengan variasi pengujian, kemudian diolah dengan analisis secara teoritis empiris yang disajikan dalam bentuk tabel. Analisis data dilakukan berdasarkan hasil pengujian di laboratorium secara deskriptif kualitatif.  Dengan penelitian ini, sebaran sifat dan kualitas batubara dapat dievaluasi, serta alternatif teknologi penambangan dengan pencairan dapat direncanakan secara efektif dan efisien dengan penciri maseral liptinit mempunyai persentasi besar, yaitu rata-rata 34,28 % pada lapisan.
PERBANDINGAN HASIL ANALISIS POLA ALIRAN DENGAN PERSAMAAN RANS DAN LES DALAM COMPUTATIONAL FLUID DYNAMICS (CFD): LITERATURE RIVIEW Thiansy, Elsy; Cahyadi, Tedy Agung; Haq, Shofa Rijalul
Indonesian Mining Journal Vol 28 No 2 (2025): Indonesian Mining Journal, October 2025
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol28.No2.2025.1664

Abstract

The settling pond functions to hold and settle suspended particles, especially Total Suspended Solid (TSS) in order to reduce the pollutant load. However, the effectiveness of settling ponds is greatly influenced by the flow characteristics and the concentration of tss carried. This research compares two numerical approaches in Computational Fluid Dynamics (CFD), namely Reynolds-Averaged Navier-Stokes (RANS) and Large Eddy Simulation (LES). Both of these methods are widely used in turbulent flow simulations, but have different approaches and levels of accuracy in representing turbulence structures. This study reviews various recent scientific publications that apply the rans and les equations in internal and external flow cases, including settling pond applications. The review results show that the RANS equation is suitable for large-scale engineering simulations with low computational requirements but is less accurate in capturing turbulence details. The les equation provides more accurate results in capturing turbulent flow patterns than the RANS model. However, tutoring models require greater computational resources, so they need to be considered for more complex applications. From this comparison it can be concluded that the selection of equations in a CFD is very dependent on the analysis objectives, limited computing resources, and the level of data detail required.
PERBANDINGAN HASIL ANALISIS POLA ALIRAN DENGAN PERSAMAAN RANS DAN LES DALAM COMPUTATIONAL FLUID DYNAMICS (CFD): LITERATURE RIVIEW Thiansy, Elsy; Cahyadi, Tedy Agung; Haq, Shofa Rijalul
Indonesian Mining Journal Vol 28 No 2 (2025): Indonesian Mining Journal, October 2025
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol28.No2.2025.1664

Abstract

The settling pond functions to hold and settle suspended particles, especially Total Suspended Solid (TSS) in order to reduce the pollutant load. However, the effectiveness of settling ponds is greatly influenced by the flow characteristics and the concentration of tss carried. This research compares two numerical approaches in Computational Fluid Dynamics (CFD), namely Reynolds-Averaged Navier-Stokes (RANS) and Large Eddy Simulation (LES). Both of these methods are widely used in turbulent flow simulations, but have different approaches and levels of accuracy in representing turbulence structures. This study reviews various recent scientific publications that apply the rans and les equations in internal and external flow cases, including settling pond applications. The review results show that the RANS equation is suitable for large-scale engineering simulations with low computational requirements but is less accurate in capturing turbulence details. The les equation provides more accurate results in capturing turbulent flow patterns than the RANS model. However, tutoring models require greater computational resources, so they need to be considered for more complex applications. From this comparison it can be concluded that the selection of equations in a CFD is very dependent on the analysis objectives, limited computing resources, and the level of data detail required.
Co-Authors aldin ardian, aldin Cahyadi, Tedy Agung Edy Nursanto Thiansy, Elsy