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All Journal Transmisi Abdi Dosen : Jurnal Pengabdian Pada Masyarakat G-Tech : Jurnal Teknologi Terapan Advance Sustainable Science, Engineering and Technology (ASSET)
Enos Tambing
Universitas Cenderawasih
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Uncertainty-Quantified Grid-Convergence Analysis of RANS Turbulence Models for 2-D Incompressible Backward-Facing Step Flow in OpenFOAM Kaiway, Mickael Ruben; Joni; Giai, Agustinus; Siregar, Samuel Parlindungan; Tambing, Enos; Pius, Obia
Advance Sustainable Science Engineering and Technology Vol. 8 No. 1 (2026): November - January
Publisher : Science and Technology Research Centre Universitas PGRI Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26877/asset.v8i1.2390

Abstract

A concise evaluation of Reynolds-Averaged Navier–Stokes (RANS) turbulence modeling for two-dimensional, incompressible, steady backward-facing step (BFS) flow at Re = 1000–3000 was conducted using OpenFOAM’s SimpleFoam solver with the standard k–ε model. A tri-level mesh enhancement (coarse, medium and fine) was implemented, and ambiguity was measured utilizing the Convergence Ratio (CR) and Grid Convergence Index (GCI). The fine grid (CR = 0.54; GCI = 0.0059%) was the only configuration exhibiting monotonic convergence, ensuring valid GCI estimation. Results showed reattachment length increasing from 0.11 m to 0.12 m, with stronger vortical structures and steeper shear gradients at higher Re. This study uniquely integrates RANS model validation with grid-uncertainty quantification, providing guidance for mesh optimization and reliable turbulence modeling in BFS simulations.
Co-Authors A. Wanaputra, Amadion Abda Abda Agustinus Agustinus Agustinus Agustinus Agustinus Giai Allo Sarira Pongsapan Allo, Elisabet Payung Allo, Elisabeth Payung David Mangallo Joni Lapituley, Frank Mangalo, David Mangopo, Dultudes Membala, Semuel Boron Mickael Ruben Kaiway Oktavianus Kati Payung Allo, Elisabeth Pither Palamba Pius, Obia Ranteallo, Obet Rombe Allo Rombe Allo Samuel Parlindungan Siregar Selyus Rantepulung Thomas Pagasis Tosuli, Yohanis Tangke Werdhani, Anastasia Sri Yakobus Kariongan