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Universitas Cenderawasih
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Journal : Advance Sustainable Science, Engineering and Technology (ASSET)

 1 
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 Abda Abda Agustinus Agustinus Agustinus Agustinus Agustinus Agustinus Giai AKBAR SILO Allo Sarira Pongsapan Allo, Elisabet Payung Allo, Elisabeth Payung Allo, Obed Rante Anastasia Sri Werdhani Anastasya S. Werdhani Anne Sihombing Arifia Ekayuliana Armansyah Halomoan Tambunan Banda, Dionisius Desriadi Bernathius Julison David Mangallo Eka Lambda Irianto, Eka Lambda Ekayuliana, Arifia Endang Hartiningsih Enos Karapa Enos Tambing Griapon, Nourish Griapon, Nourish C. Hartiningsi, Endang Haurissa, Calvion Jean Haurissa, Jusuf Herbert Innah Johni J Numberi Karapa, Enos Kiman Siregar Kiman Siregar, Kiman Lazarus B. Ramandey, Lazarus B. Lefaan, Yosef Lekito, Hanro Manalu, Janviter Mangalo, David Mangopo, Dultudes Marpaung, Johana Marthen Liga Matius R. Manalu Membala, Semuel Boron Mickael Ruben Kaiway Mohammad Arafah Mollet, Julius Ary Oktaviani, Theresia W. Oktavianus Kati Palamba, Phiter Pither Palamba Pither Palamba Pither Palamba Pius, Obia Prihananto Setiadji Radite Praeko Agus Setiawan Ranteallo, Obet Rombe Allo Rumar, Kristofel Rustam Efendi Safanpo, Apolo Samson Fernando Weyai Samuel Parlindungan Siregar Sebayang, Renaldi Selyus Rantepulung Setiadji, Prihananto Siregar, Januar Parlaungan Sri Werdhani, Anastasia Suparno Syilius Rantepulung Tendinus Werenengga Theresia W. Oktaviani Thomas Pagasis Tiper K. M. Uniplaita Tosuli, Yohanis Tangke Uniplaita, Tiper Uniplaita, Tiper Korneles Muwarberto Wambrauw, Oscar O. Wanane, Wilfriedf Werdani, Anastasia Sri Werdhani, Anastasia Sri Yakobus Kariongan Yane Oktovina Ansanay Yohanis Wanane