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This study investigates the impact of surface roughness on flow and flame dynamics in a premixed jet burner (PJB) operating under both isothermal-air and reacting hydrogen-fired conditions. Experimental measurements using Laser Doppler Anemometry (LDA) and OH* chemiluminescence were complemented by Computational Fluid Dynamics (CFD) simulations employing Reynolds-Averaged Navier\u2013Stokes (RANS) and Detached Eddy Simulation (DES) frameworks. Building upon existing equivalent sand-grain roughness (k\u209b) models, a novel correlation incorporating both measured roughness parameters and bulk flow velocity was developed to improve predictive accuracy for resolved boundary layers (y\n                    <jats:sup>+<\/jats:sup>\n                    \u2248 1), a regime in which k\n                    <jats:sub>s<\/jats:sub>\n                    <jats:sup>+<\/jats:sup>\n                    &gt; y\u207a is common and standard roughness-function formulations lose validity. The new correlation demonstrated strong agreement with experimental data in isothermal simulations. When extended to reacting hydrogen\u2013air flames, RANS simulations successfully reproduced roughness-induced flow redistribution and flame shortening, although DES tended to overpredict bluff-body effects and underperform under lean conditions. Overall, the proposed k\n                    <jats:sub>s<\/jats:sub>\n                    correlation, validated under isothermal conditions, provides a computationally efficient framework for modelling surface-roughness effects, and its extension to reacting hydrogen flames, particularly under RANS, offers a promising basis for future development toward additively manufactured gas turbine components.\n                  <\/jats:p>","DOI":"10.1007\/s10494-026-00799-z","type":"journal-article","created":{"date-parts":[[2026,10,6]],"date-time":"2026-10-06T09:29:56Z","timestamp":1791278996000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Novel Low-y\u207a Roughness Correlation for Hydrogen-Fired Jet Burners Validated Under Isothermal and Reacting Conditions"],"prefix":"10.1007","volume":"117","author":[{"ORCID":"https:\/\/orcid.org\/0009-0008-5736-4784","authenticated-orcid":false,"given":"Robin","family":"Vivoli","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Daniel","family":"Pugh","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Anthony","family":"Giles","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Burak","family":"Goktepe","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Tomas","family":"Davies","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Steven","family":"Morris","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2026,10,6]]},"reference":[{"key":"799_CR1","doi-asserted-by":"publisher","unstructured":"Al-Fahham, M., Hatem, F.A., Alsaegh, A.S., Medina, A.V., Bigot, S., Marsh, R.: Experimental study to enhance resistance for boundary layer flashback in swirl burners using microsurfaces. 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