150020 20251017144647.0 doi 10.1016/j.compfluid.2012.08.024 sideral 79855 ART-2012-79855 eng Rezeau, Adeline (orcid)0000-0002-9310-7864 Numerical characterization of the aerodynamics in fixed-grate biomass burners 2012 Access copy available to the general public Unrestricted This paper investigates the numerical simulation of the aerodynamics of biomass burners operating in small-scale, fixed-grate technologies. The efficiency of these boilers is largely determined by the fluid patterns originated in the combustion chamber, as a consequence of the interaction of primary and secondary inlets. A set of CFD computations have been carried out for a case-study burner, seeking the comparison for the isothermal-flow solutions given by Reynolds Averaged Navier–Stokes equations (RANS) and by Unsteady RANS equations (URANS). The influence of both spatial and temporal discretization is discussed, using the Grid Convergence Index (GCI) based on Richardson extrapolation. The results indicate that RANS solutions are slightly more sensitive to grid parameters, while URANS solutions show a better convergence behavior. Validation has been reasonably achieved by comparing the URANS velocity profiles against experimental measurements. As a consequence, a mathematical tool is now available to support design modifications of the biomass burner, combining simplicity, reliability and economy. info:eu-repo/semantics/openAccess by-nc-nd https://creativecommons.org/licenses/by-nc-nd/4.0/deed.es 1.467 2012 MECHANICS 47 / 135 = 0.348 2012 Q2 T2 COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS 44 / 100 = 0.44 2012 Q2 T2 info:eu-repo/semantics/article info:eu-repo/semantics/acceptedVersion Ramírez, Juan A. Díez, Luis I. Royo, Javier Universidad de Zaragoza (orcid)0000-0003-4631-6994 5004 590 Universidad de Zaragoza Dpto. Ingeniería Mecánica Área Máquinas y Motores Térmi. 69, 30 (2012), 45-53 Comput. fluids Computers and Fluids 0045-7930 534410 http://zaguan.unizar.es/record/150020/files/texto_completo.pdf Postprint 1345786 http://zaguan.unizar.es/record/150020/files/texto_completo.jpg?subformat=icon icon Postprint oai:zaguan.unizar.es:150020 articulos driver 2025-10-17-14:34:52 ARTICLE