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Villafruela Espina, José Manuel Sierra Pallarés, José Benito Castro Ruiz, Francisco Álvaro Tordesillas, Antonio Santiago Casado, Pablo De 2018-11-29T12:00:49Z 2018-11-29T12:00:49Z 2018 Experimental Thermal and Fluid Science Volume 99, 2018, Pages 547-557 08941777 http://uvadoc.uva.es/handle/10324/33066 10.1016/j.expthermflusci.2018.08.021 547 557 Experimental Thermal and Fluid Science 99 When CFD is employed to design a ventilation system, one of the most delicate aspects is the modeling of the diffuser. The designer has different choices, which range from simulating the detailed geometry of the diffuser, including the plenum box, to use special boundary conditions to reproduce the velocity profile in each slot of the diffuser. This study is carried out to examine the influence of the plenum box on the turbulent airflow pattern generated by a swirl air diffuser from the experimental and numerical points of view. First, we perform experiments to evaluate such influence. Then, these experiments are contrasted with two numerical approximations to the problem using the Fluent 6.3.26 commercial CFD software. We first perform a simulation of the complete diffuser geometry – including the plenum box – and later a simplified simulation of the diffuser, where the whole geometry is simplified to a plane in which the velocity components and the slots positioning are specified via a particular boundary condition. The main findings of this study reveal that the simplified simulation is good enough at close range, while in the remote flow field the differences between both approaches practically disappear. © 2018 Elsevier Inc. Project DPI2014-55357-C2-1-R from the Spanish National Government 2013–2016 R&D&I plan issued by the Ministry of Economy and Competiveness. This project is cofinanced by the European Regional Development Fund (ERDF). application/pdf eng Elsevier info:eu-repo/semantics/restrictedAccess Elsevier Ltd Thermal comfort Ventilation stratum ventilation Experimental and numerical study of the influence of the plenum box on the airflow pattern generated by a swirl air diffuser info:eu-repo/semantics/article https://www.sciencedirect.com/science/article/pii/S0894177718309014?via%3Dihub SI