Akay, Hasan UmurLiu, JingxinAkay, Hasan U.Ecer, AkinPayli, Resat U.Automotive Engineering2024-07-052024-07-05201061061-85621029-025710.1080/10618562.2010.521130https://doi.org/10.1080/10618562.2010.521130https://hdl.handle.net/20.500.14411/1456Akay, Hasan U/0000-0003-2574-9942In this article, a computational fluid dynamics algorithm is presented for simulations of complex unsteady flows around rigid moving bodies using an unstructured overset-grid method. For this purpose, a highly automated, three-dimensional, tetrahedral, unstructured overset-grid method is developed with one-cell-width overlapping zone in order to model the arbitrary geometries for steady and unsteady flow simulations. A method has been described to obtain the inter-grid boundaries of the one-cell-wide overlapping zone shared by a background grid and a minor grid. In the overset-grid methodology, vector intersection algorithm and bounding box techniques have been utilised. The mesh refinement and overset-scheme conservation studies proved the accuracy and efficiency of the method developed here. The applications of the developed algorithms were also performed through simulations that included complex internal flows around a flow-control butterfly valve as well as flows in an internal combustion engine with a moving piston. Lastly, validations with experimental data were conducted for both steady and unsteady flows around rigid bodies with relative motions.eninfo:eu-repo/semantics/closedAccessCFDunstructured gridoverset methodhole cuttingdonor cellunsteady flowmoving bodyArticleQ4Q3246187200WOS:000284002300001