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Numerical study of Taylor bubbles rising in a stagnant liquid using a level-set/moving-mesh method Gutiérrez González, Ernesto Balcázar Arciniega, Néstor Bartrons Casademont, Eduard Rigola Serrano, Joaquim Universitat Politècnica de Catalunya. Departament de Màquines i Motors Tèrmics Universitat Politècnica de Catalunya. CREMIT - Centre de Recerca de Motors i Instal·lacions Tèrmiques Universitat Politècnica de Catalunya. CTTC - Centre Tecnològic de la Transferència de Calor Àrees temàtiques de la UPC::Enginyeria mecànica::Mecànica de fluids Àrees temàtiques de la UPC::Matemàtiques i estadística::Anàlisi numèrica Fluid mechanics Numerical analysis Taylor bubble Arbitrary Lagrangian-Eulerian formulation Level set method Open boundary condition Multiphase flow Unstructured meshes Mecànica de fluids Anàlisi numèrica An Arbitrary Lagrangian-Eulerian formulation has been posed to solve the challenging problem of the three-dimensional Taylor bubble, within a Conservative Level Set (CLS) framework. By employing a domain optimization method (i.e. the moving mesh method), smaller domains can be used to simulate rising bubbles, thus saving computational resources. As the method requires the use of open boundaries, a careful treatment of both inflow and outflow boundary conditions has been carried out. The coupled CLS - moving mesh method has been verified by means of extensive numerical tests. The challenging problem of the full three-dimensional Taylor bubble has then been thoroughly addressed, providing a detailed description of its features. The study also includes a sensitivity analyses with respect to the initial shape of the bubble, the initial volume of the bubble, the flow regime and the inclination of the channel. Postprint (author's final draft) 2017-06-08 Article Gutierrez, E., Balcazar, N., Bartrons, E., Rigola, J. Numerical study of Taylor bubbles rising in a stagnant liquid using a level-set/moving-mesh method. "Chemical engineering science", 8 Juny 2017, vol. 164, p. 158-177. 0009-2509 https://hdl.handle.net/2117/105970 10.1016/j.ces.2017.02.018 eng http://www.sciencedirect.com/science/article/pii/S0009250917301264 http://creativecommons.org/licenses/by-nc-nd/3.0/es/ Open Access Attribution-NonCommercial-NoDerivs 3.0 Spain 20 p. application/pdf