Simulation of the two-fluid model on incompressible flow with Fractional Step method for both resolved and unresolved scale interfaces |
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| Institution: | 1. Centre Tecnològic de Transferència de Calor (CTTC), Universitat Politècnica de Catalunya (UPC), ETSEIAT, C. Colom 11, 08222 Terrassa, Barcelona, Spain;2. Termo Fluids S.L., Avinguda Jaquard 97 1-E, 08222 Terrassa, Barcelona, Spain;1. School of Electric Power Engineering, China University of Mining and Technology, Xuzhou 221116, China;2. Key Laboratory of Low-Grade Energy Utilization Technologies and Systems (Chongqing University), Ministry of Education of China, Chongqing University, Chongqing 400044, China;3. Low Carbon Energy Institute, China University of Mining and Technology, Xuzhou 221008, China;4. Guizhou Electric Power Test and Research Institute, Guiyang 550002, China;1. Department of Mathematics, Shanghai Jiao Tong University, Shanghai, 200240, China;2. School of Aeronautics and Astronautics, Shanghai Jiao Tong University, Shanghai, 200240, China;1. National Energy Technology Laboratory, Morgantown, WV 26507, USA;2. Leidos Research Support Team, Morgantown, WV 26507, USA |
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| Abstract: | In the present paper, the Fractional Step method usually used in single fluid flow is here extended and applied for the two-fluid model resolution using the finite volume discretization. The use of a projection method resolution instead of the usual pressure-correction method for multi-fluid flow, successfully avoids iteration processes. On the other hand, the main weakness of the two fluid model used for simulations of free surface flows, which is the numerical diffusion of the interface, is also solved by means of the conservative Level Set method (interface sharpening) (Strubelj et al., 2009). Moreover, the use of the algorithm proposed has allowed presenting different free-surface cases with or without Level Set implementation even under coarse meshes under a wide range of density ratios. Thus, the numerical results presented, numerically verified, experimentally validated and converged under high density ratios, shows the capability and reliability of this resolution method for both mixed and unmixed flows. |
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| Keywords: | Two-fluid model Free surface flow Interface sharpening Fractional Step method |
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