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| Authors: | Sanghun Choi Myung Hwan Cho Hyoung Gwon Choi Jung Yul Yoo |
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| Affiliation: | 1. Department of Mechanical and Industrial Engineering, University of Iowa, Iowa City, IA, USA;2. Samsung Techwin, R&D Center, Seongnam, Korea;3. Department of Mechanical/Automotive Engineering, Seoul National University of Science and Technology, Seoul, Korea;4. School of Mechanical and Aerospace Engineering, Seoul National University, Seoul, Korea |
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| Abstract: | An integrated finite element method (FEM) is proposed to simulate incompressible two‐phase flows with surface tension effects, and three different surface tension models are applied to the FEM to investigate spurious currents and temporal stability. A Q2Q1 element is adopted to solve the continuity and Navier–Stokes equations and a Q2‐iso‐Q1 to solve the level set equation. The integrated FEM solves pressure and velocity simultaneously in a strongly coupled manner; the level set function is reinitialized by adopting a direct approach using interfacial geometry information instead of solving a conventional hyperbolic‐type equation. In addition, a consistent continuum surface force (consistent CSF) model is utilized by employing the same basis function for both surface tension and pressure variables to damp out spurious currents and to estimate the accurate pressure distribution. The model is further represented as a semi‐implicit manner to improve temporal stability with an increased time step. In order to verify the accuracy and robustness of the code, the present method is applied to a few benchmark problems of the static bubble and rising bubble with large density and viscosity ratios. The Q2Q1‐integrated FEM coupled with the semi‐implicit consistent CSF demonstrates the significantly reduced spurious currents and improved temporal stability. The numerical results are in good qualitative and quantitative agreements with those of the existing studies. Copyright © 2015 John Wiley & Sons, Ltd. |
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| Keywords: | direct approach method finite element method level set method semi‐implicit consistent CSF (continuum surface force) model Surface tension |
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