On spurious velocities in incompressible flow problems with interfaces

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• 作者：Sashikumaar Ganesan ; Gunar Matthies ; Lutz Tobiska
• 关键词：Incompressible flow ; Two-phase flow ; Interface ; Finite elements
• 刊名：Computer Methods in Applied Mechanics and Engineering
• 出版年：2007
• 出版时间：10 January 2007
• 年：2007
• 卷：196
• 期：7
• 页码：1193-1202
• 全文大小：404 K

文摘

We show that a non-physical velocity may appear in the finite element calculation of incompressible two-phase flows subjected to an external local force. There are different sources responsible for this phenomenon: approximation of the incompressibility constraint, the interface, and the local external force. Furthermore, we demonstrate that this non-physical velocity does not vanish with the expected order of convergence. We evaluate different concepts and give recommendations for a proper handling of this phenomenon.