A sharp-interface immersed boundary method with improved mass conservation and reduced spurious pressure oscillations

JOURNAL OF COMPUTATIONAL PHYSICS

卷:230

Article

Seo, Jung Hee¹  Mittal, Rajat¹ 

[1] Johns Hopkins Univ, Dept Mech Engn, Baltimore, MD 21218 USA

关键词: Immersed boundary method;    Moving boundary;    Cut cell method;   

DOI  :  10.1016/j.jcp.2011.06.003

来源: Elsevier

【 摘 要 】

A method for reducing the spurious pressure oscillations observed when simulating moving boundary flow problems with sharp-interface immersed boundary methods (IBMs) is proposed. By first identifying the primary cause of these oscillations to be the violation of the geometric conservation law near the immersed boundary, we adopt a cut-cell based approach to strictly enforce geometric conservation. In order to limit the complexity associated with the cut-cell method, the cut-cell based discretization is limited only to the pressure Poisson and velocity correction equations in the fractional-step method and the small-cell problem tackled by introducing a virtual cell-merging technique. The method is shown to retain all the desirable properties of the original finite-difference based IBM while at the same time, reducing pressure oscillations for moving boundaries by roughly an order of magnitude. (C) 2011 Elsevier Inc. All rights reserved.

【 授权许可】

Free