Adaptive non-conformal mesh refinement and extended finite element method for viscous flow inside complex moving geometries
作者： A. Sarhangi Fard , M. A. Hulsen , H. E. H. Meijer , N. M. H. Famili , P. D. Anderson
DOI: 10.1002/FLD.2595
关键词: Cross section (physics) 、 Conformal map 、 Rigid body 、 Extended finite element method 、 Engineering 、 Lagrange multiplier 、 Field (physics) 、 Degrees of freedom (mechanics) 、 Geometry 、 Fictitious domain method
摘要: SUMMARY Two different techniques to analyze non-Newtonian viscous flow in complex geometries with internal moving parts and narrow gaps are compared. The first technique is a non-conforming mesh refinement approach based on the fictitious domain method (FDM), second one extended finite element (XFEM). uses fixed reference mesh, impose continuity across regions, constraints using Lagrangian multipliers used. size of elements locally high shear rate regions reduced increase accuracy. FDM shown have limitations; therefore, XFEM applied decouple fluid from rigid bodies. In XFEM, discontinuous field variables captured by virtual degrees freedom that serve as enrichment applying special integration over intersected elements. accuracy two methods demonstrated direct comparison results boundary-fitted two-dimensional cross section twin-screw extruder. Compared FDM, shows considerable improvement around body, especially gap regions. Copyright © 2011 John Wiley & Sons, Ltd.
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