An asymptotic fitting finite element method with exponential mesh refinement for accurate computation of corner eddies in viscous flows

Alexander V. Shapeev, Ping Lin

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)
192 Downloads (Pure)

Abstract

It is well known that any viscous fluid flow near a corner consists of infinite series of eddies with decreasing size and intensity, unless the angle is larger than a certain critical angle[28]. The objective of the current work is to simulate such infinite series of eddies occurring in steady flows in domains with corners. The problem is approached by high-order finite element method with exponential mesh refinement near the corners, coupled with analytical asymptotics of the flow near the corners. Such approach allows one to compute position and intensity of the eddies near the corners in addition to the other main features of the flow. The method was tested on the problem of the lid-driven cavity flow as well as on the problem of the backward-facing step flow. The results of computations of the lid-driven cavity problem show that the proposed method computes the central eddy with accuracy comparable to the best of existing methods and is more accurate for computing the corner eddies than the existing methods. The results also indicate that the relative error of finding the eddies’ intensity and position decreases uniformly for all the eddies as the mesh
Original languageEnglish
Pages (from-to)1874-1900
Number of pages27
JournalSIAM Journal on Scientific Computing
Volume31
Issue number3
Early online date13 Mar 2009
DOIs
Publication statusPublished - 13 Mar 2009

Keywords

  • Moffatt eddies near sharp corners
  • Asymptotic expansion matching
  • Finite element method

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