4:1急縮小流れの粘弾性流動解析(S23-3 複雑流体の流れとその応用(3),S23 複雑流体の流れとその応用)

概要

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The singular/decoupled finite element method (SFEM), which is enable to yield more smoothed results especially near the die-lip (singularity) than the ordinary FEM for solving the die-swell flow problems of viscoelastic fluids, have been applied to 4:1 axisymmetric sudden contraction flows of unit mode Giesekus model fluids for the purpose of testing an enhancement capability of SFEM to the other problem, and comparing our FEM / SFEM results with experimental data reported by Byars et al^<1)>. When substituting the extra stress into momentum equation, following two schemes are adopted: the rearranged substitution method (RS) and the direct substitution method (DS). At this moment, the simulations for FEM-RS, FEM-DS and SFEM-RS are successful. It is found that for the problems containing singularity, slight difference can be seen between RS and DS, i.e., the size of circular region obtained with RS-FEM and RS-SFEM are greater than those calculated with DS and the experimental results.
社団法人日本機械学会の論文
2004-09-04