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On the stability and accuracy of fully coupled finite element techniques used to simulate the flow of differential viscoelastic fluids: A one‐dimensional model

 

作者: Vincent Legat,   Jean‐Marie Marchal,  

 

期刊: Journal of Rheology  (AIP Available online 1992)
卷期: Volume 36, issue 7  

页码: 1325-1348

 

ISSN:0148-6055

 

年代: 1992

 

DOI:10.1122/1.550265

 

出版商: The Society of Rheology

 

关键词: Viscoelastic fluids;Mixed methods;Finite element;Stability;Accuracy;Upwinding;Streamline integration;VISCOELASTICITY;FINITE ELEMENT METHOD;STABILITY;ACCURACY;ONE−DIMENSIONAL CALCULATIONS;STREAMLINES;NUMERICAL SOLUTION;CONVERGENCE

 

数据来源: AIP

 

摘要:

Mixed stress‐velocity‐pressure finite element techniques are frequently used to solve differential viscoelastic flow problems of the Maxwell (Oldroyd‐B) type. In the present paper, simplified models are introduced to analyze the stability and the accuracy of a class of methods used to solve differential viscoelastic problems. In particular, a one‐dimensional equation is presented which exhibits most of the difficulties of the coupled Maxwell flow problem but requires only a fraction of the CPU time. The performance of some formulations (EEME, EVSS, 4×4, 4×4 SU, 4×4 SUPG, MIX1, ... ) are analyzed on the basis of this equation. New numerical techniques which enhance both the stability and the accuracy of those mixed formulations are also presented. Those techniques are based on a combination of two streamline integration techniques, in such a way as to maintain the elliptic character to the coupled system.  

 

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