Computational fluid dynamics complex rheology

Until this point we have considered only inelastic liquids in both the analytical and numerical treatments of polymer processing. The viscoelasticity of polymer melts sometimes plays a major role in the mechanics of processing behavior, and we take up this important issue in the next and subsequent chapters. Numerical problems are greatly compounded by the presence of fluid elasticity, but the overall approach is unchanged. We will return to the use of computational fluid dynamics with complex rheology after taking up the subject of viscoelasticity. 

A computationally more efficient approach to the modeling of polymer systems is the Dissipative Particle Dynamics (DPD) method, introduced by Hoogerbmgge and Koelman [84] to describe the dynamics and rheological properties of complex fluids,... 

Suen et al. [5] have reviewed recent developments in this field, and Kroger [6] has summarized in some detail work on micro- and mesoscopic models for the nonlinear rheological behavior of complex fluids, in particular those that cannot be solved by analytical methods. The calculation of the stresses arising in flow fields using molecular dynamics is a very intensive operation from a computational point of view. 

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