POLYFLOW - What is the meaning of fieldnames such as S EVSS, D EVSS, D DEVSS, etc?


When inspecting the results of a viscoelastic simulation, several fields appear, whose names are like S_EVSS, D_EVSS, D_DEVSS, etc. What is their meaning ?
When the EVSS technique is used for solving the viscoelastic constitutive equation, the extra-stress tensor T is written as T = S + 2.eta.D, while the constitutive equation is rewritten accordingly. Hence there are two tensors: S and D. Since they are used within the context of the EVSS technique, they have been named S EVSS and D EVSS.
[See also: D. Rajagopalan, R.C. Armstrong and R.A. Brown, Finite element methods for calculation of steady viscoelastic flows using constitutive equations with a Newtonian viscosity, J. non-Newt. Fluid Mech., 36 (1990) 159-192 ]

When the DEVSS technique is used for solving the viscoelastic constitutive equation, the constitutive equation for the extra-stress tensor T is kept unchanged; only the momentum equation is modified: a viscous term expressed in terms of velocity gradient is added, while a counterpart expressed in terms of rate-of-deformation tensor is removed. A new tensor is thus calculated: the rate-of-deformation tensor. Within the context of the DEVSS technique, it has been named D EVSS.
[See also: R. Guénette and M. Fortin, A new mixed finite element method for computing viscoelastic flow, J. non-Newt. Fluid Mech., 60 (1995) 27-52 ]





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