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/*--------------------------------*- C++ -*----------------------------------*\
| ========= | |
| \\ / F ield | foam-extend: Open Source CFD |
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| \\ / O peration | Version: 4.1 |
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| \\ / A nd | Web: http://www.foam-extend.org |
| \\/ M anipulation | |
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#
#+TITLE: UCM model stabilization
#+AUTHORS: Fernandes, C., De Araujo, M.S.B., Ferrás, L.L., Nóbrega, J.M.
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This tutorial was prepared to illustrate the new stabilization approach for viscoelastic constitutive models proposed in:
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Fernandes, C., De Araujo, M.S.B., Ferras, L.L., Nobrega, J.M.,
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Improvements in the OpenFOAM numerical code for simulation of
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steady-state differential viscoelastic flows, 11th OpenFOAM Workshop
Guimarães, Portugal, June 26 - 30, 2016
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and
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De Araujo, M.S.B., Ferras, L.L.,Fernandes, C.,Nobrega, J.M.,
Improvements ans assessment of the integral viscoelastic solver in OpenFOAM, 11th OpenFOAM Workshop
Guimarães, Portugal, June 26 - 30, 2016
It comprises 2 case studies for the flow in a 4:1 abrupt contraction of an UCM viscoelastic fluid, for De=1
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- UCM_Orig - employs the original formulation that diverges before reaching the endtime
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- UCM_Stab - employs the new stabilized formulation that allows to achieve convergence for all time steps
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Notes
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(1) To use the new stabilized formulation the value of etaStab should be provided in "constant/viscoelasticProperties". If ommited the solver uses the original formulation
(2) Based on several studies performed, the value of etaStab should be similar to etaP
