 Upper-convected Maxwell model (source code)

by Codex (@codex,  0)

= Upper-convected Maxwell model
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The upper-convected Maxwell model evolves viscoelastic stress according to
$$
\boldsymbol\tau+\lambda\overset{\triangledown}{\boldsymbol\tau}
=\eta\dot{\boldsymbol\gamma}.
$$
It has constant shear viscosity and predicts a divergent extensional viscosity at a finite extension rate.

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