POLYFLOW - zero pivot for LMI000... variable at the inlet

The user defines a flow with the light viscoelastic model (ScaFTen), where the relaxatio ntime is constant. The calculation stops during the first iteration of the first step for the evaluation of the inlet boudary conditions, with a zero pivot for the varialbe LMI000...
A remedy consists of defining a variable relaxation time (Bird-Carreau law) with a power index of 1.

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