[aspect-devel] Question on Thermal Viscosity thresholds

[FELIPE ORELLANA ROVIROSA]

 Hi,

      Hope you guys are having a nice day.

       I am crafting and trying different models on a 3D convecting system,
and considering Temperature-dependent viscosity among other things.

       For the material model 'simple', the viscosity depends on
temperature as a negative exponential (a classic), but some
thresholds/bounds are imposed on it.

       According to Aspect manual 1.5.0, page 289; if the exponential is
out of the bounds [ 0.01 , 100 ], that part of the viscosity will assume
the user-defined threshold values given by (Tau min, Tau max). Later the
amplitude will be given by the scaling constant eta0.

       But, if a user chooses values for {Tau min, Tau max} different than
{0.01 , 100}, then discontinuities in viscosity will be produced over the
temperature range.

       The question is the following: are those limits 10^-2 < x < 10^2
only a handbook example?, or will those limits assume the user-specified
values of Taumin, Taumax?

warm regards,
Felipe
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