[Nek5000-users] variable viscosity formulation
nek5000-users at lists.mcs.anl.gov
nek5000-users at lists.mcs.anl.gov
Wed Oct 25 14:30:22 CDT 2017
It means that the viscosity coefficient for the velocity field is negative. What is the expression for your viscosity coefficient?
> On Oct 25, 2017, at 3:23 PM, nek5000-users at lists.mcs.anl.gov wrote:
>
> Hi Nek Forum,
>
> I am using a variable viscosity formulation for a Rayleigh-Benard
> problem. I get the following error after some time :
>
> ERROR: Non-positive diffusivity ( -0.481 ) specified for field 1,
> group 0 element
>
> Please let me know what might be wrong.
>
> Thank you
> Swarandeep
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