[Nek5000-users] variable viscosity formulation

[nek5000-users at lists.mcs.anl.gov]

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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