[Nek5000-users] Small diffusivity. How heat/diffusion equations aresolved?

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

I have fixed the parameters and now it works fine for Sm=1000. Still it is interesting where it is better to read about nek solution of diffusion equations.

Thanks



> 6/26/2014 7:10:13 PM пользователь  (nek5000-users at lists.mcs.anl.gov) написал:
> 
> 
> I am trying to model inner waves in a salinity-stratified solution,
> for which kinematic viscosity is 10^-6, diffusivity is 10^-9, so Schmidt number is about 10^-3.
>  If I set viscosity=diffusivity=10^-6, the program works fine, but I get too great effect of diffusion.
> If I set diffusivity to be less than 10^-6, solution blows up.
> 
> In this connection I have two questions:
> 
> Is there a description how heat/diffusion equations are solved in nek5000?
> 
> Is it possible to change transport/diffusion equation just to transport equation, i.e. without diffusion at all?
> 
> Thanks.
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