[Nek5000-users] Rotating Frame work

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

Hi Paul,
We will add the two forcing terms in userf.
I thought maybe one could do it implicitly but since, as you say, it
worked like that it is probably the simplest choice.
Thank you.
Antonios



nek5000-users at lists.mcs.anl.gov wrote:
>
> Hi Antonios,
>
> I typically do this by explicitly adding a Coriolis term
> in userf, and, if I have solid-body rotation, applying a "v  "
> boundary condition with the appropriate rotation to any
> stationary surfaces.
>
> Note that if you have variable density, you should also
> add a centrifugal force term - this can be important in
> some cases, though it is often neglected.
>
> The Coriolis treatment is explicit and can in some cases
> lead to a tighter timestep stability constraint than the
> std. CFL constraint, but I've not found that to be an
> issue in my (perhaps limited) experience.
>
> Paul
>
>
> On Thu, 10 Mar 2011, nek5000-users at lists.mcs.anl.gov wrote:
>
>> Hello!
>> We are considering running some wind-turbine simulations using nek5000
>> and we are wondering if there is a rotating framework mode in the code?
>> In principle one needs to add some extra forcing terms from the
>> rotation. I wonder if one can do that implicitly.
>> Also, we would like to use some type of pipe flow mesh with azimuthal
>> symmetry. Is that possible?
>> Best regards,
>> Antonios
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