[Nek5000-users] Rotating Frame work

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

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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