[Nek5000-users] Curved GLL Points on Airfoil

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

Hi Paul,

I tried calling fix_geom in usrdat2 and it did not fix the problem.

Jérémie

On Sunday, October 26, 2014, <nek5000-users at lists.mcs.anl.gov> wrote:

>
>  Hi Jeremie,
>
>  Try calling "fix_geom"
>
>  in usrdat2 after you modify the sides... this might provide the
> requisite mesh clean up.
>
>  Paul
>
>  ------------------------------
> *From:* nek5000-users-bounces at lists.mcs.anl.gov
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> *Subject:* [Nek5000-users] Curved GLL Points on Airfoil
>
>   Hello Neks,
>
>
>
> I am trying to simulate the flow around an interpolated airfoil with
> curved boundaries. To do so I am generating the collocation points
> separately and writing them into an input file, which is read in the
> usrdat2 subroutine before geometry re-initialization. The only curved
> elements in the mesh are located at the airfoil boundary. I am not getting
> any errors during geometry re-initialization. However, the calculation
> starts off with a large courant number (around 7), which ends up diverging
> after 5 times steps. Along the element edges near the airfoil, there seems
> to be discontinuities in the flow which cause the solution to diverge.
> However, when inputting non-curvilinear collocation points, written in the
> exact same order to the input file, the simulation runs flawlessly.
>
>
>
> Are there any switches that must be activated in the rea file for curved
> elements?
>
>
>
> If not, are there any general guidelines to using curved elements in this
> manner?
>
>
>
> Thanks,
>
>
>
> Jeremie
>
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