[FLASH-USERS] Problem of 2D cylindrical setup

[Andy Sha Liao]

I think the cylindrical geometry only works if the lower y boundary is the
axis of rotation. So, you will have to manually rotate Windtunnel to blow
vertically (along y axis).


Andy

On Sun, May 22, 2022 at 1:37 PM Po-Yu Chang <pchang at mail.ncku.edu.tw> wrote:

> Hi all,
>
> I am trying to simulate a hydrodynamic problem in 2D cylindrical
> coordinate. Therefore, I started from the example "WindTunnel". This
> example was originally in the cartesian coordinate. Therefore, I had the
> following for the setup:
>
> ./setup -auto -2d +Cylindrical WindTunnel -objdir=WindTunnelCyl
>
> I found that in flash.par, the geometry was still set as
>
> "geometry = cartesian"
>
> Therefore, I replaced that line with
>
> "geometry = Cylindrical"
>
> Then, I found that if I set the boundary:
>
> "xl_boundary_type = axisymmetric"
>
> It gave an error message: "Error message is unsupported boundary
> condition on Lower Face"
>
> If I replaced the boundary to
>
> "xl_boundary_type = reflect"
>
> Then, it ran without errors.
>
> However, I believe the reflection boundary on the axis is not correct.
> It seems like the problem was still under cartesian coordinate even I
> set it to cylindrical coordinate during the "./setup" and changed the
> geometry to cylindrical in the flash.par. So, what did I miss for
> setting the cylindrical coordinate?
>
> Thank you.
>
> Cheers,
>
> Po-Yu
>
> --
> Po-Yu Chang
> Assistant Professor
> Institute of Space and Plasma Sciences (ISAPS)
> National Cheng Kung University (NCKU)
> No.1, University Road,
> Tainan City 70101, Taiwan
> (TEL) +886-6-2757575 ext. 65916
> pchang at mail.ncku.edu.tw
> http://capst.ncku.edu.tw/PGS/
>
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