[FLASH-USERS] Problem of 2D cylindrical setup

[Lu, Yingchao]

Do you have magnetic field in the simulations? If not with B-field, I think "axisymmetric" and "reflect" do the same thing. If there is B-field, as the user guide says "axisymmetric" is "like reflect, but both normal and toroidal vector components change sign."

Best,
Yingchao

From: flash-users <flash-users-bounces at flash.rochester.edu> on behalf of Andy Sha Liao <andy at f.energy>
Date: Tuesday, May 24, 2022 at 9:42 AM
To: Po-Yu Chang <pchang at mail.ncku.edu.tw>
Cc: flash-users at flash.rochester.edu <flash-users at flash.rochester.edu>
Subject: Re: [FLASH-USERS] Problem of 2D cylindrical setup
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<mailto: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<mailto:pchang at mail.ncku.edu.tw>
http://capst.ncku.edu.tw/PGS/

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