Re: [sparta-users] Help

[WUYONGXIN <183...@16...>]

Dear Steve,



Thank you for your prompt reply.


Regarding the rotation, I was referring to simulating rotating components (e.g., rotating walls or rotor) in my simulation. Specifically, I would like to know how to properly set up the rotation effects in SPARTA—whether it should be done through the rotate command in surf_collide or if there are other recommended methods. Any guidance or suggestions on this would be greatly appreciated.


Thank you for your time and assistance.
Best regards,



At 2026-01-19 23:38:20, "Steve Plimpton" <sj...@gm...> wrote:

Hi - it looks like the tools/grid_refine.py tool has not been updated to use the newer grid file format
used by the read_grid, write_grid, adapt_grid, and fix_adapt commands.


So we can update the python file to use the common format.


Re: rotation, I'm not sure what you mean.  Do you mean in the context of grid adaptation?
Or just to include rotation effects in collisions?


Steve


On Mon, Jan 19, 2026 at 2:50 AM WUYONGXIN <183...@16...> wrote:

Dear sparta：
     My name is Yongxin Wu, and I am a student from ‌Zhejiang University from China.


    When using the grid_refine function in SPARTA to mesh a 3D geometry, a mesh file in parents format is generated. This file cannot be read by the read_grid command. May I ask how to convert it into a cells format file that the program can use? Additionally, if I want to account for the rotational effect of the wall, should I use the rotate command in surf_collide?


    Thank you for your time.
    Best regards



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