add my own stl for the Channel flow tutorial case.

[xiongxin9000]

Hi,

Please can I ask how to add my own STL file to simulate the tutorial channle flow case with Re_tau=180.

Can you advise what the work flow of it. Whether I have to modify the subroutine complex_channleflow to include STL read or what else.

Because the input.i3d file is different from the sphere case, the python3 generate epsilon does not work.

Thank you very much for your time

Regards,
Xin