Outflow boundary conditions along x

[Manohar Teja]

Hi all,

Have some tried using outflow boundary conditions in a 2D domain? I am trying to simulate a 2D box with outflow boundary conditions along x. I have used Fourier basis along x and given boundary conditions as

# Background conditions
problem.add_equation("dx(u)(x=0) = 0")
problem.add_equation("dx(u)(x=1) = 0")

In the above my intention is to set du/dx = 0 at left and right of the domain, which I belive gives the outflow boundary conditions? Am I doing this correctly?

While I try to run, an error comes up
/home/manohar/miniforge3/envs/dedalus3/lib/python3.12/site-packages/dedalus/core/arithmetic.py:250: RuntimeWarning: invalid value encountered in add
  np.add(arg0.data, arg1.data, out=out.data)

I don't suppose this is because of boundary conditions but I am just trying to make sure.

Also if there is a more straightforward way to implement outflow boundary conditions, could someone tell me?

Regards.

Manohar Teja Kalluri

CGAFD, Univ of Exeter

[Keaton Burns]

Hi Manohar,

Boundary conditions cannot be set on a Fourier basis.

Best,

-Keaton

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