Error with the Kelvin-Helmholtz instability example

[MODI ATHARVA SOMSHEKHAR]

I am trying to get started with Dedalus and I have installed the v2.2006 version. I had some problems while running " python3 -m dedalus test " part of the installation but on some light googling I found this was mostly to do with some minimal numpy version compatibility. Nevertheless, I continued with running the Kelvin Helmholtz script and I am getting the following output,

Traceback (most recent call last):
  File "/home/antineutrino03/kel_helm.py", line 48, in <module>
    problem.add_equation("dt(u) + dx(p) - 1/Re*(dx(dx(u)) + dy(uy)) = - u*dx(u) - v*uy")
  File "/home/antineutrino03/anaconda3/envs/dedalus2/lib/python3.10/site-packages/dedalus/core/problems.py", line 131, in add_equation
    self._build_object_forms(temp)
  File "/home/antineutrino03/anaconda3/envs/dedalus2/lib/python3.10/site-packages/dedalus/core/problems.py", line 152, in _build_object_forms
    temp['LHS'] = field.Operand.parse(temp['raw_LHS'], self.namespace, self.domain)
  File "/home/antineutrino03/anaconda3/envs/dedalus2/lib/python3.10/site-packages/dedalus/tools/cache.py", line 29, in __get__
    attribute = self.method(instance)
  File "/home/antineutrino03/anaconda3/envs/dedalus2/lib/python3.10/site-packages/dedalus/core/problems.py", line 172, in namespace
    namespace[var] = self.domain.new_field(name=var)
  File "/home/antineutrino03/anaconda3/envs/dedalus2/lib/python3.10/site-packages/dedalus/core/problems.py", line 37, in __setitem__
    raise SymbolicParsingError("Name '{}' is used multiple times.".format(key))
dedalus.tools.exceptions.SymbolicParsingError: Name 'sy' is used multiple times.

Can someone please help me with understanding what this is?

Thanks and regards

Atharva

[Keaton Burns]

Hi Atharva,

Sorry this was a bug in the example that we didn’t catch before the 2.2006 release.  There was a change so that “sy” corresponds to the grid spacing in the y dimension, to be used for CFL calculations, etc., so that was no longer an allowed variable name in v2.2006. If you change the variables “sy” to “Sy” or something else, the example should run.

Best,

-Keaton

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