Dear Fipy Team,
First of all I would like to thank you for your amazing work! I love working
with fipy.
I have a problem when I calculate the gradient of my variable in cylindrical
coordinates. You can see the code I used below this line.
from fipy import *
from fipy import CellVariable, FaceVariable, Grid2D, TransientTerm, \
UpwindConvectionTerm, DiffusionTerm, ImplicitSourceTerm, CylindricalGrid2D
L = 89e-3 # m
diameterChamber = 13.75e-3
radius = diameterChamber/2
dz = 1e-3
dr = 0.75e-3
nz = round(L/dz)
nr = round(radius/dr)
#mesh = Grid2D(dx=dx, nx=nx, dy=dy, ny=ny)
mesh = CylindricalGrid2D(dz=dz, nz=nz, dr=dr, nr=nr)
pressure_0 = CellVariable(mesh=mesh, name='Pressure Gas', hasOld=1)
pressure_0.setValue(1e5)
pressure_0.grad.value
The pressure is constant all over the domain so I would expect the gradient to
be zero. just as it is in Cartesian coordinates. But I get this:
array([[ 2666.66666667, 888.88888889, 533.33333333, ...,
205.12820513, 177.77777778, 156.8627451 ],
[ 0. , 0. , 0. , ...,
0. , 0. , 0. ]])
Could you please help me? Am I doing something wrong? is it a bug?
I would like also to contribute to the community with an example of
compressible flow with euler equations in 2D Cartesian coordinates. I validated
the results with SOD shock tube and I was quite happy with it. With whom should
I talk to review it and possibly upload it?
Kind regards,
Leyton
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