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Markus Holzer
lbmpy
Commits
27b86f84
Commit
27b86f84
authored
Jan 11, 2021
by
Markus Holzer
Committed by
Michael Kuron
Jan 11, 2021
Browse files
Move special fd stencils to lbmpy
parent
0023726c
Changes
3
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Inline
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.gitignore
View file @
27b86f84
...
...
@@ -11,5 +11,6 @@ _build
/.idea
_local_tmp
**/.vscode
/lbmpy_tests/db
doc/bibtex.json
/html_doc
\ No newline at end of file
/html_doc
lbmpy/phasefield/fd_stencils.py
0 → 100644
View file @
27b86f84
import
sympy
as
sp
from
pystencils.fd.spatial
import
fd_stencils_standard
def
fd_stencils_isotropic_high_density_code
(
indices
,
dx
,
fa
):
dim
=
fa
.
field
.
spatial_dimensions
if
dim
==
1
:
return
fd_stencils_standard
(
indices
,
dx
,
fa
)
elif
dim
==
2
:
order
=
len
(
indices
)
if
order
==
1
:
idx
=
indices
[
0
]
assert
0
<=
idx
<
2
other_idx
=
1
if
indices
[
0
]
==
0
else
0
weights
=
{
-
1
:
sp
.
Rational
(
1
,
12
)
/
dx
,
0
:
sp
.
Rational
(
1
,
3
)
/
dx
,
1
:
sp
.
Rational
(
1
,
12
)
/
dx
}
upper_terms
=
sum
(
fa
.
neighbor
(
idx
,
+
1
).
neighbor
(
other_idx
,
off
)
*
w
for
off
,
w
in
weights
.
items
())
lower_terms
=
sum
(
fa
.
neighbor
(
idx
,
-
1
).
neighbor
(
other_idx
,
off
)
*
w
for
off
,
w
in
weights
.
items
())
return
upper_terms
-
lower_terms
elif
order
==
2
:
if
indices
[
0
]
==
indices
[
1
]:
idx
=
indices
[
0
]
diagonals
=
sp
.
Rational
(
1
,
8
)
*
sum
(
fa
.
neighbor
(
0
,
i
).
neighbor
(
1
,
j
)
for
i
in
(
-
1
,
1
)
for
j
in
(
-
1
,
1
))
div_direction
=
sp
.
Rational
(
1
,
2
)
*
sum
(
fa
.
neighbor
(
idx
,
i
)
for
i
in
(
-
1
,
1
))
center
=
-
sp
.
Rational
(
3
,
2
)
*
fa
return
(
diagonals
+
div_direction
+
center
)
/
(
dx
**
2
)
else
:
return
fd_stencils_standard
(
indices
,
dx
,
fa
)
raise
NotImplementedError
(
"Supports only derivatives up to order 2 for 1D and 2D setups"
)
lbmpy_tests/phasefield/test_entropic_model.ipynb
View file @
27b86f84
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