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Fix incorrect scaling of Yukawa kernel #224

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Fix incorrect scaling of Yukawa kernel #224

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0edf8c6
Fix incorrect scaling of Yukawa kernel
inducer Mar 17, 2025
c692809
Add get_pde_as_diff_op to doc
inducer Mar 24, 2025
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5 changes: 3 additions & 2 deletions sumpy/kernel.py
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Original file line number Diff line number Diff line change
Expand Up @@ -149,6 +149,7 @@ class Kernel:
.. automethod:: get_global_scaling_const
.. automethod:: get_args
.. automethod:: get_source_args
.. automethod:: get_pde_as_diff_op
"""

if TYPE_CHECKING:
Expand Down Expand Up @@ -622,15 +623,15 @@ def __init__(self, dim, yukawa_lambda_name="lam"):
expr = var("hankel_1")(0, var("I")*lam*r)
scaling_for_K0 = var("pi")/2*var("I") # noqa: N806

scaling = -1/(2*var("pi")) * scaling_for_K0
scaling = 1/(2*var("pi")) * scaling_for_K0
elif dim == 3:
# NOTE: to get the expression, we do the following and simplify
# 1. express K(1/2, lam r) as a modified spherical Bessel function
# k(0, lam r) using [3] and use expression for k(0, lam r) from [4]
# 2. or use (AS 10.2.17) directly
expr = var("exp")(-lam*r) / r

scaling = -1/(4 * var("pi")**2)
scaling = 1/(4 * var("pi"))
else:
raise RuntimeError("unsupported dimensionality")

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2 changes: 1 addition & 1 deletion sumpy/version.py
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Expand Up @@ -41,4 +41,4 @@ def _parse_version(version: str) -> tuple[tuple[int, ...], str]:
VERSION, VERSION_STATUS = _parse_version(VERSION_TEXT)

_GIT_REVISION = find_module_git_revision(__file__, n_levels_up=1)
KERNEL_VERSION = (*VERSION, _GIT_REVISION, 0)
KERNEL_VERSION = (*VERSION, _GIT_REVISION, 1)
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