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research: Dütsch driver — periodic Morison bases from step mod T

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Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Claude
2026-10-30 11:00:06 +00:00
co-authored by Claude Opus 5.5
parent 04a33246a1
commit 9cfcd8bb96
2 changed files with 2 additions and 1 deletions
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research/duetsch_re100_kc5/protocol.py
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@@ -53,7 +53,7 @@ def interval_bases(n, T, points=16):
"""Single-step interval averages over [n, n + 1] of cos phi |cos phi| and sin phi """Single-step interval averages over [n, n + 1] of cos phi |cos phi| and sin phi
(phi in radians = 2 pi s / T - pi / 2), Gauss-Legendre quadrature.""" (phi in radians = 2 pi s / T - pi / 2), Gauss-Legendre quadrature."""
x, w = np.polynomial.legendre.leggauss(points) x, w = np.polynomial.legendre.leggauss(points)
s = n + 0.5 * (x + 1.0) s = int(n) % T + 0.5 * (x + 1.0) # periodic: identical bases in every cycle
phi = 2.0 * np.pi * s / T - 0.5 * np.pi phi = 2.0 * np.pi * s / T - 0.5 * np.pi
c = np.cos(phi) c = np.cos(phi)
return 0.5 * float(np.sum(w * c * np.abs(c))), 0.5 * float(np.sum(w * np.sin(phi))) return 0.5 * float(np.sum(w * c * np.abs(c))), 0.5 * float(np.sum(w * np.sin(phi)))
tests/unit/test_duetsch_protocol.py
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@@ -73,6 +73,7 @@ def test_geometry_repeats_exactly_across_cycles():
v0 = p.position(m + 1, T, A) - p.position(m, T, A) v0 = p.position(m + 1, T, A) - p.position(m, T, A)
assert p.position(m + 1 + c * T, T, A) - p.position(m + c * T, T, A) == v0 assert p.position(m + 1 + c * T, T, A) - p.position(m + c * T, T, A) == v0
assert p.cycle(T // 4 + 5 * T, T) == 6 # unwrapped index stays separate assert p.cycle(T // 4 + 5 * T, T) == 6 # unwrapped index stays separate
assert p.interval_bases(123 + 7 * T, T) == p.interval_bases(123, T)
def test_exact_point_inside_body_is_missing_even_with_fluid_corners(): def test_exact_point_inside_body_is_missing_even_with_fluid_corners():