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test(postprocessing): check signed magnitudes in 1-D faceflow cases #2846

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test(postprocessing): check signed magnitudes in 1-D faceflow cases #2846

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10 changes: 10 additions & 0 deletions autotest/test_postprocessing.py
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Original file line number Diff line number Diff line change
Expand Up @@ -149,6 +149,16 @@ def test_get_structured_faceflows(function_tmpdir, nlay, nrow, ncol):
assert np.any(fff) == (nrow > 1)
assert np.any(flf) == (nlay > 1)

if nlay * nrow * ncol == 3:
# The 1-D cases have unit K and cell dimensions, with all heads
# prescribed as 11, 12, 13. Darcy flow is -1 toward increasing
# column, row, or layer number; the final face has no neighbor.
expected = np.array([-1.0, -1.0, 0.0]).reshape(nlay, nrow, ncol)
for flow, size in zip((frf, fff, flf), (ncol, nrow, nlay)):
if size == 3:
np.testing.assert_allclose(flow, expected, rtol=0.0, atol=1e-8)
assert flow.flat[-1] == 0.0


@pytest.mark.mf6
@requires_exe("mf6")
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