85 lines
3.2 KiB
Python
85 lines
3.2 KiB
Python
"""Real config loading and pure structural update for the frozen development case."""
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import importlib.util
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import math
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from pathlib import Path
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import numpy as np
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import pytest
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path = Path(__file__).resolve().parents[2] / 'research/steady_pinball/run.py'
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spec = importlib.util.spec_from_file_location('steady_pinball_run', path)
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runner = importlib.util.module_from_spec(spec)
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spec.loader.exec_module(runner)
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def test_actual_loader_and_paper_geometry(tmp_path):
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import json
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from CelerisLab.config import load_lbm_config
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p = tmp_path/'config.json'
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p.write_text(json.dumps(runner.config()))
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cfg = load_lbm_config(str(p))
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cfg.validate()
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assert (cfg.nx, cfg.ny, cfg.viscosity, cfg.velocity) == (1280, 512, .004, .01)
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assert cfg.collision == 'MRT' and cfg.y_wall_bc == 'bounce_back'
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assert runner.U * runner.D / runner.NU == 50.
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assert runner.CENTRES == ((600., 255.5), (626., 270.5), (626., 240.5))
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def test_structure_rest_equilibrium_and_energy_decay():
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s = runner.Structure(zeta=.01)
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assert s.candidate(0.) == (0., 0.)
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assert s.mass == pytest.approx(10*3*math.pi*100)
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s.y, s.v = .2, 0.
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# One damped period: independent continuous solution at total elapsed time.
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for _ in range(runner.PERIOD):
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s.y, s.v = s.candidate(0.)
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t = runner.PERIOD
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a = s.zeta*s.omega
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w = s.omega*math.sqrt(1-s.zeta**2)
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expected = .2*math.exp(-a*t)*(math.cos(w*t)+a/w*math.sin(w*t))
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assert s.y == pytest.approx(expected, abs=2e-12)
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assert .5*s.mass*s.v*s.v+.5*s.stiffness*s.y*s.y < .5*s.stiffness*.2**2
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s.y, s.v = .3, 0.
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assert s.candidate(s.stiffness*.3) == pytest.approx((.3, 0.), abs=1e-15)
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def test_report_uses_completed_rows_and_net_force():
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rows = np.zeros((4, 15))
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rows[:, 0] = np.arange(1, 5)
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rows[:, 1] = 2.
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rows[:, 3:9] = 1.
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got = runner.summarize(rows)
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assert got[0]['end_step'] == 4
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assert got[0]['y_rms_D'] == .1
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assert got[0]['fy_rms'] == 6.
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@pytest.mark.parametrize('case', ['Z0', 'M2', 'R2'])
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def test_zero_damping_cases_conserve_unforced_energy_and_match_forced_solution(case):
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s = runner.Structure(*runner.STRUCTURES[case])
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assert s.zeta == s.damping == 0.
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s.y, s.v = .2, 1.e-5
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y0, v0 = s.y, s.v
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energy = .5*s.mass*v0**2 + .5*s.stiffness*y0**2
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for _ in range(12345):
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s.y, s.v = s.candidate(0.)
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assert .5*s.mass*s.v**2 + .5*s.stiffness*s.y**2 == pytest.approx(energy, rel=2e-11)
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force, elapsed = 1.e-4, 3210
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s.y, s.v = y0, v0
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for _ in range(elapsed):
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s.y, s.v = s.candidate(force)
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phase = s.omega*elapsed
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equilibrium = force/s.stiffness
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expected_y = equilibrium+(y0-equilibrium)*math.cos(phase)+v0*math.sin(phase)/s.omega
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expected_v = -(y0-equilibrium)*s.omega*math.sin(phase)+v0*math.cos(phase)
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assert (s.y, s.v) == pytest.approx((expected_y, expected_v), abs=2e-11)
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def test_predeclared_comparisons_change_structure_only():
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z, m, r = [runner.Structure(*runner.STRUCTURES[k]) for k in ['Z0', 'M2', 'R2']]
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assert m.mass/z.mass == pytest.approx(.2)
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assert m.stiffness/z.stiffness == pytest.approx(.2)
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assert r.mass == m.mass
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assert r.stiffness/m.stiffness == pytest.approx(.36)
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assert [runner.STEPS*s.frequency for s in [z, m, r]] == pytest.approx([60., 60., 36.])
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