Claude
6a03f463bc
Samples every 0.5 s at synchronized root steps; trailing 5 s window (11
samples); range and |slope*window| each at most 1 % of the official band
width. States the fluid-on-cylinder force sign, reports cd_positive,
defaults to the refined case and uses the review's label.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
(cherry picked from commit 71221837f9)
218 lines
11 KiB
Python
218 lines
11 KiB
Python
"""Steady DFG 2D-1 (Re 20): refined and uniform runs against the official reference intervals.
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Not a full benchmark certification. Declared deviations from the official setup:
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pressure-NEQ outlet (``neq_extrap``) instead of do-nothing, local Zou-He inlet.
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Geometry, inflow profile, initial state, refined layout and observation reuse the
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pinned Re100 runner (``run_refined_dfg``) and ``re100_helpers`` unchanged; only the
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lattice viscosity is set for Re 20 (nu = U_lattice * D / 20 at the root level).
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Units. The helpers use scaled DFG units with mean inflow speed 1, so
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Cd = 2 Fx / (rho U^2 D) and Cl = 2 Fy / (rho U^2 D) are scale-free, and
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``pressure_probes`` returns dp / (rho U^2). The official p_diff = p(0.15, 0.2) -
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p(0.25, 0.2) uses U = 0.2 m/s, rho = 1, so p_diff = dp * 0.04. Both are reported;
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only p_diff is compared with the official interval. Forces use the existing sign
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convention: F is the force of the fluid on the cylinder, i.e. the refined raw
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exchange impulse (window ledger, ``total.impulse``) or the uniform ``read_force``,
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with x along the inflow and y up from the bottom wall. Cd must be positive, and the
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official Cl is positive (centre 0.20 below the centreline 0.205), so a flipped sign
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shows up as Cl outside its interval.
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Sampling. One sample every SAMPLE_TSTAR (t* = U t / D; 0.5 s), taken at the end of a
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completed root step with all levels synchronized; the step index is recorded. Cd
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and Cl are the mean over the sample interval (smooths step-parity/acoustic
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oscillation; equal to the instantaneous value at steady state); p_diff is the
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end-of-interval value at the exact surface points.
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Steady rule (frozen before any run). Over the trailing WINDOW_TSTAR (last 5 s, 11
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samples), both the range (max - min) and |least-squares slope * window| of each of
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Cd, Cl and p_diff must not exceed 1 % of the width of its official interval. These
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are absolute limits, so the small Cl is never a divisor, and the slope term catches
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slow monotone drift. If the rule fails at TSTAR_MAX the run reports "not steady" and
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gives no interval verdict; the limits are never relaxed after a run.
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"""
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import argparse
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import json
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import math
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import os
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from pathlib import Path
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import sys
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import time
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from tempfile import TemporaryDirectory
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import numpy as np
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HERE = Path(__file__).resolve().parent
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sys.path.insert(0, str(HERE))
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import run_refined_dfg as rr # noqa: E402
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RE = 20.0
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U_PHYS = 0.2 # m/s mean inflow; rho = 1
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TSTAR_MAX = 60.0 # 30 s physical
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SAMPLE_TSTAR = 1.0 # 0.5 s
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WINDOW_TSTAR = 10.0 # trailing 5 s
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# Schaefer & Turek (1996), 2D-1 lower/upper bounds.
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BANDS = dict(cd=(5.57, 5.59), cl=(0.0104, 0.0110), p_diff=(0.1172, 0.1176))
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STEADY_LIMIT = {k: (hi - lo) / 100 for k, (lo, hi) in BANDS.items()}
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DEVIATIONS = ("pressure-NEQ outlet (neq_extrap), not do-nothing", "local Zou-He inlet")
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_re100_config = rr.config
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def config(h, diameter, collision="SRT", jet_scenario="none"):
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"""The pinned Re100 configuration with the lattice viscosity set for Re 20."""
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if jet_scenario != "none":
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raise ValueError("DFG 2D-1 runs have no Jets")
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cfg, body, p = _re100_config(h, diameter, collision, jet_scenario)
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nu = p["mean_speed"] * p["diameter"] / RE
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cfg["physics"]["viscosity"] = nu
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return cfg, body, dict(p, viscosity=nu, re=RE)
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def lattice_parameters(diameter, speed=rr.SPEED):
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nu = speed * diameter / RE
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return dict(viscosity=nu, tau=0.5 + 3 * nu, steps=math.ceil(TSTAR_MAX * diameter / speed),
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interval=round(SAMPLE_TSTAR * diameter / speed))
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def sample(impulse, n, diameter, dp):
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den = rr.SPEED**2 * diameter / 2
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return dict(cd=float(impulse[0] / n / den), cl=float(impulse[1] / n / den),
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dp_scaled=float(dp), p_diff=float(dp) * U_PHYS**2)
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def summarize(rows):
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"""Steady rule over the trailing window, then the interval verdict (or none)."""
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if not rows or rows[-1]["tstar"] < TSTAR_MAX - 1e-9:
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return dict(status="INCOMPLETE", steady=False, verdict=None)
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window = [r for r in rows if r["tstar"] >= TSTAR_MAX - WINDOW_TSTAR - 1e-9]
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t = np.array([r["tstar"] for r in window])
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ranges = {k: max(r[k] for r in window) - min(r[k] for r in window) for k in BANDS}
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drifts = {k: abs(np.polyfit(t, [r[k] for r in window], 1)[0]) * WINDOW_TSTAR for k in BANDS}
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steady = all(ranges[k] <= STEADY_LIMIT[k] and drifts[k] <= STEADY_LIMIT[k] for k in BANDS)
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final = {k: rows[-1][k] for k in BANDS}
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result = dict(window_samples=len(window), ranges=ranges, drifts=drifts,
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steady_limits=STEADY_LIMIT, steady=steady, final=final, bands=BANDS,
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deviations=DEVIATIONS, cd_positive=final["cd"] > 0)
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if not steady:
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return dict(result, status="NOT_STEADY", verdict=None)
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inside = {k: BANDS[k][0] <= final[k] <= BANDS[k][1] for k in BANDS}
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return dict(result, status="WITHIN_INTERVALS" if all(inside.values()) else "OUTSIDE_INTERVALS",
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verdict=inside)
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def healthy(row):
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return row["max_mach"] <= 0.2 and row["rho_min"] >= 0.5 and row["rho_max"] <= 1.5
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def run_case(a, h, case):
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from contextlib import ExitStack
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from CelerisLab.cuda.context import CudaContext
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from CelerisLab.lbm.descriptors import FLUID
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from CelerisLab.lbm.refinement_stepper import FixedPatchStepper
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from CelerisLab.simulation import Simulation
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refined = case == "refined"
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cfgdict, bodydict, p = config(h, 40 if refined else 80, a.collision)
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lp = lattice_parameters(p["diameter"])
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rows = []
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with ExitStack() as stack:
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if refined:
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cfg, pair, body, host = rr.host_geometry(a.source, h, a.collision)
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context = stack.enter_context(CudaContext(0))
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backend = stack.enter_context(FixedPatchStepper(
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cfg, rr.PLACEMENTS["wide"], context=context, coarse_boundary="channel",
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base_block=rr.BASE_BLOCK, fine_block=rr.FINE_BLOCK, fine_objects=(body,),
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observe_raw_exchange=True, observe_window_exchange=True))
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from CelerisLab.lbm.channel import channel_masks
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from CelerisLab.lbm.refinement import ACTIVE
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from CelerisLab.lbm.descriptors import SOLID
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masks = [channel_masks(pair.coarse_shape)[0] & ~pair.covered,
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(pair.fine_kind == ACTIVE)
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& ((host.flags.reshape(pair.fine_shape) & SOLID) == 0)]
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backend.initialize(rr.initial_state(pair.coarse_shape, (0.0, 0.0), 1.0, root=True),
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rr.initial_state(pair.fine_shape, pair.fine_origin, 0.5))
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probe_p = dict(p, center=[(80.5 - pair.fine_origin[0]) / 0.5 - 0.5,
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(81.0 - pair.fine_origin[1]) / 0.5 - 0.5], radius=40.0)
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else:
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tmp = Path(stack.enter_context(TemporaryDirectory()))
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(tmp / "lbm.json").write_text(json.dumps(cfgdict))
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(tmp / "body.json").write_text(json.dumps(bodydict))
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sim = stack.enter_context(Simulation(str(tmp / "lbm.json"), str(tmp / "body.json"),
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device_id=0))
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sim.initialize()
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probe_p = p
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fluid = (sim.field.flag.reshape(p["ny"], p["nx"]) & FLUID) != 0
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begin = 0
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while begin < lp["steps"]:
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rr.check_deadline(a.deadline)
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n = min(lp["interval"], lp["steps"] - begin)
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if refined:
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impulse = rr.advance_refined_interval(backend, n, a.deadline, "window")
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fields = [rr.macros(g) for g in backend.download()]
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rho, ux, uy = fields[1]
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fluid = masks[1]
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vals = [tuple(v[m] for v in f) for m, f in zip(masks, fields)]
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else:
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impulse, done = np.zeros(2), 0
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while done < n:
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batch = min(100, n - done)
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sim.run(batch)
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impulse += sim.read_force(0).astype(np.float64) * batch
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done += batch
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m = sim.get_macroscopic()
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rho, ux, uy = [np.asarray(m[k], np.float64).reshape(p["ny"], p["nx"])
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for k in ("rho", "ux", "uy")]
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vals = [(rho[fluid], ux[fluid], uy[fluid])]
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begin += n
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row = dict(step=begin, tstar=begin * rr.SPEED / p["diameter"],
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**sample(impulse, n, p["diameter"],
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h.pressure_probes(rho, fluid, probe_p)["dp"]),
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rho_min=float(min(v[0].min() for v in vals)),
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rho_max=float(max(v[0].max() for v in vals)),
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max_mach=float(max(np.sqrt(3 * (v[1]**2 + v[2]**2)).max() for v in vals)))
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rr.ensure_finite(row)
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rows.append(row)
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if not healthy(row):
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break
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summary = summarize(rows) if healthy(rows[-1]) else dict(status="UNHEALTHY", steady=False,
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verdict=None)
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return dict(case=case, collision=a.collision, lattice=lp, rows=rows, **summary)
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def plan(collision="SRT"):
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return dict(re=RE, collision=collision, tstar_max=TSTAR_MAX, sample_tstar=SAMPLE_TSTAR,
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window_tstar=WINDOW_TSTAR, bands=BANDS, steady_limits=STEADY_LIMIT,
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deviations=DEVIATIONS, pressure_scale=U_PHYS**2,
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refined_root=lattice_parameters(40), refined_fine_tau=0.5 + 3 * 2 * rr.SPEED * 40 / RE,
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uniform=lattice_parameters(80),
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label="compared against the official reference bands (non-canonical neq_extrap outlet, zou_he_local inlet); not a full benchmark certification")
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def main():
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parser = argparse.ArgumentParser(description=__doc__.splitlines()[0])
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parser.add_argument("--case", choices=["refined", "uniform", "both"], default="refined")
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parser.add_argument("--collision", choices=["SRT", "MRT"], default="SRT")
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parser.add_argument("--source", type=Path, default=rr.DEFAULT_SOURCE)
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parser.add_argument("--output", type=Path, required=True)
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parser.add_argument("--plan", action="store_true", help="Write the frozen plan; no CUDA")
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parser.add_argument("--max-wall-seconds", type=float)
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a = parser.parse_args()
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a.source = a.source.resolve()
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a.output.mkdir(parents=True, exist_ok=False)
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(a.output / "plan.json").write_text(json.dumps(plan(a.collision), indent=2, allow_nan=False))
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if a.plan:
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return
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if not a.max_wall_seconds or a.max_wall_seconds <= 0 or not os.environ.get("CUDA_VISIBLE_DEVICES"):
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raise SystemExit("GPU run needs --max-wall-seconds > 0 and explicit CUDA_VISIBLE_DEVICES")
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h, _ = rr.helpers(a.source)
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rr.config = config # host_geometry builds its root configuration through this name
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a.deadline = time.monotonic() + a.max_wall_seconds
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cases = ["refined", "uniform"] if a.case == "both" else [a.case]
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results = [run_case(a, h, case) for case in cases]
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(a.output / "result.json").write_text(json.dumps(results, indent=2, allow_nan=False))
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if __name__ == "__main__":
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main()
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