Analytical tests batch 2#68
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Seven manufactured benchmarks covering infiltration (Horton, Green-Ampt), LID exfiltration, kinematic wave, and ODE solver (exponential decay, logistic growth, SIR epidemic). Each benchmark carries definition.md, reference.csv, and provenance.yaml with primary literature citations. Test coverage: - test_ode_solver.cpp (new): ODE integrator and root-finder unit tests, plus trajectory benchmarks for exponential decay, logistic growth, and SIR epidemic (conservation + phase-plane invariants + qualitative dynamics); SIR CSV trajectory test skips until reference is populated. - test_infiltration.cpp: Horton and Green-Ampt saturated-branch trajectory benchmarks only; ODE/FindRoot tests moved to test_ode_solver.cpp. - test_routing.cpp: kinematic-wave normal-depth steady-state benchmark. - test_lid.cpp: constant-area exfiltration benchmark. Also fixes KinematicWave.cpp getAofS call (s_needed * a_full → s_needed) that caused incorrect cross-sectional area lookup in the KW solver. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
LID.cpp batchBarrelFlux never applied stor_ksat — wb_infil was unconditionally zero for all rain-barrel storage units. Added Euler exfiltration step (exact for constant-rate ODE). Green-Ampt trajectory test was sub-stepping at dt=1 s (up to 8793 Newton solves), accumulating ~0.035 ft of round-off against a 1e-3 ft criterion. Replaced with one implicit solve per benchmark interval — the method is exact for any dt. Horton RMS tolerance tightened beyond the 8-digit CSV precision; relaxed from 1e-10 to 1e-9 ft. SIR epidemic integration extended from t=60 to t=120 — with R0=3 and γ=0.1 the infected fraction does not drop below 1% until ~t=80. CMake: made OpenMP linkage conditional to fix macOS no-libomp builds; guarded regression CTest registration against missing data dir. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
These changes were specific to a no-libomp macOS dev environment and should not be part of the engine build configuration. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
… CSV Writes the genuine cross-code reference trajectory for the odesolve-sir-epidemic benchmark using Flash-X's independent Fortran CashKarp45 implementation (eFrac=1e-12), replacing the t=0 placeholder. SIRTrajectoryMatchesBenchmark now runs (was previously SKIPPED). Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
The generator (tools/generate_sir_reference/) requires a local Flash-X checkout at a hardcoded path and cannot be run by other contributors. The reference CSV it produced is already committed; generation methodology is fully documented in provenance.yaml and definition.md. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
t_end_s 60→120, planned_t_eval_s extended to 120, dataset status placeholder→populated, generation script replaced with a prose note describing the Flash-X Fortran driver that produced the CSV. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
t_end 60→120, qualitative dynamics updated to match actual trajectory, reference dataset section replaced with accurate description of the committed CSV and where to find rebuild instructions. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
- test_ode_solver.cpp: update SIR skip comment to reflect populated reference.csv and point to provenance.yaml instead of missing .py script - test_infiltration.cpp, test_lid.cpp: move benchmark includes (fstream/sstream/string/vector) to top include block; remove duplicates that were left mid-file - LID.cpp batchBarrelFlux: apply stor_clog reduction via getStorageExfil so rain-barrel exfiltration is consistent with other storage-based LIDs Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Nine new benchmark datasets under tests/benchmarks/manufactured/ covering kinematic-wave transient, force-main friction (HW + DW), GVF M1 backwater, quality CSTR decay, groundwater linearized recession, Green-Ampt exfiltration geometry, LID cylindrical clogging, modified Horton saturation recovery, and circular cross-section ellipse reference. Two new test suites (test_exfiltration.cpp, test_massbalance.cpp) and extensions to six existing test files; all 256 tests pass. Also includes CMake wiring for BENCHMARK_DATA_DIR in the new executables. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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Pull request overview
Adds nine analytical/manufactured benchmark datasets (CSV + provenance.yaml + definition.md), two new GoogleTest files (test_exfiltration.cpp, test_massbalance.cpp), extends six existing test files with benchmark trajectory tests, and wires BENCHMARK_DATA_DIR into the corresponding CMake targets. Also includes two small functional fixes — a normal‑depth inversion in KWSolver::solveConduit (getAofS now receives a dimensional section factor) and storage‑floor exfiltration accounting in LIDSolver::batchBarrelFlux — plus a benchmark‑data layout README/conventions doc and .gitignore additions for working notes.
Changes:
- New manufactured benchmark datasets and supporting docs/conventions under
tests/benchmarks/manufactured/. - New and extended GoogleTest cases that load reference CSVs and compare solver output to closed‑form/quasi‑exact references; ODE & FindRoot tests moved out of
test_infiltration.cppinto a newtest_ode_solver.cpp. - Source fixes: KW inlet‑area inversion uses dimensional section factor; barrel storage now applies floor exfiltration each step (depth,
infil_loss,wb_infil).
Reviewed changes
Copilot reviewed 63 out of 65 changed files in this pull request and generated 4 comments.
Show a summary per file
| File | Description |
|---|---|
| tests/unit/engine/CMakeLists.txt | Adds new test targets and injects BENCHMARK_DATA_DIR per-test. |
| tests/unit/engine/test_routing.cpp | Adds KW normal-depth, KW step-inflow mass-balance, force-main friction, and DW GVF M1 backwater benchmark tests. |
| tests/unit/engine/test_ode_solver.cpp | New file: ODE/FindRoot unit tests + exponential, logistic, and SIR benchmark trajectory tests. |
| tests/unit/engine/test_infiltration.cpp | Removes ODE/FindRoot tests; adds Horton, Modified Horton, Green-Ampt benchmark trajectory tests. |
| tests/unit/engine/test_lid.cpp | Adds storage-exfil constant-area and clogging trajectory benchmarks. |
| tests/unit/engine/test_groundwater.cpp | Adds linearized GW recession benchmark test. |
| tests/unit/engine/test_quality_routing.cpp | Adds CSTR first-order decay trajectory benchmark test. |
| tests/unit/engine/test_xsection.cpp | Adds circular-area-vs-ellipse reference benchmark. |
| tests/unit/engine/test_exfiltration.cpp | New file: storage-node exfil geometry + Green-Ampt benchmark. |
| tests/unit/engine/test_massbalance.cpp | New file: closed-system continuity tests for runoff/routing/quality C API. |
| src/engine/hydraulics/KinematicWave.cpp | Bug fix: getAofS now called with dimensional section factor (not normalized). |
| src/engine/hydrology/LID.cpp | Adds storage-floor exfiltration to batchBarrelFlux and updates water-balance fields. |
| tests/benchmarks/README.md, conventions.md, provenance-template.md | New benchmark directory layout, unit conventions, provenance template. |
| tests/benchmarks/manufactured/* | 13 new manufactured benchmark datasets (definition.md + provenance.yaml + reference.csv). |
| .gitignore | Excludes two doc working notes. |
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| tolerances: | ||
| ss_convergence_rel: 0.005 | ||
| mass_balance_rel: 0.001 | ||
| basis: > | ||
| KW Preissmann scheme is conservative and SS-convergent. The 0.5% and 0.1% | ||
| tolerances are loose relative to expected O(dt^2) discretization error. | ||
| They are tight enough to catch any real solver regression. |
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| // exact properties are verified: | ||
| // 1. SS convergence: Q_out(T) ≈ Q_in (within 0.5%) | ||
| // 2. Mass balance: |V_in - V_out - delta_V_stored| / V_in < 0.1% | ||
| // ============================================================================ |
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| Python script using scipy.integrate.solve_ivp (RK45, rtol=1e-10, atol=1e-12) | ||
| to integrate dy/dx = (S0 - Sf) / (1 - Fr^2) from x=1000 to x=0, | ||
| with boundary condition y(x=1000) = y_d = 1.5 * y_n. |
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| double rms_err = std::sqrt(sum_sq / static_cast<double>(rows.size() - 1)); | ||
| EXPECT_LT(max_err, 1e-5) | ||
| << "ODE exponential-decay max error " << max_err | ||
| << " exceeds 1e-5 tolerance (benchmark: " << path << ")"; | ||
| EXPECT_LT(rms_err, 1e-6) | ||
| << "ODE exponential-decay RMS error " << rms_err | ||
| << " exceeds 1e-6 tolerance"; |
The 0.1% value was left over from an earlier draft. The actual test and CSV both use 5% because the KW no-flow branch on step 1 introduces a ~Q*dt systematic offset (~10% of V_in) that makes a tighter bound incorrect by construction. Expand the basis comment to explain why. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
The mass-balance criterion comment said "< 0.1%" but the actual tolerance is 5%. Expand the comment to explain why: the KW no-flow branch on step 1 introduces a ~Q*dt systematic offset that makes a tighter bound incorrect by construction. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
The generated_by field said "scipy.integrate.solve_ivp (RK45)" but the problem.integration_scheme and computation block both say "fixed-step RK4 with dx = -200 ft". Replace with the consistent description. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
rows.size() - 1 is 0 when the CSV has exactly one data row, producing NaN/Inf in the RMS computation instead of a clear failure. Add ASSERT_GE(rows.size(), 2u) before each n computation in test_ode_solver.cpp, test_groundwater.cpp, test_quality_routing.cpp, and test_lid.cpp (two benchmarks). Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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What this adds
Nine new benchmark datasets, each with a definition.md, reference.csv, and provenance.yaml:
Two new test files:
Six existing test files extended with new benchmark tests.
Test counts (all passing)
infiltration 33/33 · massbalance 7/7 · ode_solver 12/12 · lid 49/49 · routing 65/65 · quality_routing 16/16 · groundwater 13/13 · exfiltration 2/2 · xsection 59/59
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