CBB-2D v1.5.0: A curated benchmark dataset of drag/lift coefficients and Strouhal numbers for 2D circular and elliptical cylinders versus Reynolds number

It tabulates the time-averaged drag coefficient (Cd), Strouhal number (St) and lift coefficient (Cl, mean and rms/amplitude) for a stationary smooth circular cylinder (Re = 0.1 to 7e6, covering creeping, steady-separated, laminar-shedding, wake-transition, subcritical, critical/drag-crisis, supercritical and transcritical regimes) and for 2D elliptical cylinders (intrinsic major/minor axis ratio 1:1 to 100:1, with an explicit major-axis-orientation field and a projected streamwise/cross-stream axis-ratio field, Re = 0.1 to 1e5).</p><p><br></p><p dir="ltr">The dataset contains 252 records in five CSV tables, all with full source traceability, method type, flow-regime label, uncertainty estimate and a three-level quality flag.

Version 1.5.0 adds a derived unified query layer and a fitted-scaling-law layer without adding source records: cbb2d_master_query.csv merges all five tables into a single 252-row schema served by the included query tool (query_cbb2d.py: filtering by family, Reynolds-number range, angle of attack, axis ratio, quality flag, method and regime, nearest-Re lookup and CSV export), and fitted_scaling_laws.csv stores 16 least-squares scaling laws fitted from the dataset itself, each with R-squared, sample size, declared validity ranges and usage cautions - including the by-design weak fits that quantify regime boundaries (Strouhal-axis-ratio insensitivity below Re = 200; breakdown of the sin(2*alpha) lift-amplitude law at Re = 100).