2026-10-09T06:15:47Z https://api.figshare.com/v2/oai

oai:figshare.com:article/33991126 2026-09-24T23:06:30Z category_26620 category_26599 category_26590 item_type_3 month_year_09_2026

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 zhibo wang (25076026) Fluid mechanics and thermal engineering not elsewhere classified Fundamental and theoretical fluid dynamics Computational methods in fluid flow, heat and mass transfer (incl. computational fluid dynamics) circular cylinde elliptic cylinder drag coefficient lift coefficient Strouhal number Reynolds number vortex shedding drag crisis CFD validation benchmark <p dir="ltr">Curated literature-compiled benchmark dataset for two-dimensional bluff-body crossflow. 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). Version 1.5.0 also repairs a historical column shift in four rows (cir_002-cir_005) of the circular-cylinder table (no numeric value was touched), and version 1.4.0 augments the medium-Reynolds-number mild-ellipticity layer from 56 to 66 records by filling its lift-coefficient gap over Re = 100 to 1.2e3.</p><p><br></p><p dir="ltr">Data compiled from published literature; original sources retain copyright. Uncertainty and quality flags are provided per record; see the included data dictionary (metadata/data_dictionary.md). Figure-digitised rows are flagged quality_flag = low or medium and are recommended for re-verification before safety-critical use. Released under CC BY 4.0.</p><p><br></p> 2026-09-24T23:06:30Z Dataset Dataset 10.6084/m9.figshare.33991126.v1 https://figshare.com/articles/dataset/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/33991126 CC BY 4.0