windtunnel-wall-correctionslisted

Use when you must apply closed-wall wind tunnel corrections to measured lift and drag coefficients: compute solid blockage from model volume over the test-section volume scale with K1 = 0.52, wake blockage from the uncorrected drag coefficient, total blockage, buoyancy drag increment from the streamwise pressure gradient, lift interference and streamline curvature alpha increment, sigma factor from span over section height, and first-order corrected lift and drag coefficients with corrected q and velocity. Produces corrected coefficients, alpha, q and V for free-air comparison. Trigger: wall corrections, solid blockage, wake blockage, wind tunnel boundary interference, lift interference, buoyancy drag, test section constraint, corrected drag coefficient.
ashfordeOU/aero-agent-skills · ★ 0 · AI & Automation · score 78

Install: claude install-skill ashfordeOU/aero-agent-skills

# Wind Tunnel Wall Corrections (aerodynamics/wind-tunnel/windtunnel-wall-corrections) Use when the task is correcting measured aerodynamic coefficients for the presence of the walls of a closed solid-wall (slotted or solid) test section, the classical low-speed correction set of Barlow, Rae and Pope (Low-Speed Wind Tunnel Testing, boundary corrections chapter, method set paraphrased here): solid blockage, wake blockage, horizontal buoyancy drag, and the lift interference and streamline curvature corrections. The input is a set of coefficients already reduced from raw balance readings at the measured dynamic pressure; the output is the wall-corrected polar an operator would compare with free-air or CFD data. Raw-run data reduction, tare subtraction, Reynolds and Mach corrections and uncertainty estimation belong to aerodynamics/wind-tunnel/windtunnel-data-reduction, not to this leaf. ## Domain quick reference Closed rectangular test section of cross-sectional area C (m^2) and height h, model of planform area S_model, volume V_model and span b. All corrections below are first order in the small blockage factors. - Solid blockage: eps_sb = K1 * V_model / C^1.5, with C^1.5 the cubic scale of the section (volume units) and K1 = 0.52 for a closed rectangular section (classical Barlow value, allow override with the tunnel-specific calibration). - Wake blockage: eps_wb = (S_model / (4 * C)) * CDu, with CDu the uncorrected drag coefficient at the uncorrected dynamic pressu