version: "1.0.0" name: aerodynamics description: "Use when a task concerns aerodynamics: guide the router to the aerodynamics pack: airfoil-selection family choice, xfoil-analysis polars, airfoil-geometry NACA geometry, airfoil-optimization shape trade, cfd-convergence residuals, cfd-turbulence-modeling model selection, cfd-mesh-generation grids and y-plus, vortex-lattice-method VLM, panel-method potential flow, normal-shock shock relations, oblique-shock theta-beta-M, prandtl-meyer expansions, swept-wing-aerodynamics sweep, transonic-similarity Karman-Tsien, supercritical-airfoil aft loading, wave-drag-area-rule area rule, drag-polar polar, parasite-drag zero-lift drag, lift-curve-slope lift slope, boundary-layer-theory flat-plate layers, ground-effect in-ground lift, high-lift-systems flap and slat clmax. Trigger: aerodynamics, airfoil, polar, drag polar, sweep, Mach, boundary layer, ground effect, high lift, vortex lattice, panel method, transonic." license: Apache-2.0 compliance: STANDARDS-REF standards:

• id: naca-tr-824

reference-only: true gated: false domain: aerodynamics pack: aerodynamics compatibility: "agentskills.io SKILL.md; router/entry point for the aerodynamics domain pack" metadata: domain: aerodynamics tags: [] version: 0.1.0 author: Aero Agent Skills

Aerodynamics domain pack (router)

Route here when the task is aerodynamic analysis, airfoil selection, compressible flow, or validation of section data.

Domain

Aerodynamics and CFD: airfoil section selection, geometry, and analysis with XFOIL, viscous-inviscid modeling, turbulence modeling, compressible flow (normal and oblique shocks, Prandtl-Meyer expansions), drag polar construction, and wing lift curve slope estimation, validated against classic reference data.

Sub-skills in this pack

Routing guidance

• Airfoil family and section constraint questions route to the

airfoil-selection sub-skill; XFOIL runs and polar validation route to xfoil-analysis; NACA geometry and naming questions route to airfoil-geometry; shape trade and - Cfd validation questions route to the cfd cfd-validation sub-skill. objective studies route to airfoil-optimization.

• CFD solver-convergence questions (residuals, Courant, mesh

refinement) route to cfd-convergence; turbulence model and near-wall questions route to cfd-turbulence-modeling; grid type, prism layer, and first-cell-height questions route to cfd-mesh-generation; potential-flow and lift-distribution methods route to vortex-lattice-method and panel-method.

• Compressible-flow questions (Mach number, normal shock relations,

stagnation pressure loss) route to the high-speed normal-shock sub-skill; oblique shock and turning questions (theta-beta-M, deflection angle, weak/strong solution) route to oblique-shock; expansion-fan questions (Prandtl-Meyer angle, downstream Mach) route to prandtl-meyer.

• Sweep, transonic scaling, wave drag, and critical Mach questions

route to swept-wing-aerodynamics, transonic-similarity, supercritical-airfoil, and wave-drag-area-rule.

• Drag polar construction and peak lift-to-drag questions route to

the drag-polars drag-polar sub-skill; zero-lift drag buildup and wetted-area parasite drag questions route to parasite-drag; wing lift curve slope questions (thin airfoil, aspect ratio, sweep, Mach correction) route to lift-curve-slope.

• Boundary layer thickness, transition, and skin friction questions

route to boundary-layer-theory; in-ground-effect performance questions route to ground-effect; flap and slat clmax and stall speed questions route to high-lift-systems.

• Wing planform reference geometry, root and tip chord, mean aerodynamic chord, taper ratio, and spanwise loading questions route to the wing-design wing-planform-design sub-skill.
• Divergence dynamic pressure, torsional stiffness, aerodynamic center offset, and divergence margin questions route to the aeroelasticity divergence-speed sub-skill.
• Structural, control, and certification questions route to their

domain packs (structures, gnc-autonomy, avionics).

• Wind tunnel test data reduction, tare, blockage, and wall interference corrections, and coefficient uncertainty estimation route to the wind-tunnel windtunnel-data-reduction sub-skill.
• Classical wing flutter of the two-DOF typical section, the V-g method, structural damping crossing, frequency coalescence, and flutter margin questions route to the aeroelasticity flutter-speed-prediction sub-skill.
• Hypersonic flow questions (hypersonic flow, modified newtonian theory, newtonian impact pressure, stagnation pressure coefficient, blunt body drag, cone axial force) route to the hypersonic-flow sub-skill.
• Wind tunnel model design questions (wind tunnel model design, model scale selection, blockage ratio, reynolds mismatch, force balance rating, sting sizing) route to the wind-tunnel-model-design sub-skill.
• Hypersonic stagnation heating questions (aerodynamic heating, Sutton-Graves heat flux, radiation equilibrium temperature, nose radius bluntness) route to the high-speed aerodynamic-heating sub-skill.
• Laminar-turbulent transition location questions (transition location, Thwaites integral, Michel criterion, natural transition) route to the boundary-layer boundary-layer-transition sub-skill.

• Delta-wing vortex-lift questions (leading edge suction analogy, slender delta wing, Polhamus vortex lift) route to the cfd delta-wing-vortex-lift sub-skill.
• Boundary-layer separation questions (Thwaites lambda criterion crossing minus 0.09, Stratford pressure-recovery criterion, laminar separation point, turbulent separation station, separation margin) route to the boundary-layer boundary-layer-separation sub-skill.
• Profile-drag questions (Squire-Young formula from the trailing-edge momentum thickness and edge-velocity ratio, laminar profile drag from the integral growth chain, Blasius flat-plate reduction) route to the boundary-layer squire-young-profile-drag sub-skill.
• Flat-plate surface skin heating questions (recovery factor, adiabatic wall temperature, cold wall heat flux, reference temperature method skin friction, non-stagnation heating) route to the high-speed flat-plate-skin-friction-heating sub-skill.
• shock-tube diaphragm pressure ratio, incident-shock Mach number, contact-surface velocity, expansion fan questions route to the high-speed shock-tube sub-skill.
• camber-line glauert sine series, zero-lift angle, quarter-chord pitching moment, section lift coefficient questions route to the airfoil thin-airfoil-section-theory sub-skill.
• shear-driven high-Mach plate gap, Crocco energy integral, recovery factor, wall shear and heat flux questions route to the high-speed compressible-couette-flow sub-skill.

Install

To install only this pack, copy or symlink each leaf folder above into your host's skills directory (see README Install for per-host commands).

• Wind tunnel wall and blockage correction questions route to the wind-tunnel windtunnel-wall-corrections sub-skill.
• Dynamic indicial gust response and magnification-factor questions route to the aeroelasticity aeroelastic-gust-response sub-skill.
• Frequency-domain gust questions (Sears function gain and phase versus reduced frequency, sinusoidal-gust unsteady lift on the rigid airfoil, gust-load amplitude against the quasi-steady reference) route to the aeroelasticity sears-function-gust-lift sub-skill; discrete-gust time-domain response stays with aeroelastic-gust-response.
• Shock-expansion surface-pressure integration and wave-drag questions route to the high-speed shock-expansion-airfoil sub-skill.
• Winglet sizing, tip-device induced-drag reduction, effective-aspect-ratio gain, and root bending moment penalty questions route to the wing-design winglet-design sub-skill.
• Blunt-nose detached bow-shock standoff questions (standoff ratio and shock-layer thickness on the stagnation streamline for sphere and cylinder noses from the Billig-form correlations) route to the high-speed bow-shock-standoff sub-skill.

• Rough-surface skin friction questions (sand-roughness regime classification, fully-rough turbulent skin friction, roughness trip criterion) route to the boundary-layer rough-wall-skin-friction sub-skill.

• Low-speed stagnation-point boundary layer questions (Hiemenz 2-D and Homann axisymmetric similarity, stagnation velocity gradient from body radius, wall shear and skin friction at a spinner, radome or leading edge) route to the boundary-layer stagnation-flow-boundary-layer sub-skill.
• Axisymmetric boundary-layer questions (Mangler transformation to an equivalent 2-D flow, sharp-cone thickness and wall-shear ratios against the flat plate, slender body-of-revolution laminar layer) route to the boundary-layer mangler-axisymmetric-transform sub-skill.
• Isentropic flow relation questions (total to static ratios from Mach number, Mach from a given area ratio on the subsonic or supersonic branch, choked mass flow at a sonic throat) route to the high-speed isentropic-flow-relations sub-skill.
• Shock-reflection questions (incident oblique shock impinging on a wall or symmetry plane, reflected shock turning the flow back parallel, regular versus Mach reflection verdict from the detachment limit) route to the high-speed regular-shock-reflection sub-skill.
• Fanno flow questions (adiabatic constant-area duct with friction, fL star over D integral, choking length, downstream Mach from a given friction length) route to the high-speed fanno-flow sub-skill.
• Rayleigh flow questions (constant-area frictionless duct with heat addition, thermal choking, maximum heat addition, rayleigh-line ratios) route to the high-speed rayleigh-flow sub-skill.
• Linearized supersonic thin-airfoil questions (Ackeret pressure coefficient, biconvex wave drag, supersonic lift curve slope) route to high-speed ackeret-linearized-supersonic; Lighthill piston-theory surface pressure (small-perturbation unsteady hypersonic surfaces) routes to high-speed hypersonic-piston-theory; added/virtual mass coefficient questions (accelerating bodies in inviscid flow) route to aeroelasticity added-mass-coefficients-potential-flow; steady low-Reynolds creeping flow sphere drag (Stokes drag, Oseen correction, terminal velocity) routes to boundary-layer stokes-creeping-flow-drag.
• Unsteady laminar Stokes layer questions (impulsively started plate, oscillating plate penetration depth, Stokes first and second problem velocity profiles and wall shear) route to the boundary-layer unsteady-laminar-stokes-layers sub-skill.
• Laminar far-wake questions (Goldstein similarity wake behind a flat plate, centerline defect decay, wake half-width growth, wake-momentum-integral drag from a velocity-defect traverse) route to the boundary-layer laminar-far-wake sub-skill.