fanno-flowlisted

# Fanno Flow in a Constant-Area Adiabatic Duct (aerodynamics/high-speed/fanno-flow) Use when the task is the Fanno flow of a steady adiabatic perfect-gas flow in a constant-area duct with wall friction: the Fanno-line integral fL*/D, the friction-duct choking length, the downstream Mach number recovered on the inlet branch for a given friction parameter, the friction required to choke a duct of given length and diameter, and the total-pressure and static ratios along the duct to its sonic reference state. This leaf implements the standard Fanno relations (the same compressible-flow framework that NACA TR-824 tabulates) in pure Python, stdlib only, with a deterministic 1-D bisection for the branch inversion. It pairs with aerodynamics/high-speed/isentropic-flow-relations as the frictionless complement (that leaf's area-Mach and choked mass flow have no wall-friction term and no Fanno line), with aerodynamics/high-speed/normal-shock for shock-jump stagnation loss at a station, and with aerodynamics/high-speed/shock-tube, which supplies the deterministic-bisection precedent. It does NOT do Rayleigh heat-addition flow of a frictionless duct (rayleigh-flow, same wave; friction with heat addition is out of scope), boundary-layer skin friction and heating on surfaces (flat-plate-skin-friction-heating), or the unsteady shock-tube wave system (shock-tube). ## Domain quick reference - Fanno-line integral: phi(M) = fL*/D = (1 - M^2)/(gamma M^2) + ((gamma + 1)/(2 gamma)) ln((gamma +