Numerical calculation of transonic flow about swept wings

Transonic flow potential method development at Ames research center

“…The Murman-Cole algorithm ''switches" the differencing type from central to upwind or vice versa as dictated by the local Mach number, maintaining stable operation for transonic flows-even those with strong shocks. At Ames, this idea was extended to axisymmetric bodies by Bailey [7] and Krupp and Murman [8], and to three-dimensional applications by Bailey and Steger [9] and Ballhaus and Bailey [10]. In all these applications, the nonconservative form of the TSD equation was used.…”

CFD technology development at NASA Ames - A mission computing perspective

“…Small disturbance, potential and boundary layer codes: -Bailey-Ballhaus code: Solves modified small disturbance approximation of the full potential equation (Ballhaus and Bailey, 1972). -LTRAN2: Solves unsteady, two-dimensional, non-linear, small-disturbance transonic flow equation (Ballhaus and Goorjian, 1977).…”

Missile Aerodynamics - Past, Present, Future

“…These data are compared with the Euler code prediction in Fig. lOb The calculation of wing characteristics at transonic speeds for both steady and unsteady flow, as exemplified by the work of Ballhaus, Bailey, and Frick, 56 has been much advanced in recent years through high-speed computers. While results for low angles of attack have been gratifying, the efforts in this area are still in an early stage of development for high angles of attack.…”