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xfoil_do - XFOIL 6.94 User Primer THE last update 6 Dec...

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XFOIL 6.94 User Primer THE last update 6 Dec 2001 Mark Drela, MIT Aero & Astro Harold Youngren, Aerocraft, Inc. General Description =================== XFOIL is an interactive program for the design and analysis of subsonic isolated airfoils. It consists of a collection of menu-driven routines which perform various useful functions such as: - Viscous (or inviscid) analysis of an existing airfoil, allowing * forced or free transition * transitional separation bubble(s) * limited trailing edge separation * lift and drag predictions just beyond CLmax * Karman-Tsien compressibility correction - Airfoil design and redesign by interactive specification of a surface speed distribution via screen cursor or mouse. Two such facilities are implemented. * Full-Inverse, based on a complex-mapping formulation * Mixed-Inverse, an extension of XFOIL's basic panel method Full-inverse allows multi-point design, while Mixed-inverse allows relatively strict geometry control over parts of the airfoil. - Airfoil redesign by interactive specification of new geometric parameters such as * new max thickness and/or camber * new LE radius * new TE thickness * new camber line via geometry specification * new camber line via loading change specification * flap deflection * explicit contour geometry (via screen cursor) - Blending of airfoils - Drag polar calculation with fixed or varying Reynolds and/or Mach numbers. - Writing and reading of airfoil geometry and polar save files - Plotting of geometry, pressure distributions, and polars (Versaplot-derivative plot package used) XFOIL is best suited for use on a good workstation. A high-end PC is also effective, but must run Unix to support the X-Windows graphics. The source code of XFOIL is Fortran 77. The plot library also uses a few C routines for the X-Windows interface. History ------- XFOIL 1.0 was written by Mark Drela in 1986. The main goal
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was to combine the speed and accuracy of high-order panel methods with the new fully-coupled viscous/inviscid interaction method used in the ISES code developed by Drela and Giles. A fully interactive interface was employed from the beginning to make it much easier to use than the traditional batch-type CFD codes. Several inverse modes and a geometry manipulator were also incorporated early in XFOIL's development, making it a fairly general airfoil development system. Since version 1.0, XFOIL has undergone numerous revisions, upgrades, hacks, and enhancements. These changes mainly originated from perceived shortcomings during actual design use, so XFOIL is now strongly geared to practical airfoil development. Harold Youngren provided the Xplot11 plot package which is a vast improvement over the grim Versaplot-type package used initially. Enhancements and suggestions from Youngren and other people were also incorporated into XFOIL itself along the way.
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