Viscous (or inviscid) analysis of an existing airfoil, allowing forced or free transition transitional separation bubbles limited trailing edge separation lift and drag predictions just beyond CLmax Karman-Tsien compressibility correction fixed or varying Reynolds and/or Mach numbers Airfoil design and redesign by interactive modification of surface speed distributions, in two methods: Full-Inverse method, based on a complex-mapping formulation Mixed-Inverse method, an extension of XFOIL's basic panel method Airfoil redesign by interactive modification of geometric parameters such as max thickness and camber, highpoint position LE radius, TE thickness camber line via geometry specification camber line via loading change specification flap deflection explicit contour geometry (via screen cursor) Blending of airfoils Writing and reading of airfoil coordinates and polar save files Plotting of geometry, pressure distributions, and multiple polars
Release Conditions XFOIL is released under the GNU General Public License. By downloading the software you agree to abide by the GPL conditions. The most important conditions are: You may copy, modify and redistribute XFOIL or its modifications freely. Any such redistributions must be done under the terms of the GPL, else the permission is withdrawn.AnnouncementsAn Xfoil electronic bulletin board has been created at YahooGroups. The intent is to exchange information on Xfoil and other aero software.
A Norwegian translation of this webpage has been createdby NTNU studentsSoftwarexfoil6.97.tar.gz (3972497 bytes) Xfoil 6.97 for Unix and Win32.Xfoil for Mac-OSX An independent 3rd-party build.Also at xfoil6.99.tgz (4515991 bytes) Xfoil 6.99 for Unix and Win32. Gzipped directory tar image. All source code, Orr-Sommerfeld database, plain text version of User Guide, sample Xfoil session inputs. Requires Fortran 77, C compilers, windowing support. XFOIL6.99.zip (3813300 bytes) Xfoil 6.99 for Windows.xfoilP3.zip (508267 bytes) Xfoil 6.94 executable for Win32, optimized for Pentium 3. xfoilP4.zip (531947 bytes) Xfoil 6.94 executable for Win32, optimized for Pentium 4. Pplot.zip (289812 bytes) Pplot executable for Win32 (optional separate polar save-file plotter). Pxplot.zip (281493 bytes) Pxplot executable for Win32 (optional separate polar dump-file plotter).
Note: The source code for Xfoil itself is the same for Unix and Win32. The plot library directory (plotlib) has a separate win32 subdirectory. See all the README files for more info. Win32 Notes: Interaction with Win32 XFOIL is through a DOS-type text console window. Some of Microsoft's Win32 OS'es (Win95/98/ME) have limitations on # of lines in a console window and cannot fully display XFOIL menus or output. Win95/98/ME also have other shortcomings with regard to resource usage and stability although XFOIL runs under these OS'es.Windows NT, Win2000 and Windows XP are the recommended Win32 platforms. Win32 Exe Notes: The executables for Win32 were compiled using the Intel Fortran Compiler 5.01-15 and Visual C++6.0. The Intel compiler (thanks to Tom Clarkson at Intel) was used to optimize executables for P3 and P4 Pentium architectures. The XFOIL executables should run on any Win32 Pentium-class machine as compiler options were used to include both optimized code and generic Pentium or AMD processor code for portability. Documentsxfoil_doc.txt (78602 bytes). User Guide in plain text.dataflow.pdf (11261 bytes). Data flow diagram.sessions.txt Sample Xfoil session inputs. version_notes.txt Summary of changes made for recent Xfoil versions.
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Data and software from various studies can bedownloaded from this site. This material has been developed under NSF grants SES-8720731, SES-8920752, SBR-9308301, SBR-9707771, andSES-0076072, and is freely available to the public.
Normalization. Download software to reproduce results from the paper Normalization in Econometrics coauthored with Dan Waggoner and Tao Zha. Flexible nonlinear inference. Download data and software to reproduce results from the papers "A ParametricApproach to Flexible Nonlinear Inference" and "What is an OilShock?" Click here to download copiesof the working papers. Click here for updated estimation results and tests for coefficient stability of regression of real GDP on net oil price increase using data through 2019.
Program design, addressing modes, subroutines, parameter passing, stacks, bit manipulation, text processing, DOS functions, macros, I/O, high level language interfaces. CMPSC 313CMPSC 313 Assembly Language Programming (3)This is a course in assembly language programming for IBM PCs and compatibles. Students will gain experience writing efficient, well-documented programs that are easily maintained. The course investigates the architecture and instruction set of a typical microcomputer based on the Intel 80x86 microprocessors. Topics include the basic structure of computers, the internal behavior of computers, program design, testing, debugging, machine architecture, addressing, BCD and binary arithmetic, subroutines and parameter passing, stacks, text processing, bit manipulation, DOS functions, macros, I/O routines, high level language interfaces and the assembly process.This course is important because assembly language is often used in programs where small size or fast execution is critical. Knowledge of assembly language is also useful in debugging programs written in high level languages. It also helps bridge the gap between hardware and high level languages.After successfully completing CMPSC 313, the student should be able to: explain the 80x86 architecture, including registers and segment:offset addressing; describe different ways data are represented in a computer and work with binary and hexadecimal numbers; describe the functions of an assembler; implement program designs in 80x86 assembly language, including: writing, documenting, testing and debugging a program in PC assembly language; manipulating strings; coding basic algorithms such as searching and sorting in assembly language; calling and passing parameters to subroutines; utilizing DOS functions; and interfacing with a high level language; explain how the underlying hardware affects software design and performance; appreciate the factors that contribute to program efficiency.Students will be evaluated on homework (35% of grade), semester exams (35%), and a final comprehensive exam (30%).The major only requires that a student have experience with assembly language programming. This course is intended for students who have not had any experience with assembly language programming before entering the program. It will also serve as an elective. The material learned in this course is beneficial in understanding concepts in the required courses CMPSC 422, CMPSC 472, and CMPSC 460, as well as in the elective courses CMPSC 428 and CMPSC 470.No special facilities are required for this course. The software necessary is available in the computer labs or for students to use at home. This course will be offered once per year, with an expected enrollment of 55.
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