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XTRAN2L - A PROGRAM FOR SOLVING THE GENERAL-FREQUENCY UNSTEADY TWO-DIMENSIONAL TRANSONIC SMALL-DISTURBANCE EQUATIONS
Author and Affiliation:
Seidel, D. A.
Abstract: The Program for Solving the General-Frequency Unsteady Two-Dimensional Transonic Small-Disturbance Equation, XTRAN2L, is used to calculate time-accurate, finite-difference solutions of the nonlinear, small-disturbance potential equation for two- dimensional transonic flow about airfoils. The code can treat forced harmonic, pulse, or aeroelastic transient type motions. XTRAN2L uses a transonic small-disturbance equation that incorporates a time accurate finite-difference scheme. Airfoil flow tangency boundary conditions are defined to include airfoil contour, chord deformation, nondimensional plunge displacement, pitch, and trailing edge control surface deflection. Forced harmonic motion can be based on: 1) coefficients of harmonics based on information from each quarter period of the last cycle of harmonic motion; or 2) Fourier analyses of the last cycle of motion. Pulse motion (an alternate to forced harmonic motion) in which the airfoil is given a small prescribed pulse in a given mode of motion, and the aerodynamic transients are calculated. An aeroelastic transient capability is available within XTRAN2L, wherein the structural equations of motion are coupled with the aerodynamic solution procedure for simultaneous time-integration. The wake is represented as a slit downstream of the airfoil trailing edge. XTRAN2L includes nonreflecting farfield boundary conditions. XTRAN2L was developed on a CDC CYBER mainframe running under NOS 2.4. It is written in FORTRAN 5 and uses overlays to minimize storage requirements. The program requires 120K of memory in overlayed form. XTRAN2L was developed in 1987.
Publication Date: Jan 01, 1994
Document ID:
19940002774
(Acquired Dec 28, 1995)
Accession Number: 94M10317
Subject Category: AERODYNAMICS
Report/Patent Number: LAR-13899
Document Type: Computer Program
Publisher Information: United States
Financial Sponsor: NASA Langley Research Center
Description: In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: No Copyright
NASA Terms: AERODYNAMICS; AEROELASTICITY; AIRFOILS; FINITE DIFFERENCE THEORY; FLUID FLOW; TRANSONIC FLOW; TRANSONIC FLUTTER; XTRAN2L
Other Descriptors: FORTRAN 77; CDC CYBER 170
Miscellaneous Notes: Approximately 5,530 source statements
Availability Source: Other Sources
Availability Notes: Program $800.00
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