This is the AVL source deck avl-dist, *************************************************************************** AVL V2.5, dated 8-5-96 HHY This source has been updated to match the Xplot10-4.3 plot library. This version has a number of fixes over older versions, including: Bug fix on chord angles on tapered, twisted panels. Bug fix on hinge line vector to make both real and image hinge rotations in the same sense. The user can specify a CL or CM with "cl" or "cm" rather than 999. or -999 The Mach number is now a menu item (regenerates matrices for each new Mach) The getvm.f module now dumps the shear (Vz) and moment Myy for each panel. This version does not include any drag polar interpolation or the INDRAG drag calculation. See avl-polartrp for these... *************************************************************************** AVL 2.70, dated 2-24-97 HHY Massive rewrite of AVL: Completely new geometry plotting with many display options. Fixes to hidden line routines. Eliminated old lame loading plots Updated Trefftz plane plots Auto-image generation in main Option menu that generates an image half for cases with IYsym=1. Matrix solution completely revised to take full advantage of symmetry for 4x increase in speed for symmetric cases where the image side is generated with the auto-image option. Section viscous drag can now be included and summed into forces. A CD(CL) polar can be defined for each section based on 6 pairs of CL,CD points in the polar. Angular rates can be specified in either Stabilty axes or Body axes. Forces can be resolved in NASA Stability axes or Geometric Stability axes. Options are added to select the axes used for rates and forces. Comments starting with ! are recognized in the input deck to make datasets more self documenting. The ambiguity of what SREF refers to is resolved by making SREF refer to both sides of a symmetric configuration (IYsym=1) rather than half the total area as used in previous AVL versions. NOTE THAT YOU WILL HAVE TO DOUBLE THE SREF FOR OLDER DATASETS with IYSYM=1. *************************************************************************** AVL 2.76, dated 5-4-98 HHY Fixes and changes motivated by Ming Chang @ LMSW Added CMLE for strip to get hinge moments changes to output routines for printed data FS strip,FT total,FE element updated selection menu for surfaces fixed CDvisc linearization with dCDv/dCL term from CDCL routine *************************************************************************** AVL 2.77, dated 5-22-98 HHY Several problems were noted with winglets and the displayed surface forces in local reference coordinates. This prompted a bunch of changes and updates: Rehash of forces calculation in AERO started going to calculating body axes forces and then transforming to local systems using direction dot products (less confusing) added locally referenced surface CL,CD,CMLE new treatment for calculating local CL,CD for strips & surfaces Changed surface CMLE calculation fixed (properly) strip CN,CA to properly reflect X chordline (may want to add incidence to the axial direction eventually) strip CD(CL) fixed to use proper local CL rather than CL component in global system (affected winglets and dihedraled surfaces) New output routine to separate surface by surface forces listing from the total forces output. Added print flags for controling output print from these new options. Added option of displaying current hinge settings using ? input on command line when entering hinge data. Biggish changes to aplotccl.f to plot Trefftz data vs either Y or Z added user-specified plot limits fixed bug for -Y scale on plotting (axis was improperly shifted) Changed colors a bit in aplotvl.f to accentuate loadings better in plots. Note that there appears to be compiler bug using g77-0.5.21 on hidden.f, you might want to use f2c to compile this routine to avoid this bug (which appears as random line segments appearing in foreground surfaces from background lines. None of the other compilers appear to have this problem... *************************************************************************** AVL 2.78, dated 7-5-98 MD Fixed a bug in the stability-derivative calculation. Hinge angles can now be changed either directly as before, or indirectly by perturbing the control variables... delta_a delta_t delta_e delta_a delta_r delta_f which influence the hinge angles via the new "CONTROL" keyword declaration for a surface. See the avl.doc manual for details. Eliminated the SLOPE keyword capability, which has never been used as far as I can tell. Added control-deflection derivatives to the stability-derivative output, so that quantities like Cmde = d(Cm)/d(delta_e) are displayed. It is no longer necessary to generate these by manually perturbing each control surface and finite-differencing the forces. Added design variables, which currently represent virtual twists added to one or more sections. Sensitivities of CL, CD, etc to these design variables can be displayed. The intent is to give some guidance to span load optimization. Added hot-key rotation capability to the Geometry plot menu. *************************************************************************** AVL 2.81 7 June 03 MD Major revisions for new 2.8x series... Changed CONTROL definitions to be associated with sections. These modify the camberline via control variables defined entirely by the used. The built-in control variables delta_a, delta_e, etc., have been eliminated. The user specifies the name of each control variable. General trimming capability has been added, including the ability to drive control variables to achieve trim. Constraints are selected from a general sub-menu. Hinge stuff has been removed, since it's somewhat redundant with the new control stuff -- putting the control hingeline at 0% chord will rotate the whole surface just like the previous hinge feature. Design parameters are now input one per DESIGN declaration, and the user can specify the design parameter name. --------------------------------- AVL 2.82 (minor tweaks on 2.81) 13 Jun 03 MD Re-organized some of the menus. Fixed a few typos in the menus, the user manual, and the session.txt file. *************************************************************************** AVL 3.00 22 Sep 03 MD Very major revision for 3.0x series... Added finite core radius option to mostly eliminate hassles with alignment of trailing vortices with downstream surface paneling. Forces are computed not only on the bound vortex legs, but also on the parts of trailing legs which lie on the physical surface. This mainly affects the rolling moment due to sideslip. Added body modeling via source+doublet lines. These affect the vortex lattice circulations via their volume velocity fields. They also see direct forces and moments via slender-body theory. It's not yet clear how useful this modeling capability will be. Errors in the input file will now produce much better diagnostic messages than before. The offending line and line number are displayed. Added general operating state calculation interface. Variables consisting of alpha, beta, rotation rates, and control deflections can be either imposed explicitly, or computed implicitly via imposed force or moment coefficients. Trim states can thus be easily computed. Multiple operating run cases can be defined and saved to a file for later recall. This allows easy re-running of cases after a geometry modification, say. Geometry plot has been improved, with x,y,z space axes added. ------------------------------------------ AVL 3.01 10 Jan 04 MD Added a flight dynamics mode calculation and display module. This requires mass and inertia data, which is read from a file, or input manually. Using the mass file also provides other necessary dimensional data, such as the air density and the gravitational acceleration, and allows declaration of working units which can differ from those used to define the geometry and masses. ------------------------------------------ AVL 3.11 6 May 04 MD OPER now allows easy setup of trim states in level or banked horizontal flight (C1 sub-menu), or in planar looping flight (C2 sub-menu). Added multiple-case parameter input capability to the C1,C2 sub-menus in OPER, and the M sub-menu in MODE. Multiple cases are targeted by typing the parameter command twice (see manual). Additional parameters can be varied in root-locus sweeps, in particular the reference (CG) location, and the mass and inertias. Added camera pan/no-pan option to the eigenmode viewer in MODE. ------------------------------------------ AVL 3.13 21 May 04 MD Added the optional CLAF surface-section parameter, which allows changing the effective section dcl/da to something other than 2 pi to better represent thick airfoils. ------------------------------------------ AVL 3.15 8 Oct 04 HY, MD Changed subroutine name GETLOG to GETLGV to avoid intrinsic-function name conflict on some compilers. Changed subroutine name SECOND to TSECOND to avoid intrinsic-function name conflict on some compilers. Added commented-out code which calls SECNDS function rather than the current call to the CLOCKX subroutine (at bottom of aplotmd.f). The SECNDS function is used on some Fortran implementations. Fixed a minor bug in the a.i.c. Jacobian calculation (no perceivable effect on solution). Fixed some filename parsing problems at top level. ------------------------------------------ AVL 3.16 10 Mar 05 MD Fixed minor problem with handling of nonzero specified yaw moment (hardly used) Moved force evaluation points on bound vortices from the midpoints to the uniform/cosine/sine/ interpolation points. This makes the near-field and Trefftz-Plane drags nearly identical. The force evaluation points are now plotted along with the control points in the Geometry plot submenu in OPER. ------------------------------------------ AVL 3.18 22 Aug 05 MD Fixed a program-flow logic bug: When a new .avl file was LOADed, its velocity-influence coefficients used for force calculations were not being properly recalculated. Fixed bug in the design-variable implementation. Assigned values weren't being properly incorporated into the calculation. Added a CY (sideforce) constraint to the list of available constraints. This might be used to constraint beta in a knife-edge flight situation. Added note to avl_doc.txt on vortex spacing refinement and accuracy. Item 4) in "Vortex Lattice Spacing Distributions" section. ------------------------------------------ AVL 3.19 7 Sep 05 MD Fixed a minor bug in the Trefftz forces for y-symmetric cases. The Y-force CYTOT wasn't zeroed out like it should be. ------------------------------------------ AVL 3.20 24 Oct 05 MD Fixed error in printout of r'b/2V value. Its transformation to stability axes wasn't correct. There was no effect on the other displayed quantities. ------------------------------------------ AVL 3.21 25 Oct 05 MD Fixed error in printout of Cl,Cn moments for large alpha values. The transformation to stability axes wasn't correct.