Welcome to my software page. I have Pascal and C code on this page in zip files for download. There is a description for each zip file and what each piece of code can be used for.

PANELS is a Pascal program that
computes the pressure coefficients about any airfoil using the source panel
method. It takes as input any airfoil or shape in a standard x,y format.
For an example of this format, please see the airfoils contained within
AIRFOIL
below. It will accept any coordinate file with up to 140 x,y points. You
may even have more than one airfoil in a single coordinate file. When run
, the program then goes through two important steps with the user. First,
it displays the airfoil(s) to the screen and asks the user to make sure
that the points are in a clockwise direction. This is important as the
code computes pressures to the outside of an airfoil. If the points were
counter-clockwise, the pressure coefficients would be computed on the inside
of the airfoil, and they would be useless. The next step displays the panels
connecting all of the points and asks the user to remove any panels that
are unwanted. The major reason for this capability is to remove the connecting
panel between two airfoils in a single plot (such as a biplane or canard
configuration). Once these two steps are complete, the program does the
rest.

If use wish to create flaps and attach them inside a coordinate file, ROTATE is another program included here that will be of help. This program takes the same type of input as above, and then allows the user to rotate that airfoil through any number of degrees clockwise or counter-clockwise. With this program, the user may create dropped flaps at any angle to see how they will change the pressure coefficients about an airfoil.

RTM.EXE is a Pascal runtime library, EGAVGA.BIN is a graphics run-time package, and BOLD.CHR is a font to be used by the program. Keep these three files in the same directory as PANELS.EXE and ROTATE.EXE.

AIRFOILS <-- click here to download

This zip file contains 20 airfoils in the standard x,y format. They can be used by any software package that plots and modifies airfoils, such as CompuFoil. They can also be used by PANELS. For more airfoils online, please try these sites:

http://amber.aae.uiuc.edu/~m-selig/ads/coord_database.html - Selig Airfoils

http://www.ozemail.com.au/~flyingwing/ - Flying Wing Airfoils

More software is available for airfoil plotting and modifications at these sites:

http://www.hanleyinnovations.com/

http://www.lerc.nasa.gov/Other_Groups/K-12/aerosim/

http://beadec1.ea.bs.dlr.de/Airfoils/foil_fw.htm

http://www.halcyon.com/bsquared/EH.html and http://www.halcyon.com/bsquared/Panknin.html

Composites computer is a C program that was written for a graduate composites class at UNLV. It is designed to compute the strengths in all directions of a layed-up composite. If you are familiar with composites, the S, Q, and ABD matrices will be easily recognized. The program takes either composites entered by hand and then saves them, or it will accept an input file in the form of the .lam files contained within this zip file. If you are working with composites and need these matrices and the strengths and strains that result from these matrices and loads placed upon them, this code will be of great help.

TOTSEC <- click here to download

These are two simple C programs.
DMS takes input at the command line and will convert latitude and longitude
from degrees minutes seconds to decimal degrees, and vice versa.
TOTSEC will take any number (in seconds) and return the total number of
days, hours, minutes and seconds from the beginning of the year.

TRANSFORMS <- click here to download

This is a C library of geographic
coordinate transformation routines. Included with the library is a small
test program to show how to use the subroutines.

EFG refers to universal, Earth
center, metric (meters) coordinates

LLA refers to latitude, longitude,
altitude (lat-long-alt)

AER refers to local azimuth, elevation,
range (az-el-range)

XYZ refers to local standard coordinate
plane

72 and 84 refers to the WGS 72
and WGS 84 Earth ellipsoids

__Subroutines included are:__

EFG84toLLA84 - converts from EFG
in WGS 84 to Lat-Long-Alt in WGS 84

LLA84toEFG84 - converts from Lat-Long-Alt
in WGS 84 to EFG in WGS 84

AERtoLLA84 - converts from local
az-el-range (in meters) to Lat-Long-Alt in WGS 84

EFG84toAER - converts from EFG
in WGS 84 to local az-el-range (in meters)

EFG84toEFG72 - converts from EFG
in WGS 84 to EFG in WGS 72

XYZtoAER - converts from local
XYZ to local az-el-range (meters in -> meters out, feet in -> feet out;
consistent units)

AERtoXYZ - converts from local
az-el-range to local XYZ (meters in -> meters out, feet in -> feet out;
consistent units)

return_dms - accepts decimal value
and returns the deg:min:sec representation

MATRIX <- click here to download

This is a C library of matrix utilities. Included with the library is a small test program to show how to use the subroutines.

__Subrountines included are:__

transpose - returns the transpose
of a matrix

matrix_multiply - multiplies two
conformable matrices

adjoint - returns the adjoint of
a square matrix

inverse - returns the inverse of
a square matrix

trace - returns the trace of a
square matrix

cofactor - returns the cofactor
of a square matrix from position row,column

det - returns the determinate of
a square matrix

minor - returns the minor of a
square matrix from position row,column

print_matrix - pretty print of
any size matrix

solution - this is a C version
of the Pascal code "Linear" below; it will give the
solution [X] of the equation [A][X]=[B] where [A] and [B] are known.
It handles tri-diagonal, sparse, and full arrays.

The following programs were written for MEG 777, High Performance Computational Science and Engineering, at UNLV.

LINEAR <- click here to download

This Pascal code can be used to solve a linear system of equations. These equations are in the form [A] [X] = [B] where [A] is a (N x N) size array and [X] & [B] are (1 x N) arrays. It has partial pivoting algorithms included in the solver, and will solve tri-diagonal, sparse, and full arrays. In its current coding it will handle up to 100 variables. RTM.EXE is a Pascal run-time library that must be in the same directory as LINEAR.EXE . If you want a C version of this code, check out my C matrix utilities above.

CRANK <- click here to download

RK <- click here to download

chrisgood @comcast.net |
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