NAME
mgenrad - SUTRA utility program to generate a simple mesh
ABSTRACT
MGENRAD is an auxiliary program to generate several major data sets
for SUTRA. It can be used to generate the nodewise records (data
set 14B), elementwise records (data set 15B), and element-incidence
records (data set 22). MGENRAD assumes: (1) a two-dimensional
rectangular mesh in cylindrical coordinates (R=radius, Z=elevation)
composed of rectangles that increase in size with distance from the
center axis, and (2) constant parameter values throughout the mesh
region. The generated data sets can be modified manually to obtain
irregular elements, irregular regions, or non-constant parameters.
The mesh consists of rectangular-cylindrical elements. These may be
visualized as rectangles that are swept through a 360 degree
rotation about the center axis. In the vertical direction, the
nodal spacing is constant. In the radial direction, element size
increases with each column of elements by a constant factor
beginning with the smallest element size in the column nearest the
center axis. Element size increases until either the radial
boundary is reached or the maximum specified element size is
achieved. In the latter case, once the maximum spacing is reached,
MGENRAD will generate columns of elements with constant radial size
equal to the specified maximum value until the external boundary is
reached. The column of elements nearest the axis may be positioned
at a specified distance from the axis.
DATA REQUIREMENTS
MGENRAD requires seven values to be input:
NR = Number of nodes along R-coordinate
NZ = Number of nodes along Z-coordinate
RL = Total mesh length along R
ZL = Total mesh length along Z
RW = Radial distance to first node (well radius)
DRMIN = Shortest radial distance between nodes
DRMAX = Longest radial distance between nodes
These values are read, free-format, from the standard input unit
(normally the keyboard). By free-format it is meant that values may
be input in any columns as long as they are input in order (i.e.,
NR, NZ, RL, RW, ZL, DRMIN, DRMAX); they are valid (integer values
for NR and NZ, floating point values for RL, ZL, RW, DRMIN, and
DRMAX); and a blank(s), a comma, or a carriage return separates each
value.
OUTPUT OPTIONS
MGENRAD creates the file MESHOUT.DAT in the user's current
directory.
DOCUMENTATION
This program is provided without documentation.
CONTACTS
Operation:
U.S. Geological Survey
Office of Hydrologic Research
Clifford I. Voss
431 National Center
Reston, VA 20192
cvoss@usgs.gov
Distribution:
U.S. Geological Survey
Hydrologic Analysis Software Support Program
437 National Center
Reston, VA 20192
h2osoft@usgs.gov
Official versions of U.S. Geological Survey water-resources analysis
software are available for electronic retrieval via the World Wide
Web (WWW) at:
http://water.usgs.gov/software/
and via anonymous File Transfer Protocol (FTP) from:
water.usgs.gov (path: /pub/software).
The WWW page and anonymous FTP directory from which the SUTRA
software can be retrieved are, respectively:
http://water.usgs.gov/software/sutra.html
--and--
/pub/software/ground_water/sutra
If you would like to obtain the price of and (or) order paper copies
of USGS reports, contact the USGS Branch of Information Services at:
U.S. Geological Survey
Branch of Information Services
Denver Federal Center, Box 25286
Denver CO 80225-0286
To inquire about Open-File Reports or Water-Resources Investigations
Reports:
Tel: 303-202-4210; Fax 303-202-4695
To inquire about other USGS reports:
Tel: 303-202-4700; Fax 303-202-4693
SEE ALSO
mgenrec(1) - SUTRA utility program to generate a simple mesh
pbcgen(1) - SUTRA utility program to generate hydrostatic
pressure
sutra(1) - Saturated and (or) unsaturated, constant or
variable-density fluid flow, and solute or energy
transport (2-dimensional finite-element code)
sutraplt(1) - Graphics postprocessor program for SUTRA