`fdm`¶

Finite difference input.

Note

fdm is required if macros coor are elem are not used.

Group 1 - KEYWORD
Group 2 - MODCHAR (only if KEYWORD is “modf”)

or

Group 2 - NX, NY, NZ (if KEYWORD is “block” or “poin”)
Group 3 - X0, Y0, Z0 (only if KEYWORD is ‘block)
Group 4 - MB, COORDINATE (X, Y or Z) (if KEYWORD is “poin”)

or

Group 4 - MB, SPACING (DX, DY, DZ) (if KEYWORD is “bloc”)

Group 4 is repeated for each NX, NY, and NZ, i.e., all X data are input, followed by Y data, followed by Z data for each division terminated by a blank line.

Input Variable	Format	Description
KEYWORD	character*4	Keyword indicating format of finite difference input to follow (“block”, “poin”, or “modf”).
MODCHAR	character*132	If the keyword is “modf”, the name of a modflow geometry data file is input and the finite difference input is read from that file and no other data is input.
NX	integer	Number of divisions in the x direction.
NY	integer	Number of divisions in the y direction.
NZ	integer	Number of divisions in the z direction.
X0	real	Coordinate of x origin point (m).
Y0	real	Coordinate of y origin point (m).
Z0	real	Coordinate of z origin point (m).
X	real	X coordinate (m).
Y	real	Y coordinate (m).
Z	real	Z coordinate (m).
DX	real	Node spacing in the x direction (m).
DY	real	Node spacing in the y direction (m).
DZ	real	Node spacing in the z direction (m).
MB	integer	Division number. If the division number is negative the code will space each divison from the previous to the current proportional to the assigned spacings.