# Grid rectangular.f90 - Calculation of grid

```
!Sample program for solving Lid-driven cavity flow test using SIMPLE-algorithm
! calculation of grid modul
!Copyright (C) 2016  Michail Kiričkov, Kaunas University for Technology
!
!This program is free software; you can redistribute it and/or
!modify it under the terms of the GNU General Public License

!This program is distributed in the hope that it will be useful,
!but WITHOUT ANY WARRANTY; without even the implied warranty of
!MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
!GNU General Public License for more details.

!You should have received a copy of the GNU General Public License
!along with this program; if not, write to the Free Software
!Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.

!**********************************************************************
Subroutine Grid_rectangular
include 'icomm_1.f90'

x=0.
y=0.
SLx = 1.
SLy = 1.
Xbeg =  0.
Ybeg =  0.
NXmax =  80
NYmax =  80
NXmaxC =  NXmax + 1
NYmaxC =  NYmax + 1
N_centr = ( NXmax + 1 )/2 +1
!----------------------------------------------------------
DO 2 I=1, NXmax
DO 2 J=1, NYmax
X(I,J) = Xbeg + (SLx /(NXmax-1))* (i-1)
2     continue

DO 3 J=1, NYmax
DO 3 I=1, NXmax
Y(I,J) = Ybeg + (SLy /(NYmax-1))* (j-1)
3     continue
!----------------------------------------------------------
open (22,file='GRID.dat')
WRITE(22,*)'VARIABLES = "X", "Y" '
WRITE (22,*)' ZONE I=' ,NXmax, ', J=', NYmax, ', F=POINT'

DO 1 J=1, NYmax
DO 1 I=1, NXmax
WRITE (22,*) X(I,J), Y(I,J)
1     continue

open (21,file='GRID.txt')
write(21,*) NYmax,NXmax
DO 4 J=1, NYmax
DO 4 I=1, NXmax
WRITE (21,*) X(I,J), Y(I,J)
4     continue

close(21)

Return
End

```