SUBROUTINE VORTX1

c     Elaborado por Serguei A. Lonin, 1999-2000 Version 2.1, 2000

      INCLUDE 'COMML.FOR'
      epsp=0.0001
      MOL=0
      DO 19 I=1,M1
      DO 19 J=1,N1
      IF(KT.EQ.1)PSI(J,I)=PSI0(J,I)
      IF(H(J,I).EQ.PF)GOTO 19
      MOL=MOL+1
   19 CONTINUE
      TETA=1.
      L=0  
   35 L=L+1
      IF(L.GE.2000000)GOTO 325

      CALL BOUND

      DO 778 I=2,M
      DO 778 J=2,N
      IF(H(J,I).EQ.PF)GOTO 778
C     IF(H(J+1,I).EQ.PF.OR.H(J,I+1).EQ.PF.OR.H(J,I-1).EQ.PF
C    &.OR.H(J-1,I).EQ.PF)GOTO 778
C     IF(H(J+1,I+1).EQ.PF.OR.H(J-1,I+1).EQ.PF.OR.H(J+1,I-1).EQ.PF
C    &.OR.H(J-1,I-1).EQ.PF)GOTO 778
      DDT=(AFV(J,I)+AFV(J-1,I)-AFV(J,I-1)-AFV(J-1,I-1)
     &-AFU(J,I)-AFU(J,I-1)+AFU(J-1,I)+AFU(J-1,I-1))

      A1=RK(J,I)*HL1(J,I)/HL2(J,I)/H1(J,I)
      A4=RK(J,I-1)*HL1(J,I-1)/HL2(J,I-1)/H1(J,I-1)
      A8=RK(J-1,I)*HL1(J-1,I)/HL2(J-1,I)/H1(J-1,I)
      A9=RK(J-1,I-1)*HL1(J-1,I-1)/HL2(J-1,I-1)/H1(J-1,I-1)
      B4=YL*HH1(J+1,I)/HH2(J+1,I)/H(J+1,I)
      B8=YL*HH1(J-1,I)/HH2(J-1,I)/H(J-1,I)
      G1=RK(J,I)*HL2(J,I)/HL1(J,I)/H1(J,I)
      G2=RK(J-1,I)*HL2(J-1,I)/HL1(J-1,I)/H1(J-1,I)
      G6=RK(J,I-1)*HL2(J,I-1)/HL1(J,I-1)/H1(J,I-1)
      G7=RK(J-1,I-1)*HL2(J-1,I-1)/HL1(J-1,I-1)/H1(J-1,I-1)
      O2=YL*HH2(J,I+1)/HH1(J,I+1)/H(J,I+1)
      O6=YL*HH2(J,I-1)/HH1(J,I-1)/H(J,I-1)

      PSI1=((G2+G1)*PSI0(J,I+1)+(G7+G6)*PSI(J,I-1)+
     & (A4+A1)*PSI0(J+1,I)+(A9+A8)*PSI(J-1,I)+
     & 0.5*(B4*(PSI0(J+1,I+1)-PSI0(J+1,I-1))-B8*(PSI0(J-1,I+1)-
     & PSI(J-1,I-1))-O2*(PSI0(J+1,I+1)-PSI0(J-1,I+1))+
     & O6*(PSI0(J+1,I-1)-PSI(J-1,I-1)))-HAG*DDT)/         ! DOESN'T DIVIDE BY 2 AND ONE HAG!
     & (G1+G2+G6+G7+A1+A4+A8+A9)

      PSI(J,I)=TETA*PSI1+(1.-TETA)*PSI0(J,I)
 778  CONTINUE

      CALL VELCTY
      CALL FRIC
      CALL RHS

      if(L.eq.1)go to 35
      KAP=0
      DO 97 I=1,M1
      DO 97 J=1,N1
      IF(H(J,I).EQ.PF)GOTO 97
      IF(PSI0(J,I).EQ.0..AND.PSI(J,I).EQ.0.)GOTO 322
      IF(ABS((PSI(J,I)-PSI0(J,I))/(PSI0(J,I)+0.1E-09)).GT.EPSP)GOTO 97
 322  KAP=KAP+1
  97  CONTINUE
      DO 2 I=1,M1
      DO 2 J=1,N1
      IF(H(J,I).EQ.PF)GOTO 2
      PSI0(J,I)=PSI(J,I)
   2  CONTINUE
      IF(KAP.EQ.MOL)GOTO 444
      IF(L/ITER1*ITER1.EQ.L)WRITE(*,*)
     &'Acercamiento esta en ',KAP/FLOAT(MOL)*100,' %'
      IF(KAP/FLOAT(MOL)*100..GE.PERC)GO TO 444
      GOTO 35
 444  CONTINUE
CCC   write(*,*)l,kap,mol
      RETURN
 325  WRITE(*,764)
      RETURN
      END