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rk.f90
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rk.f90
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MODULE rkmod
USE prms
USE data
USE stokes
IMPLICIT none
real :: fac_3,fac_6,fac_2
CONTAINS
SUBROUTINE initRK
fac_3 = 1./3.*dt
fac_2 = .5*dt
fac_6 = 1./6.*dt
END SUBROUTINE initRK
SUBROUTINE rk2(time,lt)
real,dimension(2,Np) :: dXac,dXcf,dXmc,Xc,UU
real :: time_local
real :: time
integer :: lt
character(50) :: fn
! temporary
integer :: i
time_local = time
! print*, "call rhs"
call rhs(X,dXac,time_local,lt)
! print*, "call meanu"
call meanU(X,dXmc,time_local)
Xc = X + 0.5*dt*(dXac+dXmc)
!open(1,file='CellVel.xdir.rk',form='FORMATTED')
!Do i = 1, Np
!write(1,*) dXac(1,i)+dXmc(1,i)
!End Do
close(1)
time_local = time + dt/2.
call rhs(Xc,dXac,time_local,lt)
call meanU(Xc,dXmc,time_local)
X = X + dt*(dXac+dXmc)
time = time + dt
!time_local = time
!call rhs(X,dXac,time_local,lt)
!Xc = X + 0.5*dt*dXac
!!call meanU(X,dXmc)
!!Xc = X + 0.5*dt*(dXac+dXmc)
!time_local = time + dt/2.
!call rhs(Xc,dXac,time_local,lt)
!X = X + dt*dXac
!!call meanU(Xc,dXmc)
!!X = X + dt*(dXac+dXmc)
!time = time + dt
!open(1,file='CellVel.xdir.rk',form='FORMATTED')
!Do i = 1, Np
!write(1,*) UU(1,i)
!End Do
!close(1)
END SUBROUTINE rk2
END MODULE rkmod