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accelerate_kernel.f90
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!Crown Copyright 2012 AWE.
!
! This file is part of CloverLeaf.
!
! CloverLeaf is free software: you can redistribute it and/or modify it under
! the terms of the GNU General Public License as published by the
! Free Software Foundation, either version 3 of the License, or (at your option)
! any later version.
!
! CloverLeaf 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
! CloverLeaf. If not, see http://www.gnu.org/licenses/.
!> @brief Fortran acceleration kernel
!> @author Wayne Gaudin
!> @details The pressure and viscosity gradients are used to update the
!> velocity field.
MODULE accelerate_kernel_module
CONTAINS
SUBROUTINE accelerate_kernel(x_min,x_max,y_min,y_max,z_min,z_max,dt, &
xarea,yarea,zarea, &
volume, &
density0, &
pressure, &
viscosity, &
xvel0, &
yvel0, &
zvel0, &
xvel1, &
yvel1, &
zvel1, &
stepbymass )
IMPLICIT NONE
INTEGER :: x_min,x_max,y_min,y_max,z_min,z_max
REAL(KIND=8) :: dt
REAL(KIND=8), DIMENSION(x_min-2:x_max+2 ,y_min-2:y_max+2 ,z_min-2:z_max+2) :: density0
REAL(KIND=8), DIMENSION(x_min-2:x_max+2 ,y_min-2:y_max+2 ,z_min-2:z_max+2) :: volume
REAL(KIND=8), DIMENSION(x_min-2:x_max+3 ,y_min-2:y_max+2 ,z_min-2:z_max+2) :: xarea
REAL(KIND=8), DIMENSION(x_min-2:x_max+2 ,y_min-2:y_max+3 ,z_min-2:z_max+2) :: yarea
REAL(KIND=8), DIMENSION(x_min-2:x_max+2 ,y_min-2:y_max+2 ,z_min-2:z_max+3) :: zarea
REAL(KIND=8), DIMENSION(x_min-2:x_max+2 ,y_min-2:y_max+2 ,z_min-2:z_max+2) :: pressure
REAL(KIND=8), DIMENSION(x_min-2:x_max+2 ,y_min-2:y_max+2 ,z_min-2:z_max+2) :: viscosity
REAL(KIND=8), DIMENSION(x_min-2:x_max+3 ,y_min-2:y_max+3 ,z_min-2:z_max+3) :: xvel0,yvel0,zvel0
REAL(KIND=8), DIMENSION(x_min-2:x_max+3 ,y_min-2:y_max+3 ,z_min-2:z_max+3) :: xvel1,yvel1,zvel1
REAL(KIND=8), DIMENSION(x_min-2:x_max+3 ,y_min-2:y_max+3 ,z_min-2:z_max+3) :: stepbymass
INTEGER :: j,k,l
REAL(KIND=8) :: nodal_mass
!$ACC DATA &
!$ACC PCOPY(density0,volume,pressure,viscosity,xarea,yarea,xvel0,yvel0)&
!$ACC PCOPY(xvel1,yvel1,zvel1,zvel0,zarea) &
!$ACC PCOPY(stepbymass)
!$ACC KERNELS
!$ACC LOOP INDEPENDENT
DO l=z_min,z_max+1
!$ACC LOOP INDEPENDENT
DO k=y_min,y_max+1
!$ACC LOOP INDEPENDENT PRIVATE(nodal_mass)
DO j=x_min,x_max+1
nodal_mass=(density0(j-1,k-1,l )*volume(j-1,k-1,l ) &
+density0(j ,k-1,l )*volume(j ,k-1,l ) &
+density0(j ,k ,l )*volume(j ,k ,l ) &
+density0(j-1,k ,l )*volume(j-1,k ,l ) &
+density0(j-1,k-1,l-1)*volume(j-1,k-1,l-1) &
+density0(j ,k-1,l-1)*volume(j ,k-1,l-1) &
+density0(j ,k ,l-1)*volume(j ,k ,l-1) &
+density0(j-1,k ,l-1)*volume(j-1,k ,l-1)) &
*0.125_8
stepbymass(j,k,l)=0.25_8*dt/nodal_mass
ENDDO
ENDDO
ENDDO
!$ACC LOOP INDEPENDENT
DO l=z_min,z_max+1
!$ACC LOOP INDEPENDENT
DO k=y_min,y_max+1
!$ACC LOOP INDEPENDENT
DO j=x_min,x_max+1
xvel1(j,k,l)=xvel0(j,k,l)-stepbymass(j,k,l)*(xarea(j ,k ,l )*(pressure(j ,k ,l )-pressure(j-1,k ,l )) &
+xarea(j ,k-1,l )*(pressure(j ,k-1,l )-pressure(j-1,k-1,l )) &
+xarea(j ,k ,l-1)*(pressure(j ,k ,l-1)-pressure(j-1,k ,l-1)) &
+xarea(j ,k-1,l-1)*(pressure(j ,k-1,l-1)-pressure(j-1,k-1,l-1)))
ENDDO
ENDDO
ENDDO
!$ACC LOOP INDEPENDENT
DO l=z_min,z_max+1
!$ACC LOOP INDEPENDENT
DO k=y_min,y_max+1
!$ACC LOOP INDEPENDENT
DO j=x_min,x_max+1
yvel1(j,k,l)=yvel0(j,k,l)-stepbymass(j,k,l)*(yarea(j ,k ,l )*(pressure(j ,k ,l )-pressure(j ,k-1,l )) &
+yarea(j-1,k ,l )*(pressure(j-1,k ,l )-pressure(j-1,k-1,l )) &
+yarea(j ,k ,l-1)*(pressure(j ,k ,l-1)-pressure(j ,k-1,l-1)) &
+yarea(j-1,k ,l-1)*(pressure(j-1,k ,l-1)-pressure(j-1,k-1,l-1)))
ENDDO
ENDDO
ENDDO
!$ACC LOOP INDEPENDENT
DO l=z_min,z_max+1
!$ACC LOOP INDEPENDENT
DO k=y_min,y_max+1
!$ACC LOOP INDEPENDENT
DO j=x_min,x_max+1
zvel1(j,k,l)=zvel0(j,k,l)-stepbymass(j,k,l)*(zarea(j ,k ,l )*(pressure(j ,k ,l )-pressure(j ,k ,l-1)) &
+zarea(j ,k-1,l )*(pressure(j ,k-1,l )-pressure(j ,k-1,l-1)) &
+zarea(j-1,k ,l )*(pressure(j-1,k ,l )-pressure(j-1,k ,l-1)) &
+zarea(j-1,k-1,l )*(pressure(j-1,k-1,l )-pressure(j-1,k-1,l-1)))
ENDDO
ENDDO
ENDDO
!$ACC LOOP INDEPENDENT
DO l=z_min,z_max+1
!$ACC LOOP INDEPENDENT
DO k=y_min,y_max+1
!$ACC LOOP INDEPENDENT
DO j=x_min,x_max+1
xvel1(j,k,l)=xvel1(j,k,l)-stepbymass(j,k,l)*(xarea(j ,k ,l )*(viscosity(j ,k ,l )-viscosity(j-1,k ,l )) &
+xarea(j ,k-1,l )*(viscosity(j ,k-1,l )-viscosity(j-1,k-1,l )) &
+xarea(j ,k ,l-1)*(viscosity(j ,k ,l-1)-viscosity(j-1,k ,l-1)) &
+xarea(j ,k-1,l-1)*(viscosity(j ,k-1,l-1)-viscosity(j-1,k-1,l-1)))
ENDDO
ENDDO
ENDDO
!$ACC LOOP INDEPENDENT
DO l=z_min,z_max+1
!$ACC LOOP INDEPENDENT
DO k=y_min,y_max+1
!$ACC LOOP INDEPENDENT
DO j=x_min,x_max+1
yvel1(j,k,l)=yvel1(j,k,l)-stepbymass(j,k,l)*(yarea(j ,k ,l )*(viscosity(j ,k ,l )-viscosity(j ,k-1,l )) &
+yarea(j-1,k ,l )*(viscosity(j-1,k ,l )-viscosity(j-1,k-1,l )) &
+yarea(j ,k ,l-1)*(viscosity(j ,k ,l-1)-viscosity(j ,k-1,l-1)) &
+yarea(j-1,k ,l-1)*(viscosity(j-1,k ,l-1)-viscosity(j-1,k-1,l-1)))
ENDDO
ENDDO
ENDDO
!$ACC LOOP INDEPENDENT
DO l=z_min,z_max+1
!$ACC LOOP INDEPENDENT
DO k=y_min,y_max+1
!$ACC LOOP INDEPENDENT
DO j=x_min,x_max+1
zvel1(j,k,l)=zvel1(j,k,l)-stepbymass(j,k,l)*(zarea(j ,k ,l )*(viscosity(j ,k ,l )-viscosity(j ,k ,l-1)) &
+zarea(j ,k-1,l )*(viscosity(j ,k-1,l )-viscosity(j ,k-1,l-1)) &
+zarea(j-1,k ,l )*(viscosity(j-1,k ,l )-viscosity(j-1,k ,l-1)) &
+zarea(j-1,k-1,l )*(viscosity(j-1,k-1,l )-viscosity(j-1,k-1,l-1)))
ENDDO
ENDDO
ENDDO
!$ACC END KERNELS
!$ACC WAIT
!$ACC END DATA
END SUBROUTINE accelerate_kernel
END MODULE accelerate_kernel_module