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33 lines
726 B
Fortran
33 lines
726 B
Fortran
module laplacian_mod
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use kind_mod
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use mesh_mod, only: mesh_t
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implicit none
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!$omp requires unified_shared_memory
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private
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public :: laplacian
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contains
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subroutine laplacian(mesh,u,au)
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type(mesh_t), intent(inout) :: mesh
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real(RK), intent(inout) :: u(:,:)
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real(RK), intent(inout) :: au(:,:)
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integer(IK) :: i,j
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real(RK) :: invdx2,invdy2
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invdx2 = mesh%dx**-2
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invdy2 = mesh%dy**-2
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!$omp target teams distribute parallel do collapse(2)
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do j = 2,mesh%n_y-1
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do i = 2,mesh%n_x-1
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au(i,j) = (-u(i-1,j)+2._RK*u(i,j)-u(i+1,j))*invdx2 &
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+ (-u(i,j-1)+2._RK*u(i,j)-u(i,j+1))*invdy2
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end do
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end do
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end subroutine laplacian
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end module laplacian_mod
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