UpdateSolution_DGModel2D_t Subroutine

  subroutine UpdateSolution_DGModel2D_t(this,dt)
    !! Computes a solution update as , where dt is either provided through the interface
    !! or taken as the Model's stored time step size (model % dt)
    implicit none
    class(DGModel2D_t),intent(inout) :: this
    real(prec),optional,intent(in) :: dt
    ! Local
    real(prec) :: dtLoc
    integer :: i,j,iEl,iVar

    if(present(dt)) then
      dtLoc = dt
    else
      dtLoc = this%dt
    endif

    do concurrent(i=1:this%solution%N+1,j=1:this%solution%N+1, &
                  iel=1:this%mesh%nElem,ivar=1:this%solution%nVar)

      this%solution%interior(i,j,iEl,iVar) = &
        this%solution%interior(i,j,iEl,iVar)+ &
        dtLoc*this%dSdt%interior(i,j,iEl,iVar)

    enddo

  endsubroutine UpdateSolution_DGModel2D_t