compressible_ops_cpu.f90

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module compressible_ops_cpu
  use num_types, only : rp
  implicit none
  private
 
  public :: compressible_ops_cpu_compute_max_wave_speed, &
            compressible_ops_cpu_compute_entropy
 
contains
 
  subroutine compressible_ops_cpu_compute_max_wave_speed(max_wave_speed, u, v, w, gamma, p, rho, n)
    integer, intent(in) :: n
    real(kind=rp), intent(in) :: gamma
    real(kind=rp), dimension(n), intent(in) :: u, v, w, p, rho
    real(kind=rp), dimension(n), intent(inout) :: max_wave_speed
    integer :: i
    real(kind=rp) :: vel_mag, sound_speed
 
    ! Compute maximum wave speed: |u| + c = sqrt(u^2 + v^2 + w^2) + sqrt(gamma * p / rho)
    do concurrent(i = 1:n)
       vel_mag = sqrt(u(i)*u(i) + v(i)*v(i) + w(i)*w(i))
       sound_speed = sqrt(gamma * p(i) / rho(i))
       max_wave_speed(i) = vel_mag + sound_speed
    end do
 
  end subroutine compressible_ops_cpu_compute_max_wave_speed
 
  subroutine compressible_ops_cpu_compute_entropy(S, p, rho, gamma, n)
    integer, intent(in) :: n
    real(kind=rp), intent(in) :: gamma
    real(kind=rp), dimension(n), intent(in) :: p, rho
    real(kind=rp), dimension(n), intent(inout) :: s
    integer :: i
 
    ! Compute entropy: S = 1/(gamma-1) * rho * (log(p) - gamma * log(rho))
    do concurrent(i = 1:n)
       s(i) = (1.0_rp / (gamma - 1.0_rp)) * rho(i) * &
            (log(p(i)) - gamma * log(rho(i)))
    end do
 
  end subroutine compressible_ops_cpu_compute_entropy
 
end module compressible_ops_cpu