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subroutine AdditionalInit_LinearEuler2D_PML_t(this)implicit none class(LinearEuler2D_PML_t),intent(inout)::this! Localprocedure(SELF_bcMethod),pointer::bcfunc! Allocate the per-node PML damping fields (single variable each).call this%sigma_x%Init(this%geometry%x%interp,1,this%mesh%nElem)call this%sigma_y%Init(this%geometry%x%interp,1,this%mesh%nElem)! Register PML-aware BC methods. The PML-aware versions reuse the! parent acoustic-side behaviour for variables 1-5 and zero the! auxiliary variables 6-9 in extBoundary so that interior-side! and exterior-side states are consistent with the zero-flux! treatment of phi_*.bcfunc=>hbc2d_NoNormalFlow_LinearEuler2D_PMLcall this%hyperbolicBCs%RegisterBoundaryCondition(&SELF_BC_NONORMALFLOW,"no_normal_flow",bcfunc)bcfunc=>hbc2d_Radiation_LinearEuler2D_PMLcall this%hyperbolicBCs%RegisterBoundaryCondition(&SELF_BC_RADIATION,"radiation",bcfunc)endsubroutine AdditionalInit_LinearEuler2D_PML_t