hexed::Pressure_outflow Class Reference

sets pressure on outflow boundaries More...

#include <Boundary_condition.hpp>

Inheritance diagram for hexed::Pressure_outflow:

Public Member Functions
	Pressure_outflow (double pressure)
void	apply_state (Boundary_connection &) override
	applies boundary condition to state variables (Dirichlet BCs)
void	apply_flux (Boundary_connection &) override
bool	smooth () const override
	Returns false if this BC tends to cause the flow not to be smooth.
Public Member Functions inherited from hexed::Flow_bc
virtual void	apply_advection (Boundary_connection &)
	applies boundary condition to linear advection equation used to compute nonsmoothness indicator
virtual void	apply_diffusion (Boundary_connection &)
virtual void	flux_diffusion (Boundary_connection &)
virtual void	init_cache (Boundary_connection &)
virtual int	n_prescribed (int n_dim) const
virtual void	set_prescribed (Interpreter &, Boundary_connection &)

Detailed Description

sets pressure on outflow boundaries

• For supersonic outflow, same as Riemann_invariants
• For subsonic outflow, sets the pressure instead of the incoming characteristic.
• Not valid for inflow. In principle, this could be less destructive than Riemann invariants for some wakes or boundary layers.

  Attention

  Sets all the viscous fluxes to zero regarding of Mach number, which makes it technically ill-posed. Not sure if that matters in practice.

Member Function Documentation

apply_flux()

void hexed::Pressure_outflow::apply_flux ( Boundary_connection & con )

overridevirtual

Todo

make this formally well-posed

Implements hexed::Flow_bc.

apply_state()

void hexed::Pressure_outflow::apply_state ( Boundary_connection & )

overridevirtual

applies boundary condition to state variables (Dirichlet BCs)

writes to the first n_var()*size() entries of ghost_state() (called on the provided Boundary_face.)

Implements hexed::Flow_bc.

smooth()

bool hexed::Pressure_outflow::smooth ( ) const

inlineoverridevirtual

Returns false if this BC tends to cause the flow not to be smooth.

Farfield BCs should be expected to cause non-smoothness, especially if they are over-constrained, whereas wall boundary conditions should not. When performing AMR, cells on non-smooth boundaries will receive special treatment to avoid excessive refinement. So, when in doubt, have new boundary conditions return true so that they can be refined.

Implements hexed::Flow_bc.

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The documentation for this class was generated from the following files:

• /home/micaiah/Desktop/hexed/include/Boundary_condition.hpp
• /home/micaiah/Desktop/hexed/libhexed/Boundary_condition.cpp