GaussBC Class Reference

Class to enforce proper boundary conditions for the spherical collapse of a cloud. More...

#include <GaussBC.H>

Inheritance diagram for GaussBC:

[legend]Collaboration diagram for GaussBC:

[legend]List of all members.

Public Member Functions
	GaussBC ()
	Null constructor.
	GaussBC (int dir, Side::LoHiSide sd)
	Basic constructor -- sets Interval to (0,0).
	GaussBC (int dir, Side::LoHiSide sd, const Interval &a_comps)
	Full constructor.
	~GaussBC ()
	Destructor.
virtual void	setParameters (const Real &a_mass, const Real &a_lScale=1, const RealVect &a_center=RealVect(D_DECL(0.5, 0.5, 0.5)))
Protected Member Functions
virtual void	fillBCValues (FArrayBox &a_neumfac, FArrayBox &a_dircfac, FArrayBox &a_inhmval, Real a_dx, const Box &a_domain) const
virtual void	fillBCValues (FArrayBox &a_neumfac, FArrayBox &a_dircfac, FArrayBox &a_inhmval, Real a_dx, const ProblemDomain &a_domain) const
BoxGhostBC *	new_boxghostbc () const
Protected Attributes
Real	m_mass
	mass that determines the potential at the boundary cells
Real	m_scale
	scale to convert dx -> dl= scale*dx
RealVect	m_center
	location of the center of mass of m_mass
Friends
class	DomainGhostBC

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Detailed Description

Class to enforce proper boundary conditions for the spherical collapse of a cloud.

We require that the potential on the boundary of the box is set by the mass enclosed by the radius at which the cell find itself. We use this class for two problems: 1) the collapse of a pressureless cloud in which case the mass referred to above is the total mass in the box. 2) the cosmological, secondary infall problem in which case the mass is due to the overdensity with respect to the average.

Recall that BoxGhostBC is a class to encapsulate the operations of ghost-cell boundary conditions at a face. If the solution is phi and the face normal direction is x, the boundary conditions usually used can be expressed as A*phi + B*dphi/dx = C. Our conditions require, A=1, B=0, C=f(r) These functions are only meant to be called by DomainGhostBC

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Constructor & Destructor Documentation

GaussBC::GaussBC (   )

Null constructor.

GaussBC::GaussBC (  int  dir, Side::LoHiSide  sd )

Basic constructor -- sets Interval to (0,0).

GaussBC::GaussBC (  int  dir, Side::LoHiSide  sd, const Interval &  a_comps )

Full constructor.

GaussBC::~GaussBC (   )

Destructor.

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Member Function Documentation

virtual void GaussBC::fillBCValues (  FArrayBox &  a_neumfac, FArrayBox &  a_dircfac, FArrayBox &  a_inhmval, Real  a_dx, const ProblemDomain &  a_domain )  const [protected, virtual]

Fills coefficient arrays -- fills neumann factor with 1.0 and other two fields with 0.0. Implements BoxGhostBC.

virtual void GaussBC::fillBCValues (  FArrayBox &  a_neumfac, FArrayBox &  a_dircfac, FArrayBox &  a_inhmval, Real  a_dx, const Box &  a_domain )  const [protected, virtual]

Fills coefficient arrays -- fills neumann factor with 1.0 and other two fields with 0.0. Implements BoxGhostBC.

BoxGhostBC* GaussBC::new_boxghostbc (   )  const [protected, virtual]

Virtual constructor workaround. Implements BoxGhostBC.

virtual void GaussBC::setParameters (  const Real &  a_mass, const Real &  a_lScale = 1, const RealVect &  a_center = RealVect(D_DECL(0.5, 0.5, 0.5)) )  [virtual]

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Friends And Related Function Documentation

friend class DomainGhostBC [friend]

Reimplemented from BoxGhostBC.

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Member Data Documentation

RealVect GaussBC::m_center [protected]

location of the center of mass of m_mass

Real GaussBC::m_mass [protected]

mass that determines the potential at the boundary cells

Real GaussBC::m_scale [protected]

scale to convert dx -> dl= scale*dx

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

• GaussBC.H

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