BodyForce.h
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BodyForce.h
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			#ifndef BODY_FORCE_H
			#define BODY_FORCE_H

			#include <map>
			#include <string>
			#include "ATC_TypeDefs.h"
			#include "Function.h"

			namespace ATC {

			/**
			* @class BodyForce
			* @brief Base class for models of body forces in the momentum eqn
			*/

			class BodyForce
			{
			public:
			BodyForce() {};
			virtual ~BodyForce() {};
			virtual bool body_force(const FIELD_MATS &fields,
			DENS_MAT &flux) const { return false; };
			};

			/**
			* @class BodyForceViscous
			* @brief viscous body forces
			*/
			class BodyForceViscous : public BodyForce
			{
			public:
			BodyForceViscous(std::fstream &matfile,std::map<std::string,double> & parameters);
			virtual ~BodyForceViscous() {};
			virtual bool body_force(const FIELD_MATS &fields,
			DENS_MAT &flux) const
			{
			FIELD_MATS::const_iterator v_field = fields.find(VELOCITY);
			const DENS_MAT & v = v_field->second;
			flux = -gamma_*v;
			return true;
			}
			protected:
			double gamma_;
			};
			/**
			* @class BodyForceElectricField
			* @brief electric field body forces
			*/
			class BodyForceElectricField : public BodyForce
			{
			public:
			BodyForceElectricField(std::fstream &matfile,std::map<std::string,double> & parameters)
			{ throw ATC_Error("unimplemented due to issues with accessing electric field"); }
			virtual ~BodyForceElectricField() {};
			virtual bool body_force(const FIELD_MATS &fields,
			DENS_MAT &flux) const
			{
			FIELD_MATS::const_iterator v_field = fields.find(VELOCITY);
			const DENS_MAT & v = v_field->second;
			int nNodes = v.nRows();
			flux.reset(nNodes,1);
			return true;
			}
			};
			}
			#endif