forked from lijiext/lammps
65 lines
2.1 KiB
C++
65 lines
2.1 KiB
C++
#ifndef VISCOUS_STRESS_H
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#define VISCOUS_STRESS_H
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#include <map>
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#include <string>
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#include <vector>
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#include <fstream>
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#include "MatrixLibrary.h"
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#include "ATC_TypeDefs.h"
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namespace ATC {
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/**
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* @class ViscousStress
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* @brief Base class that defines interface for a constitutive law
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* @brief that computes viscous stresses given all field and gradient information.
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*/
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class ViscousStress
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{
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public:
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ViscousStress() {};
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virtual ~ViscousStress() {};
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virtual void initialize(void){};
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//* Returns parameter values, (Nothing uses this).
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virtual void parameters(std::map<std::string,double> ¶meters) {}
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//* Computes viscous stress given a strain rate tensor.
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//* Units: mvv/L^3 (i.e. for units Real: g/(mol ps^2 A^2) )
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virtual void viscous_stress(const FIELD_MATS &fields,
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const GRAD_FIELD_MATS &gradFields,
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DENS_MAT_VEC &stress)=0;
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virtual void viscosity(const FIELD_MATS & fields,
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DENS_MAT & coefs) const
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{throw ATC_Error("ViscousStress::viscosity: unimplemented function");}
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//* Returns the derivative of the stress tensor for a given strain-rate tensor.
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virtual void tangent(const MATRIX &F, MATRIX &C) const
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{throw ATC_Error("ViscousStress::tangent: unimplemented function");}
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};
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/**
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* @class ViscousStressConstant
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* @brief Class for computing stress for a constant viscosity material
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* assuming divergence-free flow
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*/
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class ViscousStressConstant : public ViscousStress
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{
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public:
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ViscousStressConstant():viscosity_(0.){};
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ViscousStressConstant(std::fstream &matfile);
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ViscousStressConstant(double viscosity)
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: viscosity_(viscosity) {};
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void viscous_stress(const FIELD_MATS &fields,
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const GRAD_FIELD_MATS &gradFields,
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DENS_MAT_VEC &flux);
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void viscosity(const FIELD_MATS & fields,
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DENS_MAT & coefs) const;
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protected:
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double viscosity_;
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void set_tangent();
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};
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}
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#endif
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