140 lines
3.3 KiB
C++
140 lines
3.3 KiB
C++
// gas.h
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//
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// Author: J.A. de Jong
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//
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// Description:
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// Gas properties interface
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//////////////////////////////////////////////////////////////////////
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#pragma once
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#ifndef GAS_H
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#define GAS_H
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#include <string>
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#include <armadillo>
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#include "tasmet_enum.h"
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#include "tasmet_types.h"
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#include "tasmet_constants.h"
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#include "protobuf/gas.pb.h"
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using pb::GasType;
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using pb::air;
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using pb::helium;
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using pb::nitrogen;
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#define element_wise(varname) \
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vd varname_(T.size()); \
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for(us i=0;i<T.size();i++) \
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varname_ = varname(T(i),p(i));\
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return varname_
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class Gas{
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public:
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private:
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GasType _gastype;
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protected:
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d _T0,_p0; /* Reference temperature and pressure */
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Gas(GasType gastype,d T0,d p0):_gastype(gastype),_T0(T0),_p0(p0){}
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public:
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Gas(const Gas& other) =delete;
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Gas& operator=(const Gas&)=delete;
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virtual ~Gas(){}
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// Static method to generate a Gas
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virtual Gas* copy() const = 0;
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static Gas* newGas(const GasType gastype,d T0, d p0);
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operator GasType() { return _gastype;}
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d T0() const {return _T0;}
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d p0() const {return _p0;}
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// Speed of sound at the reference temperature and pressure
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d c0() const {return cm(_T0,_p0);}
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d rho0() const {return rho(_T0,_p0);}
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d deltanu0(d freq) const{ return sqrt(2*mu(_T0,_p0)/(rho0()*2*number_pi*freq));}
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d deltanu(d freq,d T,d p) const { return sqrt(2*mu(T,p)/(rho(T,p)*2*number_pi*freq)); }
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// Dimensionless numbers:
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// Specific heat ratio
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d gamma(d T,d p) const {return cp(T,p)/cv(T,p);}
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vd gamma(const vd& T,const vd& p) const {
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element_wise(gamma);
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}
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// Prandtl number
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vd pr(const vd& T,const vd& p) const {return mu(T,p)%cp(T,p)/kappa(T,p);}
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d pr(d T,d p) const {return mu(T,p)*cp(T,p)/kappa(T,p);}
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// Virtuals that are part of the interface
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// Density [kg/m^3]
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virtual d rho(d T,d p) const=0;
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vd rho(const vd& T,const vd& p) const {
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element_wise(rho);
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}
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virtual d drhodT(d T,d p) const=0;
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vd drhodT(const vd& T,const vd& p) const {
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element_wise(drhodT);
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}
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virtual d drhodp(d T,d p) const=0;
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vd drhodp(const vd& T,const vd& p) const {
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element_wise(drhodp);
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}
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// Adiabatic speed of sound
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virtual d cm(d T,d p) const=0;
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vd cm(const vd& T,const vd& p) const {
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element_wise(cm);
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}
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// Internal energy [J/kg]
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virtual d e(d T,d p) const=0;
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vd e(const vd& T,const vd& p) const {
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element_wise(e);
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}
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// Static enthalpy [J/kg]
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virtual d h(d T,d p) const=0;
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vd h(const vd& T,const vd& p) const {
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element_wise(h);
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}
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// Specific heat at constant pressure
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virtual d cp(d T,d p) const=0;
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vd cp(const vd& T,const vd& p) const {
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element_wise(cp);
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}
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// Specific heat at constant density
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virtual d cv(d T,d p) const=0;
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vd cv(const vd& T,const vd& p) const {
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element_wise(cv);
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}
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// Dynamic viscosity [Pa*s]
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virtual d mu(d T,d p) const=0;
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vd mu(const vd& T,const vd& p) const {
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element_wise(mu);
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}
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// Thermal conductivity [W/mK]
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virtual d kappa(d T,d p) const=0;
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vd kappa(const vd& T,const vd& p) const {
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element_wise(kappa);
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}
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};
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#undef element_wise
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#endif // GAS_H
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//////////////////////////////////////////////////////////////////////
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