idefix/src/units.cpp at master · idefix-code/idefix · GitHub

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// ***********************************************************************************

// Idefix MHD astrophysical code

// Source file src/units.cpp

// Last modified : 04/2025

// Copyright(C) by :

// - Geoffroy Lesur <geoffroy.lesur@univ-grenoble-alpes.fr> (IPAG/UGA/CNRS - 2025)

// and other code contributors

// Licensed under CeCILL 2.1 License, see COPYING for more information

// ***********************************************************************************

#include "units.hpp"

#include "idefix.hpp"

#include "input.hpp"

void idfx::Units::Init(Input &input) {

if(input.CheckBlock("Units")) {

this->_length = input.GetOrSet<real>("Units","length",0,1.0);

this->_velocity = input.GetOrSet<real>("Units","velocity",0,1.0);

this->_density = input.GetOrSet<real>("Units","density",0,1.0);

this->ComputeUnits();

}

void idfx::Units::SetDensity(const real in) {

this->_density = in;

this->ComputeUnits();

}

void idfx::Units::SetLength(const real in) {

this->_length = in;

this->ComputeUnits();

}

void idfx::Units::SetVelocity(const real in) {

this->_velocity = in;

this->ComputeUnits();

}

void idfx::Units::ShowConfig() {

if(_isInitialized) {

idfx::cout << "Units: [Length] = " << this->_length << " cm" << std::endl;

idfx::cout << "Units: [Velocity] = " << this->_velocity << " cm/s" << std::endl;

idfx::cout << "Units: [Density] = " << this->_density << " g/cm3" << std::endl;

idfx::cout << "Units: [Energy] = " << this->_energy << " erg/cm3" << std::endl;

idfx::cout << "Units: [Time] = " << this->_time << " s" << std::endl;

idfx::cout << "Units: [Temperature] = " << this->_Kelvin << " K" << std::endl;

idfx::cout << "Units: [Mag. Field] = " << this->_magField << " G" << std::endl;

}

void idfx::Units::ComputeUnits() {

this->_isInitialized = true;

this->_magField = std::sqrt(4*M_PI*_density*_velocity*_velocity);

this->_Kelvin = u * _velocity*_velocity/k_B;

this->_energy = _density*_velocity*_velocity;

this->_time = _length/_velocity;

}

idefix/src/units.cpp at master · idefix-code/idefix · GitHub

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