Units.hpp

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#pragma once
 
#include <polyfem/Common.hpp>
 
#include <spdlog/fmt/ostr.h>
 
#include <string>
 
namespace polyfem
{
    class Units
    {
    public:
        void init(const json &json);
 
        static double convert(const json &val, const std::string &unit_type);
        static double convert(const double val, const std::string &unit, const std::string &unit_type);
 
        const std::string &length() const { return length_; }
        const std::string &mass() const { return mass_; }
        const std::string &time() const { return time_; }
        double characteristic_length() const { return characteristic_length_; }
        double &characteristic_length() { return characteristic_length_; }
 
        std::string stress() const { return fmt::format("{}/({}*{}^2)", mass_, length_, time_); }
        std::string density() const { return fmt::format("{}/{}^3", mass_, length_); }
        std::string velocity() const { return fmt::format("{}/{}", length_, time_); }
        std::string acceleration() const { return fmt::format("{}/{}^2", length_, time_); }
        std::string force() const { return fmt::format("{}*{}", mass_, acceleration()); }
        std::string pressure() const { return fmt::format("{}*{}/{}", mass_, acceleration(), length_); }
        std::string energy() const { return fmt::format("{}*{}^2/{}^2", mass_, length_, time_); }
        std::string viscosity() const { return fmt::format("{}/{}^2*{}", force(), length_, time_); }
 
    private:
        std::string length_ = "m";
        std::string mass_ = "kg";
        std::string time_ = "s";
        double characteristic_length_ = 1;
    };
} // namespace polyfem