PneumaticValve.h

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#pragma once
 
#include <cmath>
#include <functional>
#include <stdexcept>
#include <vector>
 
class PneumaticValve {
  public:
    PneumaticValve(double inletPressure, double outletPressure)
        : inletPressure(inletPressure), outletPressure(outletPressure),
          flowRate(0.6875 * std::sqrt(inletPressure - outletPressure) * std::sqrt(inletPressure + outletPressure)),
          flowRateKnown(false) {}
 
    PneumaticValve(double inletPressure, double outletPressure, double flowRate)
        : inletPressure(inletPressure), outletPressure(outletPressure), flowRate(flowRate), flowRateKnown(true) {}
 
    double calculate() {
        if (!flowRateKnown) {
            return flowRate;
        }
        return flowRate /
               (0.6875 * std::sqrt(inletPressure - outletPressure) * std::sqrt(inletPressure + outletPressure));
    }
 
  private:
    double inletPressure, outletPressure, flowRate;
    bool   flowRateKnown;
};