PyResis/propulsion_power.py
def reynolds_number(length, speed, temperature=25):
    """
    Reynold number utility function that return Reynold number for vehicle at specific length and speed.
    Optionally, it can also take account of temperature effect of sea water.

        Kinematic viscosity from: http://web.mit.edu/seawater/2017_MIT_Seawater_Property_Tables_r2.pdf

    :param length: metres length of the vehicle
    :param speed: m/s speed of the vehicle
    :param temperature: degree C 
    :return: Reynolds number of the vehicle (dimensionless)
    """
    kinematic_viscosity = interpolate.interp1d([0, 10, 20, 25, 30, 40],
                                               np.array([18.54, 13.60, 10.50, 9.37, 8.42, 6.95]) / 10 ** 7)
    # Data from http://web.mit.edu/seawater/2017_MIT_Seawater_Property_Tables_r2.pdf
    Re = length * speed / kinematic_viscosity(temperature)
    return Re
def reynolds_number(length, speed, temperature=25):
    """
    Reynold number utility function that return Reynold number for vehicle at specific length and speed.
    Optionally, it can also take account of temperature effect of sea water.

        Kinematic viscosity from: http://web.mit.edu/seawater/2017_MIT_Seawater_Property_Tables_r2.pdf

    :param length: metres length of the vehicle
    :param speed: m/s speed of the vehicle
    :param temperature: degree C 
    :return: Reynolds number of the vehicle (dimensionless)
    """
    kinematic_viscosity = interpolate.interp1d([0, 10, 20, 25, 30, 40],
                                               np.array([18.54, 13.60, 10.50, 9.37, 8.42, 6.95]) / 10 ** 7)
    # Data from http://web.mit.edu/seawater/2017_MIT_Seawater_Property_Tables_r2.pdf
    Re = length * speed / kinematic_viscosity(temperature)
    return Re
Reynold number utility function that return Reynold number for vehicle at specific length and speed.
    Optionally, it can also take account of temperature effect of sea water.

        Kinematic viscosity from: http://web.mit.edu/seawater/2017_MIT_Seawater_Property_Tables_r2.pdf

    :param length: metres length of the vehicle
    :param speed: m/s speed of the vehicle
    :param temperature: degree C 
    :return: Reynolds number of the vehicle (dimensionless)