def METHOD_NAME(density, viscosity, f_other=0.0):
    A = _A_coeff(density)
    B = _B_coeff(density, viscosity)
    f_res = 0.033 * A + 0.00087 * B - 0.74
    f_res = np.clip(f_res, 0.0, 1.0 - f_other)
    return f_res