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import numpy as np

def get_y_hh(y, l, Re_l):
    """
    Function to convert y values to y'' values.

    Parameters:
    y (float): The y value to be converted.
    l (float): Length of the boundary layer.
    Re_l (float): Reynolds number with reference to l.

    Returns:
    float: The converted y'' value.
    """
    y_hh = y / l * np.sqrt(Re_l)
    return y_hh