def METHOD_NAME(self, assembler):
    """
    Setup tacs integrator responsible for solving transient problem we will be testing.
    """
    # Create the BDF integrator solver
    order = 2
    # Set the file output format
    integrator = TACS.BDFIntegrator(
        assembler, tinit, tfinal, float(num_steps), order
    )
    return integrator