Inlet flow oscillation(Need Help)

[Throneyjy]

My goal is to simulate specific coronary artery segments (LMA and LAD and LCX proximal segments). I used the time-varying pressure waveform in the Left_coronary_inlet_pressure_wave_outlet_coronary.in file in the system test as the inlet boundary condition, and used the RCR in the literature as the outlet boundary condition (it has been ensured that the LAD and LCX outlets conform to the physiological flow waveform).
But I found that the flow at the inlet has obvious oscillations. Is this related to the numerical format setting of this one-dimensional solver? How can I solve this problem? (The attached picture shows my one-dimensional file settings and simulation results)
(plus I designed its 3d model but when I run the same boundry conditions as the 1d file, it did't convergence)