So in that case, instead of 2 way FSI analysis in time domain, you can try and use harmonic acoustic analysis in frequency domain – the arteries are the structural regions, and the fluid inside them is the acoustic region, and you apply a Pressure load on the walls which is Pressure (Pa) vs. frequency instead (use radiation boundary to avoid any reflections from the end of the model in the acoustic regions). See the internet for tutorials and search this forum:
See this video – in this case you do not need cfd since you know the external wall pressures which you can just apply onto the wall using the Pressure load (tabular vs freq.), so no need to use the Imported CFD press. as in the video.
Hope this helps