Figure 2: Helicity and streamline for the six cases.
From: Improvement of hemodynamic performance using novel helical flow vena cava filter design

I: Eight cross-sections in the vena cava model, with each adjacent side distance measuring 9 mm; plots of area-weighted averages of Hd at eight representative cross-sections of six cases from steady flow computations; net helicity was also given. II: Peak systole (Time = t2) velocity streamline for the six cases from pulsatile flow computations.