Fig. 3

Establishment of the hemodynamic physical model. A–C The obtainment of the morphological data. The entry angle > 90° in A ≈ 90° in B and > 90° in c, respectively. D The grid after meshing and vessel boundary: SSS superior sagittal sinus; BV bridging vein; Black circle dural entrance which is the point that BV entering SSS; α entry angle which is the angle that BV entering the SSS; I-SSS inlet of SSS; BV inlet of BV; O-SSS outlet of SSS; SSU upstream wall of SSS from the dural entrance; SSD downstream wall of SSS from the dural entrance; SSO opposite wall of SSS from the dural entrance; BVU upstream wall of BV from the dural entrance; BVD downstream wall of BV from the dural entrance