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ISSN オンライン: 2642-0554

MULTI-PHASE BLOOD FLOW MODELLING IN AN INTRACRANIAL ANEURYSM CONSIDERING POSSIBLE TRANSITION TO TURBULENCE

Philipp Berg
Lab. of Fluid Dynamics & Technical Flows University of Magdeburg "Otto von Guericke" Universitaetsplatz 2, 39106 Magdeburg, Germany

Abouelmagd Abdelsamie
Lab. of Fluid Dynamics & Technical Flows University of Magdeburg "Otto von Guericke" Universitaetsplatz 2, 39106 Magdeburg, Germany

Gabor Janiga
Lab. of Fluid Dynamics & Technical Flows University of Magdeburg "Otto von Guericke" Universitaetsplatz 2, 39106 Magdeburg, Germany

Dominique Thevenin
Laboratory of Fluid Dynamics & Technical Flows University of Magdeburg "Otto von Guericke" Universitatsplatz 2, 39106 Magdeburg, Germany

要約

Intracranial aneurysms are abnormal dilatations of the cerebral arteries that are, in case of a rupture, highly lifethreatening. Numerical investigations carried out to support clinical physicians are commonly assuming laminar flow conditions. However, especially in diseased arteries transition to turbulence has been observed.
To identify a possible transition, the effect of geometry as well as of blood cells were investigated in the present work. Therefore, hemodynamic simulations were carried out under realistic flow conditions in an idealized basilar tip aneurysm. In addition, the impact of blood cells is examined using DNS with a pseudo-spectral code, adding Lagrangian spherical particles (using a point force approach) mimicking the suspension.
The statistical analyses revealed that even under normal flow conditions fluctuations are observed during the cardiac cycle. These appear at relatively high frequencies, around 100 Hz. Additionally, the particulate phase significantly influenced the flow stability.
Hence, the results indicate that transitional effects might indeed play a role to understand hemodynamics and rupture of intracranial aneurysms, and should be accordingly taken into account.