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多孔介质期刊
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多孔介质期刊

DOI: 10.1615/JPorMedia.2019028847
pages 1439-1448

NUMERICAL HEMODYNAMICS ANALYSIS FOR CEREBRAL ANEURYSM WITH POROUS INSERTS

Mohammad O. Hamdan
Department of Mechanical Engineering, College of Engineering, American University of Sharjah, PO Box 26666, Sharjah, UAE
Hashem M. Alargha
United Arab Emirates University, Mechanical Engineering Department, AlAin, UAE
Emad Elnajjar
United Arab Emirates University, Mechanical Engineering Department, AlAin, UAE
Ali Hilal-Alnaqbi
United Arab Emirates University, Mechanical Engineering Department, AlAin, UAE
Amr Elshawarby
Tawam Hospital, Neuro Endovascular Centre, AlAin, UAE
Waseem H. Aziz
Tawam Hospital, Neuro Endovascular Centre, AlAin, UAE; Department of Neurosurgery, Alexandria University School of Medicine, Egypt

ABSTRACT

This numerical study uses the ANSYS Fluent Computational Fluid Dynamics (CFD) tool to assess coil parameters that affect the hemodynamics characteristics after aneurysm endovascular coiling. The study focuses on investigating the effect of coils' compactness and coils' diameter on the hemodynamics of the blood and mainly on the wall shear stresses (WSS). Using Darcy's law, a porous media model for fibrous mesh is used to represent the embolic coils space inside an idealized terminal-type cerebral aneurysm model. The results show that as the coil radius increases, the WSS decreases. Also, the results show that as coiled space porosity increases from 0.1 up to 0.9, the inflow rate crossing to the aneurysm increases. Regions with highest compactness are showing the lowest WSS. Our conclusion is that it is better to use larger coil diameters while assuring porosity is kept at low values (lower than 0.2).


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