Flow Structure and Generation of Aneurysm around Anterior Communicating Artery : 2nd Report, Velocity Profile and Distribution of Wall Shear Stress

Abstract

In the present paper, the velocity profile around the anterior communicating artery and the wall shear stress at the apex are described. The anterior communicating artery composing the circle of Willis is one of the predilection sites where cerebral aneurysm occurs frequently. The flow field around the anterior communicating artery is simulated by two confluent tubes joining at the angle of 60 degrees, two parallel bifurcating tubes, and the junctional tube, bypass, connecting four tubes. The velocity profile is clarified around the apex where cerebral aneurysm is apt to initiate. In particular, the variation of wall shear stress around the apex at one confluent tube with a high flow rate is estimated from the velocity profile near tube wall, and the relation between the wall shear stress and the generation of aneurysm is discussed physiologically.