Two-Phase Study Of Blood-Vessel And Blood Based On Fluid-Structure Interaction

In recent decades,vascular diseases have become an important class of diseases that endanger human health and are currently a hot issue in the field of biomechanics.Many scholars have used computational fluid dynamics as a basis to perform a large number of numerical calculations on the blood flow,especially the blood flow in the heart and arteries,and their effects on the surrounding tissues.In this paper,the interaction between blood vessel elasticity and blood flow was calculated by fluid-structure interaction method.The effects of gradients(blood vessels of different shapes)and mutations(hemangiomas)on the geometric boundary were mainly studied.Including three different blood vessel models and two different hemangiomas models under a pulsating blood flow,the size of their internal flow rate and the problem of deformation and destruction of the aneurysm.Research indicates:(1)Through the study of three different blood vessel models,it was found that the blood flow rate changes with the inlet velocity.When the entrance speed increases,the whole presents an increasing trend,and vice versa.And the position with the highest flow velocity is located at the axial center.Along both sides of the blood vessel wall and in the direction of the axis,the flow velocity shows a decreasing trend.(2)It was found through two different models of bending blood vessels that there was a phenomenon that the side of the curve had a large blood flow rate and a small flow rate on one side.And with the increase of the degree of bending,the more obvious this phenomenon,eventually leading to blood flow from stable laminar flow to unstable laminar flow;(3)The velocity of blood flow in both spindle and saccular aneurysm tumors is very low and the flow rate is stable,which makes it possible to form better deposition and adhesion conditions in the tumor.(4)The junction between the tumor and the downstream of the blood vessel is a dangerous place for destruction.The fusiform aneurysm will undergo shear destruction at the outer wall of the site,and the capsular aneurysm will be stretched and destroyed at the inner wall of the site.(5)Under the same blood flow action,there will be greater stress in the parent vessel of the capsular aneurysm,and therefore more prone to damage,and tensile failure will lead to more serious consequences.By comparing the internal flow characteristics of arterial blood vessels,the location where atherosclerosis can easily occur is obtained,which provides an important reference for the prevention of some vascular diseases.And the aneurysm and blood vessels are easily damaged at the junction,and the saccular aneurysm is highly dangerous and harmful.