Computational Fluid Dynamics Analysis In The Intracranial Aneurysm

The incidence rate of cardiovascular diseases appears to berising.Cardiovascular disease deaths accounted for the first cause of death inurban and rural residents, in the future the number of cardiovascular diseasepatients will be rapid growth.We should be fully aware of the dangers ofcardiovascular disease.It will be of important significance to strengthen the basicresearch of cardiovascular disease and to explore the new treatment ofcardiovascular disease.This article establishes3D pathological vessel and normal blood vesselthrough a patient’s MRA data. liquid-solid coupled method andcomputer fluid dynamic theory is applied in the article.We use AnsysWorkbench software to simulate transient fluid-structure coupling betweenvessel and blood flow.The results include that the maximum blood flow velocityhave occurred in the inside of the blood vessels.the spiral flow occurs in thearterial aneurysm during the circle, while the size and position change all the time. The wall shear stress (WSS) distribution is extremely complex in normalvessel where aneurysm take place.It’s occurs high WSS where the blood pushingforward through the aneurysm neck in the pathological vessel.The dome of theaneurysm has relatively high WSS,while the rest places of the aneurysm havevery low WSS.The maximum deformation and its place doesn’t take placewhere aneurysm occurs,which indicates that vessel deformation can’t predictthe place where aneurysm occurs.At last this article discusses the porosity rates of bare-metal stents affect thehemodynamics in the aneurysm under steady flow by Fluent software. Foursimplified stents which deployed in the aneurismal sac are studied and comparedin terms of flow velocity, WSS and pressure distributions.The blood velocity correlated well with the porosity of the stents. The lowporosity rate of stent can effectively isolate aneurysm model and reduce velocityin the aneurysm to prevent intracranial aneurysm from rupturing.