Lattice Boltzmann Simulation Of Hemodynamics In Two Tandem Aneurysms

As one of the cardiovascular diseases, cerebral aneurysm has a high lethality and disability rate. It is seriously harmful for human health, so it is very important to study an effective treatment. The development of stent has opened a new situation for the treatment of cerebral aneurysms. Now, it is widely believed that the aneurysm’s growth and developed mechanism is closely related to hemodynamics. As cerebral aneurysm involves many factors, and planted stent has increased its complexity, so the effect method of studying cerebral aneurysm is needed urgently. Lattice Boltzmann method has natural parallelism, and is easy to deal with complex boundaries, so it is widely applied to the simulation of fluid. This thesis is focused on two tandem aneurysm to simulate its hemodynamics by lattice Boltzmann method.In this thesis, we simulate the hemodynamics of one cerebral aneurysm firstly, and contrast to the simulation of two tandem aneurysm. Then simplify the blood as Newtonian fluid to discuss the hemodynamic difference of four situations: the location of one of two tandem aneurysm, the interaction between the two tandem aneurysm, different types of stent and the distance between two tandem aneurysm.The main conclusions of this paper are as follows. Firstly, when blood flow is simplified as Newtonian fluid, the conclusions are: when two aneurysm models of tandem aneurysm are same, the flow states in the cavities are slightly different; the two tandem aneurysm influence each other; when only plant stent to one of two tandem aneurysm, the aneurysm without stent will be influenced; no matter which stent is planted, the neck average speed reduction is smaller than one aneurysm; the distance of two tandem aneurysm can effect its hemodynamics. Moreover, non-Newtonian effect on two tandem small-necked aneurysm largely.This thesis studies the two tandem aneurysm detailly by lattice Boltzmann method.To some extent, this study provide a theoretical basis for treatment of two tandem aneurysm, and also with with some reference value.