Rupture of cerebral aneurysms causes subarachnoid hemorrhage, a severe form of stroke. These patients are at high risk of an acute ischemic event, described as cerebral vasospasm. Our understanding of which patients will develop symptomatic vasospasm, and when they do, is limited. Thus, there is a need to accurately predict which patients will require aggressive intervention with vasospasm. The goal of my research is to develop a model using computational fluid dynamics (CFD) that allows clinicians to identify which patients will develop symptomatic vasospasm.