Improved modeling techniques for arterial dynamics and blood flow
Schwaab, Matthew J.
Tezduyar, T. E.
Master of Science
The Team for Advanced Flow Simulation and Modeling (T☆AFSM) has recently applied its finite element methods for Fluid-Structure Interactions (FSI) to the simulation of blood flow and arterial mechanics. The Sequentially-Coupled Arterial FSI (SCAFSI) technique is one method developed for this purpose. The SCAFSI technique is an approximate FSI approach to simulating arterial mechanics which was created with the goal of reducing the computational cost of such simulations. The result was a flexible algorithm that can be adapted to better fit the case being computed. Two test cases were used to determine the effectiveness of the SCAFSI technique. The membrane model of an abdominal aortic aneurysm, originally created to test the extension of T☆AFSM's techniques for cerebral aneurysms to larger arteries, was the initial test case for the SCAFSI technique. The model of a middle cerebral-artery with aneurysm was used to extend SCAFSI for use with continuum structure elements. This test case also examined SCAFSI's potential to use different time step sizes for the fluid and structure parts of the computation. All cases tested showed few differences between the results of simulations computed with the various SCAFSI technique options and the Coupled Arterial FSI (CAFSI) technique. Furthermore, the SCAFSI technique showed potential for significant computational savings.
Biomedical research; Mechanical engineering; Applied sciences