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Dr. Tayfun E. Tezduyar Team for Advanced Flow Simulation and Modeling (T*AFSM) Mechanical Engineering, Rice University, Houston, Texas Friday, February 22, 2008 11:00-12:00 PM LWSN 3102A/B, Purdue University |
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Abstract We present an overview of how the arterial fluid mechanics problems can be modeled with the stabilized space-time fluid-structure interaction (SSTFSI) technique developed by the Team for Advanced Flow Simulation and Modeling (T*AFSM). The SSTFSI technique includes the enhancements introduced recently by the T*AFSM to increase the scope, accuracy, robustness and efficiency of this class of techniques. The SSTFSI technique is supplemented with a number of special techniques developed for arterial fluid mechanics modeling. These include a recipe for pre-FSI computations that improve the convergence of the FSI computations, using an estimated zero-pressure arterial geometry, and the Sequentially-Coupled Arterial FSI (SCAFSI) technique. The recipe for pre-FSI computations is based on the assumption that the arterial deformation during a cardiac cycle is driven mostly by the blood pressure. The SCAFSI technique, which was introduced as an approximate FSI approach in arterial fluid mechanics, is also based on that assumption. The need for an estimated zero-pressure arterial geometry is based on recognizing that the patient-specific image-based geometries correspond to time-averaged blood pressure values. In our arterial fluid mechanics modeling the arterial walls can be represented with the membrane or continuum elements, both of which are geometrically nonlinear, and the continuum element is made of hyperelastic (Fung) material. Test computations are presented for cerebral and abdominal aortic aneurysms and carotid-artery bifurcation, where the arterial geometries used in the computations are close approximations to the patient-specific image-based data. Dr. Tezduyar received his Ph.D. from Caltech in 1982. After postdoctoral work at Stanford, he had faculty positions at University of Houston and University of Minnesota. At Minnesota he became a full professor in 1991 and was named Distinguished McKnight University Professor in 1997. He joined Rice University in 1998 as James F. Barbour Professor in Mechanical Engineering and Materials Science. Dr. Tezduyar holds a 1986 Presidential Young Investigator Award from the National Science Foundation. He received the 1997 Computational Mechanics Award of the Japan Society of Mechanical Engineers, 1997 Computational Fluid Dynamics Award of the US Association for Computational Mechanics, and 1998 Computational Mechanics Award of the International Association for Computational Mechanics. He is a Fellow of the American Society of Mechanical Engineers, US Association for Computational Mechanics, International Association for Computational Mechanics, American Academy of Mechanics, and the School of Engineering at University of Tokyo. He was awarded an honorary doctorate from Slovak Republic. He is a member of the Executive Committee of the ASME Applied Mechanics Division and a corresponding member of the Executive Council of the International Association for Computational Mechanics. He is an Editor of Computational Mechanics and an Associate Editor of Mathematical Models and Methods in Applied Sciences and the ASME Journal of Applied Mechanics. Co-sponsored by The Cyber Center, The Rosen Center for Advanced Computing, The Advanced Computer Systems Laboratory and The Computational Science and Engineering Programs. |
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