Tayfun E. Tezduyar on the SCAFSI Technique
New Hot Paper Commentary, November 2010
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Article: Sequentially-Coupled Arterial Fluid-Structure Interaction (SCAFSI) technique
Authors: Tezduyar, TE;Schwaab, M;Sathe,
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Tayfun E. Tezduyar talks with ScienceWatch.com and answers a few questions about this month's New Hot Papers paper in the field of Computer Science.
Why do you think your paper is highly
cited?
I think the paper is highly cited because arterial fluid-structure interaction (AFSI) modeling has been popular in recent years, sequentially-coupled arterial fluid-structure interaction (SCAFSI) is a promising approach, and we have quite a few collaborators who can relate to this work.
Does it describe a new discovery, methodology, or synthesis of knowledge?
Figure 1:
WSS distribution computed with the CAFSI technique. The
color range from blue to red corresponds to the WSS values ranging from low
to high.
Figure 2:
WSS distribution computed with the SCAFSI technique,
which is a less costly computational technique but yields results close to
those obtained with the CAFSI technique.
The paper describes the early stages of our research on the SCAFSI technique, which is a new methodology. The objective is reliable and efficient patient-specific computer modeling of blood flow and arterial dynamics in cerebral aneurysms. Because the blood flow depends on the arterial shape and the arterial deformation depends on the forces exerted by the blood on the arterial wall, the equations governing the two systems need to be solved in a coupled fashion.
In one version of the SCAFSI computation [1], first we compute the problem with a coarse fluid mechanics mesh and a (fully) coupled arterial FSI (CAFSI) technique. With the time-dependent arterial deformation coming from that step, we do a stand-alone fluid mechanics computation with a more refined mesh for the purpose of obtaining a more accurate blood flow solution, including the wall shear stress (WSS) distribution.
Would you summarize the significance of your paper in layman's terms?
Effective computer modeling of cerebral aneurysms will give the surgeons more information and tools in making decisions and coming up with surgical procedures.
How did you become involved in this research, and how would you describe the particular challenges, setbacks, and successes that you've encountered along the way?
Our team got involved in this research because we have some powerful FSI techniques that we wanted to apply to medical problems. We have a good team of researchers (Dr. Kenji Takizawa and 2LT Tyler Brummer) focusing on this class of problems and a very talented surgeon collaborator (Dr. Peng R. Chen) who provides us patient-specific images and medical-research guidance.
Where do you see your research leading in the future?
We are working on different versions of the SCAFSI technique, which will be described in a future paper, and we highlight the preliminary results in Figures 1 and 2 (above). The figures show the WSS distribution for a patient-specific cerebral aneurysm model, computed with the CAFSI and SCAFSI techniques. We are also investigating how the arterial dynamics and blood flow vary between different aneurysms [2].
Do you foresee any social or political implications for your research?
Yes, this kind of computer modeling can help save lives.
Tayfun E. Tezduyar
James F. Barbour Professor in Mechanical Engineering
Rice University
Houston, Texas, USA
Web
References:
[1] T.E. Tezduyar, K. Takizawa, C. Moorman, S. Wright and J. Christopher, "Multiscale Sequentially-Coupled Arterial FSI Technique", Computational Mechanics, 46 (2010) 17-29.
[2] K. Takizawa, C. Moorman, S. Wright, J. Purdue, T. McPhail, P.R. Chen, J. Warren and T.E. Tezduyar, "Patient-Specific Arterial Fluid-Structure Interaction Modeling of Cerebral Aneurysms", International Journal for Numerical Methods in Fluids, published online, May 2010, DOI: 10.1002/fld.2360.
KEYWORDS: CARDIOVASCULAR FLUID MECHANICS; FLUID-STRUCTURE INTERACTIONS; FINITE ELEMENTS; SPACE-TIME METHODS; SEQUENTIALLY-COUPLED ARTERIAL FSI, INCOMPRESSIBLE-FLOW COMPUTATIONS; FINITE-ELEMENT FORMULATION; NAVIER-STOKES EQUATIONS; MOVING BOUNDARY FLOWS; SPACE-TIME PROCEDURE; INTERFACES; PRESSURE; SYSTEMS; SIMULATIONS; MECHANICS.