Journal ArticleDOI
Fluid---structure interaction simulation of pulsatile ventricular assist devices
Reads0
Chats0
TLDR
In this paper, a collection of fluid-structure interaction (FSI) computational techniques are presented to enable realistic simulation of pulsatile VADs, which involve dynamic interaction of air, blood, and a thin membrane separating the two fluids.Abstract:
In this paper we present a collection of fluid---structure interaction (FSI) computational techniques that enable realistic simulation of pulsatile Ventricular Assist Devices (VADs). The simulations involve dynamic interaction of air, blood, and a thin membrane separating the two fluids. The computational challenges addressed in this work include large, buckling motions of the membrane, the need for periodic remeshing of the fluid mechanics domain, and the necessity to employ tightly coupled FSI solution strategies due to the very strong added mass effect present in the problem. FSI simulation of a pulsatile VAD at realistic operating conditions is presented for the first time. The FSI methods prove to be robust, and may be employed in the assessment of current, and the development of future, pulsatile VAD designs.read more
Citations
More filters
Space-time finite element techniques for computation of fluid-structure interactions
TL;DR: In this paper, space-time finite element techniques were developed for computation of fluid-structure interaction (FSI) problems, including deforming-spatial-domain/stabilized space time (DSD/SST) formulation and mesh update methods, including the solid-extension mesh moving technique (SEMMT).
Journal ArticleDOI
Computational modeling of cardiac hemodynamics
Rajat Mittal,Jung Hee Seo,Vijay Vedula,Young Joon Choi,Hang Liu,H. Howie Huang,Saurabh Jain,Laurent Younes,Theodore P. Abraham,Richard T. George +9 more
TL;DR: The current status of computational modeling of cardiac hemodynamics as well as the emerging trends and challenges in cardiovascular health, computing, modeling and simulation and that are expected to play a key role in its future development are reviewed.
Journal ArticleDOI
Shape optimization of pulsatile ventricular assist devices using FSI to minimize thrombotic risk
TL;DR: The shape optimization study is designed to reduce thrombotic risk, a major clinical problem in PVADs, and uses the surrogate management framework, a derivative-free pattern search optimization method that relies on surrogates for increased efficiency.
Journal ArticleDOI
ST and ALE-VMS methods for patient-specific cardiovascular fluid mechanics modeling
Kenji Takizawa,Yuri Bazilevs,Tayfun E. Tezduyar,Christopher Long,Alison L. Marsden,Kathleen Schjodt +5 more
TL;DR: A review of the space–time (ST) and Arbitrary Lagrangian–Eulerian (ALE) techniques developed by the first three authors' research teams for patient-specific cardiovascular fluid mechanics modeling, including fluid–structure interaction (FSI).
Journal ArticleDOI
Space---time fluid mechanics computation of heart valve models
TL;DR: These computations demonstrate that the ST-TC method can bring interface-tracking accuracy to fluid mechanics of heart valves, and can do that with computational practicality.
References
More filters
Journal ArticleDOI
GMRES: a generalized minimal residual algorithm for solving nonsymmetric linear systems
Youcef Saad,Martin H. Schultz +1 more
TL;DR: An iterative method for solving linear systems, which has the property of minimizing at every step the norm of the residual vector over a Krylov subspace.
Journal ArticleDOI
Streamline upwind/Petrov-Galerkin formulations for convection dominated flows with particular emphasis on the incompressible Navier-Stokes equations
A. N. Brooks,Thomas J. R. Hughes +1 more
TL;DR: In this article, a new finite element formulation for convection dominated flows is developed, based on the streamline upwind concept, which provides an accurate multidimensional generalization of optimal one-dimensional upwind schemes.
Journal ArticleDOI
A Time Integration Algorithm for Structural Dynamics With Improved Numerical Dissipation: The Generalized-α Method
Jintai Chung,Gregory M. Hulbert +1 more
TL;DR: In this paper, a new family of time integration algorithms is presented for solving structural dynamics problems, denoted as the generalized-α method, which possesses numerical dissipation that can be controlled by the user.
Journal ArticleDOI
Multiscale phenomena: Green's functions, the Dirichlet-to-Neumann formulation, subgrid scale models, bubbles and the origins of stabilized methods
TL;DR: In this paper, an approach is developed for deriving variational methods capable of representing multiscale phenomena, which leads to the well-known Dirichlet-to-Neumann formulation.
Journal ArticleDOI
Lagrangian-Eulerian finite element formulation for incompressible viscous flows☆
TL;DR: In this paper, a finite element formulation for incompressible viscous flows in an arbitrarily mixed Lagrangian-Eulerian description is given for modeling the fluid subdomain of many fluid-solid interaction, and free surface problems.