Massively parallel finite element computation of 3d flows - mesh update strategies in computation of moving boundaries and interfaces°†

Tezduyar, Tayfun E.; Aliabadi, Shahrouz; Behr, Marek; Johnson, Arthur M.; Mittal, Sanjay

doi:10.1016/b978-044481999-4/50131-6

Cited by 4 publications

(3 citation statements)

References 13 publications

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“…One solution is re-meshing, i.e., generating a new mesh for the fluid sub domain whenever its deformation becomes too extreme. 102104,206 This allows computations to proceed, but introduces additional computational cost and numerical errors associated with the projection of fluid solutions from old to new meshes. Recent work by Takizawa et al .…”

Section: Computational Simulationsmentioning

confidence: 99%

Biomechanical Behavior of Bioprosthetic Heart Valve Heterograft Tissues: Characterization, Simulation, and Performance

Soares

Feaver

Zhang

et al. 2016

Cardiovasc Eng Tech

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The use of replacement heart valves continues to grow due to the increased prevalence of valvular heart disease resulting from an ageing population. Since bioprosthetic heart valves (BHVs) continue to be the preferred replacement valve, there continues to be a strong need to develop better and more reliable BHVs through and improved the general understanding of BHV failure mechanisms. The major technological hurdle for the lifespan of the BHV implant continues to be the durability of the constituent leaflet biomaterials, which if improved can lead to substantial clinical impact. In order to develop improved solutions for BHV biomaterials, it is critical to have a better understanding of the inherent biomechanical behaviors of the leaflet biomaterials, including chemical treatment technologies, the impact of repetitive mechanical loading, and the inherent failure modes. This review seeks to provide a comprehensive overview of these issues, with a focus on developing insight on the mechanisms of BHV function and failure. Additionally, this review provides a detailed summary of the computational biomechanical simulations that have been used to inform and develop a higher level of understanding of BHV tissues and their failure modes. Collectively, this information should serve as a tool not only to infer reliable and dependable prosthesis function, but also to instigate and facilitate the design of future bioprosthetic valves and clinically impact cardiology.

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Section: Computational Simulationsmentioning

confidence: 99%

Biomechanical Behavior of Bioprosthetic Heart Valve Heterograft Tissues: Characterization, Simulation, and Performance

Soares

Feaver

Zhang

et al. 2016

Cardiovasc Eng Tech

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“…However, as it had been already discussed, maintaining mesh quality is a difficult task in a boundary-fitted simulation of BHV, where flexible leaflets deform and contact each other. The problem for handling extreme deformations can be solved by generating a new mesh for the fluid domain through the re-meshing process [112, 113, 114, 115]. However, this introduces additional computational cost for calculation of the mesh motion and also causes some numerical errors due to artificial diffusivity associated with the projection of fluid solutions from the old to the new mesh.…”

Section: Simulation Approaches For Bhvmentioning

confidence: 99%

Computational methods for the aortic heart valve and its replacements

Zakerzadeh

Hsu

Sacks

2017

Expert Review of Medical Devices

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Replacement with a prosthetic device remains a major treatment option for the patients suffering from heart valve disease, with prevalence growing resulting from an ageing population. While the most popular replacement heart valve continues to be the bioprosthetic heart valve (BHV), its durability remains limited. There is thus a continued need to develop a general understanding of the underlying mechanisms limiting BHV durability to facilitate development of a more durable prosthesis. In this regard, computational models can play a pivotal role as they can evaluate our understanding of the underlying mechanisms and be used to optimize designs that may not always be intuitive. Areas covered: This review covers recent progress in computational models for the simulation of BHV, with a focus on aortic valve (AV) replacement. Recent contributions in valve geometry, leaflet material models, novel methods for numerical simulation, and applications to BHV optimization are discussed. This information should serve not only to infer reliable and dependable BHV function, but also to establish guidelines and insight for the design of future prosthetic valves by analyzing the influence of design, hemodynamics and tissue mechanics. Expert commentary: The paradigm of predictive modeling of heart valve prosthesis are becoming a reality which can simultaneously improve clinical outcomes and reduce costs. It can also lead to patient-specific valve design.

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“…It follows the motion of the cylindrical subdomain, but with the spinning component of the motion removed. The fluid mechanics mesh motion in the interior of the two subdomains is governed by the equations of elastostatics with Jacobian-based stiffening [43,57,[64][65][66][67] to preserve the aerodynamic mesh quality.…”

Section: Discretization and Special Fsi Techniques Formentioning

confidence: 99%

Fluid–Structure Interaction Modeling of Vertical-Axis Wind Turbines

Bazilevs

Korobenko

Deng

et al. 2014

Journal of Applied Mechanics

123

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Full-scale, 3D, time-dependent aerodynamics and fluid-structure interaction (FSI) simulations of a Darrieus-type vertical-axis wind turbine (VAWT) are presented. A structural model of the Windspire VAWT (Windspire energy, http://www.windspireenergy.com/) is developed, which makes use of the recently proposed rotation-free Kirchhoff-Love shell and beam/cable formulations. A moving-domain finite-element-based ALE-VMS (arbitrary Lagrangian-Eulerian-variational-multiscale) formulation is employed for the aerodynamics in combination with the sliding-interface formulation to handle the VAWT mechanical components in relative motion. The sliding-interface formulation is augmented to handle nonstationary cylindrical sliding interfaces, which are needed for the FSI modeling of VAWTs. The computational results presented show good agreement with the field-test data. Additionally, several scenarios are considered to investigate the transient VAWT response and the issues related to self-starting.

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Massively parallel finite element computation of 3d flows - mesh update strategies in computation of moving boundaries and interfaces°†

Cited by 4 publications

References 13 publications

Biomechanical Behavior of Bioprosthetic Heart Valve Heterograft Tissues: Characterization, Simulation, and Performance

Biomechanical Behavior of Bioprosthetic Heart Valve Heterograft Tissues: Characterization, Simulation, and Performance

Computational methods for the aortic heart valve and its replacements

Fluid–Structure Interaction Modeling of Vertical-Axis Wind Turbines

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