English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

This work aims to apply Computational Fluid Dynamics (CFD) and Computational Structural Dynamics (CSD) to simulate the motions of bioprosthetic heart valves and the flow field around them. The major problem in the numerical simulation of heart valves is fluid-structure interaction between the valve leaflets and the surrounding blood flows. And due to the large displacement of heart valves, the flow phenomena during the dynamic opening and closing phases are highly complex. In this work, a novel and efficient immersed membrane method (IMM) is proposed for the simulation of fluidstructure interaction phenomena in heart valves. In the IMM, a stationary Eulerian mesh is used for the computation of fluid domain, while the heart valves are treated as thin structures immersed in the flow field moving on top of the background Eulerian mesh, without changing the topology and geometry of the mesh. To obtain accurate fluid conditions, the concept of ghost nodes with ghost values is introduced to account for discontinuities in pressures and fluid stresses across the valves. Velocity continuity at the fluid-structure interface is directly enforced by one-sided extrapolations of fluid velocity using the ghost nodes and the extrapolated velocities are treated as a boundary condition for the fluid domain. The fluid-structure interaction is solved in a staggered and iterative manner: first, the governing equations are solved for the fluid domain, after which fluid forces are calculated along the fluid-structure interface. Then the structure is updated under the influence of fluid forces to a new position with a new configuration. Lastly, the immersed membrane method is employed to obtain appropriate boundary conditions at the fluid-structure interface for the fluid domain with the newly updated VII ATTENTION: The Singapore Copyright Act applies to the use of this document. Nanyang Technological University Library

A three-dimensional computation of fluid-structure interaction in bioprosthetic heart valves using immersed membrane method