Author Archives: Boyce Griffith

Mike’s paper, Fluid-Structure Interaction Models of Bioprosthetic Heart Valve Dynamics in an Experimental Pulse Duplicator, has been accepted to appear in Annals of Biomedical Engineering. (A preprint is available on engrXiv.) This paper uses IBAMR’s version of the immersed finite element method to simulate the dynamics of bioprosthetic heart valves (BHVs) in the aortic test section of experimental pulse duplicator systems. An initial experimental validation of the models is demonstrated through comparisons to data on pressures, flow rates, and leaflet kinematics. The paper also contrasts the flow patterns and leaflet strains and stresses generated by porcine tissue and bovine pericardial BHVs, and demonstrates the ability of the model to capture the large scale flow features.

Congratulations, Mike!

Congratulations to Ben Vadala-Roth, who successfully completed his oral qualifying exam on stabilization methods that improve the accuracy of nonlinear solid mechanics formulations used in the immersed finite element method and their application to modeling bicuspid aortic valves!

Our review paper with Neelesh Patankar (Northwestern) on immersed approaches to fluid-structure interaction is now in press at Annual Review of Fluid Mechanics.

Congratulations to Yanni Lai for successfully defending her thesis, Multigrid Methods for the Bidomain Equations! Yanni is now finishing up some final revisions to her written thesis as the last step before completing her PhD requirements.

We are trilled to announce that we just received notification of a new $1.3M award through the NSF Cyberinfrastructure for Sustained Scientific Innovation program. This project will develop multiphase and low Mach number flow simulation capabilities in the IBAMR software and will re-engineer IBAMR to scale to 1000’s of cores and beyond. These capabilities will enable specific applications, including biological applications along with wave-energy converter devices and additive manufacturing (3D printing).

This is a collaborative project that will be carried out with teams of researchers at Northwestern University (PI: Neelesh Patankar), San Diego State University (PI: Amneet Bhalla), and University at Buffalo (PI: Matt Knepley).

Amin Kolahdouz’s paper, An immersed interface method for discrete surfaces, has been accepted to appear in the Journal of Computational Physics. (A preprint is available on the arXiv.) This paper develops an extension of the immersed interface method (IIM) that is specialized to discrete surface representations, such as triangulated surfaces. It also establishes through extensive numerical examples that IIMs that use only the lowest-order jump conditions (for the pressure and viscous shear stress) at immersed interfaces are able to yield global second-order convergence rates.

Congratulations, Amin!

Congratulations to Aaron Barrett for successfully defending his thesis, An Adaptive Viscoelastic Fluid Solver: Formulation, Verification, and Applications to Fluid-Structure Interaction! Aaron is off to a postdoctoral position at the University of Utah in July.

Congratulations to Mike Lee, who successfully completed his oral qualifying exam on fluid-structure interaction models of bioprosthetic heart valves and in vitro validation of computational models of cardiovascular fluid dynamics!