Speaker
Ms
Jeannette Spühler
(KTH HPCViz)
Description
Computer simulation is emerging as a tool for increased understanding of normal heart
function and cardiac diseases, and also to serve as decision support in diagnostics
and treatment.
The multidisciplinary nature of this problem poses interesting challenges and brings
together expertise from various disciplines such as medicine, biomechanics, applied
mathematics and computer science. Today's research is focused on various subproblems
and the coupling of them in more complete models.
Our interest lies in modeling the blood flow in the left ventricle (LV) by a finite
element method.
The model geometry of the LV is based on ultrasound measurements of the position of
the inner wall of the LV at different time points during the cardiac cycle. We build
a three dimensional mesh of tetrahedrons at the initial time and use mesh smoothing
algorithms to deform the mesh so that it fits the moving surface geometry.
An adaptive ALE space-time finite element solver based on continuous piecewise linear
elements in space and time together with streamline diffusion stabilization is used
to simulate the blood flow by solving the incompressible Navier-Stokes equations.
The software used is the HPC branch of the open source FEM library DOLFIN and the
adaptive flow solver Unicorn. Both libraries have been parallelized using a hybrid
MPI+OpenMP approach.
In this talk we present recent work in enhancing the model by embedding the models of
the aortic valves and expanding the problem statement to the realm of fluid-structure
interaction.
Primary author
Ms
Jeannette Spühler
(KTH HPCViz)
