Large Eddy Simulations for blood fluid-dynamics in real stenotic carotids
Thursday 10th December 2015
Lancellotti, R.M.; Vergara, C.; Valdettaro, L.; Bose, S.; Quarteroni, A.
In this paper, we consider Large Eddy Simulations (LES) for human stenotic
carotids in presence of atheromasic plaque. It is well known that in such
a pathological condition, transitional effects to turbulence may occur, with
relevant clinical implications such as plaque rupture. The first aim of this
work is to provide a way to define a Direct Numerical Simulation (DNS).
In our context turbulence is not statistically homogeneous isotropic and
stationary. We define mesh size and time step by considering the reduced
model of a 2D shear layer. Then, we compare the performance of LES
model (both static and dynamic) and of mixed LES models (where also a
similarity model is considered) with that of DNS in a realistic scenario of
a carotid. The results highlight the effectiveness of the LES models in
terms of accuracy, especially for the static model.