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NekTar - Navier-Stokes Solver

PI: George Karniadakis, Brown University

Cardiovascular disease, including atherosclerosis, accounts for almost 50 percent of deaths in the western world. It is widely accepted that there is a casual relationship between the flow of blood and the formation of arterial disease such as atherosclerotic plaques. This area has received relatively little attention due to the the high computational demands of multiscale modelling of interactions of large-scale flow features coupled to cellular and sub-cellular biology.

Using a software package called Nektar, the Crunch group led by George Karniadakis at the Department of Applied Math at Brown University is engaged in modelling the three-dimensional unsteady fluid mechanics within sites of interest, such as arterial branches and the heart. Experience indicates that to capture the flow dynamics in an artery bifurcation typically requires a mesh of 70,000 to 200,000 spectral elements with polynomial order of 10 to 12. Recent simulations involved 55 main arteries and one million spectral elements. The ultimate goal is to model blood flow interaction in different regions of the cardiovascular system.

The CRUNCH group aims to establish a biomechanics gateway on the Teragrid (replaced by XSEDE) and make the arterial tree a platform and a simulation framework for further developments and systematic studies in hemodynamics, disease modeling, and drug delivery. In terms of high performance computing, one of the researchers' goals is to build a parallel numerical solver for arterial flow simulation suitable for Petascale computing.

The initial stage of the SAC collaboration is porting and optimizing Nektar for Blue Gene architecture.

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