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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 43: Colloids and Complex Liquids II

CPP 43.2: Vortrag

Donnerstag, 25. März 2010, 14:15–14:30, H39

A simplified particulate model for coarse-grained hemodynamics simulations — •Florian Janoschek, Jens Harting, and Federico Toschi — Department of Applied Physics, Eindhoven University of Technology, The Netherlands

Simulation of human blood flow is a demanding task both in terms of the complexity of applicable models and the computational effort. One reason is the particulate nature of blood which in first approximation may be treated as a suspension of red blood cells (RBCs) in blood plasma. A second reason is that in realistic geometries typical length scales vary over several orders of magnitude. Usual computational models either cope with this complexity by implementing only a homogenous although maybe non-Newtonian fluid or highly resolve relatively small numbers of RBCs by means of deformable meshes.

Our goal is to develop a coarse-grained and highly efficient yet still particulate model for blood that allows us to simulate up to millions of cells on current parallel supercomputers. We start with a lattice Boltzmann based simulation method for suspensions of rigid particles to account for long-range hydrodynamic interactions. Since real RBCs are not rigid we add anisotropic model potentials to cover the more complex short-range behavior of deformable cells on a phenomenological level. The benefit of the new model lies in the application to multi-scale problems in realistic geometries requiring particulate resolution in some regions and in the opportunity to investigate statistical and time dependent effects in soft particle suspensions like blood. We will present an overview of the model and its rheological properties.