Numerical Simulation Of Hemolysis:
A Comparison Of Lagrangian And
Eulerian Modelling
Author(s)
S. Pirker, H. Schima & M. Stoiber
Abstract
In rotary blood pumps the degree of hemolysis is of crucial importance.
Therefore, it would be desirable to account for flow induced hemolysis by means
of numerical simulations in an early design stage.
In this paper two numerical simulation methods for the simulation of
hemolysis are proposed. Hereby, a Lagrangian approach based on tracking
distinct erythrocytes is compared to an Eulerian approach in which the
erythrocytes are treated as a continuous species. Both models account for the
local instantaneous stress as well as the stress exposure time.
The basic functionality and consistency of the above models is shown by
simple test geometry. In a second step the Eulerian method is applied for the
simulation of unsteady hemolysis in a rotary blood pump.
Keywords: CFD-simulation, rotary blood pump, hemolysis, Lagrangian
modelling, Eulerian modelling, unsteady hemolysis.
1 Introduction
In recent years numerical flow simulations (CFD) have proven to be a valuable
tool in designing artificial organs, i.e. rotary blood pumps (e.g. [1-3]. On one
hand classical design criteria like pumping efficiency, pressure head and
hydraulic losses can be addressed. One the other side flow induced hemolysis
can be investigated.
In this paper two mathematical methods, namely the Lagrangian and the
Eulerian approach, for the simulation of hemolysis are introduced and compared
to each other. The principal functionality of the models is shown by a simple
Keywords
CFD-simulation, rotary blood pump, hemolysis, Lagrangian
modelling, Eulerian modelling, unsteady hemolysis.
Related Book
Other papers in this volume
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