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A Lattice Boltzmann Model for pulsative blood flow in elastic vessels

Ein Lattice-Boltzmann-Modell für pulsierenden Blutfluss in elastischen Gefäßen

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Lattice Boltzmann Models (LBM) are widely used to solve fluid mechanical problems in engineering applications. In this work a brief introduction of LBM is given and a new boundary condition is proposed for the cardiovascular domain to support elastic walls in order to simulate blood flow in elastic vessels. The flow field is calculated in two spatial dimensions revealing characteristic flow patterns and geometrical changes of the arterial walls for different time dependent input contours of pressure and flow. For steady flow the results are compared to the predictions of the model proposed by Fung which is an extension of Poiseuille's theory. For unsteady flow the model was validated with the solution given by Womersley. The results are very promising for relevant Reynolds and Womersley numbers.

Lattice-Boltzmann-Modelle (LBM) finden in der Strömungsmechanik Verwendung. In dieser Arbeit soll ein kurzer Überblick über LBM gegeben werden. Es wird eine neue Randbedingung vorgestellt, die es erlaubt, elastische Wände effektiv für Blutflusssimulationen zu modellieren. Dabei wird die Strömung zweidimensional im Ort als auch über die Zeit berechnet, was charakteristische Flussprofile sowie geometrische Veränderungen der Arterienwände für verschiedene Fluss- und Druckverhältnisse aufzeigt. Für stetigen Fluss werden die Ergebnisse mit einem analytischen Modell von Fung verglichen, das auf die Theorie von Poiseuille zurückgeht. Für pulsierenden Fluss wurde das Modell mit der Lösung von Womersley validiert. Die Ergebnisse sind sehr zufrieden stellend im Bereich der relevanten Reynolds- und Womersley-Zahlen.

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Leitner, D., Wassertheurer, S., Hessinger, M. et al. A Lattice Boltzmann Model for pulsative blood flow in elastic vessels. Elektrotech. Inftech. 123, 152–155 (2006). https://doi.org/10.1007/s00502-006-0332

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  • DOI: https://doi.org/10.1007/s00502-006-0332

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