A laboratory model reproducing the main characteristics of the heart pump was used to investigate the flow in a ventricle model during a cardiac cycle. Velocity fields were measured both in Lagrangian and Eulerian frames of reference by using image analysis. In particular, by imaging the flow field from two orthogonal views, we were able to verify the asymmetric structure of the ventricular filling. The flow features were investigated considering Lagrangian based methodologies: Finite Time and Finite Size Lyapunov Exponents were evaluated to assess Lagrangian Coherent Structure time evolution and flow dispersion properties, respectively. These quantities have proven to be powerful tools to elucidate the complex dynamics associated with the intraventricular flow. (c) 2012 Published by Elsevier Masson SAS.
A Lagrangian investigation of the flow inside the left ventricle / Espa, Stefania; M. G., Badas; Fortini, Stefania; Querzoli, Giorgio; Cenedese, Antonio. - In: EUROPEAN JOURNAL OF MECHANICS. B, FLUIDS. - ISSN 0997-7546. - STAMPA. - 35:Cardiovascular Flows(2012), pp. 9-19. (Intervento presentato al convegno Cardiovasular Fluid Mechanics: from theoretical aspects to diagnostic and therapeutic support tenutosi a Cagliari nel 27-29/7/2011) [10.1016/j.euromechflu.2012.01.015].
A Lagrangian investigation of the flow inside the left ventricle
ESPA, Stefania;FORTINI, STEFANIA;QUERZOLI, GIORGIO;CENEDESE, Antonio
2012
Abstract
A laboratory model reproducing the main characteristics of the heart pump was used to investigate the flow in a ventricle model during a cardiac cycle. Velocity fields were measured both in Lagrangian and Eulerian frames of reference by using image analysis. In particular, by imaging the flow field from two orthogonal views, we were able to verify the asymmetric structure of the ventricular filling. The flow features were investigated considering Lagrangian based methodologies: Finite Time and Finite Size Lyapunov Exponents were evaluated to assess Lagrangian Coherent Structure time evolution and flow dispersion properties, respectively. These quantities have proven to be powerful tools to elucidate the complex dynamics associated with the intraventricular flow. (c) 2012 Published by Elsevier Masson SAS.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
