Key result
In a model of 70% asymmetric arterial stenosis, the introduction of input disturbances reduced the calculated length of the separation zone by approximately 25% to about 4 channel diameters, matching experimental data and demonstrating local turbulence.
Experimental and numerical modeling of a 70% arterial stenosis demonstrates that incorporating input disturbances accurately captures the transition to local turbulence and secondary eddy formation in the post-stenotic region.
May refine post-stenotic flow models; leaves open clinical translation to patient risk.
The results of experimental studies and numerical simulation of the flow structure in the separation region downstream of an asymmetric narrowing of smooth canal that simulates 70% one-sided stenosis of the artery are presented. The Reynolds number was equal to 1800. The instantaneous flow velocity vector fields were measured using the SIV technique. The numerical solution was obtained by the large eddy simulation (LES) method. Setting the disturbances in numerical simulation close to the experimental conditions made it possible to obtain a satisfactory agreement between the calculated and experimental velocity fields and the components of the Reynolds stress tensor. The data on formation of the local flow turbulence region behind the constriction and subsequent downstream flow relaminarization are obtained. It is shown that a pair of secondary eddies localized within the region of flow separation is formed near the throat of the constriction.
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Молочников et al. (2023) studied Arterial stenosis. Asymmetric narrowing (70% stenosis) was evaluated on Length of the separation (recirculation) zone and flow turbulence. In a model of 70% asymmetric arterial stenosis, the introduction of input disturbances reduced the calculated length of the separation zone by approximately 25% to about 4 channel diameters, matching experimental data and demonstrating local turbulence.
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