Key result
Mooney-Rivlin hyperelastic models closely match linear elastic models in estimating low wall shear stress.
Why the study?
Fluid-structure interaction analysis can help understand stenosis mechanics and aid early diagnosis, but the effect of different arterial wall stiffness models on hemodynamics needed evaluation.
Absolute Event Rate: 6.95% vs 7.04%
In computational fluid-structure interaction models of the carotid artery, the choice of arterial wall material model (hyperelastic vs. linear elastic) significantly alters the prediction of hemodynamic parameters like wall shear stress, which are critical for predicting atherosclerosis progression.
Agreement supports simplified linear elastic models for carotid WSS estimation; leaves open human validation before clinical use.
Atherosclerosis is one of the most common cardiovascular diseases leading to high morbidity. The study of arterial dynamics using fluid–structure interaction (FSI) technique by taking into account the physiology of flow, the critical hemodynamic parameters can be determined which plays a crucial role in predictive medicine. Due to advances in the computational facilities, coupled field analysis such as FSI can facilitate understanding of the mechanics of stenosis progression and its early diagnosis. In this study a two-way FSI analysis is carried out using modified Navier–Stokes equations as the governing equations of blood flow for determining hemodynamic parameters. The arterial wall has been described at different linear elastic modulus and compared with hyperelastic Mooney–Rivlin model to evaluate the effect of different arterial stiffness on hemodynamics. The Mooney–Rivlin model predicts flow reduction with the severe backflow at arterial bifurcation resulting in decreased shear stress and oscillatory behavior. Furthermore, these findings may be used in understanding the advantages and disadvantages of using hyperelastic artery model in numerical simulations to better understand and predict the variable that causes cardiovascular diseases and as a diagnostic tool. In the present study, variation due to change in arterial wall properties such as linear elastic and Mooney Rivlin hyperelastic and its influence on hemodynamics are investigated.
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Kumar et al. (2021) studied Carotid artery hemodynamics / Atherosclerosis. Mooney-Rivlin hyperelastic material model vs. Linear elastic material models (0.3, 0.5, 0.9 MPa) was evaluated on Percentage total area where time-averaged wall shear stress is ≤ 0.4 Pa. The Mooney-Rivlin hyperelastic artery model estimated the low wall shear stress area at 6.95%, closely resembling the linear elastic model with 0.9 MPa stiffness (7.04%).
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