Numerical study of pulsatile thermal magnetohydrodynamic blood flow in an artery with aneurysm using lattice Boltzmann method (LBM).

Aneurysm is considered as one of the most common cardiovascular diseases with an important mortality rate. It is a serious pathology caused by a dilatation in the arterial wall. In this work, the influence of magnetic field on pulsatile blood flow and heat transfer in an artery with aneurysm is studied using the mesoscopic lattice Boltzmann method with BGK approximation (LBGK). Human blood is regarded as non-Newtonian and modeled by Carreau–Yasuda rheological model. The model findings are compared with recent data from the literature and demonstrate a good level of agreement, which confirms the effectiveness and accuracy of the suggested model. Results are depicted in terms of streamlines, temperature contours and wall shear stress (WSS) variation, for the certain pertinent non-dimensional Reynolds and Hartmann numbers. The findings demonstrate that the heat transfer is enhanced in the inlet zone of the aneurysm as the Hartmann number increases. Furthermore, it is found that the application of a magnetic field reduces the recirculation zones and increase the WSS, which prevent the progression of vascular diseases and rupture in the aneurysm region.