Hemodynamic comparisons in pulmonary artery stenosis under different porosities

Pulmonary artery stenosis is closely related to hemodynamics. The effects of porosity on hemodynamics in pulmonary artery stenosis are investigated in this work. A real human pulmonary artery stenosis model is established and the computational domain is formed according to CT images of the right lower pulmonary artery. The stenosis is simulated by porous media, and the fluid-structure coupling method is used, considering the effects of different porosities on quantitative pulmonary pressure ratio (QPPR) and hemodynamics of pulmonary artery stenosis. The inlet velocity and the outlet pressure are given. On the interface of fluid-solid coupling, it is assumed that the motions of the fluid and wall are the same, and there is no sliding. The results show that QPPR is, respectively, 0.5812, 0.6556, and 0.6606 under the 0.3, 0.5, 0.8 porosities. This study proves that porosity has a great influence on the QPPR and hemodynamics of stenosed artery, and it is a non-negligible factor. The numerical results of this paper provide a potential theoretical basis for the diagnosis and treatment of pulmonary stenosis.