Sharif University of Technology Scientia Iranica 1026-3098 26 6 2019 12 01 Lattice Boltzmann simulation of blood flow properties and vessel geometry in open and closed vessels: A numerical study 3283 3292 20900 10.24200/sci.2018.50751.1851 EN H. Akhtari Shishavan Department of Mechanical Engineering, Urmia University, Urmia, Postal Code: 5756151818, Iran I. Mirzaee Department of Mechanical Engineering, Urmia University, Urmia, Postal Code: 5756151818, Iran. N. Pourmahmoud Department of Mechanical Engineering, Urmia University, Urmia, Postal Code: 5756151818, Iran. Journal Article 2018 04 09 In the present article, Lattice Boltzmann method is utilized to simulate two-dimensional incompressible viscous flow in an open and closed microchannel (vessel). The main focus of the present research is to study physical parameters of blood flow in a vessel. To find the effect of oscillatory flow inside the vessel, we take account of the Reynolds number from 0.05 to 1.5 for numerical computation in the present manuscript in an open straight vessel. In addition, the accuracy of Poiseuille Law is investigated for blood flow in open vessel too. For this purpose, the effect of the vessel diameter and blood viscosity on the blood flow is studied numerically. As extra results, the effect of blood injection to a coronary bifurcation with two closed ends are studied. The blood pressure drop is high at the beginning of the vessel (pressure variation is high between the adjacent points along the vessel), but after the path along the vessel, the speed of dropping pressure decreases and the pressure difference between the adjoining points decreases along the vessel. Finally, the present results have been compared with the available experimental and numerical results that show good agreements. https://scientiairanica.sharif.edu/article_20900_c64686d2c117c3a4b9c9b71236967a9a.pdf