Abstract
A two-dimensional channel flow with different Reynolds numbers istested by using the lattice Boltzmann method under different pressureand velocity boundary conditions. The results show that the simulationerror increases, and the pressure and the flow rate become unstableunder a high Reynolds number. To improve the simulation precision undera high Reynolds number, the number of fluid nodes should be enlarged.For a higher Reynolds-number flow, the velocity boundary with anapproximately parabolic velocity profile is found to be more adaptive.Blood flow in an artery with cosine shape symmetrical narrowing is thensimulated under a velocity boundary condition. Its velocity, pressureand wall shear stress distributions are consistent with previousstudies.
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