In the present article, a new approach is proposed to enhance the hybrid immersed boundary-lattice Boltzmann (IB-LB) method for simulation of two-dimensional incompressible viscous flows involving flexible immersed boundaries. The efficiency and accuracy of the proposed approach is justified through the simulation of the motion and deformation of two-dimensional red blood cell in a microchannel. In the case of conventional IB-LB method, the equation of solid immersed boundary has a certain mathematical formulation and it is not changed during the calculations. As a result, there are difficulties in the deformation of solid particle during its transmission especially in the sharp points. For this reason an innovation is applied in this research which solves this problem. Besides, after updating the Lagrangian points, the nodes can become too close to (or too far away from) each other, which may contribute and cause numerical instabilities. So, the boundary needs to be re-discretized. In order to represent the trace of the immersed boundary accurately in the absence of any sharp discontinuities, we regrid the updated Lagrangian points at each time step using spline interpolation. The presented computational results consent reasonably well with the available data in the literature.
کلید واژگان :Lattice Boltzmann, Immersed Boundary, Red Blood Cell, 2D Lid-Driven Cavity, Spline Interpolation
ارزش ریالی : 600000 ریال
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