This paper presents an unknown-index algorithm for the lattice Boltzmann method to solve unknowns on boundaries with irregular or fractal geometry in the fluid flows. This algorithm is easy implemented as well as the bounceback method, but the solutions of unknowns can be given by not only the bounceback assumption of all unknowns but also solving the governing equations. By this scheme, we simulate the flow past a cylinder in an unbounded domain and get consistent results with other literatures. Afterward we replace the cylinder by a two-dimensional Taiwan-island-like object with outlines similar to the irregular coasts. Both steady and unsteady flows with vortex shedding are discussed by evaluating the drag coefficients and Strouhal number via the momentum-exchange method.
|Number of pages||9|
|Journal||Journal of the Chinese Society of Mechanical Engineers, Transactions of the Chinese Institute of Engineers, Series C/Chung-Kuo Chi Hsueh Kung Ch'eng Hsuebo Pao|
|Publication status||Published - 2011 Dec 1|
All Science Journal Classification (ASJC) codes
- Mechanical Engineering