Unlike conventional finite volume methods and finite element methods, Lattice Boltzmann methods (LBM) consider fluid as collective particles rather than continuum. The discrete Boltzmann equation is solved to simulate the flow of a Newtonian fluid with collision models on kinetic theory. By simulating streaming and collision processes across a finite number of particles, the intrinsic particle interactions evince a microcosm of viscous flow behavior applicable across the variable scale. Collisions between the fluid particles moving along the grid should be applied by explicit method and by the calculation of the time, so it represents unsteady flow field. In LBM method, fluid is considered as collective particles, thus, physical phenomenon can be described intuitively. Due to this merit, in describing interaction between fluids and other physical phenomenon, LBM can be applied in the form of a Lagrangian method which determines the movement by using the equations of motion. Conventional CFD, based on Navier-Stokes equations, has some negative elements: it takes a lot of time and effort in the process of configuring the mesh generation; its analysis results are easily affected at the quality of the created mesh; and it requires high degree of pre-analysis techniques such as sliding mesh or deformable mesh, in order to process the moving boundary. On the other hand, LBM does not required mesh to be created and pre-treatment is conducted automatically. Also it has positive elements such as its analysis results are not affected by the level of operator's skill.
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