By Zhaoli Guo
Lattice Boltzmann strategy (LBM) is a comparatively new simulation strategy for the modeling of advanced fluid platforms and has attracted curiosity from researchers in computational physics. in contrast to the conventional CFD tools, which remedy the conservation equations of macroscopic houses (i.e., mass, momentum, and effort) numerically, LBM versions the fluid together with fictive debris, and such debris practice consecutive propagation and collision procedures over a discrete lattice mesh.
This booklet will conceal the elemental and functional software of LBM. the 1st a part of the e-book involves 3 chapters beginning shape the speculation of LBM, easy versions, preliminary and boundary stipulations, theoretical research, to enhanced versions. the second one a part of the booklet comprises six chapters, handle purposes of LBM in quite a few elements of computational fluid dynamic engineering, masking parts, equivalent to thermo-hydrodynamics, compressible flows, multicomponent/multiphase flows, microscale flows, flows in porous media, turbulent flows, and suspensions.
With those insurance LBM, the e-book meant to advertise its functions, rather than the conventional computational fluid dynamic method.
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Additional info for Lattice Boltzmann Method and its Applications in Engineering
We first consider the LBGK models. The LBGK equation gives that fi(neq ) (x, t ) = −τ fi (x + ci δt , t + δt ) − fi (x, t ) . 4) where Di = ∂t + ci ⋅ ∇ . 5) Initial and Boundary Conditions for Lattice Boltzmann Method 37 where the expansion parameter ε is proportional to the Knudsen number which is very small for continuum flows. 6) where j =ρu. In the above equation ∂fi(eq ) /∂ρ and ∂fi(eq ) /∂j can be evaluated exactly from the expressions of fi(eq ) . 8) . The temporal and spatial derivatives in Eq.
Firstly, although LBE aims to solve continuum flows at macroscopic scales, it is developed based on microscopic models (LGA) or kinetic theory (Boltzmann equation). This feature suggests that the LBE has the potential to model nonequilibrium flows which cannot be described by the Navier-Stokes equations. Secondly, the kinetic nature of LBE makes it suitable for describing the internal interactions among fluid particles and those between the fluid and external environment, and this brings great advantages in simulating complex flows such as multi-component/phase flows and flows in porous media.
16)). Usually a LBE with such a collision operator is called lattice BGK (LBGK) or single-relaxation-time (SRT) model. Unlike previous LBE models, the EDF in LBGK model is completely independent of LGA method, and can be constructed with some freedoms such that the corresponding hydrodynamic equations satisfy the desired ones. Therefore, the choice of the equilibrium distribution function is one of the key problems in LBGK method. , ρ= ∑f i i = ∑f (eq ) i ρu = , i ∑c f i i i = ∑c f (eq ) i i . 41) i The use of the BGK collision operator enhances greatly the computational efficiency of LBE, and makes the implementation of the collision process much easier than other models.