Research Of New Method Of Computer Simulation On Smoke-flute Based On Lattice Boltzmann

Lattice Boltzmann Method is a new numerical simulation to solve fluid flow in recent years. It favored by domestic and international academic widely because of simple boundary conditions, easy to implement and property of parallelism. Lattice Boltzmann method has been applied to many fields, such as fluid flow and heat transfer, multiphase flow, porous media flow and so on which traditional numerical methods cannot to solve and in some fields has achieved great success. Smoke flow is that many scholars to research of which previous models of Lattice Boltzmann considered the impact of gas relative particle only, while ignoring the relative particle flow of gas, for it we use a new coupled model to simulate the smoke flow in this paper.The main contents include the following three aspects:First, this paper compares the Lattice Boltzmann model of D2Q9, He_Lou, D2G9 and so on from accuracy, stability of numerical and convergent speed. The D2G9 model is the most accurately, steadiest and fastest from the results so that we choice it to simulate. In addition, from the results of comparing the format of the heuristic, dynamic format and format of non-equilibrium extrapolation the three different boundaries treatment, we are brought to the upshot that format of non-equilibrium extrapolation is the most obvious advantage. So when we process the physical boundary we use format of non-equilibrium extrapolation method.Second, we correct the model on D2G9 by double-coupling method. First, we calculate the distribution function of non-pellet gas flow field, and then calculated interaction force between vapor and particle by using PSIC. And take this external force to a the particle gas flow field to iterate, until the system reaches steady state. Then we can estimate distribution function and macro speed of the gas and particle. Using this coupled model on the mine tunnel to simulate the smoke flow and obtained satisfactory images.Finally, this paper proposal Separated & Coupled Algorithm. According to the different tunnel topology, divides it into several certain regular sub-regions. It evolutes independent in every sub-regions and swap data on the public side. Then we can estimate distribution function in every sub-regions and obtain the Simulation result. Beside we also proposal the parallel Algorithmic by using Separated & Coupled Algorithm in order to improve the computational efficiency of Lattice Boltzmann method.