Application Of Lattice Boltzmann Method In Some Fields

Lattice Boltzmann Method (LBM) is a mesoscopic method which is based on mass and momentum conversation to stimulate the flow field that under the condition of continuity equation of hydromechanics or Navier-Stokes equation. It is developed rapidly in the past decades. Instead of traditional stimulation method that is computational fluid dynamics (CFD), LBM takes its own advantage in simpler programming, less memory space of computer, easier to deal with complex boundary condition, suitable to do parallel operation and so on. Therefore, the LBM has a wide range of applications just as magnetofluid, chemical reaction flow, multiphase and multicomponent flow, porous flow etc. On the other hand GPU-LBM takes the advantage of parallel operation of LBM, make the calculating speed faster, so that it improves the ability to deal with practical issues accurately and effectively. This paper is focused on the preliminary exploration of the application of LBM in solar wall, proton exchange membrane fuel cell and turbulence, the details will be showing as following:1.Verify the Lattice Boltzmann Method with source term to investigate mass transfer and heat transfer in solar wall is suitable. Lattice Boltzmann method can be used for simulating of complex flow in a solar wall system which includes porous media flow and heat transfer. Besides the lattice Boltzmann equation (LBE) for time evolution of particle distribution function for flow field, after introducing an analogy, LBE for time evolution of distribution function for temperature can be got. Both temperature fields of fluid (air) and solid (porous media) are modeled. The effects of fan velocity, solar radiation intensity, porosity, etc. on the thermal performance of the UTC was studied. In general, our simulation results are in good agreement with what in literature. With the current system setting, both fan velocity and solar radiation intensity have significant effect on the thermal performance of the UTC. Further examinations of thermal performance in different UTC systems are ongoing. The results are expected to present in near future.2.Two different unglazed transpired solar air collectors are presented and analyzed. The heat and mass transfer are calculated to determine the performance characteristics such as the collector efficiency, heat exchange effectiveness, and air temperature rise. The different boundary conditions for the two cases have a significant effect on the performance. On the other hand, the thermal analysis is useful for optimizing the design and predicting the performance characteristics of the collectors under different operating conditions.3.The third part of the work is mainly about doing some researches about transport phenomena in the proton exchange membrane fuel cell by source LBM and verify this method is reliable, at the same time, the test of a series of relevant physical parameters characterized the fuel cell performance is in order to lay a certain foundation to optimizing the structure of proton exchange membrane fuel cell.4.Verify the model based on the finished GPU-LBM code is reasonable to rotating turbulence. GPU-LBM method is used in this part to investigate the characteristics of inverse energy transfer of isotropic turbulence with and without rotation. We validate the model through the way of energy scaling and characteristics of rotating turbulence. Meanwhile, through the comparison of calculation accuracy and operation speed between GPU-LBM and LBM in the same case,we can find GPU-LBM has its own advantage in stimulating3D problems.