Flow Field Simulation For Wall Flow Particle Trap Based On LBM Diesel

In recent decades,the domestic automobile industry has developed rapidly.The diesel engine of the vehicle has occupied an absolute leading position in the field of heavy-duty vehicles due to its advantages of good power,good fuel economy and great potential for emission performance transformation.At the same time,diesel engines have caused serious environmental pollution problems,and the problem of particulate emissions has been highly valued by people.In order to cope with this severe situation and to meet increasingly stringent emission regulations,the particulate control technology of diesel engines has become the focus of research.Particle trap(DPF)technology is recognized as one of the most effective means to solve diesel particulate emissions problems due to its high filtration efficiency and good reliability.At present,most of the simulation studies on particle traps focus on the macroscopic level,but the particles in diesel exhaust are often in the micron range.The experimental study of micron level is relatively complex.Therefore,it is meaningful to simulate the particle trap at the pore scale.In this paper,a three-dimensional particle trap model is generated by stochastic configuration method.Based on the Volumetric Lattice Boltzmann Method,a new numerical simulation method developed on the basis of the traditional LBM method,the algorithm and programming program are designed.Because of the complex structure of porous dielectric filter and the large three-dimensional simulation calculation domain of wall flow particulate trap,the traditional serial computation often has the problem of large time consumption.In this paper,using GPU general computing technology,the algorithm is improved based on CUDA computing model.And the algorithm is further optimized from three directions of dynamic allocation of CPU memory,access to global storage and register allocation.At the pore scale,the simulation study of the pore model of the diesel engine wall flow honeycomb ceramic Particulate trap is carried out from three aspects,mainly from the porosity of the filter body,the thickness of the filter body and the velocity of the inlet orifice to the flow field in the pore model,in order to provide some reference for the simulation study of the particulate catcher.