We present simulation results of flows in the finite Knudsen range, that is in the slip and transition flow regime. Our implementations are based on the Lattice Boltzmann method and are accomplished within the Peano f...We present simulation results of flows in the finite Knudsen range, that is in the slip and transition flow regime. Our implementations are based on the Lattice Boltzmann method and are accomplished within the Peano framework. We validate our code by solving two- and three-dimensional channel flow problems and compare our results with respective experiments from other research groups. We further apply our Lattice Boltzmann solver to the geometrical setup of a microreactor consisting of differently sized channels and a reactor chamber. Here, we apply static adaptive grids to further reduce computational costs. We further investigate the influence of using a simple BGK collision kernel in coarse grid regions which are further away from the slip boundaries. Our results are in good agreement with theory and non-adaptive simulations, demonstrating the validity and the capabilities of our adaptive simulation software for flow problems at finite Knudsen numbers.展开更多
We couple different flow models,i.e.a finite element solver for the Navier-Stokes equations and a Lattice Boltzmann automaton,using the framework Peano as a common base.The new coupling strategy between the meso-and m...We couple different flow models,i.e.a finite element solver for the Navier-Stokes equations and a Lattice Boltzmann automaton,using the framework Peano as a common base.The new coupling strategy between the meso-and macroscopic solver is presented and validated in a 2D channel flow scenario.The results are in good agreement with theory and results obtained in similar works by Latt et al.In addition,the test scenarios show an improved stability of the coupledmethod compared to pure Lattice Boltzmann simulations.展开更多
文摘We present simulation results of flows in the finite Knudsen range, that is in the slip and transition flow regime. Our implementations are based on the Lattice Boltzmann method and are accomplished within the Peano framework. We validate our code by solving two- and three-dimensional channel flow problems and compare our results with respective experiments from other research groups. We further apply our Lattice Boltzmann solver to the geometrical setup of a microreactor consisting of differently sized channels and a reactor chamber. Here, we apply static adaptive grids to further reduce computational costs. We further investigate the influence of using a simple BGK collision kernel in coarse grid regions which are further away from the slip boundaries. Our results are in good agreement with theory and non-adaptive simulations, demonstrating the validity and the capabilities of our adaptive simulation software for flow problems at finite Knudsen numbers.
文摘We couple different flow models,i.e.a finite element solver for the Navier-Stokes equations and a Lattice Boltzmann automaton,using the framework Peano as a common base.The new coupling strategy between the meso-and macroscopic solver is presented and validated in a 2D channel flow scenario.The results are in good agreement with theory and results obtained in similar works by Latt et al.In addition,the test scenarios show an improved stability of the coupledmethod compared to pure Lattice Boltzmann simulations.
