In this study,the Lattice Boltzmann Method(LBM)is implemented through a finite-volume approach to perform 2-D,incompressible,and turbulent fluid flow analyses on structured grids.Even though the approach followed in t...In this study,the Lattice Boltzmann Method(LBM)is implemented through a finite-volume approach to perform 2-D,incompressible,and turbulent fluid flow analyses on structured grids.Even though the approach followed in this study necessitates more computational effort compared to the standard LBM(the so called stream and collide scheme),using the finite-volume method,the known limitations of the stream and collide scheme on lattice to be uniform and Courant-Friedrichs-Lewy(CFL)number to be one are removed.Moreover,the curved boundaries in the computational domain are handled more accurately with less effort.These improvements pave the way for the possibility of solving fluid flow problems with the LBM using coarser grids that are refined only where it is necessary and the boundary layers might be resolved better.展开更多
A Large Eddy Simulation (LES) approach based on the weakly compressible hydrodynamic equation with a single plase fluid model for the cavitation flow has been developed and employed in simulating 3 D unsteady viscou...A Large Eddy Simulation (LES) approach based on the weakly compressible hydrodynamic equation with a single plase fluid model for the cavitation flow has been developed and employed in simulating 3 D unsteady viscous flow through an orifice type spillwy tunnel. The finite volume approach in space and the predictor corrector method in time have been used to the numerical discretization, and the 'Law of wall' is applied at the solid boundary. The velocity, pressure fields and the cavitation phenomenon are obtained, the computational results show that 3 D LES approach can give more realistic flow field prediction of the orifice type spillway tunnel.展开更多
文摘In this study,the Lattice Boltzmann Method(LBM)is implemented through a finite-volume approach to perform 2-D,incompressible,and turbulent fluid flow analyses on structured grids.Even though the approach followed in this study necessitates more computational effort compared to the standard LBM(the so called stream and collide scheme),using the finite-volume method,the known limitations of the stream and collide scheme on lattice to be uniform and Courant-Friedrichs-Lewy(CFL)number to be one are removed.Moreover,the curved boundaries in the computational domain are handled more accurately with less effort.These improvements pave the way for the possibility of solving fluid flow problems with the LBM using coarser grids that are refined only where it is necessary and the boundary layers might be resolved better.
文摘A Large Eddy Simulation (LES) approach based on the weakly compressible hydrodynamic equation with a single plase fluid model for the cavitation flow has been developed and employed in simulating 3 D unsteady viscous flow through an orifice type spillwy tunnel. The finite volume approach in space and the predictor corrector method in time have been used to the numerical discretization, and the 'Law of wall' is applied at the solid boundary. The velocity, pressure fields and the cavitation phenomenon are obtained, the computational results show that 3 D LES approach can give more realistic flow field prediction of the orifice type spillway tunnel.