Stent insertion for cerebral aneurysm has been studied using ideal and realistic aneurysms in recent years. Stent insertion aims at reducing the flow in an aneurysm. To minimize the average velocity in an aneurysm, we...Stent insertion for cerebral aneurysm has been studied using ideal and realistic aneurysms in recent years. Stent insertion aims at reducing the flow in an aneurysm. To minimize the average velocity in an aneurysm, we applied optimization to the strut position in a realistic aneurysm based on computational fluid dynamics. The result shows the effect on velocity reduction of strut placement in the inflow area.展开更多
In order to model the dispersal of volcanic particles in the atmosphere and their deposition on the ground,one has to simulate an advection-diffusionsedimentation process on a large spatial area.Here we compare a Latt...In order to model the dispersal of volcanic particles in the atmosphere and their deposition on the ground,one has to simulate an advection-diffusionsedimentation process on a large spatial area.Here we compare a Lattice Boltzmann and a Cellular Automata approach.Our results show that for high Peclet regimes,the cellular automata model produce results that are as accurate as the lattice Boltzmann model and is computationally more effective.展开更多
Fresh water is one of the most significant resources for human activities and survival,and irrigation is among the most important uses of water.The sustainibility and performance of irrigation canals can be greatly af...Fresh water is one of the most significant resources for human activities and survival,and irrigation is among the most important uses of water.The sustainibility and performance of irrigation canals can be greatly affected by sediment transport and deposition.In our previous works,we proposed a Lattice Boltzmann model for simulating a free surface flow in an irrigation canal,as an alternative to more traditional models mainly based on shallow water equations.Here we introduce the sedimentation phenomenon into our model by adding a new algorithm,based on the earlier work by B.Chopard,A.Dupuis and A.Masselot[9,11,12,27].Transport,erosion,deposition and toppling of sediments are taken into account and enable the global sedimentation algorithm to simulate different transport modes such as bed load and suspended load.In the present work,we study both the behaviour of a sediment deposit located at an underflow submerged gate(depending on the gate opening and the flow discharge)and the influence of the presence of such a deposit on the flow.Both numerical and experimental validations have been performed.The experiments were realized on the micro-canal of the LCIS laboratory at Valence,France.The comparisons between simulations and experiments give good qualitative agreement.展开更多
文摘Stent insertion for cerebral aneurysm has been studied using ideal and realistic aneurysms in recent years. Stent insertion aims at reducing the flow in an aneurysm. To minimize the average velocity in an aneurysm, we applied optimization to the strut position in a realistic aneurysm based on computational fluid dynamics. The result shows the effect on velocity reduction of strut placement in the inflow area.
基金supported by the Swiss National Science Foundation and the European Commission(COAST project EUFP6-IST-FET Contract 033664).
文摘In order to model the dispersal of volcanic particles in the atmosphere and their deposition on the ground,one has to simulate an advection-diffusionsedimentation process on a large spatial area.Here we compare a Lattice Boltzmann and a Cellular Automata approach.Our results show that for high Peclet regimes,the cellular automata model produce results that are as accurate as the lattice Boltzmann model and is computationally more effective.
文摘Fresh water is one of the most significant resources for human activities and survival,and irrigation is among the most important uses of water.The sustainibility and performance of irrigation canals can be greatly affected by sediment transport and deposition.In our previous works,we proposed a Lattice Boltzmann model for simulating a free surface flow in an irrigation canal,as an alternative to more traditional models mainly based on shallow water equations.Here we introduce the sedimentation phenomenon into our model by adding a new algorithm,based on the earlier work by B.Chopard,A.Dupuis and A.Masselot[9,11,12,27].Transport,erosion,deposition and toppling of sediments are taken into account and enable the global sedimentation algorithm to simulate different transport modes such as bed load and suspended load.In the present work,we study both the behaviour of a sediment deposit located at an underflow submerged gate(depending on the gate opening and the flow discharge)and the influence of the presence of such a deposit on the flow.Both numerical and experimental validations have been performed.The experiments were realized on the micro-canal of the LCIS laboratory at Valence,France.The comparisons between simulations and experiments give good qualitative agreement.
