A resolved CFD-DEM method is proposed to simulate the fluid-particle interaction for large complex granules.The airflow in a vertical sinter fixed bed is numerically studied using this method.The multi-sphere clumped ...A resolved CFD-DEM method is proposed to simulate the fluid-particle interaction for large complex granules.The airflow in a vertical sinter fixed bed is numerically studied using this method.The multi-sphere clumped method is used to create irregular sinter particles in DEM.The immersed boundary method and dynamic cell refinement are applied to describe the fluid flow around particles with higher resolution,by which the fluid-particle interaction can be simulated more accurately.The simulation results presented the packing voidage distributions and the airflow fields in the sinter beds of different single and mixed particle size ranges.The bed pressure drops were simulated and the results were compared with the corresponding experimental ones.The good agreement indicated that the proposed resolved CFD-DEM method is an effective tool to model the fluid-particle interaction for irregular large granules in the gas-solid multi-phase systems.展开更多
Landscape process and pattern are closely related, hence recognition of landscape pattern is very important to recognize landscape process, and vice versa. Two new methods have been introduced: variable clumping metho...Landscape process and pattern are closely related, hence recognition of landscape pattern is very important to recognize landscape process, and vice versa. Two new methods have been introduced: variable clumping method (VCM) and variable core area method (VCAM) which may be used to analyze spatial structure of landscape. VCM is used to quantify patch distribution while VCAM is for quantifying patch shape. To evaluate these methods, two different landscapes in southwestern Japan were applied. Saijo is selected as agricultural landscape and Hiwa is selected for region of mountainous rural landscape. By applying the two methods, several landscape elements showed that spatial structures depend on spatial scales. It can be concluded that the two tested methods are effective in understanding the characteristics of landscape structure which are difficult to detect by traditional analytic methods.展开更多
基金the financial support for this work from the National Natural Science Foundation of China(grant No.52104340)China Postdoctoral Science Foundation(grant No.2020M672425)+1 种基金The Key Research and Development Program of Hubei Province(grant No.2022BCA058)Natural Science Foundation of Hubei Province(grant No.2020CFB133).
文摘A resolved CFD-DEM method is proposed to simulate the fluid-particle interaction for large complex granules.The airflow in a vertical sinter fixed bed is numerically studied using this method.The multi-sphere clumped method is used to create irregular sinter particles in DEM.The immersed boundary method and dynamic cell refinement are applied to describe the fluid flow around particles with higher resolution,by which the fluid-particle interaction can be simulated more accurately.The simulation results presented the packing voidage distributions and the airflow fields in the sinter beds of different single and mixed particle size ranges.The bed pressure drops were simulated and the results were compared with the corresponding experimental ones.The good agreement indicated that the proposed resolved CFD-DEM method is an effective tool to model the fluid-particle interaction for irregular large granules in the gas-solid multi-phase systems.
文摘Landscape process and pattern are closely related, hence recognition of landscape pattern is very important to recognize landscape process, and vice versa. Two new methods have been introduced: variable clumping method (VCM) and variable core area method (VCAM) which may be used to analyze spatial structure of landscape. VCM is used to quantify patch distribution while VCAM is for quantifying patch shape. To evaluate these methods, two different landscapes in southwestern Japan were applied. Saijo is selected as agricultural landscape and Hiwa is selected for region of mountainous rural landscape. By applying the two methods, several landscape elements showed that spatial structures depend on spatial scales. It can be concluded that the two tested methods are effective in understanding the characteristics of landscape structure which are difficult to detect by traditional analytic methods.
