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| 1 | Investigation into improving the efficiency and accuracy of CFD/DEM simulations显示文摘The Euler-Lagrange approach combined with a discrete element method has frequently been applied to elucidate the hydrodynamic behavior of dense fluid-solid flows in fluidized beds.In this work,the efficiency and accuracy of this model are investigated.Parameter studies are performed;in these studies,the stiffness coefficient,the fluid time step and the processor number are varied under conditions with different numbers of particles and different particle diameters.The obtained results are compared with measurements to derive the optimum parameters for CFD/DEM simulations.The results suggest that the application of higher stiffness coefficients slightly improves the simulation accuracy.However,the average computing time increases exponentially.At larger fluid time steps,the results show that the average computation time is independent of the applied fluid time step whereas the simulation accuracy decreases greatly with increasing the fluid time step.The use of smaller time steps leads to negligible improvements in the simulation accuracy but results in an exponential rise in the average computing time.The parallelization accelerates the DEM simulations if the critical number for the domain decomposition is not reached.Above this number,the performance is no longer proportional to the number of processors.The critical number for the domain decomposition depends on the number of particles.An increase in solid contents results in a shift of the critical decomposition number to higher numbers of CPUs. | Falah Alobaid Nabil Baraki Bernd Epple | 2014 | Particuology2014，12，5： | 5 |
| 2 | Improvement,validation and application of CFD/DEM model to dense gas-solid flow in a fluidized bed显示文摘Dense gas-solid flow with solid volume fraction greater than 10%and at moderate Reynolds number is important in many industrial facilities such as fluidized beds.In this work,the Euler-Lagrange approach in combination with a deterministic collision model is applied to a laboratory-scale fluidized bed.The fluid-particle interaction is studied using a new procedure called the offset method,which results in several numbers of spatial displacements of the fluid grid.The proposed method is highly precise in determining porosity and momentum transfer,thus improving simulation accuracy.A validation study was carried out to assess the results using this in-house CFD/DEM code against 5-s operation of a Plexiglas spouted-fluidized bed,showing good qualitative correlation of solid distribution in the bed and acceptable quantitative agreement of pressure drops at different positions in the bed.In view of high computing cost,special emphasis is placed on effective program design,such as application of advanced detection algorithm for particle-particle/wall collisions,the multi-grid method and parallel calculation.In this context,the influence of increasing the processor number,up to 36,on calculation efficiency was investigated. | Falah Alobaid Bernd Epple | 2013 | Particuology2013，11，5： | 3 |
| 3 | Pull-out strength of the suprapedicle claw construct : a biomechanical study 显示文摘 | Alobaid A Arlet V Busato A | 2005 | Eur-Spine2005，14，8： | 1 |
| 4 | Granulosa cell tumour: a recur- rence 40 years after initial diagnosis 显示文摘 | East N Alobaid A Goffin F | 2005 | J Obstet Gynaecol Can2005，27，4： | 1 |
| 5 | Minimally invasive dynamic hip screw:prospective randomized trial of two techniques of insertion of a standard dynamic fixation device显示文摘 | Alobaid A Harvey EJ Elder GM | 2004 | Jorthop Trauma2004，18，： | 1 |
| 6 | Advancing vascular tissue engineering: the role of stem cell technology 显示文摘 | Sales KM Salacinski HJ Alobaid N | 2005 | Trends in Biotechnology2005，23，9： | 1 |
| 7 | Minimally in vasive dynamic hip screw:prospective randomized trial of two techniques of insertion of a standard dynamic fixation device显示文摘 | ALOBAID A HARVER E J ELDER G M | 2004 | J Orthop Trauma2004，18，4： | 1 |
| 8 | A comparative study of different dynamic process simulation codes for combined cycle power plants–Part B:Start-up procedure显示文摘 | Alobaid F Starkloff R Pfeiffer S | 2015 | Fuel2015，153，： | 1 |
| 9 | Prospective randomized trial of two techniques of insertion of a standard dynamic fixation device 显示文摘 | Alobaid A Harry E J Elder GM | 2004 | J Orthop Trauma2004，4，： | 1 |
| 10 | Advancing vascular tissue engineering: the role of stem cell technology显示文摘 | SALES K M SALACINSKI HJ ALOBAID N | 2005 | Trends Biotechnol2005，23，9： | 1 |
| 11 | Minimally invasive dynamic hip screw: prospective randomized trial of two techniques of insertion of a standard dynamic fixation device 显示文摘 | Alobaid A Harvey EJ Elder GM | 2004 | J Orthop Trauma2004，18，4： | 1 |
| 12 | Minimally dynamic hip screw:prospective randomized trial of two techniques of insertion of a standard dynamic fixation device显示文摘 | Alobaid A Harvey EJ Elder GM | 2004 | J Orthop Trauma2004，8，4： | 1 |
| 13 | Granulosa cell tu- mour: a recurrence 40 years after initial diagnosis 显示文摘 | East N Alobaid A Goffin F | 2005 | J Obstet Gynaecol Can2005，27，4： | 1 |
| 14 | Granulosa cell tumour:arecu rrence 40 years af t er initial diagnosis显示文摘 | East N Alobaid A Goffin F | | 0，，04： | 1 |
| 15 | Minimally invasive dynamie hip screw prospective randomized trial of two techniques of insertion of a standard dynamic fixation device显示文摘 | Alobaid A Harvey EJ Elder GM | 2004 | J Orthop Trauma2004，18，： | 1 |
| 16 | Minimally invasive dynamic hip screw:prospective randomized trial of two techniques of insertion of a standard dynamic fixation device显示文摘 | Alobaid A Harvey EJ Elder GM | 2004 | J Orthop Trauma2004，18，4： | 1 |
| 17 | Minimally invasive dynamic hip screw:prospective randomized trial of two tech-niques of insertion of a standard drnamic fixation device显示文摘 | Alobaid A Harvey EJ Elder GM | 2004 | J Orthop Trauma2004，18，4： | 1 |
| 18 | Minimally invasive dynamic hip screw prospective randomized trial of two techniques of insertion of a standard dynamic fixation device显示文摘 | Alobaid A Harvey EJ Elder GM | 2004 | J Orthop Trauma2004，18，： | 1 |
| 19 | Minimally invasive dynamic hip screw : prospective randomized trial of two techniques of insertion of a standard dynamic fixation device 显示文摘 | Alobaid A Harvey EJ Elder GM | 2004 | J Orthop Trauma2004，18，4： | 1 |
| 20 | Minimally invasive dynamic hip screw:prospective randomized trial of two techniques of insertion of a standard dynamic fixation device 显示文摘 | Alobaid A Harvey E J Elder GM | 2004 | J Orthop Trauma2004，4，： | 1 |
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