References of "Samiei, Kasra 40000592"
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See detailNumerical prediction of the bulk density of granular particles of di erent geometries
Peters, Bernhard UL; Samiei, Kasra UL; Berhe, Girma UL

in KONA Powder and Particle Journal (2013)

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See detailExperimental and numerical investigation into the residence time distribution of granular particles on forward and reverse acting grate
Samiei, Kasra UL; Peters, Bernhard UL

in Chemical Engineering Science (2013)

Forward andreverseactinggratesarewidelyemployedinwaste-to-energyplants.Inordertopredict the motionofsolidgranularparticlesandoptimisethedesignofsuchsystems,DiscreteElement Method(DEM)isincreasinglyused ... [more ▼]

Forward andreverseactinggratesarewidelyemployedinwaste-to-energyplants.Inordertopredict the motionofsolidgranularparticlesandoptimisethedesignofsuchsystems,DiscreteElement Method(DEM)isincreasinglyused.Theobjectiveofthispaperistopredictthedynamicsofgranular particlesonforwardandreverseactinggratesbyapplyingDEM.Theresidencetimedistributionofsolid particlesisanalysedbyDEMandcomparedwithexperimentalresultsinapilotplantexcluding combustion.TheresultsindicateaverygoodconsistencybetweenDEMandexperimentalresults, highlightingthepromisingcapabilitiesofDEMinpredictingthedynamicsofgranularparticlesingrate systems.CouplingDEMwithcomputationalfluiddynamicstechniquescanfurtheradvancethemethod to accountforthermalconversionofsolidfuelsinfuturework. [less ▲]

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See detailAssessment of the potentials of implicit integration method in discrete element modelling of granular matter
Samiei, Kasra UL; Peters, Bernhard UL; Bolten, Matthias et al

in Computers & Chemical Engineering (2013)

Discrete element method (DEM) is increasingly used to simulate the motion of granular matter in engineering devices. DEM relies on numerical integration to compute the positions and velocities of ... [more ▼]

Discrete element method (DEM) is increasingly used to simulate the motion of granular matter in engineering devices. DEM relies on numerical integration to compute the positions and velocities of particles in the next time step. Typically, explicit integration methods are utilized in DEM. This paper presents a systematic assessment of the potentials of implicit integration in DEM. The results show that though the implicit integration enables larger time steps to be used compared to the common explicit methods, the overall speed up is overruled by higher computational costs of the implicit method. [less ▲]

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See detailAssessment of implicit and explicit algorithms in numerical simulation of granular matter
Samiei, Kasra UL

Doctoral thesis (2012)

The objectives of this dissertation are to investigate and demonstrate the potentials of implicit integration methods in predicting the dynamics of granular media and to describe the granular dynamics on ... [more ▼]

The objectives of this dissertation are to investigate and demonstrate the potentials of implicit integration methods in predicting the dynamics of granular media and to describe the granular dynamics on forward and backward acting grates by discrete element method. Traditionally, explicit integration methods are employed within the context of Discrete Element Method. Generally, explicit equations are simpler to solve than the implicit ones but they require a small time step to be utilized. In this study, an implicit Numerov integration scheme is employed to integrate the equations of motion. The implicit method is verified in different test cases starting from simple cases to more complicated cases including hundreds of particles. Comparing the results with the results of the explicit method, it is shown that the implicit method exhibits a distinguished advantage only at very large time steps. Taking into account the overhead of solving non-linear equations at each time step, it is concluded that implicit methods are computationally too expensive for their limited gains. Addressing the second objective of this study, the residence time distribution of granular particles on forward and backward acting grates are numerically predicted. Very good agreement between the predictions and the available experimental results is achieved. It can be concluded that the Discrete Element Method is highly capable of predicting the dynamics of solid fuel particles on grate systems. Future work shall include coupling of the method with computational fluid dynamics in order to account for thermal conversion of the fuel particles. [less ▲]

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See detailAn implicit approach to predict the dynamics of granular media
Samiei, Kasra UL; Peters, Bernhard UL; Bolten, M. et al

in Abstract book of 81st Annual Meeting of the International Association of Applied Mathematics and Mechanics (2010), 10(1), 55-56

Detailed reference viewed: 35 (3 UL)