The effect of numerical diffusion on simulation of isolated bubbles in a gas–solid fluidized bed

Guenther, Chris; Syamlal, Madhava

doi:10.1016/s0032-5910(00)00386-7

Cited by 94 publications

(74 citation statements)

References 23 publications

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“…The bubble shape observed in an experiment, with operating conditions similar to that of the simulation, is shown in Figure 12. An MFIX input file predicting bubble formation can be found in Appendix F. Details about this second order discretization approach can be found in Syamlal (1997) and Guenther and Syamlal (2000). Figure 11.…”

Section: Simulation Resultsmentioning

confidence: 99%

Final Report for CRADA No. 97-F001

2000

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Section: Simulation Resultsmentioning

confidence: 99%

Final Report for CRADA No. 97-F001

2000

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“…MFIX is a FORTRAN 90 general purpose code (Boyle et al, 1998;Syamlal, 1998;Guenther and Syamlal, 2001), assembled in the Los Alamos National Laboratory from the K-FIX (Kachina with Fully Implicit eXchange) code . MFIX has been updated into the Geophysical version GMFIX to deal with typical geophysical applications, maintaining all the previous capabilities and adding new ones, such as the work associated with volumetric variations of the gas phase, the standard atmospheric profiles, the LES and RANS turbulence models, and the subgrid turbulent heat flux (Dartevelle, 2004;Dartevelle et al, 2004).…”

Section: S Lepore and C Scarpati: A New Analysis Of Pyroclastic Denmentioning

confidence: 99%

New developments in the analysis of column-collapse pyroclastic density currents through numerical simulations of multiphase flows

Lepore

Scarpati

2012

Solid Earth

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Abstract.A granular multiphase model has been used to evaluate the action of differently sized particles on the dynamics of fountains and associated pyroclastic density currents. The model takes into account the overall disequilibrium conditions between a gas phase and several solid phases, each characterized by its own physical properties. The dynamics of the granular flows (fountains and pyroclastic density currents) has been simulated by adopting a Reynolds-averaged Navier-Stokes model for describing the turbulence effects. Numerical simulations have been carried out by using different values for the eruptive column temperature at the vent, solid particle frictional concentration, turbulent kinetic energy, and dissipation. The results obtained provide evidence of the multiphase nature of the model and describe several disequilibrium effects. The low concentration (≤5 × 10 −4 ) zones lie in the upper part of the granular flow, above the fountain, and above the tail and body of pyroclastic density current as thermal plumes. The high concentration zones, on the contrary, lie in the fountain and at the base of the current. Hence, pyroclastic density currents are assimilated to granular flows constituted by a low concentration suspension flowing above a high concentration basal layer (boundary layer), from the proximal regions to the distal ones. Interactions among the solid particles in the boundary layer of the granular flow are controlled by collisions between particles, whereas the dispersal of particles in the suspension is determined by the dragging of the gas phase. The simulations describe well the dynamics of a tractive boundary layer leading to the formation of stratified facies during Strombolian to Plinian eruptions.

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“…As done to the continuity equation, Eq. [Patankar, 1980;Syamlal, 1998;Guenther and Syamlal, 2001;Dartevelle, 2006a,b]. Finally, the compact form of the scalar equation: …”

Section: Figurementioning

confidence: 99%

“…The convection terms from FOU are implicit in the coefficients (a) P and (a) nb . The additional source term, S DCM , is given by [Guenther and Syamlal, 2001 …”

Section: Discretized Scalar Equation With Deferred Correctionsmentioning

confidence: 99%

From model conception to verification and validation, a global approach to multiphase Navier-Stoke models with an emphasis on volcanic explosive phenomenology

Dartevelle¹

2007

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The effect of numerical diffusion on simulation of isolated bubbles in a gas–solid fluidized bed

Cited by 94 publications

References 23 publications

Final Report for CRADA No. 97-F001

Final Report for CRADA No. 97-F001

New developments in the analysis of column-collapse pyroclastic density currents through numerical simulations of multiphase flows

From model conception to verification and validation, a global approach to multiphase Navier-Stoke models with an emphasis on volcanic explosive phenomenology

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