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CFD Lagrangian Multiphase Simulation Applied to Dust Explosion
Characterization
Authors: Daniel Vizcaya, Carlos Murillo, Nathalie Bardin-Monnier,
Olivier Dufaud, Laurent Perrin, Nicolás Ratkovich & Felipe Muñoz
• Drag Force• Material Particles• Pressure Gradient Force• Spherical Particles
• Injector:– Mass Flow Rate: 6 kg/s for t <
0.2 ms– Number of Parcels: 2.2e+06– Particle Size Distribution from
laser diffraction (Table 3)
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3. Simulation: Principal Models
Table 3. Particle Size Distribution from laser
diffraction
0
0.1
0.2
0.3
0.4
Mas
s Fr
acti
on
Particle Size (μm)
Particle Size Distribution
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3. Simulation: Initial Conditions
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4. Results: Influence of iterations
0.00
0.10
0.20
0.30
0.40
0.50
0.60
0.70
0.80
0.90
1.00
0 5 10 15 20
Pre
ssu
re (
bar
)
Time Step
Pressure profile
250 Iter
1000 Iter
Experimental results
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4. Results: Computational cost
0
50
100
150
200
0 5 10 15
Sim
ula
tio
n t
ime
(h
)
Time Step
Computational Cost
250 iter
1000 iter
• Windows Server 2008 – 64-bit
• Processor: Intel ® Xeon ® X5060 @ 2.67GHz
• RAM; 40 Gb
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4. Results: Particle flow
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4. Results: Particle flow
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4. Results: Particle diameter for 1000 iter
• STAR-CCM+® was used to developed a multiphase lagrangianflow in order to simulate the flammable dust dispersionwithin the 20 L sphere.
• The number of Maximum Inner Iterations has a significantimpact on the results as well as on the computational cost.
• The nozzle disperses correctly the dust within the domain.However, the smaller particles tends to the walls and thebigger ones to the center of the sphere.
• In order to model correctly the behavior of the flow, and dueto the geometry high complexity, it was necessary toimplement the DES turbulence model.
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5. Conclusions
• The Maximum Inner Iterations will be increased to 1500.
• The simulation time will be 120 ms in order to evaluate abetter ignition time for the standard test.
• The use of cohesion models to represent particlefragmentation and agglomeration will be added.
• Another types of nozzle will be simulated in order to evaluatethe dust homogeneity within the sphere.
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5. Future Work
CFD Lagrangian Multiphase Simulation Applied to Dust Explosion
Characterization
Authors: Daniel Vizcaya, Carlos Murillo, Nathalie Bardin-Monnier,
Olivier Dufaud, Laurent Perrin, Nicolás Ratkovich & Felipe Muñoz