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CFD-DEM Simulation of Fluidized Bed, ANSYS Fluent & Rocky Coupling

  • Upon ordering this product, you will be provided with a geometry file, a mesh file, and an in-depth Training Video that offers a step-by-step training on the simulation process.
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Original price was: €210.00.Current price is: €155.00.

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Description

Many industries use fluidized bed dryers to dry particulates efficiently and uniformly. However, their complex hydrodynamics, which involve gas and solid phases, make prediction and optimization difficult. This research uses CFD and DEM to capture gas-particle dynamics in the dryer. ANSYS Rocky models granular dynamics, including particle-particle and particle-wall interactions, while ANSYS Fluent simulates gas phase fluid flow, heat transfer, and chemical reactions. Its seamless integration aims to explain the complicated interaction of forces driving particle motion, bed expansion, and heat transmission in the fluidized bed dryer, providing insights for improving dryer performance and efficiency in industrial applications.

The study presents the CFD-DEM modelling approach for fluidized bed and uses ANSYS Fluent and Rocky coupling to analyze complex multiphase flow phenomena. Many references, such as “CFD-DEM simulation of drying of food grains with particle shrinkage [1]” are used as references.

  • Reference [1]: Azmir, Jannatul, Qinfu Hou, and Aibing Yu. “CFD-DEM simulation of drying of food grains with particle shrinkage.” Powder Technology343 (2019): 792-802.
  • Reference [2]: He, Yi, Andrew E. Bayly, and Ali Hassanpour. “Coupling CFD-DEM with dynamic meshing: A new approach for fluid-structure interaction in particle-fluid flows.” Powder Technology325 (2018): 620-631.

Figure 1: A typical bubble, in which particles are colored by the magnitude of velocity; (b) snapshot of the vertical velocity of particles in the bubbling fluidized bed [2]

 

Simulation Process

The cylindrical domain is modeled and meshed in the primary phase using ICEM software. So a fine structured grid is produced. In order to accurately model the drying of grains, as mentioned above, the Discrete Element Method (DEM) must be utilized. Although ANSYS Fluent has weaknesses in modeling DEM, coupling with ANSYS Rocky results in a powerful tool. Now, not only are interactions between continuous and discrete phases included, but the interactions between the particles are also involved. It is what is called a 4-way DPM, however, using ANSYS Rocky makes it realistic.

Post-processing

When we look at the particle behavior in our fluidized bed, it’s like watching a carefully choreographed dance! The rotational velocity contours show particles spinning at speeds ranging from nearly stationary (0.27 rad/s) up to an impressive 546.7 rad/s. What’s particularly interesting is how these velocities aren’t randomly distributed – we can see clear patterns forming, especially near the walls where particle-wall interactions create distinct movement zones. The blue regions in the lower portion indicate more stable particle movement, while the greener and yellower areas higher up show where particles are really getting energetic!

Figure 2: Rotational velocity of particles in CFD-DEM Simulation of Fluidized Bed, ANSYS Fluent & Rocky Coupling

The temperature distribution tells an equally compelling story, ranging from 300.08K to 301.57K. While this might seem like a narrow range, it’s exactly what we want to see in a well-functioning fluidized bed. The animation reveals how particles are constantly mixing and exchanging heat, creating those beautiful bubble-like structures we see in fluidized beds. These bubbles, visible in both velocity and temperature contours, are crucial for efficient particle mixing and heat transfer – they’re essentially the ‘engines’ driving our whole process. The coupling between ANSYS Fluent and Rocky has really captured these complex particle-fluid interactions beautifully, showing us exactly how the bed expands and contracts during operation.

Figure 3: Temperature of particles in CFD-DEM Simulation of Fluidized Bed, ANSYS Fluent & Rocky Coupling


The animation extracted from the transient (unsteady) CFD simulation is shown below:

FAQ

We pride ourselves on presenting unique products at CFDLAND. We stand out for our scientific rigor and validity. Our products are not based on guesswork or theoretical assumptions like many others. Instead, most of our products are validated using experimental or numerical data from valued scientific journals. Even if direct validation isn’t possible, we build our models and assumptions on the latest research, typically using reference articles to approximate reality.

Yes, we’ll be here . If you have trouble loading files, having technical problems, or have any questions about how to use our products, our technical support team is here to help.

You can load geometry and mesh files, as well as case and data files, using any version of ANSYS Fluent.

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Original price was: €210.00.Current price is: €155.00.