Learning Forum

[Janaina Oliveira]

CFD-DEM Coupling FAQs: The Dynamics of Fluid-Particle Simulations 

The coupled CFD-DEM approach is a promising alternative for modeling granular-fluid systems since it can capture the discrete nature of the particle phase while maintaining computational tractability. 

In this post you will learn more about the CFD-DEM coupling method, through the frequently asked questions below: 

 

• What is CFD-DEM coupling, and how does it work? 

CFD-DEM coupling refers to the integration of two distinct computational modeling methods: Computational Fluid Dynamics (CFD) and Discrete Element Method (DEM). It is used to simulate complex processes that involve both fluid flow and the motion of discrete particles, such as dust, sand, gravel, and others. 

CFD is used to model the behavior of fluids, like gases or liquids. It solves the governing equations for fluid flow, including the Navier-Stokes equations. CFD calculates properties like velocity, pressure, and temperature throughout the fluid domain. 

DEM, on the other hand, simulates the motion and interactions of individual particles. It considers the discrete nature of these particles and tracks their movement and collisions. 

The coupling of CFD and DEM involves transferring information between the two models. When particles interact with the fluid, they affect the flow, and conversely, the fluid exerts forces on the particles. The coupling framework calculates and handles these interactions as the simulation progresses. 

 

• What are the key applications of CFD-DEM coupling? 

In essence, CFD-DEM coupling allows you to simulate scenarios where the behavior of particles in a fluid, like sediment in a river or particles in a chemical reactor, has a significant impact on the overall system behavior. This method is widely used in various industries, including pharmaceuticals, chemical engineering, and the study of granular materials in geophysics. It provides a more accurate representation of the real-world behavior of these complex systems.  

  

• What are the advantages of using CFD-DEM in simulations? 

The CFD-DEM coupling simulation provides a powerful tool for simulating and optimizing systems where both fluid dynamics and particle interactions are integral to the outcome, leading to improved designs, cost savings, and a better understanding of these systems. 

 

• What software tools or platforms are commonly used for CFD-DEM simulations? 

Ansys has two excellent software for simulations using the CFD-DEM coupling method, Ansys Rocky which can be used alone and Ansys Fluent which can be used together with Ansys Rocky, adding several advantages and providing a comprehensive platform for simulating fluid-particle interactions. 

• Can CFD-DEM be used for both academic research and industrial applications? 

Yes, CFD-DEM can be used for both academic research and industrial applications.  

In Academic Research the method can be used for Fundamental Research since it allows researchers to explore fundamental phenomena related to particle-fluid interactions, multiphase flows, and granular materials.  Academics also can use CFD-DEM to develop and test new models, algorithms, and simulation techniques. This can lead to innovative approaches to understanding complex systems. 

On the other hand, in industry, CFD-DEM is applied to optimize various processes, such as pharmaceutical manufacturing, food processing, and chemical reactions. It can lead to cost savings, increased efficiency, and improved product quality. Engineers use CFD-DEM to design and analyze equipment like fluidized beds, mixers, and separators. It helps in developing systems that meet production requirements and safety standards. 

 

•  Where can I find resources or training to learn more about CFD-DEM coupling? 

You can find more learning material about the CFD-DEM coupling method on Ansys platforms, such as Ansys Website in the Webinars Page, the Ansys How-to You Tube Channel, Ansys Innovation Space courses, and Ansys Help. You can also ask questions about the CFD-DEM coupling method on the Learning Forum. 

 

Learn more about CFD-DEM Coupling in the links below:

Multiphysics Simulation with CFD-DEM [Webinar]

Ansys Rocky: DEM-CFD Coupling [Video]

Unlocking the Power of CFD-DEM Coupling: Modeling Fluid-particulate Systems

 

Ansys Rocky is the industry-leading discrete element method (DEM)

software used for simulating the motion of granular

and discontinuous material.  

Ansys Rocky: Exploring the Multiphysics Simulation Universe beyond DEM. 

Learn more about Rocky in the Ansys Rocky Community.

 

[Nilay Pedram]

Hello!
Thanks for this information. 

[Janaina Oliveira]

You're welcome Nilay!

[Benjamin Pommer]

 

Good Day together,

for a private project i want to check different geometry of an sandblasting gun.

This tool works with the bernoulli equation:

2 inlet –> high pressure air inlet and dust+air inlet

1 outlet

im a designer and not a simulation engineer, could anyone please help me to check if the flow is okay and the gun works?

 

THanks and BR,

BP

 

[Rob]

With some caveats regarding flow speeds, yes it will work. Assuming it's a commercial project please use "Contact Us" on ansys.com to discuss further. Whilst the solver technology for the Academic version is near enough identical to the Commercial code the software terms for Academic use are very different. Additionally, Commercial licences come with additional support options beyond what is offered on the public AIS forum. 

[Benjamin Pommer]

Thanks Rob for the answer, no it is`nt commercial, i just want to check my knowledge from air vents to integrate in this guns.

is there any tutorial or documents to get more informations? 

[Rob]

The coupling and Rocky courses are currently only available on the Ansys Learning Hub (subscription content) but I understand a public version will be added to the Learning (AIS, ie here) once it's ready: I don't have a date for that at present. 

[Benjamin Pommer]

Rob, im thankful for your support!

 

Cheers