Two phase flow simulation in Fluent -- velocity problem

Make sure to check all of these factors to determine the cause of the issue.In summary, the individual is facing a problem with simulating two-phase flow in CFD Fluent, specifically with the movement of solids. Despite trying multiple k-e models, the solids are not behaving as expected in the simulation, with their assumed velocity of 12m/s resulting in a distance of only 0.5m being covered in 3.5 seconds. This is in contrast to the first phase (air) which travels the entire model in just 0.5 seconds with a velocity of 14m/s. Possible reasons for this issue could be an inappropriate turbulence model, incorrect boundary conditions, or inaccurate fluid properties or modeling of the solids. Further investigation is
  • #1
andyraq
1
0
Hi.

I'm trying to simulate two phase flow (gas - solids) in unsteady state in CFD Fluent. After testing many k-e models I'm achieving the same problem - solids have their assumed velocity (12m/s) but after 3,5seconds of real time they pass a distance of 0,5 meters... whereas the first phase (air) with velocity 14m/s need only 0,5 second of real time to pass the whole model. Problem is represented in the picture below. Any ideas what could be the reason of this problem?

http://images.tinypic.pl/i/00803/fkzxkha6fet9.jpg
 
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  • #2
It could be that your turbulence model is not appropriate for two-phase flow. You may need to use a different turbulence model to better capture the effects of the interphase interaction in your simulation. It is also possible that your boundary conditions are inappropriate. Make sure that the velocity and pressure boundaries are set correctly according to your system. Finally, it could be the case that the fluid properties you are using are not accurate enough or that the solids are not being modeled correctly.
 

What is two phase flow simulation?

Two phase flow simulation is a computational process that models the behavior of two different fluids (such as gas and liquid) as they interact with each other. It is commonly used in industries such as oil and gas, chemical engineering, and environmental studies to predict the behavior of fluids in various systems.

What is Fluent?

Fluent is a commercial computational fluid dynamics (CFD) software developed by ANSYS that is commonly used for simulating and analyzing fluid flow. It offers a wide range of capabilities for modeling complex fluid problems, including two phase flow simulations.

What is the velocity problem in two phase flow simulation?

The velocity problem in two phase flow simulation refers to the difficulty in accurately predicting the velocity distribution of both phases in a system. This is because the two phases may have different velocities, and they can also interact with each other in complex ways. It is a challenging aspect of two phase flow simulation that requires careful modeling and numerical techniques.

How is the velocity problem addressed in Fluent?

In Fluent, the velocity problem is addressed through the use of advanced numerical methods such as the Volume of Fluid (VOF) and Eulerian-Eulerian models. These methods allow for the accurate tracking of the interface between the two phases, as well as the calculation of their respective velocities. Additionally, Fluent offers a variety of post-processing tools for visualizing and analyzing the velocity distribution in a two phase flow simulation.

What are some common applications of two phase flow simulation in Fluent?

Two phase flow simulation in Fluent has a wide range of applications, including modeling multiphase flows in pipelines, mixing tanks, heat exchangers, and spray processes. It is also commonly used in the design and optimization of various industrial processes and equipment, as well as in research and development for new technologies.

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