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Dual Impeller Baffled Mixer

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Applications

  • Industrial mixer
  • Chemical industry

Capabilities covered in this demonstration

  • Rotating frame-of-reference
  • Immersed boundary baffles

Description & Performance Data

  • An LES simulation of incompressible, isothermal flow in a dual impeller baffled mixing vessel.

Mesh Topology:

Multi-Block structured

Data Type:

Structured

No. Control Volumes:

9 million

Precision:

Double in all mesh regions

GPU Type:

Nvidia K80 

No. GPU Devices:

GPU memory usage:

 

CPU Type:

Intel i7-4930K

No. CPU Devices:

4

Notes

In this model, a baffled industrial mixing vessel is simulated using Large Eddy Simulation (LES) at a Reynolds number of 10,000. The geometry here is a mockup-up of a lab scale industrial mixer. The whole system is in a rotating frame-of-reference, and the walls of the mixer have a counterclockwise rotating velocity. The baffles are approximated using rotating immersed boundaries and are therefore not physically present in the mesh. In order to properly setup the rotating baffles, the axis of rotation has to be along the x-axis as shown in the figure below. The parameters of the rotating baffle module should be self explanatory except for the top and bottom position of the baffle which are identified in the figure below.

Since immersed boundary techniques rely on CVs to mimmic physical boundaries, it is important to lay a good mesh topology for the baffle regions. In the figure below, the topology used in the present demo case is shown. The baffle region is identified in purple, and the immersed baffles are identified in red. As the simulation progresses, the immersed baffles move with the wall at the same rotating velocity.

EXN/View: Mesh, Physics and Solver Settings

This is a navigable instance of the actual EXN/Aero user interface, showing the mesh at right and the solver control tree at left. Expand nodes in the tree to see an how we set up the physics models and solver parameters. The demonstration case shown here can be reconstructed on any terminal where EXN/Aero is installed, using the files found below.

Data Files

DualImpellerMixerSTR.cgns
Monitor.xml
Cell_Families.xml
Overset.xml
Options.xml
Database.xml
Variables.xml
Tooltips.xml
BC_Families.xml
Solver_Control.xml
cvc.log
Info.txt

Tutorial

Tutorial sessions can be found at: www.envenio.com/wiki

Results

Velocity Field and Pressure Field. The baffles are identified in black in the figures below.

Power Number Results

Keywords

  • Industrial mixer
  • Rotating frame-of-reference
  • Large Eddy Simulation
  • WALE Model
  • [1] Jonathan Robichaud, Large Eddy Simulation of Dual Impeller Baffled Mixer, Master thesis, University of New Brunswick, 2017, p. 104

Attachments (10)

Download all attachments as: .zip

2017-10-4

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