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Two Porous Media Regions In A Channel Flow

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Applications

  • Fluid transport in industrial processes
  • Filtering process

Capabilities covered in this demonstration

  • Porous Media Modeling
  • SST URANS

Description & Performance Data

A SST URANS Simulation of incompressible, isothermal air boundary layer flow over a rough wall passing through two porous media regions. This study is used to validate the porous media model in EXN/Aero.

Mesh Topology:

Multi-block hybrid

Data Type:

Hybrid

No. Control Volumes:

69,330 thousand

Precision:

Mixed (double in porous media region)

GPU Type:

Nvidia K80 

No. GPU Devices:

GPU memory usage:

<25% 

CPU Type:

Intel Xeon

No. CPU Devices:

1

Notes

A uniform velocity of 1.0 m/s and a uniform temperature of 300K is applied at the inlet. The initial velocity and temperature in the domain is likewise set to 1.0 m/s and 300K, respectively. The wall temperature at the floor of the channel is set to 1000K. The porous media regions are modelled by adding a momentum source and an energy source term to the momentum and energy equation, respectively. Both regions in this example are treated as an homegeneous porous media. This reduces the input parameters for the momentum source to a scalar for the permeability and the inertial resistance factor. The inertial resistance factor is set to zero whereas the permeability is chosen to obtain a pressure drop of roughly 10 Pascal over the porous media regions. The volumetric heat capacity of the structured porous media is smaller than that of the fluid, causing an increase of energy in the fluid fraction due to the heated bottom wall. On the contrary, the volumetric heat capacity of the unstructured porous media is greater than that of the fluid. The fluid energy close to the wall only increases slightly since the majority of the energy flux is absorbed by the solid fraction of the porous media. The same can be stated for the energy advected into the porous media region.

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

porousMediaChannel.cgns
Solver_Control.xml
Variables.xml
Database.xml
BC_Families.xml
Cell_Families.xml
cvc.log

Tutorial

Tutorial sessions can be found at: http://envenio.ca/wiki/

Results

The pressure drop over the porous media regions is shown as well as the energy and temperature field.

Keywords

  • SST
  • Porous Media

Attachments (4)

Download all attachments as: .zip

 
2017-10-4

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