wiki:EXNAeroDemoCases/aircraftcabinventilation

Aircraft Cabin Ventilation: Experimental Mock-Up

Applications

  • Heating and Ventilation

Capabilities covered in this demonstration

  • Unsteady Reynolds Averaged Navier Stokes (URANS)
  • Buoyant Flow
  • Turbulence

Description & Performance Data

A URANS simulation of buoyant internal flow. The geometry was developed as an experimental mock-up of aircraft cabin ventilation. It includes an inlet diffuser near the ceiling (1.2 m/s, 22.2C), an outlet along the floor and a heated box (surface temperature of 36.7C) in the middle of the computational model that represents the blockage and heat addition of passenger seating and passengers. The buoyant forces have a strong effect on the air currents and temperature distributions within the model. A course mesh was chosen to provide quick turn around for new users. Larger meshes are available for more accurate URANS and LES simulations.

Mesh Topology:

Multi-block structured

Data Type:

Structured

No. Control Volumes:

64 000

Precision:

Single in all mesh regions

GPU Type:

Nvidia K20

No. GPU Devices:

1

GPU memory usage:

2.5

CPU Type:

Intel Xeon

No. CPU Devices:

1

Notes

The animation shows the large scale unsteadiness of the flow which arises from buoyant forces. The simulation used the SST turbulence model and solutions were performed using the unsteady mode. The time average velocity and temperature fields show the thermal plume rising from the heated box in the middle of the computational domain, pushing the inlet flow toward the ceiling. As a result the cool air provided at the inlet travels down the walls towards the base of the heated box and the outlet.

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

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

Tutorial

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

Results

Time averaged velocity and temperature on streamwise midplane(left) and crossstream midplane(right).

Keywords

  • URANS
  • THERMAL BUOYANCY
  • UNSTEADY
  • INTERNAL FLOW
  • HEATING AND VENTILATION

Wang, M. and Chen, Q., Assessment of Various Turbulence Models for Transitional Flows in Enclosed Environment, HVAC$R Research, Vol. 15, No. 6, 2009.

Last modified 3 months ago Last modified on Jul 19, 2017 9:32:15 AM

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