Flow in a gas burner (BMBF project with Vaillant/Remscheid)

Boussinesq flow in a gas burner at medium Reynolds number. See also the results for the other flow situations. A complete description of this flow type which has been part of a BMBF project (with Vaillant at Remscheid/Germany) can be found at (see the paper archive):

http://www.featflow.de/ture/paper/raschrtu.ps.gz

The flow simulations have been performed - for comparison reasons - with and without coupling of the temperature to figure out the influence of the heated bottom (flame!). The result is that at least for this kind of geometrical model the configuration is mainly determined by the flow, and not by the (additional) heat sources. Additionally, the geometrical model does not seem to be optimal as can be seen from the inhomogeneous outflow through the bottom where the flame is located in a real configuration. However, one has to keep in mind that this simulation was performed without additional turbulence model.

• Distribution of temperature/concentration via Boussinesq model
  
  

  Visualization via tracking of concentration, starting from the inlet (first, 5.1 MB), and via showing the temperature distribution from the heated lower side. The movies in the second and third row are created with different color maps. While the left versions correspond to the full Boussinesq model including temperature coupling in the momentum equation, the right movies are done without (second row: 1.6 MB; third row: 2.1 MB). As can be seen, the differences are negligible which shows that this simulation is determined by the hydrodynamics only!
  

  
  

  
  

  
  
  

• Pressure
  
  

  Visualization via pressure plots, shaded (first, 1.9 MB) and via isolines (second, 5.6 MB).
  

  
  
  

• Streamfunction
  
  

  Visualization via streamline plots, shaded (first, 2.0 MB) and via isolines (second, 5.1 MB).
  

  
  
  

• Velocity
  
  

  Visualization via normalized vector plots (first, 3.6 MB, the norm of the velocity vectors is adressed by the color) and via "real size" vectors (second, 8.3 MB).