Channel flow with two opposite symmetric bumps at low Reynolds number (same heigth)

Channel flow with two narrowing sections at low Reynolds number, starting from rest. Both bumps are symmetric and opposite, and their height is 0.35, while the free section inbetween has width 0.3. The flow gets immediately steady.

• Distribution of temperature/concentration via Boussinesq model
  
  

  Visualization via distribution of given concentration in the flow field, starting from the inlet (shaded, 1.0 MB).
  

  
  
  
  
  

• Pressure
  
  

  Visualization via pressure plots, shaded (first, 0.7 MB) and via isolines (second, 0.4 MB).
  

  
  
  
  
  
  
  

• Streamfunction
  
  

  Visualization via streamline plots, shaded (first, 1.1 MB) and via isolines (second, 0.8 MB).
  

  
  
  
  
  
  
  

• Velocity
  
  

  Visualization via vector plots (1.0 MB).