Convection 1.0 for Mac can be downloaded from our website for free. This free Mac application is an intellectual property of Edward Chew. The application is included in Theming Tools.
From the developer:
This screen saver simulates the convection of free-flowing particles enclosed in a cube that is being heated from the bottom.
You may want to check out more Mac applications, such as Energy2D or Thermodynamics Calculator, which might be similar to Convection.