E X A M P L E S . O F . R E C E N T . R E S E A R C H

Fast Fluid Dynamics

Velocity distribution in a three-dimensional cavity with an object in the middle on the bottom wall
Research Assistant: Wei Liu

This study develops a Fast Fluid Dynamics (FFD) model that can be used to preidict airflow in a building with a speed faster than real time. For the forced convection shown in the figure, the computing speed is about 20-30 times faster than real time on a PC. This research will continue for a few years in order to improve the accuracy, stability, and applicability of the FFD for flow and contaminant distributions and energy prediction in various built environment. At present, a simple turbulence model with coarse grid is implemented into the FFD code. The FFD code is also being used for inverse design of built environment.

One can test this program by downloading it
"forcedconvection.exe" together with a graphics library "glut32.dll". Use your right mouse key and "Save Target As ..." in the same directory. For clarity, not all the grids are shown in the graphics. The actual grid number used in the program is 300 x 125.

To run "forcedconvection.exe" = double click the program
To change between "Velocity vector" and "Concentration" windows = press "v" key
To add smoke in "Concentration" window = press and hold right mouse key in desired position
To add force in the flow field = press and hold left mouse key in desired position
To make the velocity lines longer = press "l" key
To make the velocity lines shorter = press "k" key
To save the result = press "s" key
To start calculating the averaged value = press "m" key
To quit = press "q" key

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