In modeling flocculation tank, we want to model the tank in the way that accurately represent the physical properties. In order to achieve that, couple of validation process are used.
1. The modeling data should not deviate from the measureble experimental data (for instance, pressure coefficient drop)
2. Mesh sensitivity analysis was carried out to see that the modelings result does not deviate much from using different mesh density.
3. Effect of boundary layer is taken into account. We need to create a mesh near the wall such that the cell next to the wall need to be at the y+ of smaller than 5 so that we can resolve the viscous sublayer.
4. Appropriate turbulence model is chosen for accurately representing the flow properties in flocculation tank. (This is done by comparing the difference turbulence model with the experimental results that have the same flow properties in the 180 degree turn in flocculator. Flow over a backstep was modeled)
Step one to three above has been verified over Spring 2008. Step four was validated at the beginning of the semester.
Validation of Turbulence Models:
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