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To extend the current 2D CFD models of flocculation tank in to 3D , will greatly enhance our understanding of the fluid dynamics inside the flocculation tank. In this report, four sets of preliminary 3D computational simulations were presented and discussed: first on investigating the difficulty of 3D models in converging to satisfactory residual; and then on comparing the validity of 2D and 3D models by running 3D simulations with the model on which 2D assumptions were imposed.
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