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Figure 1 shows the mesh that was generated in Gambit. Right hand side of the figure shows the mesh near the wall. There are more refine meshes near the wall in order to be able to solve the viscous sublayer. Also note that in general, there is no discontinuity or sudden jump in mesh size throughout the model to prevent error in simulation. The mesh is also more refine at the lower part of the flocculator. This is where the turning occurs. Since this will be the region where most fluiditic activity take place, a finer mesh is employed in this region.
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