CFD Flocculation Tank Simulation Meeting Minutes

Fall 2008 Minutes

September 29, 2008

Accomplishments

• Examined the significance of differing values of Gtheta calculated using different methods. (see below)
• Created mesh with three turns to determine how separation region interacts with the subsequent flow around a baffle.
• Obtained converged solution with three turns at h=1.5 width, and 50,000 cells.

Metrics

G_ave*theta_ave=.617
  sum(theta_cell)=8217 sec (theta_ave=8217/30000 cells)
  Gave in cells=2.25
sum(G_cell*thetha_cell)=.6698

thetha_system=20 sec

G_thetha_max

Outcomes

• The thetha values in stagnant/recirculating regions are very large. Thus when examining the sum of the theta values, the value is significantly higher than the Vtot/Q. 
• Obtained Gtheta value is order 1, and we need to examine why this value is significantly smaller than expected.

Issues

• Gtheta values did not correspond with what was expected.
• Difficulty with meshing the boundary layer