Characterization of Energy Dissipation Region
Figure 1. Contour of Energy Dissipation Rate (h/b=3)
Figure 1 shows the visually the distribution of the energy dissipation rate. A less subtle way of characterize the uniformity of the energy dissipation rate is to use UDF to analyze the distribution of the energy dissipation rate.
Figure 2. Distribution of Energy Dissipation Rate (h/b=3) with "hump"
By plotting the distribution according to the range of energy dissipation rate shown in figure 1, we are able to better characterize the distribution of the energy dissipation rate in figure 2. It is interesting to see that there is a hump. The peak of the hump is around energy dissipation rate of 0.006 m2/s3.
Smaller range of energy dissipation rate was set to investigate this region.
Figure 3. Contour of Energy Dissipation Rate (h/b=3) with Tighter Range
From figure 3, setting a tighter range of energy dissipation rate, we see that the contour is dominated by the blue and green region which is from the range of 0.005 to 0.01 m2/s3. This explains the hump in the appearance of hump in figure 2.
Figure 4. Distribution of Energy Dissipation Rate (h/b=4) with "hump"
Figure 4 shows the distribution of energy dissipation rate for flocculation tank height of 4b. We also see a visible hump.
Figure 5. Contour of Energy Dissipation Rate (h/b=4)
From figure 5, we see that the contour is dominated by blue and green region ranges from 0.002 to 0.006 which further explain the visibility of hump. With two example, we have verifed that the hump is a good parameter is analyzing uniformity of the energy dissipation rate, we can use this characteristic in determining energy dissipation rate for different geometry.