1. Waller Creek 8th Street Side Weir CFD Modeling and Simulation
Preliminary Results
Scenarios 2 and 4
August 18, 2009
ALDEN Research Laboratory Inc.
30 Shrewsbury St., Holden, MA 01520

2. CFD Model Geometry

3. CFD Model Geometry
Downstream deflection vane
Upstream deflection vane

4. CFD Model Geometry
Upstream deflection vane

5. CFD Model Geometry
Downstream deflection vane

6. CFD Model Geometry
Inline Weir

7. CFD Model Geometry
72-inch Storm Drain
Vertical Shaft

8. CFD Simulation Results: Flow Scenario 2
Flow Conditions (Data):
Below Vane Overtop
U/S Lateral Weir: Q = 22 cfs; CWSE = ft.
72-inch Storm Drain: Q = cfs
Lateral Weir: Q = 1.98 cfs
D/S Lateral Weir Q = cfs; CWSE = ft.
Inline Weir: Q = cfs; CWSE = ft.
D/S Inline Weir Q = cfs; CWSE = ft.

9. Boundary Conditions Specified Water Surface Elevation, WSE =455.96 ft.
Specified Flow Rate, Q = 22 cfs
Specified Water Surface Elevation, WSE = ft.

10. Water Surface Elevation
Summary of Results: Flow Scenario 2
Flow Location
Volume Flow Rate
(cfs)
Water Surface Elevation
(ft)
Data
CFD
U/S Lateral Weir 22
457.48
72-inch Storm Drain -
Lateral Weir
1.98
1.8
D/S Lateral Weir
20.02
20.2
457.43
Inline Weir
457.40
D/S Inline Weir
455.96
457.00

11. Iso-surface plot of water colored with velocity magnitude
Plan view
(ft/s)
Inflow = 22 cfs
Predicted Flow
D/S Inline Weir = 20.2 cfs
Predicted Flow
Lateral Weir = 1.8 cfs

12. Iso-surface plot of water colored with velocity magnitude
Isometric view 1
(ft/s)

13. Iso-surface plot of water colored with velocity magnitude
Isometric view 2
(ft/s)

14. Iso-surface plot of water colored with velocity magnitude
(solid component is transparent to see the water surface)
* velocity magnitude color scale is the same in slides 11,12 and 13

15. Iso-surface plot of water colored with velocity magnitude
(solid component is not shown to see clearly the water surface)
* velocity magnitude color scale is the same in slides 11,12 and 13

16. Iso-surface plot of water colored with velocity magnitude
(solid component is transparent to see the water surface)
* velocity magnitude color scale is the same in slides 11,12 and 13

17. Iso-surface plot of water colored with velocity magnitude
(solid component is not shown to see clearly the water surface)
* velocity magnitude color scale is the same in slides 11,12 and 13

18. Iso-surface plot of water colored with velocity magnitude
(elevation view, looking downstream)
* velocity magnitude color scale is the same in slides 11,12 and 13
Curtain wall

19. Iso-surface plot of water colored with velocity magnitude
(elevation view, looking upstream)
* velocity magnitude color scale is the same in slides 11,12 and 13
Curtain wall

20. Iso-surface plot of water colored with free surface elevation
(Plan view)
(ft.)

21. Iso-surface plot of water colored with free surface elevation
(Plan view)
* same with slide 20 but different color scale
(ft.)

22. Iso-surface plot of water colored with free surface elevation
(showing water surface elevation downstream of inline weir)
(ft.)
Inline Weir

23. CFD Simulation Results: Flow Scenario 4
Flow Conditions (Data):
100-year
U/S Lateral Weir: Q = 920 cfs; CWSE = ft.
72-inch Storm Drain: Q = cfs
Lateral Weir: Q = 700 cfs
D/S Lateral Weir Q = 220 cfs; CWSE = ft.
Inline Weir: Q = 220 cfs; CWSE = ft.
D/S Inline Weir Q = 220 cfs; CWSE = ft.

24. Boundary Conditions Specified Water Surface Elevation, WSE =458.38 ft.
Shaft HGL = ft
Specified Flow Rate, Q = 920 cfs
Specified Water Surface Elevation, WSE = ft.

25. Water Surface Elevation
Summary of Results: Flow Scenario 4
Flow Location
Volume Flow Rate
(cfs)
Water Surface Elevation
(ft)
Data
CFD
U/S Lateral Weir
920
459.96
72-inch Storm Drain -
Lateral Weir
700
699
D/S Lateral Weir
220
221
459.08
458.90
Inline Weir
D/S Inline Weir
458.38

26. Iso-surface plot of water colored with velocity magnitude
Plan view
(ft/s)
Time Frame = 114 sec
Inflow = 920 cfs
Predicted Flow
D/S Inline Weir = 221 cfs
Predicted Flow
Lateral Weir = 699 cfs

27. Iso-surface plot of water colored with velocity magnitude
Isometric view 1
(ft/s)
Time Frame = 114 sec

28. Iso-surface plot of water colored with velocity magnitude
Isometric view 2
(ft/s)

29. Iso-surface plot of water colored with velocity magnitude
(solid component is transparent to see the water surface)
* velocity magnitude color scale is the same in slides 26, 27 and 28

30. Iso-surface plot of water colored with velocity magnitude
(solid component is not shown to see clearly the water surface)
* velocity magnitude color scale is the same in slides 26, 27 and 28

31. Iso-surface plot of water colored with velocity magnitude
(solid component is transparent to see the water surface)
* velocity magnitude color scale is the same in slides 26, 27 and 28

32. Iso-surface plot of water colored with velocity magnitude
(solid component is not shown to see clearly the water surface)
* velocity magnitude color scale is the same in slides 26, 27 and 28

33. Iso-surface plot of water colored with velocity magnitude
(elevation view, looking downstream)
* velocity magnitude color scale is the same in slides 26, 27 and 28
Curtain wall

34. Iso-surface plot of water colored with velocity magnitude
(elevation view, looking upstream)
* velocity magnitude color scale is the same in slides 26, 27 and 28
Curtain wall

35. Iso-surface plot of water colored with free surface elevation
(Plan view)
(ft.)

36. Iso-surface plot of water colored with free surface elevation
(showing water surface elevation downstream of inline weir)
(ft.)
Inline Weir
Water surface elevation, D/S Inline Weir = ft

37. Iso-surface plot of water colored with free surface elevation
(showing water surface elevation at the shaft)