Computational Mechanics Research and Support for Aerodynamics ...
Computational Mechanics Research and Support for Aerodynamics ... Computational Mechanics Research and Support for Aerodynamics ...
Table 2.3: Flow conditions Water Depth 3 inch 6 inch 9 inch Bed elevation 0 0 0 Air depth(inch) 2.5 3 2.5 Mean velocity (m/s) 0.2164 0.2164 0.2164 Tilting angle of the flume (degree) Tilting angle of the flap gate with respect to the horizontal (degree) 1 0.125 0.07 12.5 18 28 2.3.6. Results Using VOF Multiphase Model Velocity distributions are plotted over a plane cut through a culvert barrel trough that is located in the middle of the culvert. For each water depth, the velocity distribution across the whole multi-phase cross-section is given on the left, and the plot on the right covers only the lower zone containing water. Also, the 0.5 VOF curves are plotted on top of the velocity contours, which indicate the corresponding water surface. The results for 3 inch, 6 inch, and 9 inch water depth are illustrated in Figure 2.21, Figure 2.22, and Figure 2.23 respectively. Figure 2.21: Velocity distribution across trough section of the multi-phase model for 3 inch water depth TRACC/TFHRC Y1Q3 Page 32
Figure 2.22: Velocity distribution across trough section of the multi-phase model for 6 inch water depth Figure 2.23: Velocity distribution across trough section of the multi-phase model for 9 inch water depth 2.3.7. Comparison with the Single Phase Model In the multi-phase CFD model for the full-scale flume, if the longitudinal VOF changes indicate that the water level is nearly flat along the culvert, it is possible to set up a single phase model to simulate the flow. Figure 2.24 illustrates the comparison of the velocity distribution between the multi-phase model and full scale single phase model for 6 inch water depth. Note that the maximum velocity occurred in the single phase case is 0.42 m/s, which is larger than 0.38m/s in the multi-phase case. TRACC/TFHRC Y1Q3 Page 33
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Table 2.3: Flow conditions<br />
Water Depth 3 inch 6 inch 9 inch<br />
Bed elevation 0 0 0<br />
Air depth(inch) 2.5 3 2.5<br />
Mean velocity (m/s) 0.2164 0.2164 0.2164<br />
Tilting angle of the flume<br />
(degree)<br />
Tilting angle of the flap gate<br />
with respect to the horizontal<br />
(degree)<br />
1 0.125 0.07<br />
12.5 18 28<br />
2.3.6. Results Using VOF Multiphase Model<br />
Velocity distributions are plotted over a plane cut through a culvert barrel trough that is located in the<br />
middle of the culvert. For each water depth, the velocity distribution across the whole multi-phase<br />
cross-section is given on the left, <strong>and</strong> the plot on the right covers only the lower zone containing water.<br />
Also, the 0.5 VOF curves are plotted on top of the velocity contours, which indicate the corresponding<br />
water surface. The results <strong>for</strong> 3 inch, 6 inch, <strong>and</strong> 9 inch water depth are illustrated in Figure 2.21, Figure<br />
2.22, <strong>and</strong> Figure 2.23 respectively.<br />
Figure 2.21: Velocity distribution across trough section of the multi-phase model <strong>for</strong> 3 inch water depth<br />
TRACC/TFHRC Y1Q3 Page 32
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