Numerical Model of Supersaturated Total Dissolved Gas Dissipation in a Channel with Vegetation
Abstract
:1. Introduction
2. Materials and Methods
2.1. Study Case
2.2. Model Assumption
2.3. Model Equations
2.3.1. Continuity Equation
2.3.2. Momentum Equation
2.3.3. k-ε Equations
2.3.4. Transportation Equation of TDG
2.4. Compute Region and Meshes
2.5. Boundary Conditions
2.5.1. Boundary Conditions of Flow Field
2.5.2. Boundary Conditions of the TDG Concentration Field
2.6. Model Parameters
2.6.1. Parameterizing the TDG Source Term
2.6.2. The Formula of Inner Dissipation Coefficient
2.7. Verification of the Model
2.7.1. Verification Case
2.7.2. Verification Results of the Flow Field
2.7.3. Verification Results of the TDG Concentration Field
3. Results and Discussions
3.1. The Distribution of Supersaturated TDG around a Column
3.2. Vertical Distribution of Supersaturated TDG
3.3. Planar Distribution of Supersaturated TDG
3.3.1. The Longitudinal Distribution of Supersaturated TDG
3.3.2. The Lateral Distribution of Supersaturated TDG
4. Conclusions and Prospect
- (1)
- A three-dimensional two-phase flow dynamics model was established to study the complex characteristics of three-dimensional flow under the effects of vegetation, and the model was verified by measurements of flow velocity in vegetation-affected flows in the experiments. The verification results indicated that the numerical simulation results of each section were basically consistent with the measured flow velocity distribution, and the calculation error of flow velocity was within 0.019 m·s−1.
- (2)
- Dividing the dissipation process of supersaturated TDG in vegetation-affected flows into the liquid-gas free surface transfer and the inner dissipation, a three-dimensional supersaturated TDG transportation and dissipation model considering the influence of vegetation was established. In this model, the inner dissipation coefficient was introduced to characterize the inner dissipation of supersaturated TDG. A formula based on the average velocity, the average hydrodynamic radius, Reynolds number and vegetation density was developed to predict the inner dissipation coefficient of supersaturated TDG. The prediction model was verified with two individual cases, and this verification demonstrated that the simulation results of the dissipation process of supersaturated TDG in the flume were very close to the measured values. The transportation and dissipation model of supersaturated TDG established in this paper can be used to predict the transportation and dissipation process of supersaturated TDG dissipation in vegetation-affected flows.
- (3)
- The simulation results show that the water-blocking effect caused by a column formed an obvious area of low TDG saturation behind the column. In the vertical direction, the TDG saturation in the surface water was slightly lower than that in the subsurface water, and TDG saturation in the subsurface water decreased as the water depth increased. At the same time, affected by the water-blocking effect of the vegetation group, TDG saturation presented a distribution characterized by high values in the middle and low values on both sides in the lateral direction. In the longitudinal direction, the TDG saturation decreased gradually with downstream extent but showed serrated distribution characteristics in the region behind the column.
- (4)
- Because the existing measurement and numerical simulation methods have difficulty reflecting the influence of real vegetation on the flow field and the supersaturated TDG transportation and dissipation process, a Plexiglas vertical column with a square cross section was selected to simulate rigid hydrophilic plants. The effects of vegetation’s flexible characteristics and the presence of leaves on the transportation and dissipation processes of supersaturated TDG in flowing water remain to be studied. Limited by laboratory conditions, only small-scale mechanism experiments have been carried out. The parameters used in the three-dimensional TDG transportation and dissipation model were also calibrated by the experimental results. The applicability of this model for simulating the transportation and dissipation process of supersaturated TDG under vegetation-affected flows in large-scale flows remains to be further studied.
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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Case No. | Flow (L·s−1) | The Vegetation Density | Lateral Space Ly (10−2 m) | Longitudinal Space Lx (10−2 m) | The Flow Depth h (10−2 m) | TDG Saturation of Entry Section (%) |
---|---|---|---|---|---|---|
1 | 1.5 | 0 | / | / | 2.2 | 144.5 |
2 | 3.5 | 0 | / | / | 3.8 | 144.4 |
3 | 5.5 | 0 | / | / | 4.7 | 145.6 |
4 | 7.5 | 0 | / | / | 5.6 | 147.1 |
5 | 9.5 | 0 | / | / | 6.6 | 148.1 |
6 | 1.5 | 0.1 | 12.5 | 60 | 2.5 | 144.2 |
7 | 3.5 | 0.1 | 12.5 | 60 | 4.4 | 144.6 |
8 | 5.5 | 0.1 | 12.5 | 60 | 5.3 | 144.5 |
9 | 7.5 | 0.1 | 12.5 | 60 | 6.4 | 146.6 |
10 | 9.5 | 0.1 | 12.5 | 60 | 7.5 | 147.9 |
11 | 1.5 | 0.2 | 7.1 | 60 | 2.8 | 144.9 |
12 | 3.5 | 0.2 | 7.1 | 60 | 4.6 | 147.4 |
13 | 5.5 | 0.2 | 7.1 | 60 | 5.8 | 148.5 |
14 | 7.5 | 0.2 | 7.1 | 60 | 7.2 | 148.6 |
15 | 9.5 | 0.2 | 7.1 | 60 | 8.6 | 149.0 |
16 | 1.5 | 0.3 | 12.5 | 20 | 3.1 | 145.3 |
17 | 3.5 | 0.3 | 12.5 | 20 | 4.7 | 145.9 |
18 | 5.5 | 0.3 | 12.5 | 20 | 6.6 | 147.5 |
19 | 7.5 | 0.3 | 12.5 | 20 | 7.8 | 147.8 |
20 | 9.5 | 0.3 | 12.5 | 20 | 9.0 | 148.6 |
21 | 1.5 | 0.6 | 7.1 | 20 | 3.2 | 145.7 |
22 | 3.5 | 0.6 | 7.1 | 20 | 5.9 | 147.5 |
23 | 5.5 | 0.6 | 7.1 | 20 | 7.6 | 148.5 |
24 | 7.5 | 0.6 | 7.1 | 20 | 8.4 | 149.3 |
25 | 9.5 | 0.6 | 7.1 | 20 | 9.6 | 149.7 |
Case No. | Flow Rate (L·s−1) | Vegetation Density | TDG Saturation Upstream (%) | TDG Saturation Downstream (%) | kin (s−1) |
---|---|---|---|---|---|
1 | 1.5 | 0 | 144.5 | 137.2 | 4.5 × 10−5 |
2 | 3.5 | 0 | 144.4 | 138.9 | 5.5 × 10−5 |
3 | 5.5 | 0 | 145.6 | 140.2 | 6.0 × 10−5 |
4 | 7.5 | 0 | 147.1 | 142.0 | 6.5 × 10−5 |
5 | 9.5 | 0 | 148.1 | 143.9 | 7.8 × 10−5 |
6 | 1.5 | 0.1 | 144.2 | 135.2 | 4.3 × 10−5 |
7 | 3.5 | 0.1 | 144.6 | 137.8 | 5.2 × 10−5 |
8 | 5.5 | 0.1 | 144.5 | 138.3 | 5.8 × 10−5 |
9 | 7.5 | 0.1 | 146.6 | 141.1 | 6.3 × 10−5 |
10 | 9.5 | 0.1 | 147.9 | 143.5 | 7.5 × 10−5 |
11 | 1.5 | 0.2 | 144.9 | 133.5 | 4.0 × 10−5 |
12 | 3.5 | 0.2 | 147.4 | 139.2 | 5.0 × 10−5 |
13 | 5.5 | 0.2 | 148.5 | 141.5 | 5.5 × 10−5 |
14 | 7.5 | 0.2 | 148.6 | 142.6 | 6.0 × 10−5 |
15 | 9.5 | 0.2 | 149.0 | 144.1 | 7.2 × 10−5 |
16 | 1.5 | 0.3 | 145.3 | 131.3 | 3.7 × 10−5 |
17 | 3.5 | 0.3 | 145.9 | 135.9 | 4.7 × 10−5 |
18 | 5.5 | 0.3 | 147.5 | 139.0 | 5.2 × 10−5 |
19 | 7.5 | 0.3 | 147.8 | 140.8 | 5.8 × 10−5 |
20 | 9.5 | 0.3 | 148.6 | 143.0 | 7.0 × 10−5 |
21 | 1.5 | 0.6 | 145.7 | 128.2 | 3.0 × 10−5 |
22 | 3.5 | 0.6 | 147.5 | 134.2 | 4.1 × 10−5 |
23 | 5.5 | 0.6 | 148.5 | 138.0 | 4.5 × 10−5 |
24 | 7.5 | 0.6 | 149.3 | 140.2 | 5.0 × 10−5 |
25 | 9.5 | 0.6 | 149.7 | 142.7 | 6.3 × 10−5 |
Case No. | Flow (L·s−1) | Vegetation Density | kin Calculated (s−1) | kin Calibrated (s−1) |
---|---|---|---|---|
5 | 9.5 | 0 | 8.1 × 10−5 | 8.0 × 10−5 |
10 | 9.5 | 0.1 | 7.7 × 10−5 | 7.5 × 10−5 |
15 | 95 | 0.2 | 7.3 × 10−5 | 7.2 × 10−5 |
20 | 9.5 | 0.3 | 7.0 × 10−5 | 7.0 × 10−5 |
25 | 9.5 | 0.6 | 6.1 × 10−5 | 6.2 × 10−5 |
Case No. | Flow (m3·s−1) | The Water Depth of Inlet Section (10−2 m) | The TDG Saturation of Inlet Section (%) |
---|---|---|---|
15 | 0.0095 | 7.4 | 149.0 |
25 | 0.0095 | 8.4 | 149.7 |
Section No. | Mean Error (m/s) | RSD (%) | STD | RMSE (m/s) |
---|---|---|---|---|
Section 15-1 | 0.018 | 7.2 | 0.02 | 0.023 |
Section 15-2 | 0.019 | 6.5 | 0.02 | 0.009 |
Section 15-3 | 0.015 | 6.8 | 0.02 | 0.004 |
Section 15-4 | 0.008 | 3.3 | 0.01 | 0.006 |
Section 15-5 | 0.013 | 6.4 | 0.02 | 0.008 |
Section 25-1 | 0.017 | 8.6 | 0.02 | 0.019 |
Section 25-2 | 0.010 | 4.7 | 0.01 | 0.007 |
Section 25-3 | 0.012 | 6.8 | 0.01 | 0.004 |
Section 25-4 | 0.011 | 5.5 | 0.01 | 0.008 |
Section 25-5 | 0.011 | 6.4 | 0.01 | 0.002 |
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Yuan, Y.; Huang, Y.; Feng, J.; Li, R.; An, R.; Huang, J. Numerical Model of Supersaturated Total Dissolved Gas Dissipation in a Channel with Vegetation. Water 2018, 10, 1769. https://doi.org/10.3390/w10121769
Yuan Y, Huang Y, Feng J, Li R, An R, Huang J. Numerical Model of Supersaturated Total Dissolved Gas Dissipation in a Channel with Vegetation. Water. 2018; 10(12):1769. https://doi.org/10.3390/w10121769
Chicago/Turabian StyleYuan, Youquan, Yinghan Huang, Jingjie Feng, Ran Li, Ruidong An, and Juping Huang. 2018. "Numerical Model of Supersaturated Total Dissolved Gas Dissipation in a Channel with Vegetation" Water 10, no. 12: 1769. https://doi.org/10.3390/w10121769
APA StyleYuan, Y., Huang, Y., Feng, J., Li, R., An, R., & Huang, J. (2018). Numerical Model of Supersaturated Total Dissolved Gas Dissipation in a Channel with Vegetation. Water, 10(12), 1769. https://doi.org/10.3390/w10121769