Computational Mechanics Research and Support for Aerodynamics ...
Computational Mechanics Research and Support for Aerodynamics ... Computational Mechanics Research and Support for Aerodynamics ...
2.3.4. Three Dimensional Model of Culvert Flume with Comparison to Experimental Results The preliminary objective of this study was to develop a computational fluid dynamics (CFD) model to characterize the three-dimentional (3-D) two-phase (air and water) laboratory model associated with three different water depths, two different velocities and three bed elevations. The suitability of the CFD model for fish passage engineering analysis is assessed by comparison with experimental data obtained from TFHRC. In phase 1 of the study, a three-dimentional multi-phase CAD model, as shown in Figure 2.19, was created in Pro-ENGINEER. The CAD model consists of three parts along the flow direction (z axis): the intake, the barrel and the diffuser. Since the two-phase VOF model (water and air) is used for numerical simulation, initially an air layer was included on top of the water domain in the vertical direction (x axis). The culvert model considered in phase 1 of study is the symmetrical half of the culvert pipe having annular corrugations without bed elevation as shown in Figure 2.19. Figure 2.19: Three-dimensional CAD model for multi-phase simulations The experiments in this study were conducted at the FHWA J.Sterling Jones Hydraulics Laboratory, located at the TFHRC. The experiments were conducted in a circulating flume. Figure 2.20 provides the details of the experimental flume dimensions in front and overlook views. The corrugations used are 3 inch by 1 inch annular. Three typical cross sections were monitored in the tests, which were located at the inlet of the barrel (section 1), the middle of the barrel (section 2) and the end of the barrel (section 3), respectively. TRACC/TFHRC Y1Q3 Page 30
Figure 2.20: Dimensional details of the flume (front and top views) The primary purpose of running CFD tests on a three dimensional model of the full TFHRC culvert test flume is to verify that the much smaller domain of a barrel section with cyclic boundary conditions can be used for parametric runs to determine zones for fish passage. A significant difference in the two models is that the small section using a cyclic boundary condition must be run as a single phase flow with a symmetric, free slip boundary condition at the water surface. This requires that the flow be deep enough for the corrugations to have negligible effect on the surface. Truncated CFD models with cyclic boundaries can be utilized as a time-effective tool in completing the large test matrix of the project. 2.3.5. Flow Conditions All the test scenarios in the study involve three different water depths, two velocities, and three bed elevations. Additional design parameters include tilting angle of the flume, open angle of the flap gate, roughness parameters etc.. The flow conditions for the completed multi-phase CFD model tests are listed in Table 2.3. TRACC/TFHRC Y1Q3 Page 31
- Page 1 and 2: ANL/ESD/11-39 Computational Mechani
- Page 3 and 4: ANL/ESD/11-39 Computational Mechani
- Page 5 and 6: Computational Mechanics Research an
- Page 7 and 8: 3.3.4. Simplifying Assumptions ....
- Page 9 and 10: Figure 2.22: Velocity distribution
- Page 11 and 12: List of Tables Table 2.1: Boundary
- Page 13 and 14: experiments at TFHRC continued. A m
- Page 15 and 16: 2. Computational Fluid Dynamics for
- Page 17 and 18: ( ) ( ) (2.8) where A 0, A 1, and n
- Page 19 and 20: efine the rate function to improve
- Page 21 and 22: The objective of this work is to de
- Page 23 and 24: 2.3.2. Mesh Refinement Study As det
- Page 25 and 26: Table 2.2: Details of the various m
- Page 27 and 28: indicating the surface averaged vel
- Page 29 and 30: Figure 2.13: Line probes created at
- Page 31 and 32: In Figure 2.15 the velocity and the
- Page 33: Mesh 1 Mesh 2 Mesh 3 Mesh 4 Mesh 5
- Page 37 and 38: Figure 2.22: Velocity distribution
- Page 39 and 40: Figure 2.25: CFD velocity contour p
- Page 41 and 42: Figure 2.27: CFD velocity contour p
- Page 43 and 44: Conclusions for Comparison with Exp
- Page 45 and 46: 3.1.1.1. Approach To date, an initi
- Page 47 and 48: Figure 3.4: Sampling domain [3] A c
- Page 49 and 50: present. In addition during the sum
- Page 51 and 52: For each level, the figures below s
- Page 53 and 54: 0.0 sec 0.5 sec 1.0 sec 1.5 sec 2.0
- Page 55 and 56: 0.5 sec 1.0 sec 1.5 sec 2.0 sec 3.0
- Page 57 and 58: 0.5 sec 1.0 sec 1.5 sec 2.0 sec 3.0
- Page 59 and 60: 3.2.1. Vehicle Stability under High
- Page 61 and 62: ̇ = steer angle These equations co
- Page 63 and 64: ̈ With the success to the above an
- Page 65 and 66: command. This requires the creation
- Page 67 and 68: Figure 3.17: FEM Model of a Ford F-
- Page 69 and 70: 3) Chen, F. and Chen, S., “Assess
- Page 71 and 72: 75 50 25 Force (N) 0 -25 -50 -75 -1
- Page 73 and 74: while the passive system has fixed
- Page 75 and 76: the controllable EMSA. Simulations
- Page 77 and 78: 4. Build a shell container with the
- Page 79 and 80: Figure 3.32 Comparison of the initi
2.3.4. Three Dimensional Model of Culvert Flume with Comparison to Experimental Results<br />
The preliminary objective of this study was to develop a computational fluid dynamics (CFD) model to<br />
characterize the three-dimentional (3-D) two-phase (air <strong>and</strong> water) laboratory model associated with<br />
three different water depths, two different velocities <strong>and</strong> three bed elevations. The suitability of the CFD<br />
model <strong>for</strong> fish passage engineering analysis is assessed by comparison with experimental data obtained<br />
from TFHRC. In phase 1 of the study, a three-dimentional multi-phase CAD model, as shown in Figure<br />
2.19, was created in Pro-ENGINEER. The CAD model consists of three parts along the flow direction (z<br />
axis): the intake, the barrel <strong>and</strong> the diffuser. Since the two-phase VOF model (water <strong>and</strong> air) is used <strong>for</strong><br />
numerical simulation, initially an air layer was included on top of the water domain in the vertical<br />
direction (x axis). The culvert model considered in phase 1 of study is the symmetrical half of the culvert<br />
pipe having annular corrugations without bed elevation as shown in Figure 2.19.<br />
Figure 2.19: Three-dimensional CAD model <strong>for</strong> multi-phase simulations<br />
The experiments in this study were conducted at the FHWA J.Sterling Jones Hydraulics Laboratory,<br />
located at the TFHRC. The experiments were conducted in a circulating flume. Figure 2.20 provides the<br />
details of the experimental flume dimensions in front <strong>and</strong> overlook views. The corrugations used are 3<br />
inch by 1 inch annular. Three typical cross sections were monitored in the tests, which were located at<br />
the inlet of the barrel (section 1), the middle of the barrel (section 2) <strong>and</strong> the end of the barrel (section<br />
3), respectively.<br />
TRACC/TFHRC Y1Q3 Page 30
Change language