Computational Mechanics Research and Support for Aerodynamics ...
Computational Mechanics Research and Support for Aerodynamics ... Computational Mechanics Research and Support for Aerodynamics ...
Figure 2.17: Velocity profiles of the different mesh cases with base size 5 mm plotted using at a trough In Figure 2.17, velocity profiles for the different mesh cases with base size 5 mm at a trough are plotted. The 5 mm base size with a 66.6% refinement in the trough appears to be the coarsest mesh that is mesh independent. TRACC/TFHRC Y1Q3 Page 28
Mesh 1 Mesh 2 Mesh 3 Mesh 4 Mesh 5 Mesh 6 Figure 2.18: Velocity plots of the various mesh cases in the mesh refinement study The above Figure 2.18 contains the velocity distribution scenes of all the various mesh cases used for the mesh refinement study plotted at a crest. Mesh Refinement Conclusions: The mesh refinement studies have been conducted for various base sizes of the mesh for the symmetric reduced barrel section (considered from a trough to a trough) to choose the optimum base size of the mesh and also the refinement that needs to be done in the corrugated section. By analyzing the variation of the surface averaged velocity with respect to the length of the plane section at a trough and the velocity profiles plotted using line probes at a trough and a crest the optimum mesh can be selected. With all the CFD analysis done on a 36 inch diameter of the culvert with corrugation size 3 inches by 1, for a flow depth of 9 inches and a flow velocity of 0.71 feet/second for zero bed elevation of the culvert, in terms of mesh refinement studies, mesh 5 with a 5 mm base size and 67% refinement in the corrugation region, which yields a mesh with about 250,000 cells gives mesh independent simulation results with adequately fast run times. TRACC/TFHRC Y1Q3 Page 29
- Page 1 and 2: ANL/ESD/11-39 Computational Mechani
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- 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: In Figure 2.15 the velocity and the
- Page 35 and 36: Figure 2.20: Dimensional details of
- 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
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- Page 79 and 80: Figure 3.32 Comparison of the initi
Mesh 1 Mesh 2 Mesh 3<br />
Mesh 4 Mesh 5 Mesh 6<br />
Figure 2.18: Velocity plots of the various mesh cases in the mesh refinement study<br />
The above Figure 2.18 contains the velocity distribution scenes of all the various mesh cases used <strong>for</strong> the<br />
mesh refinement study plotted at a crest.<br />
Mesh Refinement Conclusions: The mesh refinement studies have been conducted <strong>for</strong> various base<br />
sizes of the mesh <strong>for</strong> the symmetric reduced barrel section (considered from a trough to a trough) to<br />
choose the optimum base size of the mesh <strong>and</strong> also the refinement that needs to be done in the<br />
corrugated section. By analyzing the variation of the surface averaged velocity with respect to the length<br />
of the plane section at a trough <strong>and</strong> the velocity profiles plotted using line probes at a trough <strong>and</strong> a crest<br />
the optimum mesh can be selected. With all the CFD analysis done on a 36 inch diameter of the culvert<br />
with corrugation size 3 inches by 1, <strong>for</strong> a flow depth of 9 inches <strong>and</strong> a flow velocity of 0.71 feet/second<br />
<strong>for</strong> zero bed elevation of the culvert, in terms of mesh refinement studies, mesh 5 with a 5 mm base size<br />
<strong>and</strong> 67% refinement in the corrugation region, which yields a mesh with about 250,000 cells gives mesh<br />
independent simulation results with adequately fast run times.<br />
TRACC/TFHRC Y1Q3 Page 29
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