Two-dimensional simulation of flow around rectangular prisms

Yu, Dahai; Kareem, Ahsan

doi:10.1016/s0167-6105(96)00076-1

Cited by 28 publications

(11 citation statements)

References 26 publications

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“…However, it is not straightforward to distinguish between the effect of the blockage ratio and submergence ratio by considering this configuration, i.e., fixed bridge and variable water depth. As the submergence ratio increases, h* ≥ 3.5, the drag coefficient approaches the constant value of about 1.6, which is close to the experimental result of the drag coefficient for a rectangular cylinder in an unbounded flow (Yu and Kareem [16]).…”

Section: Effect Of Proximity Blockage and Inundation Ratios On Bridsupporting

confidence: 88%

“…configuration, i.e., fixed bridge and variable water depth. As the submergence ratio increases, h* ≥ 3.5, the drag coefficient approaches the constant value of about 1.6, which is close to the experimental result of the drag coefficient for a rectangular cylinder in an unbounded flow (Yu and Kareem [16]). When the deck Froude number is larger than 0.6, the maximum peak of CD occurs at an h* of around 2.…”

Section: Effect Of Proximity Blockage and Inundation Ratios On Bridsupporting

confidence: 88%

“…Due to the contraction of flow at the bridge deck, which causes maximum blockage near h* = 1, flow accelerates near the deck. Since Equation (5) cannot account for this acceleration, the drag coefficient varies with h*, but asymptotes to the canonical value for a square cylinder in an unbounded flow of CD = 1.6 at large h* [16].…”

Section: Validationmentioning

confidence: 96%

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Hydrodynamic and Debris-Damming Failure of Bridge Decks and Piers in Steady Flow

et al. 2018

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In countries with steep rivers, such as Japan and the United States, bridges fail on an annual basis. Bridges on spread footings are especially susceptible to failure by hydrodynamic loading, often exacerbated by debris damming. Here, such failures are investigated via small scale model laboratory experiments and full scale numerical simulations. In the laboratory, lift and drag forces and overturning moment on bridge decks, piers, and deck-pier systems, are measured and compared with threshold of failure criteria used in design guidelines. Effects of debris on lift, drag, and moment, as well as three-dimensional effects, are quantified. Via numerical simulations, flow patterns and free surface behaviour responsible for these forces are investigated, and described in a framework as a function of the water depth, flow speed, deck clearance, and girder height. Results show that current guidelines are non-conservative in some cases. Importantly, failure of both decks and piers can be prevented by strengthening pier-deck connections, or by streamlining decks.

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Section: Effect Of Proximity Blockage and Inundation Ratios On Bridsupporting

confidence: 88%

Section: Effect Of Proximity Blockage and Inundation Ratios On Bridsupporting

confidence: 88%

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Hydrodynamic and Debris-Damming Failure of Bridge Decks and Piers in Steady Flow

et al. 2018

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“…Over most of the roof surface area, the comparisons were good for normal wind conditions and the low building model. Yu and Kareem (1996) worked on twodimensional simulation of flow around rectangular prisms. Frank (1996) performed numerical calculation for the turbulent flow fields at high Reynolds numbers by means of the LES.…”

Section: K-ε Modelmentioning

confidence: 99%

Numerical prediction of wind loads on low buildings

Ahmad¹,

Muzzammil²,

Zaheer³

2011

Int. J. Eng. Sci. Tech

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In the present study, 2-D numerical simulation of wind loads on low-rise buildings has been carried out. The simulation was carried out under FLUENT package environment in which full-scale Reynolds number, boundary layer and turbulence properties have been simulated. Wind loading effect numerically obtained on flat roof (TTU building) and pitched roof is compared with wind tunnel data. It was found that there is fair agreement between the numerical predictions and measurements for time-averaged wind loads on buildings. The computed pressure coefficients have been validated with wind tunnel TTU building model results on 1:100 scale within an average error of 20%. The effect of roof pitch for 10°, 20° & 30° on pressure coefficients for gable roof has also been investigated and the results were compared with the available wind tunnel results for 15°, 26° & 35° roof pitch. The present study shows that the numerical simulation of wind loads hold a great potential for extending codes of practice for wind loads.

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“…Modern aerodynamics originating from Prandlt's boundary-layer theory acquired maturity over a long time by many theoretical [36][37][38][39], experimental [40][41][42][43][44][45] and numerical [46][47][48][49][50][51][52][53] studies. The detailed description of these works is beyond the scope of the project.…”

Section: Introductionmentioning

confidence: 99%

Efficient Simulation and Novel Modeling by Using Generic Three-Dimensional Exact Solutions to Analyze Transport Dynamics in Turbulent Vortices

Bhattacharya¹

2009

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REPORT DOCUMENTATION PAGEThe public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for _ , «.a,., y existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing the burden, to the Department of Defense, Executive Service Directorate (0704-0188). Respondents should be aware that notwithstanding any other provision of law, no person shall be subject to any penalty for failing to comply with a collection of information if it does not display a currently valid OMB control number. PLEASE DO NOT RETURN YOUR SPONSORING/MONITORING AGENCY NAME(S) AND ADDRESS(ES)AFOSR 875 N RANDOLPH ST ARLINGTON, VA 22203 Dr. John Schmisseur/NA SPONSOR/MONITOR'S ACRONYM(S) SPONSOR/MONITOR'S REPORT NUMBER(S) DISTRIBUTION/AVAILABILITY STATEMENTDistribution A -Approved for public release SUPPLEMENTARY NOTES ABSTRACTIn this project, we have formulated an alternative boundary-layer theory. This new analysis will be able to mathematically describe flow-separation unlike the classical theory. In our research, we have partially validated the developed theory and concluded that approach has considerable potential to account for flow-separation. The effective description of separated flow can potentially lead to a fast simulation-algorithm for aerodynamic computation. Our estimate predicts that this semianalytical scheme will compute the lift and drag on an aerodynamic body in less than O.lsec with less than l\% relative error. This is more than hundredfold increase over current simulation-efficiency. The enhanced efficiency will enable hitherto impossible exploration of new designs for maximization of the lift to drag ratio. In the future, this will revolutionize aviation technology by the development of bio-inspired aviation mechanism and other novel systems. Such improvements will help in energy-savings and pollution control by reducing fuel consumptions. SUBJECT TERMSAlternative boundary-layer theory, flow-separation, fast aerodynamic algorithm Flow-separation from a rigid body is an unsolved problem in theoretical fluid mechanics in spite of the maturity of this field. Classical boundary-layer theory cannot provide a complete description and quantitative estimates for such phenomenon. For example, it is not possible to determine the vortical structures in separated flows by using boundary-layer equation in the wake region [1][2][3][4][5][6][7]. Similarly, there is no easy way to predict the strength of the eddies without extensive computations [8,9]. Unfortunately, subsequent theoretical developments, like triple-deck theory [10][11][12][13] or other viscous-inviscid analysis [14-21] have not been able to overcome these deficiencies.The lack of mathematical understanding of flow-separation is a severe hindrance in aerodynamic analysis. In absence of an analytical method, the bru...

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Two-dimensional simulation of flow around rectangular prisms

Cited by 28 publications

References 26 publications

Hydrodynamic and Debris-Damming Failure of Bridge Decks and Piers in Steady Flow

Hydrodynamic and Debris-Damming Failure of Bridge Decks and Piers in Steady Flow

Numerical prediction of wind loads on low buildings

Efficient Simulation and Novel Modeling by Using Generic Three-Dimensional Exact Solutions to Analyze Transport Dynamics in Turbulent Vortices

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