Design, construction and performance of a large tornado simulator for wind engineering applications

Haan, Fred L.; Sarkar, Partha Pratim; Gallus, William A.

doi:10.1016/j.engstruct.2007.07.010

Cited by 203 publications

(110 citation statements)

References 22 publications

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“…Our experimental result agrees well with the Rankin vortex model except near the vortex centre. Hann et al also observed this flattened profile near the vortex centre [3]. They suggested that this is due to the downdraft near the vortex centre that was also observed in our PIV measurement.…”

Section: Flow Field Generated By the Tornado Simulatorsupporting

confidence: 60%

“…The horizontal axis indicates normalized distance from the vortex centre. Doppler radar data from full-scale tornados at Spencer, South Dakota and Mulhall, Oklahoma [3] are also plotted in the figure. The height of the horizontal plane of these full-scale tornado data is z = 0.52R, while ours is z = 0.54R.…”

Section: Methodsmentioning

confidence: 99%

“…The velocity vectors on the vertical plane indicate that the flow coming from the far field near the stage moves up while a weak downdraft appears in the centre area. This is flow structure is called a two-celled vortex [3]. By using the velocity field obtained by PIV, the maximum tangential velocity, Vmax, and the radius of vortex core, R, at which the tangential velocity becomes maximum were obtained in each case of the vane angle ( Table 1).…”

Section: Methodsmentioning

confidence: 99%

“…Recently, Hann et al have developed a tornado simulator. It generates tornado-like vortices to quantify aerodynamic forces on civil engineering structures [3].…”

Section: Introductionmentioning

confidence: 99%

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An experimental investigation of flow around a vehicle passing through a tornado

Suzuki

Obara

Okura

2016

EPJ Web of Conferences

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Abstract. Flow around a vehicle running through a tornado was investigated experimentally. A tornado simulator was developed to generate a tornado-like swirl flow. PIV study confirmed that the simulator generates two-celled vortices which are observed in the natural tornadoes. A moving test rig was developed to run a 1/40 scaled train-shaped model vehicle under the tornado simulator. The car contained pressure sensors, a data logger with an AD converter to measure unsteady surface pressures during its run through the swirling flow. Aerodynamic forces acting on the vehicle were estimated from the pressure data. The results show that the aerodynamic forces change its magnitude and direction depending on the position of the car in the swirling flow. The asymmetry of the forces about the vortex centre suggests the vehicle itself may deform the flow field.

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Section: Flow Field Generated By the Tornado Simulatorsupporting

confidence: 60%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

“…Recently, Hann et al have developed a tornado simulator. It generates tornado-like vortices to quantify aerodynamic forces on civil engineering structures [3].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

An experimental investigation of flow around a vehicle passing through a tornado

Suzuki

Obara

Okura

2016

EPJ Web of Conferences

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“…Our tornado simulator was designed on the basis of the one at Iowa State University (Haan et al, 2008). This simulator consisted of inner and outer ducts, a fan, guide vanes, and a stage (Fig.…”

Section: Tornado Simulatormentioning

confidence: 99%

Study of aerodynamic forces acting on a train using a tornado simulator

Suzuki

Okura

2016

Mechanical Engineering Letters

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A novel experiment was conducted to investigate the aerodynamic forces acting on a train traveling through a tornado, in which we developed a moving model rig with a tornado simulator. The flow field generated by the tornado simulator was validated by comparison with those of real tornadoes and the Rankine vortex model. Using this setup, we measured unsteady surface pressures on a model train as it passed through the vortex center. The side force, lift force, and yawing moment were estimated from the pressure data. The results were as follows: 1) the side force acting on the train changed its direction from negative to positive while passing through the tornado-like swirling flow; 2) the lift force increased as the train approached the flow and became maximum around the vortex center; 3) the yawing moment first decreased slightly and then reached its maximum around the vortex center. Asymmetric wave forms of the forces and moment at the center of the tornado simulator suggested that the train itself may have affected the vortex structure of the flow.

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Tornado Wind and Atmospheric Pressure Change Effects

2019

Wind Effects on Structures

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Design, construction and performance of a large tornado simulator for wind engineering applications

Cited by 203 publications

References 22 publications

An experimental investigation of flow around a vehicle passing through a tornado

An experimental investigation of flow around a vehicle passing through a tornado

Study of aerodynamic forces acting on a train using a tornado simulator

Tornado Wind and Atmospheric Pressure Change Effects

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