Atmospheric dispersion modelling over complex terrain at small scale

Nosek, Štěpán; Jaňour, Zbyněk; Kukačka, Libor; Jurčáková, Klára; Kellnerová, Radka; Gulikova, Eva

doi:10.1051/epjconf/20146702084

Cited by 4 publications

(4 citation statements)

References 3 publications

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“…The structure of the wind field caused by the train is complex, and the turbulence problem is inevitable. There are many studies on the turbulent atmospheric boundary layer [17][18][19][20][21][22]. Large-scale detailed calculations of the flow field around trains require many computational resources.…”

Section: Wind Aerodynamic Forcesmentioning

confidence: 99%

Effect of Inter-Vehicle Suspension on Variable Speed Curve Running of Train under Crosswinds

Jia,

Jin,

Chen

et al. 2023

Applied Sciences

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High-speed trains operating in windy areas may accelerate and decelerate frequently to maintain safe travel, especially when passing curves. During acceleration and deceleration, the role of inter-vehicle suspension (IVS) cannot be ignored. The present study aims to evaluate the effect of IVS on the variable speed curve running of trains under crosswinds. To achieve this purpose, a multibody model of a China Railways High-speed 2 (CRH2) high-speed train considering the IVS is established. By inputting the crosswind loads and traction or braking forces to the model and setting curved tracks with different radii and the unloading factor set as safety criterion, the safe running speeds of the train under different crosswind speeds and different track radii were obtained. The difference in the vehicle dynamics considering the IVS and the fixed connection under traction and braking conditions is analyzed. The radius of the curve track significantly affects the safety characteristics of a train under crosswinds, but its impact diminishes for radii greater than 7000 m. The lateral acceleration, movement angle, unloading factor, and derailment coefficient in both acceleration and deceleration cases of car bodies are affected by the IVS. As a consequence, the IVS will lead to lower safe speeds than fixed connections, but it will also convey more realistic and credible train dynamics.

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Section: Wind Aerodynamic Forcesmentioning

confidence: 99%

Effect of Inter-Vehicle Suspension on Variable Speed Curve Running of Train under Crosswinds

Jia,

Jin,

Chen

et al. 2023

Applied Sciences

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“…Dispersion over an coal mine [4] and effects of wind fences porosity were studied in Czech Republic as well [5]. The safety of nuclear power plants against aircraft attack was studied e.g.…”

Section: Introductionmentioning

confidence: 99%

Gas dispersion modelling in a critical infrastructure area

2018

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Abstract. Experimental investigation of gas dispersion in a critical infrastructure area was performed using a boundary layer wind tunnel. The dispersion of gases is evaluated from the point of view on required function of security systems in case of critical infrastructure accident involving airplane attack. Physical model of the critical infrastructure installed in the wind tunnel is subjected to measurement of gas concentration with flame ionisation detectors.

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“…Britter and Hanna [4] reviewed flow and dispersion in different scales. In Czech Republic, Ulman et al [5,6] studied dispersion in topographically complicated terrain, Nosek et al [7], Janour et al [8], Brych et al [9] investigated gas dispersion from a chemical factory.…”

Section: Introductionmentioning

confidence: 99%

Wind tunnel studies of gas dispersion over complex terrain

Michálek

Zacho

2016

EPJ Web of Conferences

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Wind tunnel studies of gas dispersion over complex terrain model were performed in VZLU Prague. The terrain model with a ground-level emission source was mounted in a boundary layer wind tunnel. Flow and concentration field behind the source was measured. The model presented an area of the Liberec city, 9.0 × 2.4 km in full scale. The emission source was mounted at the position of a heating plant in the model centre and concentration field was measured using flame ionisation detectors. The experimental results will be used for validation and verification of a new computational dispersion model intended for use in case of accidents with dangerous gas leakages in selected areas in Czech Republic.

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Atmospheric dispersion modelling over complex terrain at small scale

Cited by 4 publications

References 3 publications

Effect of Inter-Vehicle Suspension on Variable Speed Curve Running of Train under Crosswinds

Effect of Inter-Vehicle Suspension on Variable Speed Curve Running of Train under Crosswinds

Gas dispersion modelling in a critical infrastructure area

Wind tunnel studies of gas dispersion over complex terrain

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