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Experimental and numerical analyses of airflow around two cylinders angled to the direction of wind

Padewska-Jurczak Agnieszka, Szczepaniak Piotr, Walentyński Ryszard

Bulletin of the Polish Academy of Sciences. Technical Sciences

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2023

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Vol. 71, nr 1

art. no. e144578

EN

The analyses aim to determine aerodynamic force coefficients in the case of airflow around two smooth or rough cylinders positioned at different angles to the direction of wind velocity. Such systems, for instance, may be part of a tubular water slide. The results were compared with the values of the interference coefficient of the cylinders arranged in a row included in Eurocode EN 1991 part 4. The aerodynamic forces of the cylinder systems were determined on the basis of experimental tests conducted in a wind tunnel. To verify the above results, CFD (computational fluid dynamics) simulations were prepared. An important observation is that for the angle of yaw β = 0◦, the negative component of the lift force (lateral) fy is shown, while for the other cases, the situation is opposite and the lateral force points outside the gap (upward). The second is that the results of aerodynamic drag for rough cylinders arranged in a row and calculated according to EN 1991 part 4 may be underestimated. The flow around the pair of smooth cylinders is quite different from that of the rough ones, because during the experiment the first falls into the critical flow regime, while the second has supercritical characteristics.

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Porównanie sił aerodynamicznych działających na połowę torusa i dwa walce o tej samej długości

Padewska A., Szczepaniak P., Wawrzynek A.

Modelowanie Inżynierskie

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2016

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T. 29, nr 60

52--57

PL

W Eurokodzie PN-EN 1991-1-4 [11] brakuje wytycznych projektowych umożliwiających oszacowanie sił aerodynamicznych działających na obiekty o nietypowym kształcie. W referacie porównano zatem charakter przepływu powietrza o dużych, coraz częściej występujących na świecie prędkościach w pobliżu obiektów w kształcie połowy torusa (np. fragmentu zjeżdżalni wodnej) i dwóch walców o sumarycznej długości równej długości osi połowy torusa, ustawionych poziomo oraz odchylonych od poziomej płaszczyzny pod kątem ß = 45°. Porównano również siły aerodynamiczne działające na połowę torusa - opór aerodynamiczny i poziomą siłę prostopadłą do niego, z siłami działającymi na walce. Wyniki otrzymano na podstawie analiz numerycznych: MES i MOS, wykorzystując moduły: CFD (Computational Fluid Dynamics) i FSI (Fluid-Structure Interaction).

EN

Eurocode EN 1991-1-4 [11] does not include issues concerning wind loads acting on constructions in a non-typical shape. Therefore, in the paper the character of high-speed air flow, which increasingly occurs in the world around objects in the shape of a half - torus (eg. a fragment of a water slide) and two cylinders positioned horizontally and inclined to the horizontal plane at an angle ß = 45° were compared. Also aerodynamic forces acting on a half of the torus - an aerodynamic resistance and a horizontal force perpendicular to the direction of a wind velocity, were compared with forces acting on cylinders. Results are based on numerical analysis: FEM and FVM using the following modules: CFD (Computational Fluid Dynamics) and FSI (Fluid-Structure Interaction).

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Analysis of fluid-structure interaction of a torus subjected to wind loads

Padewska A., Szczepaniak P., Wawrzynek A.

Computer Assisted Methods in Engineering and Science

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2014

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Vol. 21, no. 2

151--167

EN

In the paper the aerodynamic forces acting on a part of a water slide or other object with curved, tubular shape, depending on the section of a torus and value of the wind velocity, were obtained. This was done by means of finite element method (FEM) and finite volume method (FVM) computer simulations, using modules: computational fluid dynamics (CFD) and fluid-structure interaction (FSI) and taking into account the Eurocode EN 1991-1-4.

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Pomiary toru i prędkości zjazdu w basenowych zjeżdżalniach wodnych

Jura Z., Szczepaniak P., Walentyński R.

Aparatura Badawcza i Dydaktyczna

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2011

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T. 16, nr 3

79-86

PL

Artykuł skrótowo przedstawia sposób pomiaru toru i prędkości zjazdu basenową zjeżdżalnią wodną. Badania te zostały wykonane w celu kalibracji i walidacji numerycznego modelu ruchu, wykorzystywanego do oceny bezpieczeństwa zjeżdżalni. W niniejszej pracy została opisana unikalna aparatura badawcza oraz procedura i wyniki przeprowadzonych pomiarów.

EN

The article is a brief description of measurements of rides inside a water slide, performed for the purpose of calibration and validation of a numerical model of motion. It presents the unique instruments together with the procedure and results of measurements.

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Numerical simulation of rapidly varied water flow in the "Wild River" type water slide

Burzyński K., Szydłowski M.

Archives of Hydro-Engineering and Environmental Mechanics

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2003

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Vol. 50, nr 1

37-57

EN

The numerical analysis of the water flow along the 'Wild River' type water slide is presented. As the mathematical model of the free surface flow shallow water equations are assumed. In order to solve the equations, when transient, rapidly varied flow is present, the numerical scheme based on finite volume method is applied. The numerical simulation of water slide flow is computed on unstructured, triangular mesh. The results of calculation are examined against flow parameters observed on the real object installed in water park in Sopot. Generally good agreement between measured and calculated results was observed. Moreover, the calculations are compared to experimental data available due to physical modelling. As the similarity between physical phenomena of flow within water slide and in the river valley after dam-break event is observed, the investigation was realized within the framework of the State Committee for Scientific Research 6P06S04121 project.