Spatio-temporal description of the cavitating flow behavior around NACA 2412 hydrofoil

Rudolf, Pavel; Štefan, David; Sedlář, Milan; Kozák, Jiří; Huzlik, Rostislav

doi:10.1088/1742-6596/656/1/012168

Cited by 3 publications

(1 citation statement)

References 5 publications

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“…The POD analysis of the HS video capturing cavitation cloud over NACA profile was done by Rudolf et al [11]. Influence of the aeration on the cavitation patterns downstream within the Venturi tube was the scope of investigation which has been done by Tomov et al [12].…”

Section: Proper Orthogonal Decomposition Of the High Speed Recordsmentioning

confidence: 99%

Transition of cavitating flow to supercavitation within Venturi nozzle – hysteresis investigation

et al. 2017

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Abstract. Cavitation is usually considered as undesirable phenomena. On the other hand, it can be utilized in many applications. One of the technical applications is using cavitation in water treatment, where hydrodynamic cavitation seems to be effective way how to reduce cyanobacteria within large bulks of water. The main scope of this paper is investigation of the cavitation within Venturi nozzle during the transition from fully developed cavitation to supercavitation regime and vice versa. Dynamics of cavitation was investigated using experimental data of pressure pulsations and analysis of high speed videos, where FFT of the pixel intensity and Proper Orthogonal Decomposition (POD) of the records were done to identify dominant frequencies connected with the presence of cavitation. The methodology of the high speed (HS) records semiautomated analysis using the FFT was described. Obtained results were correlated and above that the possible presence of hysteresis was discussed.

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Section: Proper Orthogonal Decomposition Of the High Speed Recordsmentioning

confidence: 99%

Transition of cavitating flow to supercavitation within Venturi nozzle – hysteresis investigation

et al. 2017

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Investigation of the Cavitation Within Venturi Tube: Influence of the Generated Vortex

et al. 2018

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FSI analysis of francis-99 hydrofoil employing SBES model to adequately predict vortex shedding

Čupr

Štefan

Rudolf

2019

J. Phys.: Conf. Ser.

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The added effects from the fluid on a structure submerged in water significantly affect its dynamic response. Since the hydraulic turbine runner is geometrically complex and involves complicated flow phenomena, the research on simple hydrofoil offers a unique opportunity to investigate added effects and mutual interaction of the elastic structure and vortical flow. For this purpose, the fluid structure interaction of Francis-99 hydrofoil was analysed using the Stress Blended Eddy Simulation (SBES). Advantage of this hybrid RANS-LES turbulence model over RANS models is shown by its enhanced ability to represent vortex shedding. The results of modal sensitivity analysis showed, that fillets of the fixed hydrofoil have negligible influence on the natural frequencies of the hydrofoil and therefore the simplified geometry was used. The modal analysis of fully fixed hydrofoil both in the air and submerged in water were carried out to investigate the added mass effect. Moreover, the hydrodynamic damping for various flow velocities was also investigated for the first bending mode. Overall results are complemented by sensitivity analysis of time step size and mesh for both structural and fluid domains. The results showed that the computed damping ratio above the lock-in and vortex shedding frequency at lock-in are largely underestimated. Therefore, the geometry with blunt trailing edge was additionally tested.

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Spatio-temporal description of the cavitating flow behavior around NACA 2412 hydrofoil

Cited by 3 publications

References 5 publications

Transition of cavitating flow to supercavitation within Venturi nozzle – hysteresis investigation

Transition of cavitating flow to supercavitation within Venturi nozzle – hysteresis investigation

Investigation of the Cavitation Within Venturi Tube: Influence of the Generated Vortex

FSI analysis of francis-99 hydrofoil employing SBES model to adequately predict vortex shedding

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