Numerical investigation on unsteady vortical flows with a grid-free Vortex method
Estadístiques de LA Referencia / Recolecta
Inclou dades d'ús des de 2022
Cita com:
hdl:2117/188806
Tipus de documentText en actes de congrés
Data publicació2013
EditorCIMNE
Condicions d'accésAccés obert
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Abstract
In this study, a grid-free vortex method was developed and applied to turbulent flows in order to validate the scheme. In order to satisfy the boundary condition for internal flow calculation, the direct boundary element method (BEM) was employed. The grid-free redistribution model proposed by Fukuda and Kamemoto [3] and vortex reconnection model was also introduced and the spatial resolution was improved for high strain regions. From the results, it was confirmed that the unsteady feature of the turbulent boundary layer in the turbulent internal flow and its development were successfully captured. Furthermore, comparisons of the calculated mean velocity and the calculated rms value of the axial velocity fluctuation in the turbulent internal flow with experimental data showed that the method provided an accurate velocity profile and axial velocity fluctuation in turbulent boundary layers. In the vortex rings interaction calculation, reconnection process was reasonably simulated and the spatial resolution was improved even in the high strain regions using the redistribution model and the reconnection model. The analysed energy spectra were in close agreement with the existing DNS and experimental data up to high wave number regions.
ISBN978-84-941531-8-1
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Particles 2013_ ... estigation on unsteady.pdf | 424,5Kb | Visualitza/Obre |