Large eddy simulations of the turbulent flows of twin parallel jets
| Autor: | Thien Nguyen, Han Li, N. K. Anand, Yassin A. Hassan |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Fluid Flow and Transfer Processes
Physics Turbulence Mechanical Engineering Spectral density 02 engineering and technology Mechanics 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Plenum space 010305 fluids & plasmas Vortex Coolant Physics::Fluid Dynamics Particle image velocimetry 0103 physical sciences Heat transfer 0210 nano-technology Large eddy simulation |
| Zdroj: | International Journal of Heat and Mass Transfer. 129:1263-1273 |
| ISSN: | 0017-9310 |
| DOI: | 10.1016/j.ijheatmasstransfer.2018.10.069 |
| Popis: | Turbulent jet interactions play a significant role in terms of momentum and heat transfer. For example, in next generation nuclear reactors, high temperature flow mixing in the lower plenum and mixing fluctuations in the coolant may influence power oscillations. Thus, the estimation of the mixing condition needs to be accurate. Recent benchmark experiments using particle image velocimetry (PIV) technique provided high-fidelity experimental data that could be used in comparative studies. In the present study, large eddy simulation (LES) numerical methodology is used on a parallel jet system and validated with benchmark PIV experiments. The results indicate good agreement in terms of the merging point and time averaged velocity profile. Spectral analyses via Welch’s power spectral density functions are used to analyze frequency information in turbulence jets. The proper orthogonal decomposition (POD) analysis method is applied using a snapshot method. The POD analysis indicates vortex structures similar to those in the benchmark PIV experiment. |
| Databáze: | OpenAIRE |
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