Temporally developing DNS for channel flow at Reτ = 180 and 590 are performed to understand the turbulence generation mechanism for wall bound flow transition. Simulations for Reτ = 180 were performed for initial turbulence intensities TI = 0.1%, 1%, 2.5% and 5% and for Reτ = 590 with TI = 1% and 5%. The results in the fully developed turbulent region were compared with Moser et al. (1999) DNS data to validate the predictions. The near-wall vortical structures, mean and turbulent stresses and energy spectra, and turbulent kinetic energy (TKE) and stress budget in the pre-transition, transition and turbulent regions are analyzed to understand the turbulence onset, growth and decay mechanism. Finally, molecular diffusion and pressure strain time scales in the pre-transition to turbulent regions are analyzed to evaluate the turbulence onset criteria.
- Fluids Engineering Division
Analysis of Turbulence Generation and Energy Transfer Mechanisms in Boundary Layer Transition Using Direct Numerical Simulation
Bhushan, S, Borse, M, Walters, DK, & Pasiliao, CL. "Analysis of Turbulence Generation and Energy Transfer Mechanisms in Boundary Layer Transition Using Direct Numerical Simulation." Proceedings of the ASME 2016 Fluids Engineering Division Summer Meeting collocated with the ASME 2016 Heat Transfer Summer Conference and the ASME 2016 14th International Conference on Nanochannels, Microchannels, and Minichannels. Volume 1A, Symposia: Turbomachinery Flow Simulation and Optimization; Applications in CFD; Bio-Inspired and Bio-Medical Fluid Mechanics; CFD Verification and Validation; Development and Applications of Immersed Boundary Methods; DNS, LES and Hybrid RANS/LES Methods; Fluid Machinery; Fluid-Structure Interaction and Flow-Induced Noise in Industrial Applications; Flow Applications in Aerospace; Active Fluid Dynamics and Flow Control — Theory, Experiments and Implementation. Washington, DC, USA. July 10–14, 2016. V01AT08A006. ASME. https://doi.org/10.1115/FEDSM2016-7795
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