A dynamic spectrally enriched subgrid-scale model for preferential concentration in particle-laden turbulence
Journal Article
·
· International Journal of Multiphase Flow
- Stanford Univ., Stanford, CA (United States)
- Cornell Univ., Ithaca, NY (United States)
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
A new subgrid-scale (SGS) model for turbulent velocity fluctuations is proposed for large-eddy simulations (LES) of dispersed multi-phase flows. The modeled velocity contains scales smaller than the LES grid resolution, thereby enabling the prediction of small-scale phenomena such as the preferential concentration of particles in high-strain regions. The construction of the spectrally enriched velocity field in physical space is made dynamically, and is based on (1) modeling the smallest resolved eddies of sizes comparable to the LES grid size via approximate deconvolution, and (2) reconstructing the SGS fluctuations via non-linear generation of small-scale turbulence. The model does not contain tunable parameters, can be deployed in non-uniform grids, and is applicable to inhomogeneous flows subject to arbitrary boundary conditions. Furthermore the performance of the model is assessed in LES of isotropic turbulence laden with inertial particles, where improved agreement with direct numerical simulation results is obtained for the statistics of preferential concentration.
- Research Organization:
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Sponsoring Organization:
- USDOE National Nuclear Security Administration (NNSA)
- Grant/Contract Number:
- 89233218CNA000001; NA0002373
- OSTI ID:
- 1512745
- Alternate ID(s):
- OSTI ID: 1547476
- Report Number(s):
- LA-UR--18-30740
- Journal Information:
- International Journal of Multiphase Flow, Journal Name: International Journal of Multiphase Flow Journal Issue: C Vol. 116; ISSN 0301-9322
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Turbophoresis of small inertial particles: theoretical considerations and application to wall-modelled large-eddy simulations
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journal | November 2019 |
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