## This content will become publicly available on April 26, 2020

## A dynamic spectrally enriched subgrid-scale model for preferential concentration in particle-laden turbulence

## Abstract

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.

- Authors:

- Stanford Univ., Stanford, CA (United States)
- Cornell Univ., Ithaca, NY (United States)
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

- Publication Date:

- Research Org.:
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

- Sponsoring Org.:
- USDOE National Nuclear Security Administration (NNSA)

- OSTI Identifier:
- 1512745

- Report Number(s):
- LA-UR-18-30740

Journal ID: ISSN 0301-9322

- Grant/Contract Number:
- 89233218CNA000001

- Resource Type:
- Accepted Manuscript

- Journal Name:
- International Journal of Multiphase Flow

- Additional Journal Information:
- Journal Volume: 116; Journal Issue: C; Journal ID: ISSN 0301-9322

- Publisher:
- Elsevier

- Country of Publication:
- United States

- Language:
- English

- Subject:
- 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; Particle-laden flows; Large-eddy simulation; Preferential concentration; Subgrid-scale modeling

### Citation Formats

```
Bassenne, Maxime, Esmaily, Mahdi, Livescu, Daniel, Moin, Parviz, and Urzay, Javier. A dynamic spectrally enriched subgrid-scale model for preferential concentration in particle-laden turbulence. United States: N. p., 2019.
Web. doi:10.1016/j.ijmultiphaseflow.2019.04.025.
```

```
Bassenne, Maxime, Esmaily, Mahdi, Livescu, Daniel, Moin, Parviz, & Urzay, Javier. A dynamic spectrally enriched subgrid-scale model for preferential concentration in particle-laden turbulence. United States. doi:10.1016/j.ijmultiphaseflow.2019.04.025.
```

```
Bassenne, Maxime, Esmaily, Mahdi, Livescu, Daniel, Moin, Parviz, and Urzay, Javier. Fri .
"A dynamic spectrally enriched subgrid-scale model for preferential concentration in particle-laden turbulence". United States. doi:10.1016/j.ijmultiphaseflow.2019.04.025.
```

```
@article{osti_1512745,
```

title = {A dynamic spectrally enriched subgrid-scale model for preferential concentration in particle-laden turbulence},

author = {Bassenne, Maxime and Esmaily, Mahdi and Livescu, Daniel and Moin, Parviz and Urzay, Javier},

abstractNote = {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.},

doi = {10.1016/j.ijmultiphaseflow.2019.04.025},

journal = {International Journal of Multiphase Flow},

number = C,

volume = 116,

place = {United States},

year = {2019},

month = {4}

}