A deconvolution-based approach for a posteriori validation of subgrid-scale models: Application to agglomerating nanoparticles
Abstract
Large eddy simulation (LES) of turbulent reacting flows relies on several models accounting for subgrid scale effects on flow dynamics, scalar transport, source terms, nanoparticle dynamics or spray evolution for instance. In the literature, many subgrid approaches have been developed in the last decades based on a priori analysis of direct numerical simulations (DNS). Generally, to be validated a posteriori, these models are directly used in LES of reference DNS or of experimental configurations. However, an actual LES combines several models enabling only the validation of the global LES strategy, but not of each individual model. To overcome this issue, the present work proposes a rigorous a posteriori validation strategy based on the transport of a filtered scalar equation by unfiltered flow variables, so that the sole filtered quantity is the scalar itself. By solving these equations on a DNS-like grid, and using deconvolution algorithms, the effect of a single subgrid model can be analyzed, while exactly evaluating the other terms. The proposed approach is illustrated investigating a simple case represented by agglomerating nanoparticles in a turbulent flow. The considered test case will allow to rigorously evaluate the validity of literature subgrid models for the coagulation term, classically used to perform LES of soot production and metal-oxide synthesis in turbulent flames.
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BibTeX
@article{harchaoui2026deconvolutionbased,
title = {{A deconvolution-based approach for a posteriori validation of subgrid-scale models: Application to agglomerating nanoparticles}},
author = {Muhammad Harchaoui and Aymeric Vié and Christian Tenaud and Denis Veynante and Benedetta Franzelli},
journal = {Proceedings of the Combustion Institute},
year = {2026},
month = jul,
doi = {10.1016/j.proci.2026.106153},
url = {https://hal.science/hal-05778291v1},
note = {CC BY-NC-ND 4.0},
}
RIS
TY - JOUR
TI - A deconvolution-based approach for a posteriori validation of subgrid-scale models: Application to agglomerating nanoparticles
AU - Muhammad Harchaoui
AU - Aymeric Vié
AU - Christian Tenaud
AU - Denis Veynante
AU - Benedetta Franzelli
PY - 2026
DA - 2026/07/02
JO - Proceedings of the Combustion Institute
DO - 10.1016/j.proci.2026.106153
UR - https://hal.science/hal-05778291v1
AB - Large eddy simulation (LES) of turbulent reacting flows relies on several models accounting for subgrid scale effects on flow dynamics, scalar transport, source terms, nanoparticle dynamics or spray evolution for instance. In the literature, many subgrid approaches have been developed in the last decades based on a priori analysis of direct numerical simulations (DNS). Generally, to be validated a posteriori, these models are directly used in LES of reference DNS or of experimental configurations. However, an actual LES combines several models enabling only the validation of the global LES strategy, but not of each individual model. To overcome this issue, the present work proposes a rigorous a posteriori validation strategy based on the transport of a filtered scalar equation by unfiltered flow variables, so that the sole filtered quantity is the scalar itself. By solving these equations on a DNS-like grid, and using deconvolution algorithms, the effect of a single subgrid model can be analyzed, while exactly evaluating the other terms. The proposed approach is illustrated investigating a simple case represented by agglomerating nanoparticles in a turbulent flow. The considered test case will allow to rigorously evaluate the validity of literature subgrid models for the coagulation term, classically used to perform LES of soot production and metal-oxide synthesis in turbulent flames.
SN - 1540-7489
SN - 1540-7489
ER -