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Communication Dans Un Congrès Année : 2018

Uncertainty quantification for the eulerian-lagrangian simulation of evaporating sprays

Paolo Errante

Résumé

Evaporating sprays can be almost routinely simulated using an Eulerian-Lagrangian approach which relies on a Reynolds Averaged Navier Stokes (RANS) modeling of the continuous phase and a Lagrangian description of the discrete phase, including a turbulent dispersion model to express the effect of turbulent fluctuations within the carrier phase on the spray particles and an evaporation model for the spray droplets. Both descriptions are coupled through a two-way approach which accounts for the effects of the continuous phase on the droplets and the retroaction of the droplets on the carrier phase. Several experiments available in the literature have been used to calibrate the physical models involved in the numerical prediction of evaporating sprays (see [6][7]). The present study focuses on the simulation of evaporative sprays taking into account existing experimental and modeling uncertainties. Due to the significant cost of the numerical prediction, a surrogate model is used to quantify the effect of these uncertainties on quantities of interest. The non-intrusive Polynomial Chaos Expansion (PCE) technique available in the uncertainty quantification framework software UQLab is coupled with the deterministic Computational Fluid Dynamics (CFD) solver to yield statistical outputs (typically mean value and variance) of key quantities, such as the liquid mass flow rate for instance. The study analyzes the sensitivity of these outputs to experimental uncertainties on the continuous and discrete phase inputs (gas inlet velocity distribution, inlet liquid mass flow rate) and to modeling uncertainties in the turbulent dispersion model and evaporation model.
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Dates et versions

hal-03832555 , version 1 (27-10-2022)

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  • HAL Id : hal-03832555 , version 1

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Paolo Errante, Christophe Corre, S. Makhlouf. Uncertainty quantification for the eulerian-lagrangian simulation of evaporating sprays. 14th International Conference on Liquid Atomization and Spray Systems, ICLASS 2018, Jul 2018, Chicago, United States. ⟨hal-03832555⟩
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