Numerical assessment of subgrid scale models for scalar transport in large-eddy simulations of hydrogen-enriched fuels

作者：Martinez D Mira^*; Jiang X; Moulinec C; Emerson D R

来源：International Journal of Hydrogen Energy, 2014, 39(14): 7173-7189.

DOI：10.1016/j.ijhydene.2014.03.018

• Large-eddy simulation
• Linear-eddy model
• Eddy diffusivity
• Scalar transport
• Hydrogen
• Counter-gradient diffusion

A comparison of two different models addressing the scalar transport in large-eddy simulations is conducted for a non-reacting jet and an experimental flame. A simple approach based on a gradient diffusion closure is compared against the linear-eddy model in the context of hydrogen-enriched non-reacting fuel jets and flames burning hydrogen-enriched mixtures. The results show that the gradient diffusion model is not valid as a subgrid scale model for large-eddy simulations of mixtures containing hydrogen. It produces unphysical scalar fields with unrealistic temperature distributions. Approaches based on the linear-eddy model can be used instead to obtain appropriate representation of the scalar field and more accurate predictions of the scalar transport and the temperature field.

• 出版日期2014-5-5