Implicit V.S. Explicit large eddy simulation of premixed turbulent combustion with multi-scale forcing
9th International Conference on Computational Fluid Dynamics, ICCFD 2016, İstanbul, Türkiye, 11 - 15 Temmuz 2016, (Tam Metin Bildiri)
- Yayın Türü: Bildiri / Tam Metin Bildiri
- Basıldığı Şehir: İstanbul
- Basıldığı Ülke: Türkiye
- Anahtar Kelimeler: Implicit LES, Premixed Turbulent Combustion, TFLES, WENO
- Orta Doğu Teknik Üniversitesi Adresli: Evet
Özet
Implicit LES (ILES), i.e. LES without any explicit subgrid modeling, and explicit LES with Thickened Flame and subgrid scale flame wrinkling models (TFLES) are performed for the numerical simulation of low-speed CH4/air turbulent premixed combustion. An experimental Bunsen burner with multi-grid turbulent forcing is simulated using a compressible solver based on different numerical methods, ranging from 4th order central finite difference to 5th order advanced WENO schemes. Results show that TFLES with a low dissipation scheme predicts quite well the experimental flame length and flame surface density. Implicit LES with advanced WENO schemes produce a slightly shorter but realistic flame, provided the grid spacing is of order of the laminar flame thickness.