A priori assessment of closures for scalar dissipation rate transport in turbulent premixed flames using direct numerical simulation

The scalar dissipation rate transport in both the corrugated flamelet and thin reaction zone regimes is studied using three-dimensional direct numerical simulation (DNS) databases for freely propagating statistically planar turbulent premixed flames. Both flames have comparable turbulent Reynolds number but the flame representing the corrugated flamelet combustion regime has a global Damkohler number, Da>1, whereas the second flame representing the thin reaction zone regime has Da 1 flame, while it produces the scalar gradients in the Da<1 flame. Simple algebraic models for the con...

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