Statistics of Conditional Fluid Velocity in the Corrugated Flamelets Regime of Turbulent Premixed Combustion: A Direct Numerical Simulation Study

Figure 5

(a) Variations of (𝑢₁)_𝑅𝑠/𝑆_𝐿 and (𝑢₁)_𝑅/𝑆_𝐿 with 𝑐̃ across the flame brush along with the predictions of (11c) according to ⟨𝑐⟩=𝑐̄ (shown as Model 1 in the legend) and ⟨𝑐⟩=𝑐̃ (shown as Model 2 in the legend) and (15). (b) Variations of [(𝑢₁)_𝑅−(𝑢₁)_𝑅𝑠]/𝑆_𝐿 and 𝐾₁(𝜕²𝑐/𝜕𝑥₁)/𝑆_𝐿=2𝐶_𝜇(𝑘̃‌²/𝜀̃)_𝑅(𝜕²𝑐/𝜕𝑥²₁)/[(𝜕𝑐/𝜕𝑥₁)𝑆_𝐿] with 𝑐̃. (c) Variations of (𝑢₁)_𝑃𝑠/𝑆_𝐿 and (𝑢₁)_𝑃/𝑆_𝐿 with 𝑐̃ across the flame brush.

(a)

(b)

(c)