7.6.2.23.1. Chemeq

Syntax: Burn Initiation [{of} SpeciesName] = Chemeq [Offset = offset | Min_Ignition_Spacing = min_ignition_spacing | Hard_Start_Ignition = hard_start_ignition]
Scope: Aria Material
Summary: Chemeq activated burn front. If min_ignition_spacing is provided then multiple burn initiations are supported, otherwise only one initiation per block is supported. Pick a minimum ignition spacing ( $d$ ) that is several times larger than your interface width ( $d > 3w$ ), and that provides $Da >> 10$ , where $Da = \frac{v_{b} d}{\alpha}$ ( $\alpha$ = thermal diffusivity and $v_{b}$ = burn speed). By default, the level set is shifted back by $w/2$ on ignition so the burn starts smoothly. To disable this and use a hard start (no shifting of burn front) set hard_start_ignition=1. Chemeq burn initiation also requires Chemeq burn ignition, which is created by default if not specified. The optional argument offset specifies an offset in temperature or temperature rate, such that the level set field is initialized at the chemeq deactivation temperature or rate minus the offset. Ignition is not affected by the offset.