Chemistry

Chemical reaction models can be applied to situations involving combustion, power generation, propulsion systems, and chemical vapor deposition, among others. When considering chemical reaction simulations, two factors should be considered:

                                          the speed of the reaction, and

                                          the characteristic time scale of the flow itself

Reacting flows are classified according to the relative magnitudes of these time scales, and the analysis dictates which type of chemical reaction model should be used. STORM offers six types of reaction models with varying degrees of complexity and generality.

   Finite Rate

Full finite-rate, multi-step chemistry model with kinetic source terms. The most general of all STORM reaction models; useful for situations where reaction and flow time scales are comparable.

 

   Mixture Fraction

Specialized finite-rate, single-step chemistry model designed primarily for oxidation/combustion simulations.

   Instantaneous

"Fast chemistry" mixture fraction model for situations where the reaction time scale is much less than that of the flow.

   Equilibrium

Specialized "fast chemistry" model for two-way reactions; products based solely on thermodynamic state of the system.

   Frozen

Solves for chemical species transport without reaction (mixing only).

   CVD Finite-rate, multi-step chemistry model for chemical vapor deposition. Activates a Soret diffusion term in the species conservation equation. Requires specification of a surface reaction model.