The Nonisothermal Reacting Flow, LES Smagorinsky Interface
The Nonisothermal Reacting Flow, LES Smagorinsky () multiphysics interface is used to simulate flow in the turbulent regime, heat transfer, and species transport in a gas or a liquid moving in free flow. This interface requires licenses for the CFD Module and either the Chemical Reaction Engineering Module, or the Battery Design Module, or the Fuel Cell & Electrolyzer Module.
It combines the Chemistry, Transport of Concentrated Species, LES Smagorinsky, and Heat Transfer in Fluids interfaces. The Reacting Flow multiphysics coupling, which is added automatically, couples fluid flow, heat transfer and mass transfer. The species transport supports a mixture, where the concentrations are of comparable order of magnitude.
The multiphysics coupling takes into account the heat of reaction in the fluid, enthalpy diffusion, and contributing mass fluxes. In addition, the temperature dependency of the chemical properties and reactions are accounted for.
The interface can be used for time-dependent analysis in 3D.
On the constituent physics interfaces:
The Chemistry interface defines thermodynamic properties and transport properties of the fluid. Provided that properties of each species have been defined, composition dependent mixture properties such as the heat capacity, the density, and the heat conduction are defined. The Chemistry interface also defines reaction rates for species involved in the chemical reactions added to the system.
The Transport of Concentrated Species interface solves for an arbitrary number of mass fractions. The species equations include transport by convection, diffusion and, optionally, migration in an electric field. Mass transfer close to walls can be modeled using wall functions. Crosswind diffusion is active by default for this interface, but can be deactivated if reaction fronts are adequately resolved in the simulation.
The equations solved by the LES Smagorinsky interface are the continuity equations for conservation of mass and the Navier–Stokes equation, augmented by a turbulent viscosity term, for conservation of momentum. The modeled term is inconsistent, which means that it does not vanish for a fully resolved flow.
The Heat Transfer interface solves for conservation of energy. A Fluid feature is active by default on the entire interface selection. Heat transfer close to walls can be modeled using wall functions. Crosswind diffusion is active by default for this interface, but can be deactivated if reaction fronts are adequately resolved in the simulation.