The Nonisothermal Reacting Turbulent Flow, SST Interface
The Nonisothermal Reacting Turbulent Flow, SST () multiphysics interface is used to simulate flow in the turbulent regime, heat transfer, and species transport and in a gas or liquid moving either in a free flow or through the interstices of a porous medium. This interface requires a license for either the Chemical Reaction Engineering Module, the Battery Design Module, or the Fuel Cell & Electrolyzer Module.
It combines the Chemistry, Transport of Concentrated Species, Turbulent Flow, SST, 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 both a mixture, where the concentrations are of comparable order of magnitude, and low-concentration solutes in a solvent.
The multiphysics coupling takes into account the heat of reaction in the fluid and at the surface of a porous catalyst, 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 stationary and time-dependent analysis in 2D, 2D axial symmetry, and 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 is modeled using wall functions
The equations solved by the Turbulent Flow, SST interface are the Navier–Stokes equations for conservation of momentum and the continuity equation for conservation of mass. The fluid flow turbulence is modeled using the SST model. The SST model is a low-Reynolds number model which means that it resolves the velocity, pressure, and concentrations all the way down to the wall. For that reason this physics interface is suited for studying mass transfer at high Schmidt numbers. The SST model depends on the distance to the closest wall, and the interface therefore includes a wall distance equation.
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 is modeled using wall functions.