Fluid Film Phase Models
You create the necessary fluid film phases and specify the appropriate models. Simcenter STAR-CCM+ provides several models that you can select for each fluid film phase.
- Space: Three-Dimensional
- Material: Liquid, Liquid-Solid-Gas Mixture, or Multi-Component Liquid
- Fluid Film Flow: Flow Model
- Energy: Segregated Fluid Film Temperature or Coupled Temperature
- Viscous Regime: Laminar or Turbulent
- Reaction Regime: Reacting or Non-Reacting
- Equation of State: Constant Density and Polynomial Density
- Species: Segregated Species
- Optional Models: Form Drag Force
- Optional Models: Centrifugal Force
- Optional Models: Fluid Film Co-Simulation
- Optional Models: Electromagnetism
- Enabled Models: Phase Reacting Model
Material Models
The fluid film Liquid model and Multi-Component Liquid model are similar to the corresponding models for a physics continuum.
The Liquid-Solid-Gas Mixture model is available only for fluid film simulations. This model is similar to the Multi-Component Liquid model, but can have solid and gas components as well as liquid components. This model is intended for applications when a mixture of different thermodynamic states exists. The most common examples are mixtures of liquids and particulate solids, usually referred to as slurries.
In a Liquid-Solid-Gas Mixture phase, the solid components are assumed to be small particles that are carried with the mixture. These particles have no slip, as they are components rather than phases. When the fluid film is involved in a phase interaction between phases in different multiphase models (for example, Dispersed Multiphase impingement into a fluid film), the appropriate components are transferred between the phases.
Segregated Fluid Film Temperature and Coupled Temperature Energy Models
These energy models solve the total energy equation for the fluid film phase, and also account for the energy that is transferred due to droplets being added or removed.
The Segregated Fluid Film Temperature model is similar to the Segregated Temperature model for a physics continuum. To make this model available in the fluid film phase, the following models must be activated in the physics continuum: Segregated Flow and one of Segregated Fluid Temperature or Segregated Fluid Enthalpy.
The Coupled Temperature model is similar to the Coupled Energy model for a physics continuum. To make this model available in the fluid film phase, the following models must be activated in the physics continuum: Coupled Flow and Coupled Energy.
Both of these energy models have the same properties.
| Secondary Gradients | Neglect or include the boundary secondary gradients for diffusion and/or the interior secondary gradients at mesh faces. | |
| On | Include both secondary gradients. | |
| Off | Exclude both secondary gradients. | |
| Interior Only | Include the interior secondary gradients only. | |
| Boundaries Only | Include the boundary secondary gradients only. | |
Viscous Regime Model
The film phase viscous flow regime can be modeled as either laminar or turbulent. The Turbulent model, which includes the optional, Film Turbulent Viscosity model accounts for the modeling of the turbulence viscosity in the liquid film. See Turbulent Model Reference.
Reaction Regime Model
A multi-component fluid film phase can be Reacting or Non-Reacting. See Combustion and Other Reacting Flows.
Equation of State Models
The equation of state for a fluid film phase can be constant density or polynomial density. See General Equation of State Models.
Segregated Species Model
The Segregated Species model solves the species continuity equations for a multi-component fluid mixture. This model is identical to the Segregated Species model in a physics continuum.
Centrifugal Force Model
The Centrifugal Force model simulates the spreading or gathering of the liquid due to inertial pressure when a fluid film flows across a curved surface. The liquid spreads due to the inertial force that is exerted by the concave wall surface. The opposite effect, a gathering of the liquid towards the center, occurs on a convex surface.
| Note | This model is not compatible with moving meshes or moving reference frames. |
See Centrifugal Force.
Fluid Film Co-Simulation
Allows you to couple fluid films across simulations using the co-simulation framework. During the co-simulation, two simulations solve for different physics in the fluid film region and exchange data while the solvers run. For more information, see Simcenter STAR-CCM+ to Simcenter STAR-CCM+ Co-Simulation, and Specifying the Coupled Model Parts.
Electromagnetism Models
The Shell Electrodynamic Potential model, which requires the Optional Model, Electromagnetism, allows you to simulate electric currents within a fluid film phase.
Phase Reacting Model
Selected automatically (and not de-selectable) for fluid film phases within continua that contain the Electrochemical Reactions model. This model has no properties or settings to specify—it allows electrochemical reactions within the fluid film.