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Physics Simulation
Simcenter STAR-CCM+ can model a wide range of physics phenomena including fluid mechanics, solid mechanics, heat transfer, electromagnetism, and chemical reactions. Scenarios with multiple time scales can be solved within the same simulation.
Dynamic Fluid Body Interaction
Dynamic Fluid Body Interaction (DFBI) in Simcenter STAR-CCM+ allows you to simulate the motion of a 6-DOF body with the displacement and rotation resulting from the defined mechanical and multiphysics interaction (flow, DEM, solid stress, EMAG).
DFBI Reference
For the DFBI model, refer to the following topics to set up the properties:
Body Motion Option Reference
For a 6-DOF body, Simcenter STAR-CCM+ provides several predefined body motion options by which you can achieve an efficient motion description for a certain application.
DFBI Equilibrium Forces Converged Event Reference
The DFBI Equilibrium Forces Converged event is available only when a 6-DOF body is associated with Equilibrium motion. The update event is created by right-clicking the Automation > Update Events node and selecting New Event > DFBI Equilibrium Forces Converged. This event enables you to monitor the converged force or moment values that act on a rigid body. The event triggers an update when the forces and moments are converged after a motion step. Typically, a new motion step is performed afterwards.

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Physics Simulation
Simcenter STAR-CCM+ can model a wide range of physics phenomena including fluid mechanics, solid mechanics, heat transfer, electromagnetism, and chemical reactions. Scenarios with multiple time scales can be solved within the same simulation.
- Defining Physics Workflow
  Simcenter STAR-CCM+ contains a wide range of physics models and methods for the simulation of single- and multi-phase fluid flow, heat transfer, turbulence, solid stress, dynamic fluid body interaction, aeroacoustics, and related phenomena. These physics models are all selected using a physics continuum.
- Setting Up Physics
  This section provides information on how to set up physics models in STAR-CCM+.
- Running Physics Simulations
  This part of the documentation describes preparation and procedures for running a Simcenter STAR-CCM+ simulation.
- Motion
  In general, motion can be defined as the change in position of a body with respect to a certain reference frame.
- Space
  The primary function of the Space models in Simcenter STAR-CCM+ is to provide methods for computing and accessing mesh metrics. Examples of mesh metrics include cell volume and centroid, face area and centroid, cell and face indexes, and skewness angle.
- Time
  The primary function of the time models in Simcenter STAR-CCM+ is to provide solvers that control the iteration and/or unsteady time-stepping.
- Mesh Motion and Adaption
  Many simulations that involve motion or geometry change require you to move or deform the mesh. Other simulations require localized mesh adaption in order to achieve an accurate solution.
- Materials
  Material models simulate substances, including various mixtures.
- Fluid Flow
  Many engineering design projects require you to predict the effect of flowing fluids on containing structures or immersed objects. While you can analyse simple scenarios with hand calculations, complex scenarios require you to apply numerical methods for accurate solutions.
- Viscous Flow
  Viscous Flow is a finite element approach for use with viscoelastic materials and other highly viscous non-Newtonian fluids, such as liquid plastics and rubber, dough and similar foodstuffs, molten glass, and mud. Viscoelastic materials resemble elastic materials, but also exhibit viscous effects, rebounding slowly from deformations.
- Passive Scalars
  Passive scalars are user-defined variables of arbitrary value, assigned to fluid phases or individual particles. They are passive because they do not affect the physical properties of the simulation. An intuitive way to think of passive scalars is as tracer dye in a fluid, but with numerical values instead of colors, and with no appreciable mass or volume.
- Heat Transfer
  Heat transfer is the study of energy in transit due to a temperature difference in a medium or between media. Heat transfer extends thermodynamic analysis through the study of the modes of energy transfer and through development of relations to calculate energy transfer rates.
- Species
  This chapter provides information about the chemical species models in Simcenter STAR-CCM+. A species model is activated whenever a multi-component liquid or multi-component gas is chosen from the Material model section of the Physics Model Selection dialog.
- Porous Media
  Simcenter STAR-CCM+ allows you to simulate the transport of a fluid or energy (e.g. heat, electrical charge) through porous materials using the concept that the action of the porous media can be represented using appropriate loss (or 'diffusion') coefficients.
- Adjoint
  The adjoint method is an efficient means to predict the influence of many design parameters and physical inputs on some engineering quantity of interest, that is, on the engineering objective of the simulation. In other words, it provides the sensitivity of the objective (output) with respect to the design variables (input).
- Fans and Blowers
  Simcenter STAR-CCM+ provides models for axial and radial fans where classical fan laws apply.
- Virtual Disk Model
  The virtual disk model is based upon the principle of representing propellers, turbines, rotors, fans, and so on, as an actuator disk. The actuator disk treatment is practical when you are concerned about the influence of the rotor/propeller behavior on the flow rather than knowing about the detailed interactions between the flow and the blades of the rotating device.
- Turbulence
  Most fluid flows of engineering interest are characterized by irregularly fluctuating flow quantities.
- Transition
  The term transition refers to the phenomenon of laminar to turbulence transition in boundary layers. A transition model in combination with a turbulence model predicts the onset of transition in a turbulent boundary layer.
- Wall Distance
  Wall distance is a parameter that represents the distance from a cell centroid to the nearest wall face with a non-slip boundary condition. Various physical models require this parameter to account for near-wall effects.
- Radiation
  The Radiation Model is the gateway, or entry point to all of the radiation modeling capabilities of Simcenter STAR-CCM+. This section describes Simcenter STAR-CCM+’s radiation modeling.
- Aeroacoustics
  Aeroacoustics investigates the aerodynamic generation of sound.
- Reacting Flow
  Simcenter STAR-CCM+ provides a selection of models that you can use to simulate a wide range of reacting flow applications.
- Internal Combustion Engines
  In an internal combustion engine (ICE), for example a gasoline engine, the process of combustion takes place in a cylinder (or cylinders) within the engine. The working fluid is a fuel and oxidizer mixture (usually air), which reacts to form combustion products.
- Multiphase Flow
  Multiphase flow is a term which refers to the flow and interaction of several phases within the same system where distinct interfaces exist between the phases. Simcenter STAR-CCM+ considers flow options where phases coexist as: gas bubbles in liquid, liquid droplets in gas, and/or solid particles in gas or liquid, and/or (large scale) free surface flows.
- Dynamic Fluid Body Interaction
  Dynamic Fluid Body Interaction (DFBI) in Simcenter STAR-CCM+ allows you to simulate the motion of a 6-DOF body with the displacement and rotation resulting from the defined mechanical and multiphysics interaction (flow, DEM, solid stress, EMAG).
  - Body Motion Options
    For a 6-DOF body, Simcenter STAR-CCM+ provides several body motion options by which you can specify an efficient motion description for a certain application.
  - Body Position and Body Local Coordinate System
    Simcenter STAR-CCM+ automatically creates a new Cartesian coordinate system with the default name Body n-CSys when a new 6-DOF body with the name Body n is created. This coordinate system (which can be referred to as the Body Local Coordinate System) moves together with the 6-DOF body and shows the current body position and orientation throughout the simulation.
  - Body Couplings
    Body couplings model the different types of connection between 6-DOF bodies or between a 6-DOF body and the environment. For each body coupling, an extra force is generated on each of the associated bodies.
  - Body Constraints
    A 6-DOF Body Constraint imposes kinematical constraints on the motion of a body. Constraints require that you activate the Multi-Body Motion option for the body.
  - Body Motion, Follow Motion, and Superposing Motion
    Simcenter STAR-CCM+ allows you to define complex motions with respect to the motion of a 6-DOF body. For example, you can superpose prescribed rotations and translations onto the motion of a 6-DOF body or create a motion that follows the motion of a 6-DOF body in some directions.
  - DFBI Workflow
    A DFBI (Dynamic Fluid Body Interaction) motion, different from a prescribed motion, solves the 6-DOF body movements resulting from the surrounding flow as well as the additional forces and moment. To set up a DFBI simulation, you first define a DFBI motion, set up a 6-DOF body, and then choose a simulation approach which realizes the movement of your 6-DOF body.
  - DFBI Reference
    For the DFBI model, refer to the following topics to set up the properties:
    - 6-DOF Bodies Reference
    - Body Motion Option Reference
      For a 6-DOF body, Simcenter STAR-CCM+ provides several predefined body motion options by which you can achieve an efficient motion description for a certain application.
      - DFBI Equilibrium Forces Converged Event Reference
        The DFBI Equilibrium Forces Converged event is available only when a 6-DOF body is associated with Equilibrium motion. The update event is created by right-clicking the Automation > Update Events node and selecting New Event > DFBI Equilibrium Forces Converged. This event enables you to monitor the converged force or moment values that act on a rigid body. The event triggers an update when the forces and moments are converged after a motion step. Typically, a new motion step is performed afterwards.
    - Initial Values Reference
      You must specify initial values for the 6-DOF body, which are used to define the body at the start of the simulation.
    - External Forces and Moments Reference
      The External Forces and Moments node contains all forces and moments that act on the 6-DOF body. These forces and moments include the force due to gravity, and the pressure and shear forces from the fluid.
    - Body Coupling Reference
      Simcenter STAR-CCM+ provides pre-defined and user-defined types of body-to-body and body-to-environment coupling elements.
    - Body Constraint Reference
      After creating a body contact constraint, you set up the properties according to the constraint type.
    - 6-DOF Body Reports Reference
      DFBI motion models activate specific reports for 6-DOF bodies. These reports allow you to visualize the acceleration, momentum, and velocity of the body in a given direction, the body orientation, and other key quantities.
    - 6-DOF Solver Reference
    - 6-DOF Motion Solver Reference
    - Follow Motion Reference
      After creating a body follow motion, you set up the motion properties:
    - Superposing Motions Reference
    - DFBI Morphing: Boundary Settings Reference
      For the DFBI morphing motion, you set morphing conditions at the boundaries. The same boundary conditions as for the morphing motion are available. In addition to these standard morphing boundary conditions, you can set specific DFBI morphing boundary conditions.
    - DFBI Field Function Reference
      Depending on the set up of the DFBI model, the following field functions are (partially) available:
- Harmonic Balance
  Some unsteady flows have a regularly repeating flow pattern, that is, they are time-periodic. Consider the flow from a fan blade passing across the entrance to a duct. Measurements of the instantaneous flow just within the duct would show a regularly repeating pattern. If the flow disturbances are sufficiently large, and propagate to the end of the duct, measurements of the unsteady flow at any point within the duct show repeating patterns. Such time-periodic patterns can be expressed using Fourier series.
- Solid Stress
  Simcenter STAR-CCM+ allows you to model the response of a solid continuum to applied loads, including mechanical loads and thermal loads that result from changes in the solid temperature.
- Electromagnetism
  Simcenter STAR-CCM+ allows you to model engineering applications involving electromagnetic phenomena. Example applications are electric motors, electric switches, and transformers, which can be modeled based on the classical theory of Electromagnetism.
- Electrochemistry
  Electrochemistry is the study of chemical reactions which occur due to an imposed electrical charge, or a difference in electrical potential at a boundary between a conductor–such as a metal–and an electrolyte. Simcenter STAR-CCM+ provides models that allow you to simulate batteries, corrosion, etching, and other electrochemical reactions.
- Electric Circuits
  Electrical circuits are conducting loops of interconnected electrical components, such as batteries, power sources, resistors, and inductors.
- Plasma
  Plasma is a state of matter similar to a gas that is composed partially or completely of charged particles such as ions and electrons which are not bound to each other.
- Batteries
  You can simulate batteries in Simcenter STAR-CCM+ using battery cells and battery cycling procedures that are defined either directly in Simcenter STAR-CCM+, or in the external software package Simcenter Battery Design Studio.
- Casting
  Casting simulations are performed using transient multiphase simulations using the VOF model with solidification. Conjugate heat transfer is applied between the solidifying melt and the solid mold.
- Region Sources
  This section provides some guidelines on how to use region sources for some common problems.
- Cell Quality Remediation
  The Cell Quality Remediation model helps you get solutions on a poor-quality mesh. This model identifies poor-quality cells, using a set of predefined criteria, such as Skewness Angle exceeding a certain threshold. Once these cells and their neighbors have been marked, the computed gradients in these cells are modified in such a way as to improve the robustness of the solution.
- Guidelines for Applying Simcenter STAR-CCM+
  This part of the documentation provides guidelines on applying Simcenter STAR-CCM+ models to your applications.
- Common Solvers Reference
  In Simcenter STAR-CCM+, solvers compute the solution during the simulation run.

DFBI Equilibrium Forces Converged Event Reference

The DFBI Equilibrium Forces Converged event is available only when a 6-DOF body is associated with Equilibrium motion. The update event is created by right-clicking the Automation > Update Events node and selecting New Event > DFBI Equilibrium Forces Converged. This event enables you to monitor the converged force or moment values that act on a rigid body. The event triggers an update when the forces and moments are converged after a motion step. Typically, a new motion step is performed afterwards.

DFBI Equilibrium Forces Converged Properties

Enabled

Specifies whether the update event is active or not.

Evaluated Status

Displays the current status of event evaluation (read-only). The possible statuses are:

Satisfied: Indicates the update event has been satisfied.
Unsatisfied: Indicates the update event is not satisfied.
Unevaluated: Indicates the update event is currently not evaluated.

Iteration

Displays the iteration at which the event was last evaluated. This property is read only.

Monitor

Specifies the monitor observed by the event.

Body

Selects the 6-DOF body with the Equilibrium motion option.