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Tutorials
Tutorials show you how to use Simcenter STAR-CCM+ for various applications in a step-by-step format with recommendations for setup, initialization and steps of the solution process specific to the application. Macro and simulation files are available for download for a large proportion of cases.
Simcenter STAR-CCM+ In-cylinder
The tutorials in this set illustrate features for simulating internal combustion engines in Simcenter STAR-CCM+ using the dedicated add-on Simcenter STAR-CCM+ In-cylinder.
Gasoline Engine: ECFM-3Z Combustion
In Simcenter STAR-CCM+ In-cylinder, you can simulate the combustion process in a gasoline engine using the Extended Coherent Flame Model Three Zone (ECFM-3Z).
Reducing Under-Relaxation Factor and Time-Step Size
To aid solution convergence, you reduce the under-relaxation factor for the pressure solver. For the automatic time-step control, you reduce the time-step size after fuel injection and decrease the time period in which the reduced time-step is used.

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Tutorials
Tutorials show you how to use Simcenter STAR-CCM+ for various applications in a step-by-step format with recommendations for setup, initialization and steps of the solution process specific to the application. Macro and simulation files are available for download for a large proportion of cases.
- Using Tutorial Macros and Files
  Macros, input files, and final simulation files for a range of tutorials are provided as an optional download package on the Support Center website. These macros and final simulation files are provided as an aid to the written tutorials, so that you can check your final results against the downloaded files, or against a simulation that is built and run using the macros.
- Introduction
  Welcome to the Simcenter STAR-CCM+ introductory tutorial. In this tutorial, you explore the important concepts and workflow. Complete this tutorial before attempting any others.
- Foundation Tutorials
  The foundation tutorials showcase the major features of Simcenter STAR-CCM+ in a series of short tutorials.
- Geometry
  The tutorials in this set illustrate various Simcenter STAR-CCM+ features for creating and working with parts and 3D-CAD.
- Mesh
  The tutorials in this set illustrate various STAR-CCM+ features for building CFD meshes.
- Incompressible Flow
  The tutorials in this set illustrate various Simcenter STAR-CCM+ features for incompressible fluid flows as well as porosity and solution recording
- Compressible Flow
  The tutorials in this set illustrate various Simcenter STAR-CCM+ features for compressible fluid flows as well as harmonic balance.
- Heat Transfer and Radiation
  The tutorials in this set illustrate various Simcenter STAR-CCM+ features for heat transfer, radiation, and thermal comfort.
- Multiphase Flow
  The tutorials in this set illustrate various Simcenter STAR-CCM+ features for simulating multiphase fluid flow problems
- Discrete Element Method
  The tutorials in this set illustrate various Simcenter STAR-CCM+ features for simulating Discrete Element Method problems
- Motion
  The tutorials in this set illustrate various STAR-CCM+ features for simulating problems with moving geometries and meshes, dynamic fluid body interaction, and rigid body motion:
- Reacting Flow
  The tutorials in this set illustrate various Simcenter STAR-CCM+ features for simulating reacting flows such as combustion.
- Solid Stress
  The tutorials in this set illustrate various Simcenter STAR-CCM+ features for computing deformation, strain, and stresses in solid regions. They also show how such computations can be coupled to the fluid behavior in an analysis of fluid-structure interaction.
- Aeroacoustics
  The tutorials in this set illustrate various Simcenter STAR-CCM+ features for solving aeroacoustic simulations.
- Electromagnetism
  The following tutorials illustrate features for solving problems that involve electromagnetic fields.
- Electrochemistry
  The following tutorial demonstrates chemical reactions induced by an electrical current.
- Battery
  The tutorials in this set illustrate various Simcenter STAR-CCM+ features for setting up a battery model:
- Automation
  The tutorials in this set illustrate various Simcenter STAR-CCM+ automation and macro features.
- Design Exploration
  The tutorials in this set illustrate various features for running design exploration studies in Design Manager.
- Coupling with CAE Codes
  The tutorials in this set illustrate various Simcenter STAR-CCM+ features for coupling with CAE codes:
- Analysis Methods
  The tutorials in this set illustrate various Simcenter STAR-CCM+ features for analysing and visualizing simulation data.
- Simcenter STAR-CCM+ In-cylinder
  The tutorials in this set illustrate features for simulating internal combustion engines in Simcenter STAR-CCM+ using the dedicated add-on Simcenter STAR-CCM+ In-cylinder.
  - Gasoline Engine: Motored
    Simcenter STAR-CCM+ In-cylinder provides an automated method to perform transient moving-mesh analyses of internal combustion engines.
  - Gasoline Engine: Charge Motion
    Simcenter STAR-CCM+ In-cylinder provides methods for predicting the charge motion in an internal combustion engine, including the injection of liquid fuel, the subsequent evaporation and mixing process, and the formation of fuel film on the engine walls.
  - Gasoline Engine: ECFM-3Z Combustion
    In Simcenter STAR-CCM+ In-cylinder, you can simulate the combustion process in a gasoline engine using the Extended Coherent Flame Model Three Zone (ECFM-3Z).
    - Prerequisites
      This tutorial guides you through the setup of the combustion simulation using the dedicated Simcenter STAR-CCM+ In-cylinder add-on in Simcenter STAR-CCM+.
    - Loading an Existing Simulation
      You start from an existing simulation file that contains objects and solution data from the tutorial Gasoline Engine: Charge Motion.
    - Setting Up the Combustion Models
      Here, you select the combustion and ignition models. To save runtime for this tutorial, you de-activate the liquid film model that was introduced in the Gasoline Engine: Charge Motion tutorial.
    - Setting Up the Ignitor
      For the ignition of the air-fuel mixture, you create an ignitor Engine Part, which provides a template for defining the ignition location and timing. You set the ignition timing to 700.0 deg CA, which is 20.0 deg CA BTDC.
    - Setting Analysis Duration and Initial Gas Composition
      The simulation starts at 300 deg CA and runs until 800 deg CA. To set the initial gas composition in the cylinder and ports, you use Automatic Composition Initialization.
    - Reducing Under-Relaxation Factor and Time-Step Size
      To aid solution convergence, you reduce the under-relaxation factor for the pressure solver. For the automatic time-step control, you reduce the time-step size after fuel injection and decrease the time period in which the reduced time-step is used.
    - Setting the Re-Mesh Criteria
      During the running simulation, Simcenter STAR-CCM+ In-cylinder re-meshes the geometry based on certain re-mesh criteria to ensure good cell quality for all crank angles. The default re-mesh criteria are based on best practices and are suitable in most cases. Here, you set re-mesh criteria that are more suitable for this engine geometry.
    - Preparing the Plots and Scenes for Visualization
      To watch the solution develop, you open the plots for the temperature and for the pressure in the cylinder. Additionally, you create a scene that displays the reaction progress variable.
    - Running the Simulation
      The simulation is now set up and ready to run.
    - Analyzing the Results
      After the simulation is complete, you visualize the results.
    - Summary
      The Gasoline Engine: Spark Ignition and Combustion tutorial demonstrates how to run a combustion simulation for a spark ignition four-stroke gasoline engine using Simcenter STAR-CCM+ In-cylinder.
  - Diesel Engine: Closed-Cycle Sector Model
    A closed-cycle analysis investigates the injection, ignition, and combustion process in an engine cylinder with all intake and exhaust valves closed. For axisymmetric cylinder geometries, Simcenter STAR-CCM+ In-cylinder allows you to model these stages of the engine cycle in a sector of the actual cylinder geometry in order to reduce runtime.
  - Uniflow Two-Stroke Engine
    Two-stroke engines complete the power cycle with two strokes of the piston while turning the crankshaft once (360 degrees). With Simcenter STAR-CCM+ In-cylinder, you can simulate different types of two-stroke engines—uniflow, loop flow, or cross flow engines.

Reducing Under-Relaxation Factor and Time-Step Size

To aid solution convergence, you reduce the under-relaxation factor for the pressure solver. For the automatic time-step control, you reduce the time-step size after fuel injection and decrease the time period in which the reduced time-step is used.

To set the pressure under-relaxation factor:

Right-click the Solvers node and select Edit.
In the Solver Settings group box, set Pressure Under-Relaxation Factor to 0.5.

To set the time-step size:

In the Time-Step Settings group box, click Settings.

In the Auto Time-Step Settings dialog, click the Injectors tab and set the following properties:


	Period	Time Step
After Injection	13.0 degCA	2.0E-6

Click OK.
Click Apply, then Close.
Save the simulation .