Home
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.
Incompressible Flow
The tutorials in this set illustrate various Simcenter STAR-CCM+ features for incompressible fluid flows as well as porosity and solution recording
Viscoelastic Flow: Basic Extrusion
This tutorial illustrates the extrusion of molten rubber through a die.
Setting Up the Physics
Physics models define the physical variables and phenomena in the simulation. The main phenomena to solve for in this simulation represent the material properties of liquid rubber and a flow of viscous fluid through the die, out into an extrusion.

Share

Link: copied

Breadcrumb: copied

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
  - Steady Flow: Lid-Driven Cavity Flow
    This tutorial demonstrates the performance of Simcenter STAR-CCM+ in solving a traditional square lid-driven cavity flow. The problem geometry consists of a two-dimensional 1 m² cavity. The cavity is covered by an impermeable wall that moves in the x-direction with constant velocity of 1 m/s. A stretched quadrilateral mesh with 6400 cells is used.
  - Steady Flow: Channel Flow with Multiple Meshes
    This tutorial describes a steady airflow simulation over an obstacle that is mounted at the bottom wall of a three-dimensional channel.
  - Steady Flow: Laminar and Turbulent Flow in an S-Bend
    This tutorial demonstrates the flow of an incompressible gas through an s-bend of constant diameter (2 cm), for both laminar and turbulent flow. The first part of the tutorial covers the laminar flow, with a Reynolds number (Re) of 500, and the second part covers the turbulent flow, Re = 50,000. The same pipe geometry is used in both cases.
  - Steady Flow: Backward Facing Step
    Steady flow over a backward facing step is a typical scenario to investigate the behaviour of reattaching flows. Understanding the behaviour of the flow is crucial for many applications such as designing heat exhangers, evalutating aerodynamic performance and improving flow control strategies.
  - Anisotropic Flow: Cyclone Separator
    The flow inside a cyclone separator is characterised by strong swirling motion and three-dimensional boundary layers. Properly accounting for these effects is a challenging problem for CFD simulations. This tutorial presents the initial step in setting up a coarse mesh cyclone flow simulation.
  - Porous Resistance: Isotropic Media
    This tutorial models flow through a catalyst geometry.
  - Porous Resistance: Orthotropic Media
    This tutorial solves the same problem as the Porous Resistance: Isotropic Media, except that the fluid in the porous region cannot flow in any direction other than the bulk flow (y-) direction.
  - Solution Recording and Playback: Vortex Shedding
    This tutorial demonstrates how to use the solution recording and playback module for capturing the results of transient phenomena.
  - Generalized Newtonian Fluid: Flow in a Static Mixer
    This tutorial demonstrates the process of setting up and analyzing the flow of a viscous fluid through a static mixer.
  - Viscoelastic Flow: Basic Extrusion
    This tutorial illustrates the extrusion of molten rubber through a die.
    - Prerequisites
      The Viscoelastic Flow: Basic Extrusion tutorial assumes that you are already familiar with certain techniques in Simcenter STAR-CCM+.
    - Creating the Simulation and Importing the Surface Mesh
      Create a simulation, name it ExtrusionDie, and import the supplied geometry.
    - Defining Simulation Topology
      Create regions and boundaries, and designate the inlet and outlet.
    - Generating the Volume Mesh
      Generate mesh for die and extrusion. The following steps create a volume mesh suitable for use with the finite element method.
    - Setting Up the Physics
      Physics models define the physical variables and phenomena in the simulation. The main phenomena to solve for in this simulation represent the material properties of liquid rubber and a flow of viscous fluid through the die, out into an extrusion.
    - Setting Up Boundary Conditions
      Set the boundary conditions on the die and extrusion.
    - Preparing to Visualize the Velocity Field and Shear Rate
      Create a vector scene for the fluid velocity and a scalar scene for the shear rate in the fluid.
    - Running the Simulation
      Run the simulation and view the results.
    - Introducing Viscoelasticity
      Add the Viscoelasticity model to the simulation.
    - Running the Viscoelastic Simulation
      Switching to the Viscoelastic model improves the realism of the simulation. Run the simulation again and view the change to the vector scene.
  - Material Calibration: Curve Fitting Non-Newtonian Model Parameters
    This tutorial illustrates the workflow for calibrating rheological model parameters from experimental rheological data through curve-fitting.
  - Polymer Melt Extrusion: Film Casting
    In industry, film casting is a common process for producing thin polymeric films. Cast films are used for applications such as food and textile packaging, stretch wraps, or plastic bags. Simcenter STAR-CCM+ provides a combination of the Film Casting model and the Free Surface model that allows you to simulate that process and to investigate the impact of various parameters on the resulting film.
- 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.

Setting Up the Physics

Physics models define the physical variables and phenomena in the simulation. The main phenomena to solve for in this simulation represent the material properties of liquid rubber and a flow of viscous fluid through the die, out into an extrusion.

To select the physics models:

For the physics continuum, Continua > Physics 1, select the following models, in order:


Group Box	Model
Enabled Models	Three Dimensional (Selected automatically)
Time	Steady
Material	Liquid
Flow	Viscous Flow Constant Density (Selected automatically) Laminar (Selected automatically)
Rheology	Generalized Newtonian
Optional Models	Free Surface

Selecting the Free Surface model adds mesh morphing to the simulation. This addition produces the swelling of the extrusion as it leaves the die. Here, you use the Bspline morpher method to move the mesh of the extrudate.

Select the Tools > Motions > Morphing node and set Morpher Method to BSpline.
Select Physics 1 > Models > Liquid > H2O and rename it to Liquid Rubber.

Select Liquid Rubber > Material Properties and set the following properties:


Node	Property	Value
Density	Method	Constant
Constant	Value	1500 kg/m^3
Dynamic Viscosity	Method	Constant
Constant	Value	2500 Pa-s

Select Models > Free Surface and set the following properties:


Property	Value
Extrusion Direction	X
Kinematic Condition	Line
Restrain Y	Activated

The Kinematic Condition setting of Line is the default and requires the velocity vector on the boundary to be aligned with cell edges and with the extrusion direction. The less restrictive Surface setting only requires the velocity vector to be parallel to cell faces. This requirement leaves a rotation degree of freedom to the free surface that is uniquely determined with a minimum energy principle.

Restrain Y must be activated because no plane of symmetry orthogonal to Y exists. This setting requires that the integral of the Y component of the velocity is 0.