Setting Material Properties

Training Guide > Combustion Tutorials > 3-Step Eddy Break-Up Tutorial > Setting Material Properties

Setting Material Properties

The components of the mixture and its material properties must now be defined.

Open the Multi-Component Gas > Gas Mixture node.

The options included within the Mixture Properties node define the material properties of the gas mixture as a whole. We will specify these before setting up the individual mixture components.

In the Mixture Properties node, select the Dynamic Viscosity node.

In the Properties window, change the Method property to Constant.

Similarly, select the Thermal Conductivity node and change the Method property to Lewis Number.

We are now ready to define the seven components of the mixture: C₃H₈, O₂, CO, H₂, CO₂, H₂O and N₂. All these species are included in the STAR-CCM+ materials database so detailed specification of their properties is not required.

Right-click the Gas Components node and select New Gas Component > C3H8 (Propane).

A new node named C3H8 will appear within the Gas Components node.

Following the method described above for C₃H₈, create the other six components in the following order: O₂, CO, H₂, CO₂, H₂O and N₂

Note that species ordering is important because their mass fractions will be used in field function definitions later in the tutorial. For reasons of improved numerical accuracy, it is advisable to create the component with the largest mass fraction, in this case N₂, last.

Once you have specified all components, it is necessary to define their specific heats using thermodynamic polynomials retrieved from the materials database.

Select the C3H8 > Component Properties > Specific Heat node.

In the Properties window, change the Method property to Thermodynamic Polynomial Data

Repeat this process for the remaining six components.

This completes the specification of material properties.

Save the simulation.

Return to CD-adapco STAR-CCM+ Index

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