Setting Initial Conditions and Reference Values

The lower temperature limit for the specific heat polynomials imported from the materials database is 200 K. Although this temperature is much lower than we would expect to find in the converged solution, it is possible that temperatures below this may arise early on in the run. For this reason, it is necessary to increase the minimum allowable temperature to match the lower temperature limit for the polynomials.

Select the Reference Values > Minimum Allowable Temperature node.

In the Properties window, change the Value property to 200 K.

The initial condition of the combustor is a stationary flow field consisting entirely of air at 293 K.

Select the Initial Conditions > Mass Fraction > Constant node.

In the Properties window, click on the customizer button for the Value property to open the Constant - Value dialog.

Enter the data shown below and click OK.

Select the Constant node within the Static Temperature node.

In the Properties window, set the Value property to 293 K.

Select the Turbulence Specification node.

In the Properties window, select Intensity + Length Scale for the Method property.

Set the turbulence intensity to 0.05 and the turbulent length scale to 0.2.

Save the simulation.