Setting Solver Parameters and Stopping Criteria

Training Guide > Combustion Tutorials > 3-Step Eddy Break-Up Tutorial > Setting Solver Parameters and Stopping Criteria

Setting Solver Parameters and Stopping Criteria

The default under-relaxation factors for the flow and turbulence equations are suitable for this case but those for the species and energy equations need to be reduced to ensure solution convergence.

Select the Solvers > Segregated Species node.

In the Properties window, change the Under-Relaxation Factor property to 0.8

Select the Segregated Energy node and change the Fluid Under-Relaxation Factor property to 0.8 also.

It is important that the under-relaxation factors for the species and energy equations are the same to ensure that the two solutions remain synchronized. Other species and energy modeling settings, such as the choice of differencing scheme, should also be kept the same.

The simulation will be run for 500 iterations, which is sufficient to achieve a steady-state solution. This number can be specified using a stopping criterion.

Select the Stopping Criteria > Maximum Steps node.

Change the Maximum Steps property to 500.

The solution will not run for more than 500 iterations, unless this stopping criterion is changed or disabled.

Save the simulation.

Return to CD-adapco STAR-CCM+ Index

Your Ad Here