Setting the Solver Parameters and Stopping Criteria

You set the stopping criteria for each solver individually. In addition, you activate grid sequencing for the coupled solver.

To specify the stopping criterion for the primal flow:
  1. Right-click the Solvers > Steady > Stopping Criteria node and select New Criterion > Fixed Steps.
  2. Select the Fixed Steps node and set its Fixed Steps to 350.
For the coupled solver:
  1. To apply the automatic CFL control method, select the Solvers > Coupled Implicit node and set CFL Control Method to Automatic.
  2. To obtain a proper initialization, select the Solvers > Coupled Implicit > Expert Initialization node and set Method to Grid Sequencing.
You have two options to set adjoint stopping criteria:
  • Specify stopping criteria within a cost function—under the Adjoint > Adjoint Cost Functions > [cost function] > Stopping Criteria node. With this option, you can run various cost functions with different numbers of steps.
  • Specify a general stopping criteria for all the cost functions—under the Adjoint > Solvers > Adjoint Steady > Stopping Criteria node. With this option, all the cost functions are controlled with the same numbers of steps.

To define a general adjoint solver stopping criterion for the only one cost function:

  1. Right-click the Solvers > Adjoint > Solvers > Adjoint Steady > Stopping Criteria node and select New Criterion > Fixed Steps.
  2. Select the Fixed Steps node and set Fixed Steps to 150.
After defining the solver-specific stopping criteria, you delete the default global stopping criterion—Maximum Steps:
  1. Right-click the Stopping Criteria > Maximum Steps node and select Delete.