Training Guide > Radiation Tutorials > Thermal Insulator Tutorial > Setting Solver Parameters and Stopping Criteria
Setting Solver Parameters and Stopping Criteria
This is the point at which you would adjust solver controls such as the under-relaxation factors and the maximum number of iterations.
Since we are only solving for temperature in this tutorial, the segregated flow solver will be frozen.
- Select the Solvers > Segregated Flow node.
- Select the Solver Frozen checkbox in the Properties window.
We will now adjust the under-relaxation factors for fluid and solid segregated energy to assist solution convergence.
- Select the Solvers > Segregated Energy node.
- In the Properties window, change the Fluid Under-Relaxation Factor value to
0.55 and the Solid Under-Relaxation Factor value to 0.99.
The default settings for the view factors calculator solver will be retained.
- Select the Solvers > Viewfactors Calculator node.
The default stopping criterion is set to end the calculation after 1000 iterations. Such a value is excessive for this case, so we will reduce the maximum number of iterations.
- Select the Stopping Criteria > Maximum Steps node.
- In the Properties window, change the Maximum Steps to
500. The solution will not run for more than 500 iterations, unless the stopping criterion is changed or disabled.
A new stopping criterion will also be created based on the energy equation residual. The minimum tolerance will be set to 1E-6.
- Right-click the Stopping Criteria node and select .
- Select Stopping Criteria > Energy Criterion > Minimum Limit node and in the Properties window set the Minimum Value to
1.0E-6.
- Save the simulation.
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