Spatial Discretization
Define the schemes for handling spatial gradients and convective terms. This setting controls the accuracy of your simulation, noting that options for higher accuracy may lead to solution stability problems. There are three preset selections of settings that you can choose from:
Default provides a balance between robustness and accuracy.
Conservative is the most robust option for your toughest meshes and problems. If necessary, it will sacrifice solution accuracy for robustness.
High Accuracy attempts to be as accurate as possible and avoids most artificial dissipation, which may lead to stability issues.
You can also select Custom and fine-tune the settings. You can choose between first order and second order convective schemes, turn on or off Robust Dissipation, and more. Hover over each property to view the definition.
Solution Controls
This section controls how quickly your simulation will converge, noting that the quicker the desired convergence, the more unstable the process can be.
There are three preset selections of settings that you can choose from:
Default (Conservative) uses settings that emphasize robustness.
Intermediate Performance provides a balance between speed and robustness, up to 2x faster than the default settings.
Aggressive Performance uses settings biased towards speed, up to 3x faster than the default settings.
As you move up from the default preset to the aggressive preset, the robustness of the solution method will decrease, but the potential time to a converged solution will also decrease.
Custom Settings
Click Customize to finely control Spatial Discretization and Solution Controls settings.
Note: We suggest trying the presets described above before using Custom settings.