Setting High-Accuracy Temporal Discretization

High-accuracy temporal discretization provides the option of doing 2nd-order time discretization with four or five time levels.

High-accuracy discretization schemes give faster unsteady solutions by using larger time steps and are more accurate. However, they are harder to stabilize and require more attention to mesh quality. Start with lower-order schemes and switch to high-accuracy schemes, if necessary, when all strong initial transients have been eliminated.

To use high-accuracy temporal discretization, select the Implicit Unsteady solver node and set Temporal Discretization to 2nd-order. The High-Accuracy Temporal Discretization node becomes available under the following solver nodes:

• Coupled Implicit
• Segregated Flow
• Segregated Energy, when Enable High-Accuracy Temporal Discretization is also activated.
• Segregated Species, when Enable High-Accuracy Temporal Discretization is also activated.