The analysis for this problem is performed in two load steps:
| Load Step 1 (Inverse-Solving) – A nonlinear static analysis with inverse solving (INVOPT,ON) is performed on the input geometry of the model (at end-diastolic pressure (80 mm Hg)) to determine the zero-pressure geometry of the model and to obtain the stress/strain results on the input geometry. |
| After an inverse-solving load step, the solver generally allows an analysis to continue as forward-solving in a new load step. You can modify existing loads or apply new loads in the forward-solving step. For more information, see Reverting to Forward Solving and Continuing the Analysis as a New Load Step in the Structural Analysis Guide. |
| Load Step 2 (Forward-Solving) – To solve the model for end-systolic pressure (120 mm Hg), the solution continues using forward solving (INVOPT,OFF). The pressure load is increased from 80 mm Hg to 120 mm Hg. Continuing the solution as a new load step following the inverse-solving load step eliminates a step in the simulation, allowing for a more efficient analysis. |