Key Differences Between Explicit and Implicit Analysis in Ansys

Explicit and Implicit analyses are two commonly used methods in Ansys for solving engineering problems. Here are the key differences between them:

1. Time Dependency:

Explicit analysis is suitable for dynamic events with high-speed impacts or rapid changes in load, as it solves the equations of motion in a time-dependent manner. Implicit analysis, on the other hand, is more appropriate for static or slow dynamic problems where time-dependent effects are not significant.

2. Time Steps:

In explicit analysis, smaller time steps are required to ensure the accuracy of the solution, especially for highly dynamic events. Implicit analysis, however, allows for larger time steps as it iteratively solves the equations at each time step.

3. Stability:

Implicit analysis is numerically stable for a wide range of problems and can handle large deformations and nonlinear material behavior. Explicit analysis, on the other hand, may suffer from numerical instability if the time step is too large or if the problem involves highly nonlinear behavior.

4. Computational Cost:

Explicit analysis is computationally more expensive compared to implicit analysis due to the need for smaller time steps and the explicit time integration method. Implicit analysis, while more computationally efficient, may require a longer solve time per time step due to the iterative nature of the solver.

5. Accuracy:

Implicit analysis generally provides more accurate results for static or slow dynamic problems, while explicit analysis may introduce numerical errors for highly dynamic events or when large deformations occur.

Overall, the choice between explicit and implicit analysis in Ansys depends on the nature of the engineering problem, the time dependency of the events, and the level of accuracy required for the simulation.