Question

a) Describe the difference between mesh convergence and force convergence.

FEA

Answer 1

Solution:

Mesh convergence determines how many elements are required in a model to ensure that the results of an analysis are not affected by changing the size of the mesh. System response (stress, deformation) will converge to a repeatable solution with decreasing element size.

A mesh convergence study verifies that the FEA model has converged to a solution. It also provides a justification for Mesh Independence and additional refinement is unnecessary.

Forced convergence: force is looked at as convergence criteria, in the sense that when the residual force is smaller then a force value used as criterion, then the substep is said to be converged. In ansys there are four convergence criteria (force, displacement, moment and rotation). It acts as a residual min technique and is sometimes better than mesh convergence as it reduces the computational load.

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