Convergence comparison between fine mesh and coarse mesh in nonlinear static simulation

- September 6, 2021 at 2:31 am
  
  Haiquan
  Subscriber
  
  Hello
  In my understanding, fine mesh is easier to obtain a convergence result. But, I encountered some cases which was able to obtain convergence result with coarse mesh, while refining the mesh failed to converge(all the conditions were the same except the mesh). I am confused about this
- September 6, 2021 at 1:25 pm
  
  Ram Gopisetti
  Ansys Employee
  
  the core of FEA is to solve PDE's so the better the number of the PDE modeled via your boundary conditions and Loads along with the better discretization the better the solution be. As you increase the PDE count the solver has to iterated with in some bounds to stabiles the numerical error and this is normal, you need to increase the number of iteration counts via using some step or neqit to allow the solver to go extra mile to converge the results. and it takes time to solve.
  cheers, Ram