Thank you, Federico Alzamora Previtali! Your assistance has been very helpful to me. I have reduced the time step value to 1.0E-06, and although the program is stable, it will take a very long time to complete the execution of the work. Is there a better way? Which of the following options is the best for a triangular mesh (Spring/Laplace/Boundary Layer, Diffusion, or Linearly Elastic Solid)?