Simulation 2021 improves performance, accuracy and setup reliability with automatic geometry correction for curved surfaces, faster multi‑core meshing and optimised solver selection. Updates to the Direct Sparse and FFE Plus solvers enhance speed and capacity. Terminology changes unify interaction definitions, while new default bonded‑gap handling and contact stabilisation produce more robust results on imperfect geometries. Mesh diagnostics isolate poor elements and automate refinement. Additional enhancements include clearer pin‑joint load reporting and evaluator warnings for friction or material issues, ensuring efficient, predictable and higher‑quality simulations