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Interactive simulations are not, as it can be tempting to think, simulations that we sit and watch to ensure they converge; tweaking underrelaxation factorsModern simulation tools are generally robust and stable so if you find these sorts of techniques are needed, it’s time to check a few things, at the very least the mesh. No, here we are considering interacting with simulation results through advanced visualisation techniques, such as those provided by Virtual Reality (VR) or Augmented Reality (AR) capabilities and through real-time simulation, that enables live interaction with a simulation, such as adjusting part shape or location and seeing the immediate change in the simulation result.Interaction, immersion, visualisation are the key ideas that we’re considering. The concepts are not new, our dreams are immersive, interactive and vividly visualised and there are plenty of sci-fi concepts of the idea from the holodeck inStar Trek, Better than Life in Red Dwarf, the Matrix and Ready Player One, where much of the action takes place in the OASIS, the OntologicallyAnthropocentric Sensory Immersive Simulation. In these immersive, interactive virtual environments the user can experience and interact with facilities orsituations that don’t exist due to space limitations, location or simply because they no longer, or never have, existed.