Editing Simulation (section)

===Engineering, technology, and processes===
<!--If the above heading is changed, update #links in other articles that point to it, per [[MOS:HEAD]]-->Simulation is an important feature in engineering systems or any system that involves many processes. For example, in [[electrical engineering]], delay lines may be used to simulate [[propagation delay]] and [[Phase (waves)#Phase shift|phase shift]] caused by an actual [[transmission line]]. Similarly, [[dummy load]]s may be used to simulate [[Electrical impedance|impedance]] without simulating propagation and is used in situations where propagation is unwanted. A simulator may imitate only a few of the operations and functions of the unit it simulates. ''Contrast with'': [[emulator|emulate]].<ref name="FS1037C">[[Federal Standard 1037C]]</ref>

Most engineering simulations entail mathematical modeling and computer-assisted investigation. There are many cases, however, where mathematical modeling is not reliable. Simulation of [[fluid dynamics]] problems often require both mathematical and physical simulations. In these cases the physical models require [[similitude (model)|dynamic similitude]]. Physical and chemical simulations have also direct realistic uses, rather than research uses; in [[chemical engineering]], for example, [[process simulation]]s are used to give the process parameters immediately used for operating chemical plants, such as oil refineries. Simulators are also used for plant operator training. It is called Operator Training Simulator (OTS) and has been widely adopted by many industries from chemical to oil&gas and to the power industry. This created a safe and realistic virtual environment to train board operators and engineers. [[MiMiC Simulation Software|Mimic]] is capable of providing high fidelity dynamic models of nearly all chemical plants for operator training and control system testing.