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== Mathematical models ==
{{see also|Mathematical models}}
Mathematical models used in multiphysics simulations are generally a set of coupled equations. The equations can be divided into three categories according to the nature and intended role: [[governing equations|governing equation]], [[characteristic equation (calculus)|auxiliary equations]] and [[boundary value problem|boundary/initial conditions]]. A governing equation describes a major physical mechanism or process. Multiphysics simulations are numerically implemented with [[discretization]] methods such as the [[finite element method]], [[finite difference method]], or [[finite volume method]].<ref>{{Cite journal|last1=Bagwell|first1=Scott|last2=Ledger|first2=Paul D|last3=Gil|first3=Antonio J|last4=Mallett|first4=Mike|last5=Kruip|first5=Marcel|date=2017-12-07|title=A linearised ''hp''-finite element framework for acousto-magneto-mechanical coupling in axisymmetric MRI scanners
== Challenges of multiphysics simulation ==
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