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Reference.org
Transient modelling
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<p>Transient modelling (also called time‑dependent modelling or unsteady simulation) is the practice of analysing physical, biological or socio‑economic processes whose state variables vary continuously with time. Unlike <a href="/facts/Steady_state/qgrL4BNs">steady state</a> (equilibrium) analysis—where only the initial and final conditions are considered—transient modelling follows the complete evolution of a system from one state to another, capturing the rates, lags and feedbacks that occur along the way. </p>