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The transient model reaches steady state

Posted Jun 20, 2023, 9:47 a.m. EDT 1 Reply

Tao Zhou
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Hi,now I have a question. Can the comsol transient model control the time to reach the steady state? If the time for a transient model to reach the steady state is known, the time for the steady state is known according to the Analytical expression.

1 Reply Last Post Jun 20, 2023, 10:44 a.m. EDT
Robert Koslover Certified Consultant
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Posted: 10 months ago Jun 20, 2023, 10:44 a.m. EDT

I encourage you to re-word your question. 1. In transient physical processes, the "time to reach steady state," assuming such a state ever occurs, is established by the physics, i.e., the laws of the universe. Thus, a Comsol model may help to compute or reveal this to you in some case of interest, but it cannot "control" it. Comsol Multiphysics models physics. It does not control physics. 2. "If the time for a transient model to reach the steady state is known..." then... no, it does not logically follow that it is known in accordance with some analytic expression. Although many processes in the universe can be understood via analytic expressions, some cannot. See, for some dramatic examples, https://en.wikipedia.org/wiki/Chaos_theory . Partial differential equations, which express much of the physics usually modeled with Comsol Multiphysics, often do not have analytic solutions. That's why we need numerical models.

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Scientific Applications & Research Associates (SARA) Inc.
www.comsol.com/partners-consultants/certified-consultants/sara
I encourage you to re-word your question. 1. In transient physical processes, the "time to reach steady state," assuming such a state ever occurs, is established by the physics, i.e., the laws of the universe. Thus, a Comsol model may help to compute or reveal this to you in some case of interest, but it cannot "control" it. Comsol Multiphysics *models* physics. It does not *control* physics. 2. "If the time for a transient model to reach the steady state is known..." then... no, it does *not* logically follow that it is known in accordance with some *analytic* expression. Although many processes in the universe can be understood via analytic expressions, some cannot. See, for some dramatic examples, https://en.wikipedia.org/wiki/Chaos_theory . Partial differential equations, which express much of the physics usually modeled with Comsol Multiphysics, often do not have analytic solutions. That's why we need numerical models.

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