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How to draw time derivative of temperature in result

Posted 06.04.2022, 08:35 GMT-4 Heat Transfer, Results & Visualization Version 5.3a 2 Replies

Michal Pohanka
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I have results computed using Time Dependent solver. It is cooling of 3D plate. I can create 3D Plot for temperature. Is it possible to show reults for cooling rate which is time derivative of temperature? How? I tried this in expression: d(T,t) but Comsol says: Time derivative only allowed with respect to mesh time.

2 Replies Last Post 06.04.2022, 09:11 GMT-4
Michal Pohanka
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Posted: 3 years ago 06.04.2022, 09:06 GMT-4

mesh.dt(T)

mesh.dt(T)
Magnus Ringh COMSOL Employee

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Posted: 3 years ago 06.04.2022, 09:11 GMT-4
Updated: 3 years ago 06.04.2022, 09:12 GMT-4

Hi,

I'm not sure if d(T,t) (or Tt) would work in version 6.0; it does in a simple heat transfer model that I just tested. But if you want to use a derivate with respect to mesh time, use d(T,TIME) or mesh.dt(T). It could be the case in a model that uses an ALE (algebraic Lagrangian-Eulerian) formulation, for example.

Best regards,

Magnus

Hi, I'm not sure if `d(T,t)` (or `Tt`) would work in version 6.0; it does in a simple heat transfer model that I just tested. But if you want to use a derivate with respect to mesh time, use `d(T,TIME)` or `mesh.dt(T)`. It could be the case in a model that uses an ALE (algebraic Lagrangian-Eulerian) formulation, for example. Best regards, Magnus

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