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How is the "time" defined in Comsol?
Posted 12.10.2011, 04:49 GMT-4 Heat Transfer & Phase Change, Materials, Parameters, Variables, & Functions Version 4.2 3 Replies
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I would like to create a heat transfer model in which the external temperature increases with time. In this case I defined the external temperature in "heat flux" as "TemperatureExt" and defined this in variable definition as follows:
993.15*(1-exp(-time/tau))[K]
with tau as an defined constant.
But Comsol throws the following exception:
Failed to evaluate variable Jacobian.
- Variable: time
- Geometry: 1
- Boundary: 6
I thought that the intern time in Comsol is called "time", but obviously it isnt. So how it is defined?
Greetings
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the time variable is simply 't'.
Cheers
Edgar
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The expression "993.15*(1-exp(-t/tau))[K]" is still in yellow with the fault "unexpected unit of input". But I dont see there any fault.
Btw: tau = 57.6055973[1]
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