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Note: This discussion is about an older version of the COMSOL Multiphysics® software. The information provided may be out of date.

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"Unexpected unit of input" error for material property defined by piecewise function

Posted 2018年2月20日 GMT-5 16:16 Electromagnetic Heating Version 4.2a 1 Reply

Karli Pena
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Hello,

I am using Comsol 4.2. defined a temperature-dependent heat capacity using a piecwise function. The argument is T and I defined the units of the argument and function as K and J/(kg*K), respectively. I named the function Cp_eff. When I enter Cp_eff(T) under the Value column for the Heat capactiy property, the entered value turns orange with the warning "Unexpected unit of input". The function unit is correct, so I don't know what the problem could be.

Thanks.

1 Reply Last Post 2018年2月21日 GMT-5 04:37
Magnus Ringh COMSOL Employee

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Posted: 7 years ago 2018年2月21日 GMT-5 04:37

Hi,

This is strange. The way you describe your setup, Cp_eff(T) is correct and should not generate any unit warning. I have tested it in 4.2 and it seems to work fine. I also tested it in COMSOL Multiphysics 5.3a, which is our latest release and contains loads of additional functionality and enhancements, and where this setup also works without any unit warning.

Best regards, Magnus Ringh, COMSOL

Hi, This is strange. The way you describe your setup, `Cp_eff(T)` is correct and should not generate any unit warning. I have tested it in 4.2 and it seems to work fine. I also tested it in COMSOL Multiphysics 5.3a, which is our latest release and contains loads of additional functionality and enhancements, and where this setup also works without any unit warning. Best regards, Magnus Ringh, COMSOL

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