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PDE in COMSOL with analytic material function in coefficient

Posted 29 mai 2024, 14:06 UTC−4 Porous Media Flow, Materials, Physics Interfaces Version 6.2 1 Reply

Muhammad Hamza Khalid
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Hi, I am a new user. I am trying to model internal erosion in a soil column. I am trying to punch in a PDE which has permeability in the one of the coefficients. The permeability-k is an analytical function. An error occurs that it is an undefined variable. How can I give the right syntax?

regards, Hamza

1 Reply Last Post 11 juin 2024, 15:12 UTC−4
Jeff Hiller COMSOL Employee

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Posted: 10 months ago 11 juin 2024, 15:12 UTC−4
Updated: 10 months ago 11 juin 2024, 15:15 UTC−4

The fact that you say it's a function but that the software complains about an undefined variable makes me suspect you forgot to pass the function's argument(s) between parentheses. For instance, you may have typed myfun instead of myfun(arg1,arg2), leading the software to think it should be looking for a variable called myfun.

Jeff

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Jeff Hiller
The fact that you say it's a *function* but that the software complains about an undefined *variable* makes me suspect you forgot to pass the function's argument(s) between parentheses. For instance, you may have typed myfun instead of myfun(arg1,arg2), leading the software to think it should be looking for a variable called myfun. Jeff

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