Jeff Hiller
COMSOL Employee
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Posted:
4 years ago
May 14, 2020, 11:44 a.m. EDT
Can you attach your mph file, or at least tell us what expression you tried entering?
Jeff
-------------------
Jeff Hiller
Can you attach your mph file, or at least tell us what expression you tried entering?
Jeff
Please login with a confirmed email address before reporting spam
Posted:
4 years ago
May 19, 2020, 7:34 p.m. EDT
Updated:
4 years ago
May 19, 2020, 8:22 p.m. EDT
I am trying to provide an equation which looks like the following
![](data:image/png;base64,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)
Can I provide this equation in the global definitions? Or do I need to enter it by defining a PDE using the math module?
Thank you.
I am trying to provide an equation which looks like the following
R_2 = K \frac {dc_2}{dt}
Can I provide this equation in the global definitions? Or do I need to enter it by defining a PDE using the math module?
Thank you.
Jeff Hiller
COMSOL Employee
Please login with a confirmed email address before reporting spam
Posted:
4 years ago
May 20, 2020, 11:18 a.m. EDT
Updated:
4 years ago
May 20, 2020, 6:19 p.m. EDT
Yes, you should be able to enter an expression like that for your reaction term. The issue is likely one of syntax or scope of the variables involved. In particular, you mention that you are trying to use global definitions, but I doubt that c2 has a global scope, i.e. c2 is, I presume, defined at the Component level in your file.
Best,
Jeff
-------------------
Jeff Hiller
Yes, you should be able to enter an expression like that for your reaction term. The issue is likely one of syntax or scope of the variables involved. In particular, you mention that you are trying to use global definitions, but I doubt that c2 has a global scope, i.e. c2 is, I presume, defined at the Component level in your file.
Best,
Jeff