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interpolation function

Posted 11 ott 2010, 10:19 GMT-4 3 Replies

Izaro LL
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Hi,

I would like to use a interpolation function as a boundary condition. I want to set a temperature distribution as boundary condition. The file that I´m using for the interpolation is the one I have gotten from other comsol program. It has the following structure:

% x y t
-0.2883498 -0.28064913 311.4114616733292
-0.2883498 -0.28532457 311.4367944630273
-0.28604147 -0.28298685 311.42340527424335
-0.2883498 -0.29 311.44533424076195
-0.28604147 -0.28766227 311.44045724511426
-0.28373313 -0.28532457 311.4258140327221
.....

But I´m getting the following error:

Error: 6170
Failed to evaluate variable.
- Variable: temp
- Geometry: 1
- Boundary: 3
Failed to evaluate variable.
- Variable: T0_htgh
- Defined as: temp
Failed to evaluate expression.
- Expression: -T+T0_htgh

Somebody could help me with this problem? (I`m using the 3.5amodel)

Thanks in advance!

Ann
3 Replies Last Post 19 mag 2011, 11:43 GMT-4
COMSOL Moderator

Hello Izaro LL

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Jesus Lucio
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Posted: 1 decade ago 28 feb 2011, 10:50 GMT-5
Hello, Ann:

Much time has passed since you sent your message. Nevertheless, if you are already interested in it, I think I can help you. Could you send the original model or at least a simplified version of it with your definitions, constants, functions and so on?

Jesus.
Hello, Ann: Much time has passed since you sent your message. Nevertheless, if you are already interested in it, I think I can help you. Could you send the original model or at least a simplified version of it with your definitions, constants, functions and so on? Jesus.
Briana Tomboulian
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Posted: 1 decade ago 19 mag 2011, 10:20 GMT-4
Hi,

I have similar errors. I'm trying to use an interpolated function, Q1, as the input for a heat source, but Q1 is not recognized as a variable. How do I use an interpolated function as a user-defined input? I will send the model if it helps.

Thanks!
Briana
Hi, I have similar errors. I'm trying to use an interpolated function, Q1, as the input for a heat source, but Q1 is not recognized as a variable. How do I use an interpolated function as a user-defined input? I will send the model if it helps. Thanks! Briana
Briana Tomboulian
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Posted: 1 decade ago 19 mag 2011, 11:43 GMT-4
FYI- just figured it out my problem with help of Jinlan Huang:

"You need to give an argument to the function when you call it. The argument
could be either an explicit number (e.g., int1(1)) or a variable as long as
it is define. For example, you can use int1(x) or int1(y) if you select
"Use space coordinates as arguments" check box when you define the
function."

Thanks Jinlan
FYI- just figured it out my problem with help of Jinlan Huang: "You need to give an argument to the function when you call it. The argument could be either an explicit number (e.g., int1(1)) or a variable as long as it is define. For example, you can use int1(x) or int1(y) if you select "Use space coordinates as arguments" check box when you define the function." Thanks Jinlan

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