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Interpolation file for heat source

Posted 18 mars 2019, 11:19 UTC−4 General, Heat Transfer, Parameters, Variables, & Functions Version 5.3 6 Replies

Yulia Semyashkina
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Good afternoon, colleagues! Help me please! I work in Somsol 5.3. I use the file with coordinates and power of heat source for the 2D model. x y power -0.5 0.5 0.033745233 -0.5 0.3 0.008032953 -0.5 0.1 0.02030695 -0.5 -0.1 0.027188813 -0.5 -0.3 0.022877194 -0.5 -0.5 0.022100812 -0.3 0.5 0.055818094 -0.3 0.3 0.181697745 -0.3 0.1 0.092770224 -0.3 -0.1 0.10023076 -0.3 -0.3 0.086700972 -0.3 -0.5 0.059760525 -0.1 0.5 1.49589704 -0.1 0.3 1.606590584 -0.1 0.1 0.295410478 -0.1 -0.1 0.194631072 -0.1 -0.3 0.107746763 -0.1 -0.5 0.066735532 The plot looks good, but does not affect the temperature. If I change the power - the temperature does not change. Tell me, please, what can I change in the model?

6 Replies Last Post 19 mars 2019, 10:46 UTC−4
Jeff Hiller COMSOL Employee

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Posted: 7 years ago 18 mars 2019, 11:40 UTC−4
Updated: 7 years ago 18 mars 2019, 11:43 UTC−4

Could it be that the heat source is not large enough to cause a change in temperature greater than .01 Kelvin over the time considered?

What happens if you multiply your heat source by a large number, say 1e6?

Jeff

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Jeff Hiller
Could it be that the heat source is not large enough to cause a change in temperature greater than .01 Kelvin over the time considered? What happens if you multiply your heat source by a large number, say 1e6? Jeff
Yulia Semyashkina
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Posted: 7 years ago 18 mars 2019, 11:46 UTC−4
Updated: 7 years ago 18 mars 2019, 11:53 UTC−4

The heat source, unfortunately, is quite large. 10 W and 100 ms for biological tissue is quite a lot. Thanks a lot for your help! The temperature has increased, but so many watts of biological tissue cannot withstand. Maybe you know where the error is?

The heat source, unfortunately, is quite large. 10 W and 100 ms for biological tissue is quite a lot. Thanks a lot for your help! The temperature has increased, but so many watts of biological tissue cannot withstand. Maybe you know where the error is?

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Yulia Semyashkina
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Posted: 7 years ago 18 mars 2019, 11:53 UTC−4
Updated: 7 years ago 18 mars 2019, 11:57 UTC−4

Thanks a lot for your help!

Thanks a lot for your help!
Jeff Hiller COMSOL Employee

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Posted: 7 years ago 18 mars 2019, 16:20 UTC−4

I would check, by integrating the volumetric heat source in post-processing, whether you are really applying the total power that you think you are.

Jeff

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Jeff Hiller
I would check, by integrating the volumetric heat source in post-processing, whether you are really applying the total power that you think you are. Jeff
Yulia Semyashkina
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Posted: 7 years ago 19 mars 2019, 08:35 UTC−4

Hello, Jeff!

I calculated the amount of watts in the file. It is equal to 10W. if I set the same material 10W, then it should heat up to 300 degrees Celsius. But if I ask from the file it does not heat up. Thank you very much.

Yulia

Hello, Jeff! I calculated the amount of watts in the file. It is equal to 10W. if I set the same material 10W, then it should heat up to 300 degrees Celsius. But if I ask from the file it does not heat up. Thank you very much. Yulia

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Jeff Hiller COMSOL Employee

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Posted: 7 years ago 19 mars 2019, 10:46 UTC−4

Your screnshot suggests that you took the sum of the local values in your Excel file and that they add up to 10; that is not the same as performing the integration of the heat source in your model. Please do the latter to determine how much heat is actually going into your model.

Should you need further assistance, please contact COMSOL's support team through www.comsol.com/support/ .

Best regards,

Jeff

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Jeff Hiller
Your screnshot suggests that you took the sum of the local values in your Excel file and that they add up to 10; that is not the same as performing the integration of the heat source in your model. Please do the latter to determine how much heat is actually going into your model. Should you need further assistance, please contact COMSOL's support team through www.comsol.com/support/ . Best regards, Jeff

Note that while COMSOL employees may participate in the discussion forum, COMSOL® software users who are on-subscription should submit their questions via the Support Center for a more comprehensive response from the Technical Support team.

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