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Mesh Delete beyond certain temparature

Posted Jul 7, 2021, 3:49 a.m. EDT 4 Replies

Anshu Sahu
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Hello,

I am simulating heat transfer module for temperature analysis. I want to delete material after the vapourization temperature. How to do this process in comsol 5.6 version. Please help me for the same.

Thanks in advanced Anshu Sahu

4 Replies Last Post Jul 8, 2021, 4:42 a.m. EDT
Robert Koslover Certified Consultant
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Posted: 3 years ago Jul 7, 2021, 10:49 a.m. EDT
Updated: 3 years ago Jul 7, 2021, 10:50 a.m. EDT

Hmm. I'm not sure that's necessarily the best way to deal with vaporization, but... perhaps you could simply define the material properties to be a function of temperature, and employ a step function in that definition, such that for T>T_vaporization, the material properties become the same as your computational background space (e.g., air, vacuum, or whatever applies in your case). This wouldn't delete the mesh. But I doubt you would really want to delete the mesh anyway. Rather, you probably want the material to be replaced by whatever takes its place following vaporization, right? So I'd leave the mesh alone and let the material properties change. Others here may have different (and quite possibly better!) suggestions, so I encourage them to comment!

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Scientific Applications & Research Associates (SARA) Inc.
www.comsol.com/partners-consultants/certified-consultants/sara
Hmm. I'm not sure that's necessarily the best way to deal with vaporization, but... perhaps you could simply define the *material properties* to be a *function of temperature*, and employ a step function in that definition, such that for T>T_vaporization, the material properties become the same as your computational background space (e.g., air, vacuum, or whatever applies in your case). This wouldn't delete the *mesh*. But I doubt you would really want to delete the mesh anyway. Rather, you probably want the material to be replaced by whatever takes its place following vaporization, right? So I'd leave the mesh alone and let the material properties change. Others here may have different (and quite possibly better!) suggestions, so I encourage them to comment!
Henrik Sönnerlind COMSOL Employee

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Posted: 3 years ago Jul 8, 2021, 3:57 a.m. EDT

Robert's suggestion is close to how the Activation feature in Solid Mechanics works: When the material is not active, the stiffness is set to a very small value.

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Henrik Sönnerlind
COMSOL
Robert's suggestion is close to how the *Activation* feature in *Solid Mechanics* works: When the material is not active, the stiffness is set to a very small value.
Anshu Sahu
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Posted: 3 years ago Jul 8, 2021, 4:41 a.m. EDT

Hmm. I'm not sure that's necessarily the best way to deal with vaporization, but... perhaps you could simply define the material properties to be a function of temperature, and employ a step function in that definition, such that for T>T_vaporization, the material properties become the same as your computational background space (e.g., air, vacuum, or whatever applies in your case). This wouldn't delete the mesh. But I doubt you would really want to delete the mesh anyway. Rather, you probably want the material to be replaced by whatever takes its place following vaporization, right? So I'd leave the mesh alone and let the material properties change. Others here may have different (and quite possibly better!) suggestions, so I encourage them to comment!

Thanks Roberts for the suggestion.

If i will use Air properties after Vapourization temperature , then in that case i don't get deformed geometry. Kindly give some solution to get deformed geometry.

Thanks in advance

Regards Anshu Sahu

>Hmm. I'm not sure that's necessarily the best way to deal with vaporization, but... perhaps you could simply define the *material properties* to be a *function of temperature*, and employ a step function in that definition, such that for T>T_vaporization, the material properties become the same as your computational background space (e.g., air, vacuum, or whatever applies in your case). This wouldn't delete the *mesh*. But I doubt you would really want to delete the mesh anyway. Rather, you probably want the material to be replaced by whatever takes its place following vaporization, right? So I'd leave the mesh alone and let the material properties change. Others here may have different (and quite possibly better!) suggestions, so I encourage them to comment! Thanks Roberts for the suggestion. If i will use Air properties after Vapourization temperature , then in that case i don't get deformed geometry. Kindly give some solution to get deformed geometry. Thanks in advance Regards Anshu Sahu
Anshu Sahu
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Posted: 3 years ago Jul 8, 2021, 4:42 a.m. EDT

Robert's suggestion is close to how the Activation feature in Solid Mechanics works: When the material is not active, the stiffness is set to a very small value.

What are the other means to get deformed geometry in case of laser ablation.

>Robert's suggestion is close to how the *Activation* feature in *Solid Mechanics* works: When the material is not active, the stiffness is set to a very small value. What are the other means to get deformed geometry in case of laser ablation.

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