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material selection of hollow surface

Posted 2025年1月1日 GMT-5 02:54 3 Replies

Debadutta Mohanty
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How to make vacuum surface in inside a double rectangular geometry (inner rectangular )

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3 Replies Last Post 2025年1月5日 GMT-5 12:49
Robert Koslover Certified Consultant
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Posted: 2 months ago 2025年1月1日 GMT-5 09:52

Are you asking about specifying geometry, materials, physics, or something else? What kind of physical behavior or process do you want to model? E.g., mechanical deformation of a vacuum vessel? Microwave radiation inside an evacuated cavity? Or?? Note that examples of assigning material properties to domains and surfaces are provided in many of the example models provided in the included Application Library.

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Scientific Applications & Research Associates (SARA) Inc.
www.comsol.com/partners-consultants/certified-consultants/sara
Are you asking about specifying geometry, materials, physics, or something else? What kind of physical behavior or process do you want to model? E.g., mechanical deformation of a vacuum vessel? Microwave radiation inside an evacuated cavity? Or?? Note that examples of assigning material properties to domains and surfaces are provided in many of the example models provided in the included Application Library.
Ghufranullah Khan
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Posted: 2 months ago 2025年1月3日 GMT-5 03:57

I think he is asking about if a person want to assigned different material properties to the inside domain and outside domain. Suppose, in case of concrete, I want to model the aggreate as 3D spears and I want to assign it zero diffusion coefficient but there is a think, maybe 2mm layer around each spear , and i want to assign it a different diffusion coefficient. The question is how to assign this different diffusion coefficient to the two domain ? Thanks

I think he is asking about if a person want to assigned different material properties to the inside domain and outside domain. Suppose, in case of concrete, I want to model the aggreate as 3D spears and I want to assign it zero diffusion coefficient but there is a think, maybe 2mm layer around each spear , and i want to assign it a different diffusion coefficient. The question is how to assign this different diffusion coefficient to the two domain ? Thanks
Robert Koslover Certified Consultant
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Posted: 2 months ago 2025年1月5日 GMT-5 12:49
Updated: 2 months ago 2025年1月5日 GMT-5 12:52

The user interface directly allows assignment of different material properties to different domains. In the Model Builder, under Component 1 (or equivalent), right-click on Materials. Choose from one of the options (e.g., Add Material from Library, Browse Materials, Blank Material, etc.). Once you choose, you will end up with a Material in the list. Now go to the Settings panel. Under Geometric Entity Selection you will see a label "Geometric entity level." and "Selection:" Change the default of "All Domains" to "Manual." Now select whatever domains you want, to go with your new material. You can go back and define or select more materials and assign them to your domains as you wish. You can also assign materials to other geometric entity levels (which may or may not impact the model, depending on the physics). There are a huge number of possible material properties you can assign. See further down in the settings panel. Expand the "Material Properties" drop-down box. Like I said before, "examples of assigning material properties to domains and surfaces are provided in many of the example models provided in the included Application Library." Consider also looking at tutorial examples and some of the introductory videos available.

-------------------
Scientific Applications & Research Associates (SARA) Inc.
www.comsol.com/partners-consultants/certified-consultants/sara
The user interface directly allows assignment of different material properties to different domains. In the Model Builder, under Component 1 (or equivalent), right-click on Materials. Choose from one of the options (e.g., Add Material from Library, Browse Materials, Blank Material, etc.). Once you choose, you will end up with a Material in the list. Now go to the Settings panel. Under Geometric Entity Selection you will see a label "Geometric entity level." and "Selection:" Change the default of "All Domains" to "Manual." Now select whatever domains you want, to go with your new material. You can go back and define or select more materials and assign them to your domains as you wish. You can also assign materials to other geometric entity levels (which may or may not impact the model, depending on the physics). There are a huge number of possible material properties you can assign. See further down in the settings panel. Expand the "Material Properties" drop-down box. Like I said before, "examples of assigning material properties to domains and surfaces are provided in many of the example models provided in the included Application Library." Consider also looking at tutorial examples and some of the introductory videos available.

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