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How do I mesh for shells?

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Old   August 13, 2020, 23:28
Lightbulb How do I mesh for shells?
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Shihao Li
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Hello,

A mesh setting problem has confused me couple of days. My model is quite simple: a spherical shell, whose ratio of diameter and thickness is nearly 1000, contains 50% fluid fraction of liquid, and I focus on the movement and phase change of the liquid flow.

However, dozens of mesh operations have been tried but none could build the model.

Is there any practical way in Flow-3D v10 or v11 to set the mesh for thin objects such as spherical shells or cylindrical walls? Thank you and wait for your reply.

Best wishes.
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Old   August 14, 2020, 01:51
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Eric Lemont
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Do you need to represent the thin wall? For example, are you only concerned about the flow behaviour within the sphere itself?

If you need to include the thin wall in the model, the conforming mesh option can be helpful. Make a mesh block that has a resolution refined enough to capture the wall and make it the conforming mesh type. Then, have another mesh block to capture the other regions in your model that doesn't need to be as refined.
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Old   August 14, 2020, 04:35
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Shihao Li
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Quote:
Originally Posted by Flow Science Australasia View Post
Do you need to represent the thin wall? For example, are you only concerned about the flow behaviour within the sphere itself?

If you need to include the thin wall in the model, the conforming mesh option can be helpful. Make a mesh block that has a resolution refined enough to capture the wall and make it the conforming mesh type. Then, have another mesh block to capture the other regions in your model that doesn't need to be as refined.
Grateful for your reply.

I am afraid that the thin wall should be involved in the meshes.

As for the conforming mesh option, do you mean "Conform to meshing component" function? Actually, I tried it before. Because of the unusual ratio of diameter and thickness, the conforming mesh involved the whole sphere and the total number of real cells exceeded 1e9 which is the limitation of the program, so it seems that the method you mentioned did not work in my situation.

By the way, I am not clear why the number of cells in the conforming mesh reaches an extraordinary digit. As I am concerned, the program only counts the cells that conforming the thin wall, but in fact, the total number of cells refers to the whole cells conforming to the sphere shell as well as its cavity.

Waiting for your reply with my gratitude...
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