On Thu, May 19, 2016 at 3:00 PM, David Knezevic <david.kneze...@akselos.com>
wrote:
> On Thu, May 19, 2016 at 1:13 PM, Paul T. Bauman <ptbau...@gmail.com>
> wrote:
>
>> This all sounds fine, but I admit I'm curious about where you need this
>> as opposed to just using the element normal (not elem.normal()) to use in
>> applying the loads. I don't doubt that you do, but I haven't run into a
>> case yet where I needed this, although I've only been playing with
>> membranes and not shells proper. Regardless, thanks for taking this on.
>>
>
> The motivation for this change is to make life easier for users who are
> defining loads on shell meshes.
>
> Imagine you have a TRI3 mesh, and you want to impose surface loads in some
> (possibly overlapping) regions. To do that, you'd have to use subdomain
> IDs, which means you have to make the subdomain regions conform to the load
> regions. This can lead to unnecessarily complicated subdomains that are a
> pain for the person making the mesh.
>
> It's much easier to use sidesets for this purpose (which is what TRISHELL3
> and SHELL4 allow) because we can add multiple sidesets per side.
>
> Another advantage is that it allows us to use subdomains to store material
> properties (e.g. Young's modulus) and boundary_ids to store "surface
> properties" (like loads), which leads to a clearer separation of
> "volumetric" and "surface" properties.
>
Ah, OK, now I see. Yeah, I agree, this would definitely simplify those
cases. So far, my multiple material cases were on different manifolds, but
I can see where if you have something like a "welded" shell (or something)
with multiple materials, but all subjected to the same load, this would
simplify the load specification. Thanks for the clarification!
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