[Libmesh-users] [RE]Re: [RB] How to obtain subdomain information from nodes

[SKang <ss...@pu...>]

Thank you for your reply, David, even though the mail was written strangely.The mail was written normally in my mail platform butI don't know why it happened.​I have one more question. If I generate subdomains and a mesh using a commercial program, e.g., Trelis, do I need to redefine node numbers and subdomains in a libMesh code?If so, I think it is almostimpossible.I look forward your response.Thank you.Best regards,Kang

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ShinseongKang
GraduateStudent
PusanNationalUniversity
H.P.:010-9770-6595
E-mail:ss...@pu...

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----- Original Message -----From : David Knezevic <dav...@ak...>To : "SKang" <ss...@pu...>Cc : "Libmesh user group" <lib...@li...>Sent : 2018-03-19 21:13:20Subject : Re: [Libmesh-users] [RB] How to obtain subdomain information from nodesOn Mon, Mar 19, 2018 at 5:19 AM, SKang <ss...@pu...> wrote:Hello, all.I try to solve an RB problem similar to the RB example 5.Iused multiple domains with lengthscaling factors.So I need to plot themeshto match the scaling given by the input value to each subdomain.​For the libmesh code to plot, I will refer to "scale_mesh_and_plot" in the RB Example 5.​However, I don't know how to obtain subdomain information from nodes.So I want to ask two questions.1. Please let me know if there is a similar code to the following code for a node.-------------------------<wbr>------------------------------<wbr>--------2. If not, I want to know another way to obtain subdomain information from nodes.​Thank you.Best regards,KangIn libMesh subdomains are for elements, not for nodes.If you want to associate a subdomain ID with nodes, you could define a map from node ID to subdomain ID, and then loop over the elements of the mesh to get the subdomain ID, and then loop over the nodes of each element and fill in the map. Of course, the subdomains in this approach are not unique since elements with different subdomain IDs can link to the same node, so with this approach you would store the subdomain ID for one of the elements that touches each node.David