{"action":"opened","issue":{"url":"https://api.github.com/repos/geodynamics/specfem3d/issues/794","repository_url":"https://api.github.com/repos/geodynamics/specfem3d","labels_url":"https://api.github.com/repos/geodynamics/specfem3d/issues/794/labels{/name}","comments_url":"https://api.github.com/repos/geodynamics/specfem3d/issues/794/comments","events_url":"https://api.github.com/repos/geodynamics/specfem3d/issues/794/events","html_url":"https://github.com/geodynamics/specfem3d/issues/794","id":167571292,"number":794,"title":"How to choose the proper elementsize when I do meshing with CUBIT","user":{"login":"JimmyZJU","id":19942161,"avatar_url":"https://avatars.githubusercontent.com/u/19942161?v=3","gravatar_id":"","url":"https://api.github.com/users/JimmyZJU","html_url":"https://github.com/JimmyZJU","followers_url":"https://api.github.com/users/JimmyZJU/followers","following_url":"https://api.github.com/users/JimmyZJU/following{/other_user}","gists_url":"https://api.github.com/users/JimmyZJU/gists{/gist_id}","starred_url":"https://api.github.com/users/JimmyZJU/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/JimmyZJU/subscriptions","organizations_url":"https://api.github.com/users/JimmyZJU/orgs","repos_url":"https://api.github.com/users/JimmyZJU/repos","events_url":"https://api.github.com/users/JimmyZJU/events{/privacy}","received_events_url":"https://api.github.com/users/JimmyZJU/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":0,"created_at":"2016-07-26T10:12:21Z","updated_at":"2016-07-26T10:12:21Z","closed_at":null,"body":"What make me confused is that I don't konw how to choose the proper elementsize when I do meshing with CUBIT to make the calculation results accurate and reasonable. I've read the paper _RegSEM: a versatile code based on the spectral element method to compute seismic wave propagation at the regional scale_ by Cupillard P, Delavaud E, Burgos G, et al. In the paper, the author says that:\r\nIn classical applications of the SEM, 4 ≤ _N_ ≤ 8. For such values of _N_, at least five GLL nodes per wavelength are needed everywhere in the region to properly describe the seismic wavefield (e.g. Komatitsch & Vilotte 1998). This means that the size of the elements _d_ and the polynomial order _N_ are both constrained by the shortest wavelength _λmin_ propagated in the medium. This condition can be summarized by the following relation:\r\n_d ≤ N/5*λmin._\r\nHow to get the _λmin_ for different medium while I use a Gaussian or Ricker source time function?"}}
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