{"action":"closed","issue":{"url":"https://api.github.com/repos/idaholab/moose/issues/5959","labels_url":"https://api.github.com/repos/idaholab/moose/issues/5959/labels{/name}","comments_url":"https://api.github.com/repos/idaholab/moose/issues/5959/comments","events_url":"https://api.github.com/repos/idaholab/moose/issues/5959/events","html_url":"https://github.com/idaholab/moose/issues/5959","id":116441845,"number":5959,"title":"Segmentation fault when using displaced mesh with NS kernels","user":{"login":"mlesueur","id":11986570,"avatar_url":"https://avatars.githubusercontent.com/u/11986570?v=3","gravatar_id":"","url":"https://api.github.com/users/mlesueur","html_url":"https://github.com/mlesueur","followers_url":"https://api.github.com/users/mlesueur/followers","following_url":"https://api.github.com/users/mlesueur/following{/other_user}","gists_url":"https://api.github.com/users/mlesueur/gists{/gist_id}","starred_url":"https://api.github.com/users/mlesueur/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/mlesueur/subscriptions","organizations_url":"https://api.github.com/users/mlesueur/orgs","repos_url":"https://api.github.com/users/mlesueur/repos","events_url":"https://api.github.com/users/mlesueur/events{/privacy}","received_events_url":"https://api.github.com/users/mlesueur/received_events","type":"User","site_admin":false},"labels":[{"url":"https://api.github.com/repos/idaholab/moose/labels/C:%20Modules","name":"C: Modules","color":"0052cc"},{"url":"https://api.github.com/repos/idaholab/moose/labels/P:%20normal","name":"P: normal","color":"ededed"},{"url":"https://api.github.com/repos/idaholab/moose/labels/T:%20defect","name":"T: defect","color":"e11d21"}],"state":"closed","locked":false,"assignee":null,"milestone":null,"comments":3,"created_at":"2015-11-11T23:12:26Z","updated_at":"2015-12-01T00:01:00Z","closed_at":"2015-12-01T00:01:00Z","body":"Hi,\r\nI'm working on a Navier-Stokes simulation in a granular rock matrix that looks at the effects of grain's dilation on permeability (calculated with Darcy's Law).\r\n\r\nI use the variables disp_x and disp_y to make my grains swell but Navier Stokes flow is not affected by the swelling!\r\n![undisplaced_simulation](https://cloud.githubusercontent.com/assets/11986570/11105755/29137946-8925-11e5-9dbf-a4e0ea7388ea.png)\r\n![displaced_simulation](https://cloud.githubusercontent.com/assets/11986570/11105754/290a90a6-8925-11e5-9df1-dee537a6c651.png)\r\nAlthough the velocity should increase in the channels that are tightening.\r\n\r\nI figured out that I have to put in my Mesh block: displacements = 'disp_x disp_y'\r\nand put in everything that operates spatially: use_displaced_mesh = true\r\nIn my input file, it means BC, Kernels and Postprocessors.\r\n\r\nBut when I turn everything on, I got a segmentation fault.\r\nSo I tried to localise the problem and realise that the only things that are not working with use_displaced_mesh = true are the Navier Stokes kernels.\r\n\r\nFor an example of usage, you can follow my post on the mailing list:\r\nhttps://groups.google.com/forum/#!topic/moose-users/KvJZvdritew\r\n\r\nCheers,\r\n\r\nMartin Lesueur"}}