{"action":"opened","issue":{"url":"https://api.github.com/repos/boutproject/BOUT-dev/issues/1431","repository_url":"https://api.github.com/repos/boutproject/BOUT-dev","labels_url":"https://api.github.com/repos/boutproject/BOUT-dev/issues/1431/labels{/name}","comments_url":"https://api.github.com/repos/boutproject/BOUT-dev/issues/1431/comments","events_url":"https://api.github.com/repos/boutproject/BOUT-dev/issues/1431/events","html_url":"https://github.com/boutproject/BOUT-dev/issues/1431","id":389335952,"node_id":"MDU6SXNzdWUzODkzMzU5NTI=","number":1431,"title":"Laplacian disagreement","user":{"login":"d7919","id":1793698,"node_id":"MDQ6VXNlcjE3OTM2OTg=","avatar_url":"https://avatars1.githubusercontent.com/u/1793698?v=4","gravatar_id":"","url":"https://api.github.com/users/d7919","html_url":"https://github.com/d7919","followers_url":"https://api.github.com/users/d7919/followers","following_url":"https://api.github.com/users/d7919/following{/other_user}","gists_url":"https://api.github.com/users/d7919/gists{/gist_id}","starred_url":"https://api.github.com/users/d7919/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/d7919/subscriptions","organizations_url":"https://api.github.com/users/d7919/orgs","repos_url":"https://api.github.com/users/d7919/repos","events_url":"https://api.github.com/users/d7919/events{/privacy}","received_events_url":"https://api.github.com/users/d7919/received_events","type":"User","site_admin":false},"labels":[{"id":730625911,"node_id":"MDU6TGFiZWw3MzA2MjU5MTE=","url":"https://api.github.com/repos/boutproject/BOUT-dev/labels/discussion","name":"discussion","color":"6a6ec4","default":false},{"id":213027811,"node_id":"MDU6TGFiZWwyMTMwMjc4MTE=","url":"https://api.github.com/repos/boutproject/BOUT-dev/labels/documentation","name":"documentation","color":"009800","default":false},{"id":230837101,"node_id":"MDU6TGFiZWwyMzA4MzcxMDE=","url":"https://api.github.com/repos/boutproject/BOUT-dev/labels/possible%20bug","name":"possible bug","color":"eb6420","default":false},{"id":56118092,"node_id":"MDU6TGFiZWw1NjExODA5Mg==","url":"https://api.github.com/repos/boutproject/BOUT-dev/labels/question","name":"question","color":"cc317c","default":true}],"state":"open","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":0,"created_at":"2018-12-10T14:50:34Z","updated_at":"2018-12-10T14:50:34Z","closed_at":null,"author_association":"MEMBER","body":"I've been experimenting with different Laplacian solvers in some of the test cases and I've found that some tests pass when changing just the type of the Laplacian solver. In particular I've been trying the non-fft methods `petsc` and `multigrid` and comparing to the `fft` methods `spt`, `tri` and `cyclic` for the `test-interchange-instability` integrated test.\r\n\r\nIs this known behaviour and if so do/should we document this?\r\n\r\nI came across this as I've been trying to implement another method using PETSc in a different way and found that the tests were failing."}}
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