{"action":"created","issue":{"url":"https://api.github.com/repos/HiFiLES/HiFiLES-solver/issues/49","labels_url":"https://api.github.com/repos/HiFiLES/HiFiLES-solver/issues/49/labels{/name}","comments_url":"https://api.github.com/repos/HiFiLES/HiFiLES-solver/issues/49/comments","events_url":"https://api.github.com/repos/HiFiLES/HiFiLES-solver/issues/49/events","html_url":"https://github.com/HiFiLES/HiFiLES-solver/issues/49","id":70451369,"number":49,"title":"A \"strange\" phenomenon troubled me ","user":{"login":"jmaximelv","id":8256788,"avatar_url":"https://avatars.githubusercontent.com/u/8256788?v=3","gravatar_id":"","url":"https://api.github.com/users/jmaximelv","html_url":"https://github.com/jmaximelv","followers_url":"https://api.github.com/users/jmaximelv/followers","following_url":"https://api.github.com/users/jmaximelv/following{/other_user}","gists_url":"https://api.github.com/users/jmaximelv/gists{/gist_id}","starred_url":"https://api.github.com/users/jmaximelv/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/jmaximelv/subscriptions","organizations_url":"https://api.github.com/users/jmaximelv/orgs","repos_url":"https://api.github.com/users/jmaximelv/repos","events_url":"https://api.github.com/users/jmaximelv/events{/privacy}","received_events_url":"https://api.github.com/users/jmaximelv/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"milestone":null,"comments":22,"created_at":"2015-04-23T16:17:41Z","updated_at":"2015-04-29T17:46:43Z","closed_at":null,"body":"Hi all,\r\nI recently use HiFiLES (DNS) to simulate a 2D external flow. It stop at a certain time step for NaN error called by \"calc_diagnostic_fields_ppts\" (eles.cpp, in fact, it's \"u\" who should be attributed to).  I then halve the timestep  about 5 times, but they are all stop at the same ITERATION step! Both euler and RK advance methods have been tried. \r\nIt just conflict with my understanding. Can anyone help me out?\r\nThanks in advance!\r\nMaxime"},"comment":{"url":"https://api.github.com/repos/HiFiLES/HiFiLES-solver/issues/comments/97516316","html_url":"https://github.com/HiFiLES/HiFiLES-solver/issues/49#issuecomment-97516316","issue_url":"https://api.github.com/repos/HiFiLES/HiFiLES-solver/issues/49","id":97516316,"user":{"login":"mlopez14","id":5874667,"avatar_url":"https://avatars.githubusercontent.com/u/5874667?v=3","gravatar_id":"","url":"https://api.github.com/users/mlopez14","html_url":"https://github.com/mlopez14","followers_url":"https://api.github.com/users/mlopez14/followers","following_url":"https://api.github.com/users/mlopez14/following{/other_user}","gists_url":"https://api.github.com/users/mlopez14/gists{/gist_id}","starred_url":"https://api.github.com/users/mlopez14/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/mlopez14/subscriptions","organizations_url":"https://api.github.com/users/mlopez14/orgs","repos_url":"https://api.github.com/users/mlopez14/repos","events_url":"https://api.github.com/users/mlopez14/events{/privacy}","received_events_url":"https://api.github.com/users/mlopez14/received_events","type":"User","site_admin":false},"created_at":"2015-04-29T17:46:43Z","updated_at":"2015-04-29T17:46:43Z","body":"I meant SA model's predictive qualities are not guaranteed when the assumptions used to develop it are not satisfied. With LES you are letting the PDE behave as it chooses (within the limitation of the grid and discretization choices) so the accuracy does not rely as much on the modeling approach. \r\n\r\nIn the original paper the authors mention how they go about calibrating the SA turbulence model: http://arc.aiaa.org/doi/abs/10.2514/6.1992-439"}}