{"action":"created","issue":{"url":"https://api.github.com/repos/StrikeNP/trac_test/issues/867","repository_url":"https://api.github.com/repos/StrikeNP/trac_test","labels_url":"https://api.github.com/repos/StrikeNP/trac_test/issues/867/labels{/name}","comments_url":"https://api.github.com/repos/StrikeNP/trac_test/issues/867/comments","events_url":"https://api.github.com/repos/StrikeNP/trac_test/issues/867/events","html_url":"https://github.com/StrikeNP/trac_test/issues/867","id":328665283,"node_id":"MDU6SXNzdWUzMjg2NjUyODM=","number":867,"title":"SAM_CLUBB ARM9707 develops large tke near the surface and crashes (Trac #9)","user":{"login":"StrikeNP","id":2577059,"node_id":"MDQ6VXNlcjI1NzcwNTk=","avatar_url":"https://avatars0.githubusercontent.com/u/2577059?v=4","gravatar_id":"","url":"https://api.github.com/users/StrikeNP","html_url":"https://github.com/StrikeNP","followers_url":"https://api.github.com/users/StrikeNP/followers","following_url":"https://api.github.com/users/StrikeNP/following{/other_user}","gists_url":"https://api.github.com/users/StrikeNP/gists{/gist_id}","starred_url":"https://api.github.com/users/StrikeNP/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/StrikeNP/subscriptions","organizations_url":"https://api.github.com/users/StrikeNP/orgs","repos_url":"https://api.github.com/users/StrikeNP/repos","events_url":"https://api.github.com/users/StrikeNP/events{/privacy}","received_events_url":"https://api.github.com/users/StrikeNP/received_events","type":"User","site_admin":false},"labels":[{"id":950816635,"node_id":"MDU6TGFiZWw5NTA4MTY2MzU=","url":"https://api.github.com/repos/StrikeNP/trac_test/labels/Migrated%20from%20Trac","name":"Migrated from Trac","color":"FFFFFF","default":false},{"id":950816732,"node_id":"MDU6TGFiZWw5NTA4MTY3MzI=","url":"https://api.github.com/repos/StrikeNP/trac_test/labels/clubb_src","name":"clubb_src","color":"FFFFFF","default":false},{"id":950816644,"node_id":"MDU6TGFiZWw5NTA4MTY2NDQ=","url":"https://api.github.com/repos/StrikeNP/trac_test/labels/defect","name":"defect","color":"FFFFFF","default":false},{"id":950816791,"node_id":"MDU6TGFiZWw5NTA4MTY3OTE=","url":"https://api.github.com/repos/StrikeNP/trac_test/labels/vlarson@uwm.edu","name":"vlarson@uwm.edu","color":"FFFFFF","default":false}],"state":"open","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":9,"created_at":"2018-06-01T21:24:08Z","updated_at":"2018-06-01T21:44:09Z","closed_at":null,"author_association":"OWNER","body":"Set up:\nSAM_CLUBB, 128 vertical levels, dt = 10 s or dt = 2 s, Morrison microphysics, CAM radiation, dx = 16 km, 4 grid columns.\n\nnrad is immaterial.  The difference in set-up from the nightly plots is that the nightly plots uses only 30 vertical levels or so.\n\nSymptom: u2 is very large ( 50,000 (m/s)**2 ) near the ground.  However, all other fields look fine, including SAM's u and CLUBB's up2 and um. \n\nPossible cause: CLUBB's eddy diffusivity has a large gradient near the ground.  Perhaps then CLUBB's contribution to SAM's momentum (u_tndcy in advance_clubb_sgs) is too large, causing a CFL violation.  However, if this is the case, it seems strange that u and um are small and smooth, and do not exhibit sawtooth noise.\n\nNext step: Perhaps reduce the coefficient in u_tndcy from 0.4 to some smaller number, e.g. 0.2.\n\nMigrated from http://carson.math.uwm.edu/trac/clubb/ticket/9\n```json\n{\n    \"status\": \"closed\", \n    \"changetime\": \"2012-02-14T19:52:10\", \n    \"description\": \"Set up:\\nSAM_CLUBB, 128 vertical levels, dt = 10 s or dt = 2 s, Morrison microphysics, CAM radiation, dx = 16 km, 4 grid columns.\\n\\nnrad is immaterial.  The difference in set-up from the nightly plots is that the nightly plots uses only 30 vertical levels or so.\\n\\nSymptom: u2 is very large ( 50,000 (m/s)**2 ) near the ground.  However, all other fields look fine, including SAM's u and CLUBB's up2 and um. \\n\\nPossible cause: CLUBB's eddy diffusivity has a large gradient near the ground.  Perhaps then CLUBB's contribution to SAM's momentum (u_tndcy in advance_clubb_sgs) is too large, causing a CFL violation.  However, if this is the case, it seems strange that u and um are small and smooth, and do not exhibit sawtooth noise.\\n\\nNext step: Perhaps reduce the coefficient in u_tndcy from 0.4 to some smaller number, e.g. 0.2.\", \n    \"reporter\": \"vlarson@uwm.edu\", \n    \"cc\": \"\", \n    \"resolution\": \"Verified by V. Larson\", \n    \"_ts\": \"1329249130000000\", \n    \"component\": \"clubb_src\", \n    \"summary\": \"SAM_CLUBB ARM9707 develops large tke near the surface and crashes\", \n    \"priority\": \"major\", \n    \"keywords\": \"ARM9707, arm_97, SAM_CLUBB, crash, horizontal winds\", \n    \"time\": \"2009-05-05T21:21:33\", \n    \"milestone\": \"\", \n    \"owner\": \"vlarson@uwm.edu\", \n    \"type\": \"defect\"\n}\n```\n"},"comment":{"url":"https://api.github.com/repos/StrikeNP/trac_test/issues/comments/394017263","html_url":"https://github.com/StrikeNP/trac_test/issues/867#issuecomment-394017263","issue_url":"https://api.github.com/repos/StrikeNP/trac_test/issues/867","id":394017263,"node_id":"MDEyOklzc3VlQ29tbWVudDM5NDAxNzI2Mw==","user":{"login":"StrikeNP","id":2577059,"node_id":"MDQ6VXNlcjI1NzcwNTk=","avatar_url":"https://avatars0.githubusercontent.com/u/2577059?v=4","gravatar_id":"","url":"https://api.github.com/users/StrikeNP","html_url":"https://github.com/StrikeNP","followers_url":"https://api.github.com/users/StrikeNP/followers","following_url":"https://api.github.com/users/StrikeNP/following{/other_user}","gists_url":"https://api.github.com/users/StrikeNP/gists{/gist_id}","starred_url":"https://api.github.com/users/StrikeNP/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/StrikeNP/subscriptions","organizations_url":"https://api.github.com/users/StrikeNP/orgs","repos_url":"https://api.github.com/users/StrikeNP/repos","events_url":"https://api.github.com/users/StrikeNP/events{/privacy}","received_events_url":"https://api.github.com/users/StrikeNP/received_events","type":"User","site_admin":false},"created_at":"2018-06-01T21:44:09Z","updated_at":"2018-06-01T21:44:09Z","author_association":"OWNER","body":"Trac update at 20090512T13:54:03: \n* vlarson@uwm.edu commented:\n\n> Replying to [comment:8 vlarson@…]:\n> > Replying to [comment:7 dschanen@…]:\n> > \n> > > I re-ran the LES SAM standalone simulation at a 2 sec. timestep and the crash appears to be similar to the SAM_CLUBB run . . .\n> > \n> > This is interesting, because perhaps the problem has nothing to do with CLUBB, and perhaps Marat might be willing to investigate.  Is it worth running this case using the latest tagged version of SAM as a sanity check, then preparing a plot of u field as in the above attachment?  If the plot looks as before, perhaps you could email the plot, your prm file, and a brief description of the problem to Marat?  (Please cc: me.)  Perhaps you could gently ask Marat if he is able reproduce the problem?\n> > \n> \n> Another thought: if you verify that the problem exists in vanilla SAM at 16-km horz grid spacing, is it worth testing whether the problem exists w/ 4-km grid spacing and 16 grid columns?  The point would be that Marat might become more interested in the problem if it's shown to occur in a model configuration that he might use someday.\n\n\n* vlarson@uwm.edu changed keywords from \"\" to \"ARM9707, arm_97, SAM_CLUBB, crash, horizontal winds\""}}
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