{"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":19,"created_at":"2018-06-01T21:24:08Z","updated_at":"2018-06-01T21:44:39Z","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/394017365","html_url":"https://github.com/StrikeNP/trac_test/issues/867#issuecomment-394017365","issue_url":"https://api.github.com/repos/StrikeNP/trac_test/issues/867","id":394017365,"node_id":"MDEyOklzc3VlQ29tbWVudDM5NDAxNzM2NQ==","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":"2018-06-01T21:44:39Z","updated_at":"2018-06-01T21:44:39Z","author_association":"OWNER","body":"Trac update at 20090519T12:01:58: vlarson@uwm.edu commented:\n\n> Replying to [comment:17 dschanen@…]:\n> > Replying to [comment:13 vlarson@…]:\n> > > \n> > > If you run ARM9707 using SAM_CLUBB in CEM mode (say 4 columns at 16-km horz grid spacing and 128 vertical grid points), then does the simulation crash?\n> > The simulation runs to completion, i.e for all of period A.  This seems to be consistent with our hypothesis that this is a SAM / LES mode / diag_ustar problem, and not a CLUBB problem.\n> Thanks for running ARM9707 in CEM mode.  Could you please go through the code and make sure that all cases with coarse (> 1 km) grid spacing use CEM mode by default, both for manual simulations and nightly tests simulations?  Thanks so much.\n\n"}}
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