{"action":"opened","issue":{"url":"https://api.github.com/repos/StrikeNP/trac_test/issues/147","repository_url":"https://api.github.com/repos/StrikeNP/trac_test","labels_url":"https://api.github.com/repos/StrikeNP/trac_test/issues/147/labels{/name}","comments_url":"https://api.github.com/repos/StrikeNP/trac_test/issues/147/comments","events_url":"https://api.github.com/repos/StrikeNP/trac_test/issues/147/events","html_url":"https://github.com/StrikeNP/trac_test/issues/147","id":334601690,"node_id":"MDU6SXNzdWUzMzQ2MDE2OTA=","number":147,"title":"TWP-ICE: Troubleshoot Morrison microphysics at long timesteps (Trac #147)","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":[],"state":"open","locked":false,"assignee":null,"assignees":[],"milestone":{"url":"https://api.github.com/repos/StrikeNP/trac_test/milestones/6","html_url":"https://github.com/StrikeNP/trac_test/milestone/6","labels_url":"https://api.github.com/repos/StrikeNP/trac_test/milestones/6/labels","id":3442836,"node_id":"MDk6TWlsZXN0b25lMzQ0MjgzNg==","number":6,"title":"Set up CLUBB for the TWP-ICE intercomparison","description":null,"creator":{"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},"open_issues":14,"closed_issues":0,"state":"open","created_at":"2018-06-21T18:02:17Z","updated_at":"2018-06-21T18:11:34Z","due_on":null,"closed_at":null},"comments":0,"created_at":"2018-06-21T18:11:34Z","updated_at":"2018-06-21T18:11:34Z","closed_at":null,"author_association":"OWNER","body":"Migrated from http://carson.math.uwm.edu/trac/clubb/ticket/147\n```json\n{\n    \"status\": \"closed\", \n    \"changetime\": \"2012-02-14T19:37:03\", \n    \"description\": \"As of 29 Jul 2009, the TWP-ICE simulation looks good, but not all ensemble members can be run stably at a 5-min timestep.  The best-estimate ensemble member runs at a 5-min timestep, but not at a 10-min or longer timestep.\\n\\nOne thing limiting the timestep was bugs in the monotonic flux limiter (see tickets #86 and #111).  We have committed fixes for these bugs (see r3881, r3878, r3877, r3876).  However, we have yet to verify that mfl is staying within the envelope.\\n\\nHowever, another things that limits the timestep appears to be the Morrison microphysics (see e.g. comment:29:ticket:111 or comment:17:ticket:86).  Therefore, I suggest that we find cases in which TWP-ICE crashes, output to disk every timestep, and investigate the cause.  Possible causes are that 1) Morrison microphysics is being fed an unrealistically large amount of rtm or rcm; 2) cf is small and hence within-cloud quantities are unrealistically large; or 3) there is an intrinsic problem with the Morrison microphysics, e.g. the number of cloud droplets becomes too low.  \\n\\nSome specific questions to address: When TWP-ICE crashes, then\\n\\n1.  Does mfl stray outside the allowed envelope?\\n2.  Do spikes of rain appear, as seen previously?\\n3.  Is the rain budget balanced?\\n4.  If so, what terms generate the spikes of rain?\\n5.  Where a spike of rain occurs, is there a spike of rcm?  Is there a rcm spike during the previous timestep?\\n6.  Where a spike occurs, is cf low or high?\\n7.  Where a spike occurs, is Ncm large or small?  (Are we running with fixed Ncm?  If not, do the spike disappear when we use fixed Ncm?)\", \n    \"reporter\": \"vlarson@uwm.edu\", \n    \"cc\": \"bmg2@uwm.edu, dschanen@uwm.edu\", \n    \"resolution\": \"Verified by V. Larson\", \n    \"_ts\": \"1329248223000000\", \n    \"component\": \"clubb_src\", \n    \"summary\": \"TWP-ICE: Troubleshoot Morrison microphysics at long timesteps\", \n    \"priority\": \"major\", \n    \"keywords\": \"\", \n    \"time\": \"2009-07-29T13:53:19\", \n    \"milestone\": \"Set up CLUBB for the TWP-ICE intercomparison\", \n    \"owner\": \"vlarson@uwm.edu\", \n    \"type\": \"defect\"\n}\n```\n"}}
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