{"action":"created","issue":{"url":"https://api.github.com/repos/tbeu/Modelica/issues/779","repository_url":"https://api.github.com/repos/tbeu/Modelica","labels_url":"https://api.github.com/repos/tbeu/Modelica/issues/779/labels{/name}","comments_url":"https://api.github.com/repos/tbeu/Modelica/issues/779/comments","events_url":"https://api.github.com/repos/tbeu/Modelica/issues/779/events","html_url":"https://github.com/tbeu/Modelica/issues/779","id":197039662,"number":779,"title":"SIunits type for generic nondimensional ratio is 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release.","creator":{"login":"modelica-trac-importer","id":22202507,"avatar_url":"https://avatars.githubusercontent.com/u/22202507?v=3","gravatar_id":"","url":"https://api.github.com/users/modelica-trac-importer","html_url":"https://github.com/modelica-trac-importer","followers_url":"https://api.github.com/users/modelica-trac-importer/followers","following_url":"https://api.github.com/users/modelica-trac-importer/following{/other_user}","gists_url":"https://api.github.com/users/modelica-trac-importer/gists{/gist_id}","starred_url":"https://api.github.com/users/modelica-trac-importer/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/modelica-trac-importer/subscriptions","organizations_url":"https://api.github.com/users/modelica-trac-importer/orgs","repos_url":"https://api.github.com/users/modelica-trac-importer/repos","events_url":"https://api.github.com/users/modelica-trac-importer/events{/privacy}","received_events_url":"https://api.github.com/users/modelica-trac-importer/received_events","type":"User","site_admin":false},"open_issues":1,"closed_issues":107,"state":"closed","created_at":"2016-12-21T08:16:13Z","updated_at":"2016-12-21T21:43:09Z","due_on":"2013-03-31T07:00:00Z","closed_at":"2016-12-21T08:16:13Z"},"comments":7,"created_at":"2016-12-21T21:41:49Z","updated_at":"2016-12-21T21:44:10Z","closed_at":null,"body":"**Reported by fcasella on 17 Jul 2012 21:02 UTC**\nConsider the following model\n```\nSI.ThermalConductivity G;\nSI.Temperature T1,T2;\nSI.Power Q;\nReal Ff \"Fouling factor\";\nequation\nQ = Ff*G; // Wrong, should be Q = Ff*G*(T1-T2)\n```\n\nThe fouling factor is a nondimensional ratio; however, if I declare it as Real, it will be considered by the unit checking algorithm as having the dimensions of Temperature, in order to make the equation dimensionally correct, so the error will not be spotted. The intended behaviour is instead obtained by declaring \n```\nReal Ff(unit = \"1) \"Fouling factor\";\n```\nwhereupon the unit checker will complain that the equation is dimensionally inconsistent.\n\nIt would be nice to have such a type defined in Modelica.SIunits as\n\n```\ntype NonDimensionalRatio = Real(unit = \"1\");\n```\n\nThere are in fact many such types in the package (e.g. for various non-dimensional numbers such as Reynolds number, Mach number etc.), but a generic nondimensional type is missing.\n\n\n\n\n\n\n----\n\nMigrated-From: https://trac.modelica.org/Modelica/ticket/779"},"comment":{"url":"https://api.github.com/repos/tbeu/Modelica/issues/comments/268648731","html_url":"https://github.com/tbeu/Modelica/issues/779#issuecomment-268648731","issue_url":"https://api.github.com/repos/tbeu/Modelica/issues/779","id":268648731,"user":{"login":"modelica-trac-importer","id":22202507,"avatar_url":"https://avatars.githubusercontent.com/u/22202507?v=3","gravatar_id":"","url":"https://api.github.com/users/modelica-trac-importer","html_url":"https://github.com/modelica-trac-importer","followers_url":"https://api.github.com/users/modelica-trac-importer/followers","following_url":"https://api.github.com/users/modelica-trac-importer/following{/other_user}","gists_url":"https://api.github.com/users/modelica-trac-importer/gists{/gist_id}","starred_url":"https://api.github.com/users/modelica-trac-importer/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/modelica-trac-importer/subscriptions","organizations_url":"https://api.github.com/users/modelica-trac-importer/orgs","repos_url":"https://api.github.com/users/modelica-trac-importer/repos","events_url":"https://api.github.com/users/modelica-trac-importer/events{/privacy}","received_events_url":"https://api.github.com/users/modelica-trac-importer/received_events","type":"User","site_admin":false},"created_at":"2016-12-21T21:44:10Z","updated_at":"2016-12-21T21:44:10Z","body":"**Comment by dietmarw on 14 May 2013 09:18 UTC**\nOK the enhancement request of comment:4 is handled in #1097. Which means this ticket can be closed now."}}
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