{"id":53379,"date":"2021-03-15T11:09:02","date_gmt":"2021-03-15T11:09:02","guid":{"rendered":"\/forum\/forums\/topic\/time-varying-boundary-condition-in-fluent\/"},"modified":"2021-03-15T11:09:02","modified_gmt":"2021-03-15T11:09:02","slug":"time-varying-boundary-condition-in-fluent","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/time-varying-boundary-condition-in-fluent\/","title":{"rendered":"Time varying boundary condition in Fluent"},"content":{"rendered":"<p>Hello,I am trying to simulate time varying boundary condition where after some time one of my wall should be changed as mass flow inlet with a certain amount of mass flow rate value. I went through the discussions on this forum and many other internet resources and even fluent documentation. Implementing UDF or using scheme file are the options one can use to define this time varying boundary condition was my conclusion. UDF needs strong programming skills and scheme documentation is rarely available.nI want to try scheme file for my simulation. I want to know how can we input other details of my changing boundary condition in the scheme file. Suppose my scheme file is:nn<i>(cond<\/i>n<i>\u00a0\u00a0\u00a0((> (rpgetvar &#8216;flow-time) 2.0)<\/i>n<i>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0(ti-menu-load-string define\/boundary-conditions\/zone-type 6 wall)<\/i>n<i>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0(ti-menu-load-string define\/boundary-conditions wall 6 no no yes yes no 1 no 0)<\/i>n<i>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0(ti-menu-load-string define\/boundary-conditions\/zone-type 6 mass flow-inlet)<\/i>n<i>\u00a0\u00a0\u00a0)<\/i>n)nSo now for this wall I want it to change to mass flow inlet after 2 secs in my simulation and I want to specify its details within this scheme file befoe the run (flow direction specification method\/value of mass flow rate, etc.).nHow can I do it?nPlease help.nThank you.n<\/p>\n","protected":false},"template":"","class_list":["post-53379","topic","type-topic","status-closed","hentry","topic-tag-transient-analysis"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"Hello,I am trying to simulate time varying boundary condition where after some time one of my wall should be changed as mass flow inlet with a certain amount of mass flow rate value. 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