# How to assign the inlet B.C using a bunch of data set for an unsteady problem?

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 March 13, 2012, 23:51 How to assign the inlet B.C using a bunch of data set for an unsteady problem? #1 New Member   Ali Join Date: Dec 2011 Posts: 21 Rep Power: 13 Hello Guys, I'm going to assign a bunch of data set as an inlet boundary condition. The problem is, the inlet B.C changes with time. For example at t=t1, I have to read the first data set and for the next timestep I have to read the next data set. Note that the problem is unsteady and I have to assign the velocity (u and V components) to the inlet boundary condition at different time step. For a steady problem, I know how to do that. I just need to use the "initialize profile data", but for an unsteady problem, I do not know how I should tackle the problem. I would appreciate your help in advance. Thanks, Ali

 March 14, 2012, 03:49 #2 Senior Member   Lance Join Date: Mar 2009 Posts: 669 Rep Power: 21 Search the forum, it has been asked many times before. Or, have a look here: http://www.edr.no/blogg/ansys_blogge...nsient_profile

 March 21, 2012, 14:55 #3 New Member   Ali Join Date: Dec 2011 Posts: 21 Rep Power: 13 Thanks, Lance for your reply. So, it means that I do not need to write a code to assign the boundary condition.

 March 28, 2012, 19:41 #4 Member   Hesam Moghaddam Join Date: Mar 2012 Posts: 49 Rep Power: 13 Dear Ali and Lance, I input an excel data file using the link you gave. It is the curve for a pulsatile blood flow. I applied these data as my inlet B.C. Actually CFX doesn't show any plot or anything to make us sure that it is using the same curve? do you know a way to verify the shape of curve from the data I input in CFX? like when you enter an equation in expression part it gives a plot according to the formula you entered and you can see if it is taking the data in a good way or not? Thank you, Regards