# Ansys CFX 14.5 + trasnient "initialize profile data"

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 June 27, 2013, 11:00 Ansys CFX 14.5 + trasnient "initialize profile data" #1 Member   don lenardo Join Date: Nov 2010 Posts: 75 Rep Power: 8 Hello, one quastion about "initialize profile data" in combination with Ansys CFX 14.5. Is it possible to use/change the rotational speed of a domain from "outside" by a set of profile data??Or is there another possibility to change the rotational speed automatically during a transient calculation? I also want to change the massflow rate too but this should be quite easy by a profile data. Example of my planned transient calculation: t = 0 - 5s: n = 2rpm, massFlow rate= 1kg/s t = 5 - 10s: n = 1rpm, massFlow rate = 0.5kg/s t = 10 -15s: n = 1.5rpm, massFlow rate = 0.7kg/s Maybe someone can help me with my problem! Thank you in advance!! //Markus

 June 27, 2013, 11:26 #2 Senior Member   Edmund Singer P.E. Join Date: Aug 2010 Location: Minneapolis, MN Posts: 512 Rep Power: 13 Use CEL. Look into either step function or if function.

 June 28, 2013, 04:14 #3 Member   don lenardo Join Date: Nov 2010 Posts: 75 Rep Power: 8 Thank you very much for your support, but unforunately I cannot find the step function for rotational speed and massFlow (correlation between those two parameters) depending on a number of time steps . Therefore, it would be very nice, iy you can give me more explicit information (description, manual, tutorial, ...) or an short example of changing the rotational speed and massFlow depending on a number of time steps?? Example of my planned transient calculation: time steps = 0 - 500: n = 2rpm, massFlow rate= 1kg/s timesteps = 501 - 1000: n = 1rpm, massFlow rate = 0.5kg/s timesteps = 1001 -1500: n = 1.5rpm, massFlow rate = 0.7kg/s So the rotational speed and massFlow rate should be constant for a specific time steps period. Therefore, I want to load a list of values into CFX-Pre. But if this is also possible with using the step-function, it would be more elegant. Thank you in advance. //Markus

 June 28, 2013, 06:46 #4 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 13,535 Rep Power: 104 The syntax of "if" statements is quite simple. It is simple to implement your function this way. Have a look at the tutorials which come with CFX form examples of if and step functions. Alternately you could use a 1D interpolation file. Again, they are demonstrated in the tutorials.

 June 28, 2013, 07:15 #5 Member   don lenardo Join Date: Nov 2010 Posts: 75 Rep Power: 8 I got it! Thank you. This thread can be closed. //Markus

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