how can i input a time variable input condition

- September 5, 2018 at 11:29 am
  
  alain.benchissou
  Subscriber
  
  Hi
  
  I know it is possible but am new with DIscovery Ultimate
  
  for a fluid transient analysis,
  
  i would like to be able to input a pressure on which the magnitude would be a function of time (for example at the beginning the pressure is maximum, at the end of the end time of analyse, the value goes down to Oà.
  
  thanks for your help
- September 5, 2018 at 12:39 pm
  
  Gaurav Sharma
  Subscriber
  
  Hi benalain
  It is possible to write pressure as an expression of time in Discovery AIM but this is not possible with Discovery Live. I believe your problem is concerned with AIM.
  You just have to start writing an expression under the pressure tab and as you write “Time”, program recognizes this as standard analysis time:
  In the example below, I have written an expression such that pressure drops down to 0MPa at T = 100 seconds and stays at zero even if the analysis proceeds further. Please note the use of conditional statement and rectangular brackets are used to specify units in order to ensure dimensional accuracy.
  I hope this helps.
  Thanks & Regards,
  Gaurav
- September 5, 2018 at 12:55 pm
  
  alain.benchissou
  Subscriber
  
  You are right, it is for AIM
  
  thanks, i will test this
  
  is it possible to multiply the pressure by a function i would describe later? (we use to do this traditionnaly in FEA codes)...
  - September 5, 2018 at 1:01 pm
    
    Gaurav Sharma
    Subscriber
    
    benalain
    
    I guess any function of time should not be a problem. I may provide more precise information if you can please elaborate on what kind of a function you are trying to have.
- September 5, 2018 at 1:23 pm
  
  alain.benchissou
  Subscriber
  
  any function for example a linear one with an expression like : 100 x TIme + 50 ..
- September 5, 2018 at 2:02 pm
  
  alain.benchissou
  Subscriber
  
  i wrote as you suggested ; it seems to be OK ; indeed there is a value disaplyed corresponding at the initial time.
  Is there any way to plot the function i defined?
  - September 6, 2018 at 6:06 am
    
    Gaurav Sharma
    Subscriber
    
    benalain
    Yes there is. You can see a small arrow right next to the function defined. Click on it and it will popup chart option for you as shown below:
    Regards,
    Gaurav
  - September 6, 2018 at 5:49 pm
    
    alain.benchissou
    Subscriber
    
    Gaurav_ANSYS
    
    Thansks for that
    
    hi, are using version 19.1 or 19.2?
- September 7, 2018 at 6:35 am
  
  Gaurav Sharma
  Subscriber
  
  The snapshots I shared with you are from 19.1.
  
  Regards,
  
  Gaurav

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