5 Replies Latest reply on Feb 10, 2015 6:05 AM by Simone Storace

Flow simulation, outlet pressure(boundary condition) dependent on a user defined surface goal?

Adam Staszak Feb 4, 2015 4:26 PM

I'm running a flow simulation on proportioner, what i have is a known inlet pressure that I want it to run at, I have a surface goal of force in one direction on a plunger that is in the proportioner that i want to make a known value. What would be unknown is pressure on the outlet and flow. I have been able to solve it for few plunger positions by verying the outlet pressure based until i hit my surface goal that i'm looking for. My question is there a way to say I want my goal to be say 100lbf and have the outlet pressure dependent on metting that surface goal.

Re: Flow simulation, outlet pressure(boundary condition) dependent on a user defined surface goal?

Bill McEachern Feb 4, 2015 4:56 PM (in response to Adam Staszak)

The short answer is no. However, you can have the software search the conditions for you to get the flow and pressure that produces the goal you want. Look under solve on the tool bar and select parametric study.
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- Re: Flow simulation, outlet pressure(boundary condition) dependent on a user defined surface goal?
  
  Adam Staszak Feb 4, 2015 5:42 PM (in response to Bill McEachern)
  
  If i do that, do i have to do a range of outlet pressures? and then have it solve for all of them? (that's what i was doing) or can i have it run one simulation to find that oulet pressure that meets my goal?
  
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  - Re: Flow simulation, outlet pressure(boundary condition) dependent on a user defined surface goal?
    
    Jared Conway Feb 6, 2015 7:46 PM (in response to Adam Staszak)
    
    parametric optimization lets you set a goal to search for and a dimension/flow parameter to change
    
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    - Re: Flow simulation, outlet pressure(boundary condition) dependent on a user defined surface goal?
      
      Adam Staszak Feb 9, 2015 9:24 AM (in response to Jared Conway)
      
      Okay, how do i go about doing that?
      
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      - Re: Flow simulation, outlet pressure(boundary condition) dependent on a user defined surface goal?
        
        Simone Storace Feb 10, 2015 6:05 AM (in response to Adam Staszak)
        
        Hi Adam,
        I'll try to explain.
        First, set your boundary conditions as pressure inlet and pressure outlet (choose a attempt value for the last one).
        - Go to Flow Simulation -> Solve -> New parametric study.
        - On the new window left, choose "Goal optimization" instead "What if" (the symbol of goal optimization is a sort of bull's eye).
        - Now you have to set in "input variables" the boundary condition that you want to modify (in this case the outlet pressure) and insert a reasonable range.
        Obviously, nearest the range to real value is, faster the study finish.
        - In output parameter insert your surface goal with the target value and the relative tolerance.
        - Go to "scenario" and click RUN.
        Flow simulation solve the first two calculation with the two value of the pressure outlet range and after choose others pressure outlet values according to your goal target.
        For example:
        Range: 1 - 10 psi outlet pressure
        Target: 100lbf with tolerance 1lbf
        Run 1 -> 1psi -> goal is 230lbf
        Run 2 -> 10 psi -> goal is 95lbf
        Now Flow Sim choose a new value
        Run 3 -> 8 psi and goal is 110
        Run 4 -> 9 psi and gol is 99.5 --> Target is ok, the simulation is finish.
        
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