Downward flow control problems

Question

Hey Guys,
          I'm trying to understand the WL documentatino on controlling flow
          (downwards) in WL7.
          Imagine I have flow max of 700 and flow min of 100 and step of 6 and
          interval of 60.
          For upwards, I understand it to be linear - just divide difference between
          flow max and flow min by the step value. So what will happen is that it
          will check every *6* seconds, and if it's to move up it will add a constant
          (700-100)/ 6 = 100 everytime. ie. if we are at 100 it will go to 200. If
          at 200 it will go to 300 and so on.
          For the downward, geometric move, the documentation says "taking the nth
          root of the difference, where n is the number of steps". Does difference
          here mean the static difference between max and min? I imagine so, in which
          case it will be 600 Then they are saying move down by
          the 6th root of 600 (3!!), then the 5th root of 600(9!!) etc.
          In which case if we are at 700 and after *6* second we see we need to move
          down, we move down to 697 and after another *6* seconds we see we need to
          move down we move down to 686 (9 diff) etc.
          Is this a correct interpretation?
          Thanks
          Q
          

Answer 1

          For what the docs say I think your interpertation is right.
          What is really happens is this
          double flowDecrease = (double)flowMinimum/(double)flowMaximum;
          flowDecrease = Math.pow(flowDecrease, 1.0/(double) flowSteps);
          John
          DRE BEA Technical Support