Comments

• [Deleted User]

  December 2015

  victor is the developer of mecway and will have the best answer. but i know that he has cleaned up the code base a lot. removing things that were in error or not used enough to be worth updating.
• waluyo

  December 2015

  I used flow-pipe network analysis, and as far as I know, no errors, last time in LISA 7. I can get the same results with the finite element textbook having the flow-pipe network topic. That analysis is very useful. I hope Mecway can support this analysis.
• Victor

  December 2015

  It's like prop_design said. This was a relatively low value feature. It tended to mislead people who expected it to be practical for modelling actual pipe networks but it had big shortcomings like:
  
  It ignores the Bernoulli principle which might be significant at diameter changes or intersections.
  No convenient lumped elements like bends (extra losses) and pumps.
  No provision for entrance regions – flow is assumed to be fully developed everywhere.
  No gravity.
  
  
  Since the Hagen-Poisueille law is analogous to Ohm's law, you could use electrical resistor elements instead:
  
  Hagen-Poisueille: ΔP = 32μ * L/d² * v
  
  Ohm's law: ΔV = 4ρ/π * L/d² * I
  
  So if I've got my maths right, you can pretend:
  I = v
  V = P
  ρ = 8πμ
  
  where μ is dynamic viscosity and v is average velocity.
  
• Victor

  December 2015

  Also there may have been an error with the tapered pipe element. It was internally converted to a straight pipe with the same average diameter, though I think it should have had the same average cross-sectional area instead.