Working with OpenModelica

• OpenModelica 1.9.1:
  • open source
  • simple graphical editor
  • Modelica engine reliable in many applications
  • good support of the MFL
• Simple tests:
  • Tank, Pipe work
  • CurveMFL gives undefined values
  • Curve works
    • computes pressure difference from mass flow
    • assumes fixed density and viscosity
    • almost identical simulation results (in Dymola)
• TeeBranches:
  • Models based on FluidDissipation library → error while flattening the equations
  • simplified TeeBranch1 works
  • TeeBranch1C (adds a little compressibility) → wild results
  • basic TeeBranch works
• Complete systems:
  • initial version (100 components, 10000 equations) → Modelica compiler crashes early
  • stable at around 6000 equations
  • slightly reduced model could be used successfully