Fluid_Aspect_Course_4_3

Fluid Aspect Course 4.3: Layout Do’s & Dont’s

Do’s:

• (Reminder:) Minimize nodes
• (Reminder:) Read the link help pages for advice
• (Reminder:) Combine series conductors
  • Pipes are usually not needed — most pressure losses are in valves & devices, not pipes
  • Pumps/fans & valves’ conductance can include nearby ducting, filters
  • Most conductive links can also do forced convection (you’ll see related config data) so you don’t always need dedicated links for HX, coldplates — sometimes you can borrow the nearby valves, etc.

• Minimize fluid types
• Add utility spotters:
  • A GunnsFluidIslandAnalyzer if you’re using islands
• Add spare links
  • I like to add 2 spare GunnsFluidSource and 2 GunnsFluidPotential.
  • They can be used for tuning, creating flows due to flow source, potential source or conductance as needed.
• Use capacitances on nodes to help conserve mass & energy
  • Tanks & accums are obvious but line/duct volumes? These can be significant and not modeling any of it can cause errors.
• Use separate nodes for gas & liquid phases
• Use sensor links to get data for sensors
• Provide flex volume for liquids (accum)
• Orient conductors in (arrow) direction of normal flow
• Keep all conductor’s mMaxConductivity term within 10 orders of magnitude of each other to reduce truncation & rounding errors when they combine in the network solution.
• Tune network before interfacing

Dont’s:

• Mix phase in a node
• Use basic links (electric or thermal stencil)
• Use fluid source with nowhere to go
• Use liquids without flex volume
• Add heat sources without flow
• Put more than one capacitive link on a node
• Interface sim bus or displays directly to nodes, go thru links or spotters instead

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