The Capabilities and Limitations of Flow Simulation
One of the grey areas of Simulation swirl around the SolidWorks Flow Simulation product-line, where the capabilities and limitations are critical to ensure successful implementation. Earlier this week, we had a potential customer inquire into the functional capabilities of Flow Simulation.
Flow Simulation is an excellent mid-range fluid flow product if you are trying to simulate anything from liquids to gas flow. It can be utilized in a wide range of applications from electronics to valves to HVAC to medical and automotive/aerospace applications, and also where fluid flow coupled with thermal analysis is a requirement.
Below is a compiled list of the capabilities and limitations of the SOLIDWORKS Flow Simulation productline as of 2009:
What Flow Simulation can do
- Incompressible (liquid or gas) or compressible (gas) viscous flow including subsonic, transonic and supersonic regimes
- External and/or internal flows
- Non-Newtonian Flows (Viscous fluids such as blood)
- Automatic laminar/turbulent solution with transition
- Wall roughness model
- Swirling flows and fans (fan curves)
- One component or up to ten independent species -liquid-liquid mixing, or gas-gas mixing
- Forced, free or mixed convection – heat transfer
- Conjugated heat transfer (fluid, solid), conduction and convection
- Porous Media
- Steady state and Transient (time-dependent) fluid flow
- Rotating Frames of Reference
- TEC coolers/heat sink emulators/Thermostats
- Relative Humidity
What Flow Simulation cannot do
- Phase Change – The Flow package cannot handle materials cooling and transforming from gas-to-liquid, or molten liquid-to-solid. Similarly, it cannot handle materials heating from molten solid-to-liquid, or liquid-to-gas. This requires special high-end non-linear and complex formulations specifically for modeling entropy and chemical/molecular changes to account for cool down etc. Eg: plastic flow throw an injection mold as it cools and solidifies.
- Co-existence of different phases – Flow Simulation cannot simulate a liquid and a gas in the same cavity. For instance, water flowing out of a nozzle into air (since water and air exist in the same cavity after the water flows out). Similarly, sprays (where fluid bubbles are sprayed into air). Different fluids (liquids/gases) can co-exist in a Flow Simulation if they exist in different cavities or volumes.
- Free Surface Phenomena – Flow Simulation cannot simulate the top layer of a liquid sitting in an open tank. This again requires highly non-linear and complex formulae that are characteristic of high-end packages.
- Moving bodies – Flow Simulation cannot simulate bodies moving and displacing fluids as they move. This requires special high-end focused packages that can handle Fluid-Structure-Interaction (FSI).
- Combustion – Flow Simulation cannot perform chemical reactions to account for combustion.
- Particles/Suspensions – Flow Simulation cannot simulate solid/liquid suspensions in a fluid where the suspensions can influence the pattern/parameters of flow. Since Flow Simulation cannot have two different phases in the same volume, it does not support solid particles in a fluid stream/liquid particles in a fluid stream/gas trapped in a liquid stream etc.