![]() Use the Geometry tools in Simulation CFD to Generate the Flow Model Some larger assemblies may have gaps that are difficult to detect and which may prevent correct creation of the fluid volume.If you suppress it, be sure to apply boundary conditions correctly to the generated flow region. For external flows, you can include the box as part of the flow or exclude it by suppressing it.Caps are additional parts in your CAD model, and must be saved with the other CAD model files.Create thicker caps to move the boundary condition further upstream from the object use thinner caps to move the boundary condition closer. You can vary the thickness of the caps to control the location of your boundary conditions. Cap volumes created in CAD are used as part of the flow region.The exact shape of the flow geometry is captured and interferences are not an issue.This method is generally simple to perform.This causes Autodesk Simulation CFD to create a flow volume between the box and the model. They ensure the void is "air tight" so Simulation CFD can create the flow volume.įor external flows such as over a vehicle or around an exposed module, enclose the model with a box. ![]() These are included only in the design study, not in the CAD model.įor internal flows such as pipes, valves, and electronic enclosures, create "caps" to cover the openings. Fill small gaps in the flow region that are not important.Įnsure the void is airtight, and Simulation CFD creates the flow partĪutodesk Simulation CFD automatically creates parts to fill any void space in a model.Eliminate very small features that do not affect the analysis results.Examples include press-fits and improper mates. Reduce very large assemblies to include only vital components.Eliminate fasteners that do not impact flow or heat transfer.These include clearances between parts, sheet metal reliefs, and fastener holes. Eliminate gaps that prevent void filling.Steps you should always take to prepare the geometry: In some cases, it is faster to create a new, simpler version of your design to focus on the key areas of study.This can accelerate the analysis process. For large assemblies, consider analyzing only critical portions of the design.To save time and computer resources, eliminate these features if they are too small to affect the results of the simulation. ![]()
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