We will go through how to analyze a design with Simulation CFD from beginning to end. We will start at the Inventor model and end at visualizing the results. In addition to seeing the actual workflow we will talk about how simulation tools can be used throughout the life of a design project, from early concept to final testing.
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How to Use Sim CFD (to your advantage): A Primer for Computational Fluid Dynamics
1. How to Use Sim CFD (to Your
Advantage)
- A Primer for Computational
Fluid Dynamics
Jim Swain Dave Graves
Synergis Autodesk
2. How to Use CFD
• When to apply simulation tools in a product development project.
• See a basic CFD workflow for consumer electronics cooling.
• Discuss basic CFD considerations for building design.
• See tools to prepare Inventor models for simulation.
We will be using Autodesk CFD 2016 and related products.
4. Channel Enablement Executive
for Autodesk
Simulation user:
Designer
Simulation Generalist
CFD Specialist
Dave Graves
5. When is simulation traditionally performed?
Completed design performance verification
Failure analysis
When to Apply Simulation Tools?
6. When can it save the most money???
Early in the concept phase!!!
Why?
Parts haven’t been spec’d, or ordered
Rough designs = less simplification time
Comparing concepts for relative improvements
Avoids “does it match our test lab results?”
When Should We Apply Simulation Tools?
18. Change to the Results tab
Probably will have to hide the
outer shell.
Don’t hide the working fluid!!!
Can start checking results right
after the first iteration is complete.
Analysis Results
19. Mechanical Ventilation
HVAC: Factories, Datacenters,
Hospital Rooms, Office Spaces,
Laboratories, Clean Rooms
Smoke Extraction
Chemical Spill Control
Thermal Comfort
Solar Loading
Condensation on Windows
Typical AEC Models Studied with Simulation CFD
External Flow
Wind Loading
Smoke/Exhaust
Flow control on
environment: Fences, walls,
courtyards
Natural Ventilation
Passive building comfort
studies
Large Atriums
Condensation
Internal/External
combinations
20. Sometimes it is better to start over!
Architectural drawings are overly complex for CFD Simulations
Start cleaning the geometry with the basic building geometry:
1. Open VG (Visual Graphics)
2. Turn off all layers
3. Turn on Walls, Floors, Roofs, Ceilings, Windows
4. Start your clean up there
5. Modify Geometry – Test Launch – Inspect Model – Test Mesh
Repeat 5 until geometry is satisfactory
Elements hidden from the active 3D view in Revit are not transferred into
Autodesk Simulation CFD.
Leveraging your Revit model in Simulation CFD
21. Model Complexity
Well-formed geometry with an appropriate level of detail is essential for an efficient AEC
simulation.
Architectural geometric models often include features that span a wide range of length scales.
Consider the effect and relevance of small geometric features on the overall simulation.
A detail item that is 1/8” long embedded in a 10,000 square foot interior space will require
mesh elements that are significantly smaller than the surrounding air volume. If the item is
included, the resulting model size is much larger due to the large element count, and run-
times are much longer as well.
• Remove or simplify small features on furniture or detailing.
• Either exclude or substitute features such as small diameter tubing, rounds, fillets, holes, handles, and
railings with a simpler representation.
Remove as necessary to
maintain simulation efficiency.
25. Diffusers
Sidewall Slot DiffusersCeiling Supply
Most diffusers are built from scratch
Build the model with volumes, don’t use surfaces!
Customer have to build their own libraries in Revit
27. Model Integrity
Inspect closely for interferences and small gaps.
The following techniques references Revit commands, but the strategy can be applied to any
CAD tool.
Ensure walls, floors, and ceilings meet cleanly. Avoid small overlaps or gaps.
• This prevents a high concentration of very small elements where these features meet.
• Causes meshing failure and poor results.
• To review details of the construction, use the Thin Lines view option.
• To ensure walls are cleanly lined up, use the Join and Align commands.
• Small interferences and gaps between structural elements (such columns and beams) and neighboring
geometry should also be considered
In the image, small interferences exist between structure and cladding around the outside of the
column and beams: