1. PURPOSE / DESCRIPTION

To set a standard procedure for NX Drone and other subjects to prepare a mesh for a headwind wind tunnel simulation in ANSYS Fluent
Useful resources:
- ANSYS Customer Portal and full course videos on Fluent and Meshing
- “Workshop 07b: Auto Ext Aero” from ANSYS Meshing 16.0 full course materials
- “Workshop 04: Airfoil” from ANSYS Fluent 16.0 full course materials
- Workshops from full course for Design Modeler on ANSYS Customer Portal

2. PROCEDURE

ANSYS Workbench
- Drag and drop Fluid Flow (Fluent) system under Analysis Systems to create a standalone Fluent system.
- Double click on Geometry cell to open Design Modeler.

ANSYS Design Modeler
- File > Import External Geometry File… > find the CAD model file
  - Generate (F5)
  - Make sure that the generated object is not a surface but rather a body (if it is a surface, choose a different CAD version)
  - Double click on imported body and name it Drone.
- Check that the geometry of the model is moderately clean. If not, subject-specific cleanup in DM may be necessary (use learning resources), or the CAD model should be sent back to the designer to simplify geometry. The judgment should be based on Meshing and CFD courses.
- (Optional) Create > Body Transformation > Rotate
  - Preserve Bodies? = No
  - Bodies = select Drone
  - Axis Selection = choose appropriate axis
    - Selecting one of the planes in Outlines will show the corresponding axes of that plane.
    - Choose the desired axis on the Model View window and click Apply.
  - Angle = desired angle of rotations
  - Generate (F5)
- Tools > Enclosure
  - Shape = Box
  - Determine appropriate dimensions of enclosure depending on the dimensions of the geometry. You can use the diagram below to have applicable dimensions for external flow domain.
  - Merge Parts? = No
  - Body = Tunnel
  - Generate (F5)

Create > Boolean
- Operation = Subtract
- Target Bodies = select first enclosure
- Tool Bodies = select Drone
- Preserve Tool Bodies? = Yes
- Generate (F5)
RMB test subject in outline > Suppress Body
Create > Primitives > Box
- Dimension the box so that it encloses Drone tightly (up to about 10% cushion) as seen in the example shown below.
- Fluid/Solid = Solid
- Generate (F5)
Close Design Modeler
Double click on Mesh cell to open Meshing

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