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Old   February 17, 2015, 11:38
Default Analysis of a Model Aircraft
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Fergus
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Hi.

Newbie post. My project involves a CFD analysis of a model aircraft. I have generated the model in SolidWorks by using 3 view drawings and have been able to import the geometry into Fluent and then created a box in ANSYS geometry editor and berformed the boolean operations. For an idea of size the model of the aircraft has about a 200mm wingspan and the enclosure box representing the wind tunnel is 460mmX460mm square. I am currently having problems generating a mesh in the model. Below are my current settings.

Physics Preference: CFD
Solver Preference: Fluent
Relevance:0

Sizing
Use Advanced Size Function: On:Proximity
Relevance Center: Coarse
Initial Size Seed: Active Assembly
Smoothing: Medium
Transition: Slow
Span Angle Center: Medium
Proximity Accuracy:0
Num Cells Across Gap: Default (0)
Proximity Min Size: 2mm
Max Face Size: 5mm
Max Size: 10mm
Growth Rate: Default
Minimum Edge Length 1.7556e-002 mm

Inflation
Use Automatic Inflation: All Faces In Chosen Named Selection
Named Selection: Bugatti100 (Aircraft I have modelled)
Inflation Option: Smooth Transition
Transition Ratio: 0.272
Maximum Layers: 3
Growth Rate: 1
Inflation Algorithm: Pre

Assembly Meshing
Method: None

Patch Conforming Options
Triangle Surface Mesher: Program Controlled

Advanced
Shape Checking: CFD
Element Midside Nodes: Dropped
Straight Sided Elements: [Blank]
Number of Retries: 0
Extra Retries for Assembly: Yes
Rigid Body Behaviour: Dimensionally Reduced
Mesh Morphing: Disabled

Defeaturing
Pinch Tolerance: Default (1.8mm)
Generate Pinch on Refresh: No
Automatic Mesh Based on Defeaturing: On
Defeaturing Tolerance: Default (1mm)

Statistics:
Nodes: 628473
Elements: 3430625

The error message I currently get is:-
Inflation Created Stairstep Mesh at Some Locations

Any help on refining my settings to obtain a mesh that is suitable for analysis is much appreciated.
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