3. Geometry & Meshing PROCEDURE (with inflation layer definition)

NOTE: These instructions match the video on SimCafe’s webpage: https://goo.gl/A7aQHD

• For this procedure it is recommended that you have a coordinate file with a trailing edge that you have to connect using a separate line, as in the tutorial http://pjotr.ru/ansys_dm_01/
• Use the same geometry made with the instructions from SimCafe but without the line projections.
  • The geometry should look similar to this:
• Open Meshing and change the settings of Mesh to match the settings below (except for Statistics):

• SETTINGS (especially Min Size) SHOULD BE ALTERED, TESTED, AND EXPERIMENTED WITH DEPENDING ON THE GEOMETRY.
• The statistics should be checked, as mentioned, each time the mesh generated.
• For 2D mesh, an orthogonal quality (OQ) above 0.4 is preferred, but using inflation will most likely result in lower OQ, which is acceptable.

• RCLK on Mesh > Insert > Sizing

Scoping	Scoping Method	Geometry Selection
	Geometry	Select the main edge of the airfoil. (excluding the trailing edge)
Definition	Type	Number of Divisions You can also use Element Size.
	Number of Divisions	900 Adjust number of divisions as needed.
	Behavior	Soft
	Bias Type	_____  ___  _  ___  _____ This is to have smaller sizing near the trailing edge in order to improve orthogonal quality. Adjust according to the geometry.
	Bias Option	Bias Factor
	Bias Factor	35 Adjust bias factor as needed.

• RCLK on Mesh > Insert > Sizing

Scoping	Scoping Method	Geometry Selection
	Geometry	Select the trailing edge of the airfoil.
Definition	Type	Number of Divisions Or you can use Element Size and use a size that is about half the height of the trailing edge.
	Number of Divisions	2
	Behavior	Hard
	Bias Type	No Bias

• RCLK on Mesh > Insert > Inflation

Scoping	Scoping Method	Geometry Selection
	Geometry	Select the main surface (do not select it as a body)
Definition	Boundary Scoping Method	Geometry Selection
	Boundary	Select the main edge (excluding the trailing edge) of the airfoil
	Inflation Option	First Layer Thickness Choose appropriate option depending on the situation.
	First Layer Height	.1 mm This was the desired first cell height calculated for an Re of 3000000. Calculate and use an appropriate height, or use another method.
	Maximum Layers	20

• (Optional)
  • RCLK on Coordinate Systems > Insert > Coordinate System

Origin	Define By	Global Coordinates
	Origin X	1500 mm Select appropriate coordinates so that the sphere of influence is slightly to the right of the trailing edge.
	Origin Y	0
	Origin Z	0

• Mesh > Insert > Body Sizing

Scoping	Scoping Method	Geometry Selection
	Geometry	Select the main body (do not select it as a surface)
Definition	Type	Sphere of Influence
	Sphere Center	Coordinate System Or select the coordinate system created in the step above.
	Sphere Radius	2000 mm This can be altered as needed.
	Element Size	40 mm This can be altered as needed. You can change this to do mesh independence study as well.

• Creating Named Selections
  • Select the edges that form the airfoil
    • RCLK on the graphics window > Create Named Selections
    • Name it “wing”
  • Do the same for the edges for the inlet and outlet as shown:

Example of how it should look: