Using Blender to create solids for Gerris

From Gerris

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	==== Close the top and bottom parts of the mesh ====		==== Close the top and bottom parts of the mesh ====
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-	Switch to the side view
	<pre>		<pre>
		+	numpad<3> - switch to the side view
	<Tab>		<Tab>
	<B> - border select (select the top nodes)		<B> - border select (select the top nodes)

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Revision as of 14:18, 14 March 2008

Contents 1 Using Blender to create solids for Gerris 1.1 How to create a wing 1.1.1 Start with an empty scene (camera and light is OK) 1.1.2 Add Bezier curve 1.1.3 Close the curve 1.1.4 Subdivide it 1.1.5 Disable the Back and Front for the curve 1.1.6 Extrude the curve 1.1.7 Convert the curve to mesh 1.1.8 Close the top and bottom parts of the mesh 1.1.9 Recalculate normals 1.1.10 Export the mesh in STL format 1.2 STL to GTS 1.2.1 Convert from .stl to .gts 1.2.2 Transform the wing.gts 1.3 Example simulation

Using Blender to create solids for Gerris

This is a short introduction to using Blender for creation of solid bodies for inclusion in Gerris simulation.

How to create a wing

Start with an empty scene (camera and light is OK)

Add Bezier curve

<space> -> add -> curve -> bezier curve

Close the curve

<TAB>
<C>

Subdivide it

(curve) -> segments -> subdivide

Disable the Back and Front for the curve

De-select "Back" and "Front" (this is done in bottom window in blender)

Extrude the curve

Set the extrude level to 1

Convert the curve to mesh

Switch to object mode - <TAB>.

(object) -> convert object type: Mesh

Close the top and bottom parts of the mesh

numpad<3> - switch to the side view
<Tab>
<B> - border select (select the top nodes)

(mesh) -> faces -> fill

<A>
<B> - border select (select the bottom nodes)

Recalculate normals

<A>
<A>

Now you should have all mesh nodes selected.

(mesh) -> normals -> recalculate inside

Export the mesh in STL format

<TAB> - go to object mode

Select the wing...

(File) -> Export -> STL

Save the file as wing.stl

STL to GTS

Convert from .stl to .gts

stl2gts < wing.stl > wing.gts

Transform the wing.gts

transform -o < wing.gts | transform -t 1 > blender_1.gts 

The first transform normalizes the wing, the 2nd one moves it to 2nd cell along X axis. The resulting file "blender_1.gts" is ready for use in Gerris simulation.

Example simulation

gfs gfv gts