Using Blender to create solids for Gerris

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=== How to create a wing === === How to create a wing ===
==== Start with an empty scene (camera and light is OK) ==== ==== Start with an empty scene (camera and light is OK) ====
-[[Image:blender_1_001.jpeg|thumb|frame|Start]]+[[Image:blender_1_001.jpeg|Start]]
==== Add Bezier curve ==== ==== Add Bezier curve ====
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</pre> </pre>
-[[Image:blender_1_002.jpeg|thumb]]+[[Image:blender_1_002.jpeg]]
==== Close the curve ==== ==== Close the curve ====
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</pre> </pre>
-[[Image:blender_1_003.jpeg|thumb]]+[[Image:blender_1_003.jpeg]]
==== Subdivide it ==== ==== Subdivide it ====
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</pre> </pre>
-[[Image:blender_1_004.jpeg|thumb]]+[[Image:blender_1_004.jpeg]]
==== Disable the Back and Front for the curve ==== ==== Disable the Back and Front for the curve ====
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(object) -> convert object type: Mesh (object) -> convert object type: Mesh
-[[Image:blender_1_005.jpeg|thumb]]+[[Image:blender_1_005.jpeg]]
-[[Image:blender_1_006.jpeg|thumb]]+[[Image:blender_1_006.jpeg]]
==== Close the top and bottom parts of the mesh ==== ==== Close the top and bottom parts of the mesh ====
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(mesh) -> faces -> fill (mesh) -> faces -> fill
-[[Image:blender_1_007.jpeg|thumb]]+[[Image:blender_1_007.jpeg]]
<pre> <pre>
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</pre> </pre>
-[[Image:blender_1_008.jpeg|thumb]]+[[Image:blender_1_008.jpeg]]
==== Recalculate normals ==== ==== Recalculate normals ====
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(mesh) -> normals -> recalculate inside (mesh) -> normals -> recalculate inside
-[[Image:blender_1_009.jpeg|thumb|frame|The result]]+[[Image:blender_1_009.jpeg|frame|The result]]
==== Export the mesh in STL format ==== ==== Export the mesh in STL format ====
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[[media:blender_1.gts|gts]] [[media:blender_1.gts|gts]]
-[[Image:blender_1_simulation.jpeg|thumb|frame|The result]]+[[Image:blender_1_simulation.jpeg|frame|The result]]

Revision as of 14:15, 14 March 2008

Contents

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)

Start

Add Bezier curve

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

Image:blender_1_002.jpeg

Close the curve

<TAB>
<C>

Image:blender_1_003.jpeg

Subdivide it

(curve) -> segments -> subdivide

Image:blender_1_004.jpeg

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

Image:blender_1_005.jpeg

Image:blender_1_006.jpeg

Close the top and bottom parts of the mesh

Switch to the side view

<Tab>
<B> - border select (select the top nodes)

(mesh) -> faces -> fill

Image:blender_1_007.jpeg

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

Image:blender_1_008.jpeg

Recalculate normals

<A>
<A>

Now you should have all mesh nodes selected.

(mesh) -> normals -> recalculate inside

The result
The result

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

The result
The result
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