Geometry 1
Now draw the model geometry. Use blocks to define the electrolyte and the porous electrode domains. Then use a workplane to draw the inlet hole at the top of the porous electrode. Facilitate geometry selection later (when setting up the physics interfaces) by enabling Resulting objects selection and renaming the geometry objects.
Begin by setting the default length unit to millimeters.
1
In the Model Builder under Component 1, click Geometry 1 .
2
In the Settings window for Geometry locate the Units section. From the Length unit list, choose mm.
Create the First Block
1
In the Geometry toolbar click Block .
2
In the Model Builder under Geometry 1, click Block 1 .
3
In the Settings window for Block, type Membrane in the Label text field.
4
In the Settings window for Block locate the Size section.
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In the Width text field, type S.
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In the Depth text field, type S
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In the Height text field, type d.
5
Locate the Selections of Resulting Entities section. Enable the Resulting objects selections checkbox. By enabling Resulting objects selection here, the domain created by this rectangular block will also be available as a named domain option later on when setting up the physics.
6
Click the Build Selected button .
Duplicate the Block and Change z Position
7
Right-click Membrane and choose Duplicate .
8
In the Label text field, type Cathode Gas Diffusion Electrode.
9
In the Settings window for Block locate the Position section. In the z text field, type d.
Duplicate the Cathode Block to Draw the Anode
1
Right-click Cathode Gas Diffusion Electrode and choose Duplicate.
2
In the Settings window for Block, type Anode Gas Diffusion Electrode in the Label text field.
3
Locate the Position section. In the z text field, type -d.
4
Click  Build Selected. Your geometry should now look like this:
Create a Work Plane for Drawing the Inlet Hole
Proceed to draw the inlet hole, placed at the top of the cathode gas diffusion electrode block.
1
In the Geometry toolbar click Work Plane .
2
In the Label text field, type Inlet.
3
In the Settings window for Work Plane locate the Plane Definition section. In the z-coordinate field, type 2*d.
4
Locate the Selections of Resulting Entities section. Enable the Resulting objects selections checkbox.
Draw the Inlet Hole
1
In the Model Builder under Geometry 1 > Inlet, right-click Plane Geometry and choose Circle .
2
In the Settings window for Circle locate the Size and Shape section.
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In the Radius text field, type 1.
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In the Sector angle text field, type 90.
3
Locate the Position section.
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In the xw text field, type S.
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In the yw text field, type S.
4
Locate the Rotation Angle section. In the Rotation text field, type 180.
5
Click the Build Selected button . Your work plane 2D geometry should now contain a quarter of a circle, looking as follows:
Form a Union to Finalize the Geometry
1
In the Model Builder click the Form Union node and then click the Build Selected button .
2
Click the Zoom Extents button in the Graphics toolbar. The final 3D geometry should now look like this: