# Pipe into a Box

Create a symmetrical quadrant of a flow volume by uniting a box with a cylinder and then intersecting the resulting geometry with another box.

Checkout a screencast of this tutorial at "Screencast of Flow Through a Pipe into a Box."

### Goals

In this tutorial, you will learn how to:

• Create a box and a cylinder
• Translate objects
• Unite volumes
• Intersect volumes

### Assumptions

1. You have activated the Caedium Builder add-on or Caedium Professional.
2. You are familiar with Caedium essentials.

## Create a Box

Select the Geometry Tool Palette.

Select the Volumes->Box tool. In the Properties Panel, set Lengths to [1 1 4]. Press Enter on the keyboard to apply the changes to the Properties Panel.

Drag and drop the Volumes->Box tool onto the View Window (view). Select Done to create a box (volume).

All geometry is created at the origin by default.

To shade the faces of the box, right-click on one of the edges of the volume, double-click volume->Faces, and then select Properties from the menu. In the Properties Panel, turn off the Transparent property.

## Create a Cylinder

In the Geometry Tool Palette, select the Volumes->Cylinder tool and turn off the Decompose property in the Properties Panel. Set the Radius to 0.2 and set Z Height to 1. Press Enter on the keyboard to apply the changes to the Properties Panel.

The Decompose option instructs Caedium to split the cylinder into six four-edged faces. This option is useful in simplifying the meshing process.

To rotate the view so you can see the reference face used in the next step, left-click-and-drag the mouse in the View Window until your view looks like that shown below.

Drag and drop the Volumes->Cylinder tool directly onto the box (volume) face furthest away from the origin in the Z direction. Double-click the first face in the Select dialog and select Done to generate a cylinder (volume_1).

In the Home Toolbar click the Fit-All button to see all the geometry in the View Window.

The cylinder base will be centered on the box face.

## Translate the Cylinder

The cylinder needs to be translated toward the box (in the -Z-direction) to ensure a good overlap (avoid coincident geometry) between the cylinder and the box face, ready for the unite Boolean operation.

To translate the cylinder (volume_1) to a new location in the View Window, select the Transforms->Translate tool. In the Properties Panel set Translate to [0 0 -0.1] and press Enter on the keyboard to apply the changes.

Drag the Transforms->Translate tool and drop it directly onto the cylinder in the View Window. Select Done to translate the cylinder.

## Unite the Box and the Cylinder

Drag and drop the Booleans->Unite tool directly onto a face of the box. Double-click volume in the Select dialog to select the box. Select Select/Deselect from the menu, right-click on an edge of the cylinder (volume_1), and then double-click volume_1 to select the cylinder. Select Done to unite the cylinder and the box and create a new volume (volume_2).

Select the Volumes->Box tool. In the Properties Panel, set Lengths to [2 2 6]. Press Enter on the keyboard to apply the changes to the Properties Panel.

Drag and drop the Volumes->Box tool onto the View Window (view). Double-click sim in the Select dialog and select Done to create the quadrant box (volume_3).

## Translate and Intersect

Translate the united box and cylinder (volume_2) to [-0.5 -0.5 0.5], using the same procedure as in the previous translation.

Drag and drop the Booleans->Intersect tool directly onto an edge of the united box and cylinder (volume_2). Double-click volume_2 in the Select dialog to select the volume.

Select Select/Deselect from the menu, right-click on the edge of the quadrant box (volume_3), and then double-click volume_3. Select Done to intersect the two volumes and create a new volume (volume_4).

### Notes

The complete geometry created in this tutorial is available as a free download.

See the "Incompressible Flow Through a Pipe into a Box" tutorial for a flow simulation through this geometry.