dm-intro 14.5 ws-05c applications chamber

2012 ANSYS, Inc. November 20, 2012 1 Release 14.5

14. 5 Release

Introduction to ANSYS DesignModeler

Workshop 5c Applications - 2D Conical Combustion Chamber


Introduction

Background

This workshop will apply sketching, modeling and parameterization techniques to the construction of a 2d axisymmetric conical combustion chamber though the methods demonstrated will be useful for any 2D model.

Objectives

Sketching Modeling (2d) Parameterization


Project Startup

Create the Project

Start Workbench or, if Workbench is already open, click New to create a new project.

Expand Component Systems and drag and drop a Geometry component system into the Project Schematic.

Double click on the Geometry cell (A2) to start DesignModeler.


Starting the DesignModeler Session

Set Units

In the Units specification box select Millimeter.

Click OK.


Planning

To start, well create a sketch representing a 2d axisymmetric section of the real chamber. For reference, a model of the real 3d chamber is shown here illustrating the 2d axisymmetric section we will be creating.

Preparation

Gases In

Products of Combustion

Out

2d Axisymmetric

Section

3d Chamber

Model Sketch


Sketch Creation

Create a Sketch

In the Tree Outline, select the XY Plane.

Click the Look At button in the toolbar.

Select the Sketching Mode Tab.

Select the Draw Toolbox.


Create the Section Sketch

Select the Line Tool.

Draw a line along the X Axis by clicking once on the origin and again on the X Axis.

Make sure you see the P, H and C (Point, Horizontal and Coincident) constraints as you draw the line.

Position it only approximately as shown.

Sketch Creation


Create the Section Sketch (Cont...)

From the Dimensions Toolbox select the General Tool.

1. Select the edge. 2. Click to position the dimension. In the Details View, set the

dimension to 68.41mm.

Sketch Creation

1

2



Click the Zoom to Fit button in the Toolbar.

From the Draw Toolbox select the Polyline Tool.

Following the sequence (right) 1. Click on the origin.

2. Click on the Y Axis.

3. Click to define the horizontal segment.

4. Right click and select Open end from the Context Menu.

Sketch Creation

1

2

3

4



From the Dimensions Toolbox select the General Tool.


dimension to 3mm.

Sketch Creation

1

2



Using the General Tool again dimension the horizontal edge as shown;


dimension to 23.41mm.

Sketch Creation

1

2



From the Draw Toolbox select the Arc by Center Tool.

Following the sequence (right)

1. Click on the origin.

2. Click on the point.

3. Click to define the arc.

Sketch Creation

1

2

3



From the Draw Toolbox select the Polyline Tool.

Following the sequence (right) 1. Click on the arc point.

2. Click (approximate location*)

3. Click on Y Axis

4. Move down and click on Y Axis.

5. Move across, click (approximate location) then right click, select Open End from Context Menu.

Sketch Creation

1

2 3

4 5

*Ensure only the P constraint is visible here at step 2



Using the General Tool again dimension the horizontal edge as shown;

1. Select the edge. 2. Click to position the dimension. In the Details View, set the dimension to

13.74mm.

Sketch Creation

1

2



Using the General Tool again dimension the vertical edge as shown;


4mm.

Sketch Creation

1

2



From the Constraints Toolbox, select the Equal Length Tool.

1. Select the upper edge. 2. Select the lower edge. The lower edge will now be constrained

to be of equal length to the upper dimensioned edge.

Sketch Creation

1

2



From the Dimensions Toolbox, select the Angle Tool.

1. Select the first edge. 2. Select the Y Axis. 3. Right click and select Alternate Angle

until the correct angle dimension is shown then click to position the dimension.

In the Details View, set the dimension to 60.

Sketch Creation 1

2

3



From the Draw Toolbox select the Arc by Center Tool.

Follow the sequence (right) 1. Click on the origin.

2. Click on the point.

3. Click to define the arc in the approximate location.

Ensure you do not see a C constraint here.

Sketch Creation 1

2

3



From the Draw Toolbox select the Line Tool.

Follow the sequence (right) 1. Click on the first point.

2. Click on the second point.

Sketch Creation

1

2



From the Constraints Toolbox select the Parallel Tool.

Follow the sequence (right) 1. Click on the first edge.

2. Click on the second edge.

The lower edge will now be constrained to be parallel to the dimensioned upper edge.

Sketch Creation

1

2



From the Dimensions Toolbox, select the General Tool.


9mm.

Sketch Creation

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2


Review the Sketch

Check the Sketch and dimensions match the illustration shown below.

Review


Planning

When constructing geometry its a good idea to plan for the type of mesh that will be used.

In this case we want to be able to control the mesh intervals on the highlighted sections of the edges.

We will therefore need to split the longer edges.

We will also parameterize the base of the chamber.

Preparation



From the Modify Toolbox, select the Split Tool.

Make sure it is set to Split at Select, if not right click in the Graphics Window and select.

Click the two edges in the approximate locations as shown to create the edges splits.

Sketch Creation

1

2



From the Constraints Toolbox, select the Equal Length Tool.

1. Select the first edge as shown. 2. Select the second edge as shown. The two edges will be constrained to

equal length.

Sketch Creation

1

2



Using the Equal Length Tool again repeat the procedure.

1. Select the first edge as shown. 2. Select the second edge as shown. The two edges will be constrained to

equal length.

Sketch Creation

1

2


Create the Surface

Return to Modeling Mode using the tab.

In the Tree Outline, select Sketch1. From the Concept Menu, select

Surfaces From Sketches.

In the Details View, apply the selection in the Base Objects Selection Box.

Generate.

Surface Creation


Parameterize Chamber Base

In the Tree Outline, select Sketch 1.

In the Details View, check the box next to the horizontal dimension H1 as shown.

Enter the name Chamber_Depth in the parameter dialog box and click ok.

Parameterization


Parameters in Workbench

Close DesignModeler. Workbench will automatically

save geometric data.

Switch to the Workbench Project Page.

In the Project Schematic, double click the Parameter Set Box.

The parameter controlling the total chamber depth is displayed in the Design Points Table and can be controlled from Workbench.

Click Return to Project.

Parameterization


This completes the workshop. From the main menu select File Close DesignModeler

Workbench will save any application data.

From the Workbench Project Page use the file menu and save the project as DMWS5c.wbpj to your working folder.

Saving the Project

dm-intro 14.5 ws-05c applications chamber

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