DesignModeler-Static Mixer

Goals

This workshop will take you through the process of creating a geometry in DesignModeler and using the Automatic meshing method to create a simple mesh for that geometry.

The basic steps involved in creating a CFD mesh are:

– 1. Create the Geometry (DesignModeler).

– 2. Define Named Selections for some 2D regions (DesignModeler).

– 3. Create surface and volume mesh (Meshing).

This workshop is intended to give you a feel for the geometry
and mesh creation process from start to finish. Some of the methods
used and the steps you follow will be discussed and explained
in later lectures.

The geometry you will be creating and meshing is shown below:

Launch DesignModeler

Create Geometry

You will begin by creating a sketch of the main body profile which you will revolve about the Y-axis to create the main body of the mixer

1. Modeling: > ZXPlane

– Selecting ZXPlane on the tree displays the sketch plane on the Model View.

1. Click on the Look-At iconto orient the view normal to the plane.

1. Modeling: Sketching tab

– Selecting the Sketching tab after selecting a plane creates a new sketch and toggles to Sketching mode

1. Sketching: Settings > Grid

– This is a simple geometry characterized by dimensions of 2.0 m, 1.0 m, & 0.5 m. A grid can be displayed and snapped to simplify the assignment of the proper dimensions.

1. Toggle on Show in 2D and Snap to Grid
2. Click on Major Grid Spacing and set it to 1.0 m
3. Click on Minor-Steps per Major and set it to 2
4. Zoom in on the model view (click and drag with the right mouse button) so that the area displayed is centered about the origin with six major steps in the x- and z-directions.

You will now draw the outline of the main body profile as a closed-ended polyline. The profile of the polyline is shown below. Its left edge lies on the X-axis. The main portion is a square with a height and width of two. A tapered section reduces the width to 0.5 over a vertical distance of 1.0. The 0.5 width is maintained for a vertical distance of 1.0 and then the profile is closed as shown.

1. Sketching: > Draw > Polyline

– Left-click on the sketch to define each end point of the various line segments in turn. When you arrive back at the starting point, right click and select Closed End from the menu that pops up.

You have now completed Sketch1. You will now revolve this sketch by 360 degrees about the X-axis to create the main body of the mixer.

You will revolve Sketch1 by 360 degrees about the X-axis to create the main body of the mixer.

1. Click on the Revolve iconon the menu bar to bring up the Details View for the revolve 3D operation

-The view will switch to the Modeling view

1. In the Details View, the Axis box should have Apply and Cancel tabs. If these are shown, left- click on the local Y-axis (which is aligned with global X-axis) and then left-click on Apply. If the Axis box, shows Not Selected, you must left-click in it first to bring up the Apply/Cancel tabs.
2. Set the Angle to 360 degrees and leave the other settings at their default values

1. Click on Generateon the main toolbar

-You should see the solid geometry created by revolving Sketch1 through a full circle about the X-axis

You will now create a new sketch on the Z-X plane to draw the profile of the first-side pipe. The body you’ve already created may make it difficult to see the sketch clearly, so you will begin by hiding this body.

http://www.cadfamily.com/html/Article/DesignModeler-Static%20Mixer_794_1.htm

http://www.cadfamily.com/html/Article/DesignModeler-Static%20Mixer_794_2.htm

DesignModeler-3D Curve Tutorial

Goals:

-Utilize a 3D Coordinate point file to generate a 3D curve.

-Use >Sweep to create a new part from the curve.

Extrude, Revolve, etc, could similarly be used

Project Page> Component Systems> Geometry

Project Page> Component Systems> Geometry

DM will Open. When prompted choose “mm” as the length unit

1. >Concept>3D Curve

1. In Details,

>Definition should be “From Coordinates File”

At “>Coordinates File” click … to browse

1. Browse as necessary to file “sine_points.txt” and >Open it

“>Generate” the 3D Curve “Line Body”

1. From the Tree, select the “Curve1” 3d Curve

Name the selection:

1. >Tools>Named Selection
2. In the Tree, select “Line Body” under “ Part, 1 Body”
3. Click “Apply” in the Details window for Geometry

Click “>Generate”

1. Select “NamedSel1” from the tree
2. Click on “Revolve”
3. Select the Y-axis
4. Click “>Apply” in the Details window for Axis

1. Select “FD1, Angle” in the Details window and enter a value of 360 to replace the default value.

1. “>Generate” the surface

http://www.cadfamily.com/html/Article/DesignModeler-3D%20Curve%20Tutorial_797_1.htm

DesignModeler-Enclosure Operation

Goals:

-Import a model in Para-solid format

-Use the enclosure operation to create a solid region representing the model’s surrounding field

Project Page> Component Systems> Geometry

Project Page> Component Systems> Geometry

DM will Open. When prompted choose “meter” as the length unit

Import the Parasolids file “blade.x_t”

1. [Main menu] >File> Import External Geometry File . . . Browse to file “blade.x_t” and open.
2. “Generate” the import.

1. From the “Tools” menu choose “Enclosure”
2. Choose “Cylinder” from the shape field in the details window
3. “Generate” the enclosure

Note: we left the cushion field set to the default 1m. Larger or smaller bounding enclosures can be defined using this field.

With the enclosure generated, notice there are now 2 bodies in the tree, one frozen (the enclosure) and one active (the blade)

1. From the tree highlight the active solid (the blade), RMB and “Hide Body”

With the blade hidden it can be seen that the enclosure contains a void representing the boundaries of the structure. This enclosure is suitable for meshing .

http://www.cadfamily.com/HTML/Article/DesignModeler-Enclosure%20Operation_798.htm

DesignModeler-Catalytic Converter

Goals:

– Create the catalytic converter model shown below as 3 separate bodies

– Create separate sketches and perform a skin/loft operation to make the converter body

Starting Workbench

-Start Workbench. Double click on Geometry under Component Systems.

-This will create a ‘Geometry component’ in the Project Schematic area.

-Double clickto launch DM (use millimeter as the length unit)

Step 1

Create the flange sketch #1

-[Modeling] > A: Geometry > XYPlane

Toolbar: New Sketch

Sketch1 will be created on XYPlane

In the Details view, rename Sketch1 to “BaseCircle”.

Toolbar: “Look At” icon

-[Sketching] > Draw > Circle

Move the cursor over the sketch origin, then when the “P” is displayed (auto-constraint), click on the left mouse button. Click again to define the radius.

-[Sketching] > Dimensions > Radius

Click on the circle to select it, then click again on the screen to define where to place the dimension.

In the Details view, define Dimensions > R1 as “2.5”.

Create the flange sketch #1 (cont’d)

-On the Selection Toolbar, select the “New Selection” icon.

-Click on the “Select Mode” icon and choose “Box Select”

-Left click and drag to draw a box, selecting the entire circle.

[Sketching] > Modify > Move

-In the text boxes next to the Move tool, change r= to “22.5” and f= to “1”.

-Right-click on the Model View and select “Use Plane Origin as Handle”. This will make the moving reference point as the original, relative location of the sketch origin.

Create the flange sketch #1 (cont’d)

-Right click anywhere on the Model View and select “Rotate by r Degrees”. This makes the moving operation include a rotation, as specified by the value of “22.5” degrees entered earlier.

-Right click anywhere on the Model View and select “Paste at Plane Origin”. This completes the move operation by moving the model to the origin. Since the reference point was the origin, this results in no translation but only a rotation, specified by r=22.5.

-Right click anywhere on the Model View and select and left-click End. This completes the Move operation.

Create the flange sketch #1 (cont’d)

-You should see that the segments have been rotated by 22.5 degrees.

-Click on the “Select Mode” icon and choose “Box Select”

-Left click and drag to draw a box, selecting the entire circle.

[Sketching] > Modify > Copy

-Click on the Copy tool to copy this profile.

-Right-click anywhere on the Model View and select “Use Plane Origin as Paste Handle” to -make the paste operation use the original, relative location of the sketch origin as the pasting point.

Step 2

Create the flange sketch #2

– [Modeling] > Toolbar: XYPlane

– Toolbar: New Plane

Select the New Plane icon from the Active Plane/Sketch Toolbar. This creates Plane4 based on XYPlane.

In the Details view, set Transform 1 to Offset Z, change FD1, Value to be “1”.

– Toolbar: Generate

– [Sketching] > Modify > Paste

Enter “0” for r= and “1.05” for f=.

Right-click anywhere on the Model View and select “Scale by factor f”. This will scale the original sketch profile by a factor of 1.05 for our new sketch.

http://www.cadfamily.com/html/Article/DesignModeler-Catalytic%20Converter_796_1.htm

http://www.cadfamily.com/html/Article/DesignModeler-Catalytic%20Converter_796_2.htm

http://www.cadfamily.com/html/Article/DesignModeler-Catalytic%20Converter_796_3.htm

DesignModeler-Mid Surface Creation

Goal

– Familiarize users with mid-surface capabilities

– Demonstrate manual and automatic pair detection

– Demonstrate surface extension for interfaces

Model Description

– 2 part bracket with consistent cross sections

– Since the model has consistent cross sections, shell elements will be used to mesh the model. This saves time and CPU resources.

Project Page> Component Systems> Geometry

Project Page> Component Systems> Geometry

DM will Open. When prompted choose “mm” as the length unit

Import the Parasolids file “bracket_mid_surface.x_t”

1. [Main menu] >File> Import External Geometry File . . . Browse to file “bracket_mid_surface.x_t” and open.
2. “Generate” the import.

In the Model Tree, note that there are 2 separate parts:

1. Each body of this model has different thicknesses. These thickness dimensions will be entered into the Maximum Threshold and Minimum Threshold fields in the Details of the MidSurf object.
   Menu Bar > Selection Filter – Edges.
   Use the status bar measuring tools to verify these thicknesses.

1. Insert a mid-surface object Main Menu > Tools > Mid-Surface

1. In the Details of MidSurf1, change the Selection Method to Automatic

1. Enter the Minimum Threshold of 1mm and Maximum Threshold of 2mm obtained from step 3.

1. Set “Find Face Pairs Now?” to “Yes”

1. The Face Pair Automatic Selection method will select 11 face pairs. However, the automatic selection method has incorrectly identified the following features:

a) A face pair that is not needed.
b) A face pair whereby the normal will need to be reversed

http://www.cadfamily.com/html/Article/DesignModeler-Mid%20Surface%20Creation_799_1.htm

http://www.cadfamily.com/html/Article/DesignModeler-Mid%20Surface%20Creation_799_2.htm

DesignModeler-Introduction

Course Objectives

To teach the use of DesignModeler in the following areas:

-General understanding of the user interface

-Procedure for creating sketches and assigning dimensions

-Procedure for creating and modifying 3D geometry

-Working with imported CAD geometries and using 3D operations to
-extract fluid regions from solid parts

-Parametric modeling

Course Materials

-The Training Manual you have is an exact copy of the slides.

-Workshop descriptions and instructions are included in the Training Manual.

-Copies of the workshop files are available (upon request) from the instructor.

-Several advanced training courses are available on specific topics. See the training course schedule on the ANSYS homepage http://www.ansys.com/ under SERVICES > “Training Services”

… ANSYS Family of Products

ANSYS, Inc. Family of Products include the following:

ANSYS Workbench – Complete environment for simulation and modeling needs.

ANSYS CFD – State-of-the-art CFD solvers, including CFX and FLUENT.

-ANSYS Mechanical APDL – Advanced mechanical and multiphysics FEA solution capabilities utilizing the traditional ANSYS user interface.

-ANSYS AUTODYN – Explicit dynamic solver for transient non-linear simulations involving large deformations and strains, non-linear material behavior, non-linear buckling, complex contact, fragmentation, and shock wave propagation.

ANSYS LS-DYNA – LSTC’s LS-DYNA explicit dynamic solver technology with the pre-/post-processing power of ANSYS software. This powerful pairing can be used to simulate crash tests, metal forging, stamping, and catastrophic failures.

-ANSYS ICEM CFD – Powerful meshing tools with general pre- and post-processing features.

-ANSYS EKM – Engineering Knowledge Manager

ANSYS EKM - Engineering Knowledge Manager

What is ANSYS EKM?

-ANSYS Engineering Knowledge Manager (EKM) is a web-based multi-user collaborative product that is aimed at meeting the simulation data and process management challenges faced by our customers. EKM is tightly integrated with other ANSYS simulation offerings and it can also be very easily integrated with other simulation codes including legacy and competitor’s software.

What is ANSYS EKM Desktop?

-ANSYS EKM Desktop is a single user, local environment version of EKM. It is available as part of ANSYS R12 release and it can be accessed via Workbench. EKM Desktop is focused at meeting the challenge of “re-using existing simulations” and thereby increasing simulation productivity and efficiency.

Why Manage Simulation Data and Processes?

Managing simulation data reduces engineering costs

-Eliminate wasted time looking for prior simulation data

-Enable re-use of existing data

Managing simulation processes and workflows

-Enables a collaborative environment for distributed simulation

ANSYS EKM - Engineering Knowledge Manager

ANSYS EKM - A User Scalable Solution

B. ANSYS Workbench Overview

What is ANSYS Workbench?

-ANSYS Workbench provides powerful methods for interacting with the ANSYS family of solvers. This environment provides a unique integration with CAD systems, and your design process.

ANSYS Workbench is comprised of various applications (some examples):

-Mechanical for performing structural and thermal analyses using the ANSYS solver

Meshing is also included within the Mechanical application

-Fluid Flow (CFX) for performing CFD analyses using CFX

-Fluid Flow (FLUENT) for performing CFD analyses using FLUENT

-Geometry (DesignModeler) for creating and modifying CAD geometry to prepare the solid model for use in Mechanical.

-Engineering Data for defining material properties

-Meshing Application for generating CFD and Explicit Dynamics meshes

-Design Exploration for optimization analyses

-Finite Element Modeler (FE Modeler) for translating a NASTRAN and ABAQUS mesh for use in ANSYS

-BladeGen (Blade Geometry) for creating blade geometry

-Explicit Dynamics for explicit dynamics simulations featuring modeling of nonlinear dynamics

ANSYS Workbench Overview

The Workbench environment supports two types of applications:

-Native applications (workspaces): Current native applications are Project Schematic, Engineering Data and Design Exploration.

Native applications are launched and run entirely in the Workbench window.

-Data Integrated Applications: current applications include Mechanical, Mechanical APDL, FLUENT, CFX, AUTODYN and others.

C. Starting DesignModeler

There are two methods of launching Workbench:

-From the Windows start menu:

D. The Workbench Environment

For most situations the Workbench GUI is divided into 2 primary sections (there are other optional sections we’ll see in a moment):

http://www.cadfamily.com/html/Article/DesignModeler-Introduction_787_1.htm

http://www.cadfamily.com/html/Article/DesignModeler-Introduction_787_2.htm