ANSYS 14.5 ICEM CFD Tutorial Manual.pdf

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ANSYS ICEM CFD Tutorial Manual

Table of Contents

Hexa Mesh Generation for a 2D Pipe Junction

Preparation

Blocking Strategy

Step 1: Block the Geometry

Step 2: Associate Entities to the Geometry

Step 3: Move the Vertices

Step 4: Apply Mesh Parameters

Step 5: Generate the Initial Mesh

Step 6: Adjust the Edge Distribution and Refine the Mesh

Step 7: Match the Edges

Step 8: Verify and Save the Mesh and Blocking

Hexa Mesh Generation for a 2D Car

Start a New Project and Initiate Replay Control

Create and Split the Blocking to Resemble the Geometry

Associate and Fit the Blocking to the Geometry

Align the Vertices

Set Mesh Parameters and Generate the Initial Mesh

Create an O-grid

Refine the Mesh using Edge Parameters

Save the Replay File and Use it for Design Iteration

Create Output Data for a Solver

Hexa Mesh Generation for a 3D Pipe Junction

Preparation

Step 1: Creating Parts

Step 2: Creating a Material Point

Step 3: Blocking the Geometry

Step 4: Projecting the Edges to the Curves

Step 5: Moving the Vertices

Step 6: Generating the Mesh

Step 7: Checking the Mesh Quality

Step 8: Creating an O-Grid in the Blocking

Step 9: Verifying and Saving the Mesh

Hexa Mesh Generation for a Sphere Cube Geometry

Preparation

Step 1: Creating Parts

Step 2: Creating a Material Point

Step 3: Blocking the Geometry

Step 4: Creating Composite Curves

Step 5: Projecting Edges to the Curves

Step 6: Moving the Vertices

Step 7: Creating the O-Grid

Step 8: Generating the Mesh

Step 9: Viewing the Scan Planes

Step 10: Verifying and Saving the Mesh

Hexa Mesh Generation for a Pipe with Embedded Blade

Starting the Project

Creating Parts in the Mesh Editor

Initial Blocking and Associations

Splitting and Collapsing Blocks around the Blade

Fit the Blocking to the Blade geometry

Generating the O-Grid

Defining Surface Parameters for the Mesh

Defining Edge Parameters to Adjust the Mesh

Checking and Improving Mesh Quality

Saving

Hexa Mesh Generation for an Elbow Part

Preparation

Step 1: Creating a Material Point

Step 2: Blocking the Geometry

Step 3: Fitting the Blocking to the Geometry

Step 4: Creating the First O-Grid

Step 5: Adjust the O-Grid Edge Length to Improve Quality

Step 6: Generate the Pre-Mesh

Step 7: Creating the Second O-Grid

Step 8: Generating the Mesh

Step 9: Saving the Project

Bottom Up Hexa Mesh Strategy for a Grid Fin

Preparation

Initiate 2D Blocking

Associate Initial Blocking to a Minor Geometry

Create an O-grid and Place Vertices

Rotate and Copy to Resolve Other Geometries

Complete the 2D Grid by Vertex Placement

Extrude a 2D Planar Grid to Create 3D Blocking

Refine the Blocking with Further Splits and Associations

Resolve Zero Thickness Walls

Define Periodicity

Generate the Mesh

Check the Mesh Quality

Reduce the Blocks in a Multiblock Mesh

Save the Mesh

Tetra/Prism Mesh in a Fin Configuration

Prepare the Geometry

Create Surface and Material Parts

Setup Mesh Parameters

Generate the Tetra/Prism Mesh

Check and Smooth the Tetra/Prism Mesh

Build the Hexa-Core mesh

Save and Exit

Tetra Mesh in a Piston/Valve Assembly

Starting the Project

Defining the Parts

Setting Mesh Parameters

Generating the Mesh

Checking the mesh and Cleaning up

Tetra/Prism Mesh Generation for a Helicopter

Preparation

Step 1: Preparing the Geometry

Step 2: Creating a Material Point

Step 3: Generating the Octree Mesh

Step 4: Generating the Delaunay Mesh

Step 5: Smoothing the Mesh

Step 6: Saving the Project

Tetra/Prism Mesh Generation for an Aorta

Preparation

Step 1: Creating Parts

Step 2: Creating the Material Point

Step 3: Generating the Octree Mesh

Step 4: Generating the Delaunay Mesh

Step 5: Saving the Project

Further Setup

Merged Tetra-Hexa Mesh in a Hybrid Tube

Starting the Project

Setting the Mesh Parameters

Generating the Tetra Mesh in CYL1

Generating the Tetra Mesh in CYL2

Merging the Tetra Mesh between CYL1 and CYL2

Generating the Hexa Mesh in CYL3

Merging the Tetra Mesh with Hexa Mesh at Interface2

Cleaning up and Saving the Project

Multizone Mesh in HVAC Square-to-circle Transistion Duct

Prepare the Geometry

Set up Global and Part Parameters

Create Automatic Surface Blocking

Convert the Surface Blocking to 3D Blocking

Checking the Mesh, Saving and Exiting

ANSYS ICEM CFD Tutorial Manual ANSYS, Inc. Southpointe 275 Technology Drive Canonsburg, PA 15317 ansysinfo@ansys.com http://www.ansys.com (T) 724-746-3304 (F) 724-514-9494 ANSYS ICEM CFD 14.5 October 2012 ANSYS, Inc. is certified to ISO 9001:2008.

Copyright and Trademark Information © 2012 SAS IP, Inc. All rights reserved. Unauthorized use, distribution or duplication is prohibited. ANSYS, ANSYS Workbench, Ansoft, AUTODYN, EKM, Engineering Knowledge Manager, CFX, FLUENT, HFSS and any and all ANSYS, Inc. brand, product, service and feature names, logos and slogans are registered trademarks or trademarks of ANSYS, Inc. or its subsidiaries in the United States or other countries. ICEM CFD is a trademark used by ANSYS, Inc. under license. CFX is a trademark of Sony Corporation in Japan. All other brand, product, service and feature names or trademarks are the property of their respective owners. Disclaimer Notice THIS ANSYS SOFTWARE PRODUCT AND PROGRAM DOCUMENTATION INCLUDE TRADE SECRETS AND ARE CONFID- ENTIAL AND PROPRIETARY PRODUCTS OF ANSYS, INC., ITS SUBSIDIARIES, OR LICENSORS. The software products and documentation are furnished by ANSYS, Inc., its subsidiaries, or affiliates under a software license agreement that contains provisions concerning non-disclosure, copying, length and nature of use, compliance with exporting laws, warranties, disclaimers, limitations of liability, and remedies, and other provisions. The software products and documentation may be used, disclosed, transferred, or copied only in accordance with the terms and conditions of that software license agreement. ANSYS, Inc. is certified to ISO 9001:2008. U.S. Government Rights For U.S. Government users, except as specifically granted by the ANSYS, Inc. software license agreement, the use, duplication, or disclosure by the United States Government is subject to restrictions stated in the ANSYS, Inc. software license agreement and FAR 12.212 (for non-DOD licenses). Third-Party Software See the legal information in the product help files for the complete Legal Notice for ANSYS proprietary software and third-party software. If you are unable to access the Legal Notice, please contact ANSYS, Inc. Published in the U.S.A.

Table of Contents Hexa Mesh Generation for a 2D Pipe Junction ........................................................................................... 1 Preparation ............................................................................................................................................ 2 Blocking Strategy ................................................................................................................................... 2 Step 1: Block the Geometry ..................................................................................................................... 3 Step 2: Associate Entities to the Geometry ............................................................................................. 10 Step 3: Move the Vertices ...................................................................................................................... 13 Step 4: Apply Mesh Parameters ............................................................................................................. 17 Step 5: Generate the Initial Mesh ........................................................................................................... 19 Step 6: Adjust the Edge Distribution and Refine the Mesh ...................................................................... 20 Step 7: Match the Edges ........................................................................................................................ 25 Step 8: Verify and Save the Mesh and Blocking ....................................................................................... 29 Hexa Mesh Generation for a 2D Car .......................................................................................................... 31 Start a New Project and Initiate Replay Control ...................................................................................... 31 Create and Split the Blocking to Resemble the Geometry ...................................................................... 34 Associate and Fit the Blocking to the Geometry ..................................................................................... 42 Align the Vertices .................................................................................................................................. 45 Set Mesh Parameters and Generate the Initial Mesh ............................................................................... 48 Create an O-grid ................................................................................................................................... 50 Refine the Mesh using Edge Parameters ................................................................................................ 53 Save the Replay File and Use it for Design Iteration ................................................................................ 57 Create Output Data for a Solver ............................................................................................................. 60 Hexa Mesh Generation for a 3D Pipe Junction ......................................................................................... 63 Preparation .......................................................................................................................................... 64 Step 1: Creating Parts ............................................................................................................................ 64 Step 2: Creating a Material Point ............................................................................................................ 67 Step 3: Blocking the Geometry .............................................................................................................. 68 Step 4: Projecting the Edges to the Curves ............................................................................................. 71 Step 5: Moving the Vertices ................................................................................................................... 73 Step 6: Generating the Mesh ................................................................................................................. 75 Step 7: Checking the Mesh Quality ........................................................................................................ 79 Step 8: Creating an O-Grid in the Blocking ............................................................................................. 80 Step 9: Verifying and Saving the Mesh ................................................................................................... 86 Hexa Mesh Generation for a Sphere Cube Geometry ............................................................................... 89 Preparation .......................................................................................................................................... 90 Step 1: Creating Parts ............................................................................................................................ 90 Step 2: Creating a Material Point ............................................................................................................ 94 Step 3: Blocking the Geometry .............................................................................................................. 95 Step 4: Creating Composite Curves ........................................................................................................ 95 Step 5: Projecting Edges to the Curves ................................................................................................... 97 Step 6: Moving the Vertices ................................................................................................................... 98 Step 7: Creating the O-Grid ................................................................................................................... 99 Step 8: Generating the Mesh ............................................................................................................... 103 Step 9: Viewing the Scan Planes ........................................................................................................... 105 Step 10: Verifying and Saving the Mesh ................................................................................................ 107 Hexa Mesh Generation for a Pipe with Embedded Blade ....................................................................... 109 Starting the Project ............................................................................................................................. 110 Creating Parts in the Mesh Editor ........................................................................................................ 110 Initial Blocking and Associations ......................................................................................................... 114 Splitting and Collapsing Blocks around the Blade ................................................................................ 119 Fit the Blocking to the Blade geometry ................................................................................................ 123 ANSYS ICEM CFD 14.5 - © SAS IP, Inc. All rights reserved. - Contains proprietary and confidential in- formation of ANSYS, Inc. and its subsidiaries and affiliates. iii

Tutorials Generating the O-Grid ........................................................................................................................ 126 Defining Surface Parameters for the Mesh ........................................................................................... 128 Defining Edge Parameters to Adjust the Mesh ..................................................................................... 130 Checking and Improving Mesh Quality ................................................................................................ 133 Saving ................................................................................................................................................ 136 Hexa Mesh Generation for an Elbow Part ............................................................................................... 137 Preparation ........................................................................................................................................ 138 Step 1: Creating a Material Point .......................................................................................................... 140 Step 2: Blocking the Geometry ............................................................................................................ 142 Step 3: Fitting the Blocking to the Geometry ........................................................................................ 144 Step 4: Creating the First O-Grid .......................................................................................................... 148 Step 5: Adjust the O-Grid Edge Length to Improve Quality ................................................................... 152 Step 6: Generate the Pre-Mesh ............................................................................................................ 158 Step 7: Creating the Second O-Grid ..................................................................................................... 160 Step 8: Generating the Mesh ............................................................................................................... 163 Step 9: Saving the Project .................................................................................................................... 170 Bottom Up Hexa Mesh Strategy for a Grid Fin ........................................................................................ 175 Preparation ........................................................................................................................................ 177 Initiate 2D Blocking ............................................................................................................................. 177 Associate Initial Blocking to a Minor Geometry .................................................................................... 179 Create an O-grid and Place Vertices ..................................................................................................... 184 Rotate and Copy to Resolve Other Geometries .................................................................................... 187 Complete the 2D Grid by Vertex Placement ......................................................................................... 189 Extrude a 2D Planar Grid to Create 3D Blocking ................................................................................... 193 Refine the Blocking with Further Splits and Associations ...................................................................... 195 Resolve Zero Thickness Walls ............................................................................................................... 203 Define Periodicity ............................................................................................................................... 207 Generate the Mesh ............................................................................................................................. 209 Check the Mesh Quality ...................................................................................................................... 211 Reduce the Blocks in a Multiblock Mesh .............................................................................................. 212 Save the Mesh .................................................................................................................................... 215 Tetra/Prism Mesh in a Fin Configuration ................................................................................................ 217 Prepare the Geometry ......................................................................................................................... 217 Create Surface and Material Parts ........................................................................................................ 219 Setup Mesh Parameters ...................................................................................................................... 221 Generate the Tetra/Prism Mesh ........................................................................................................... 225 Check and Smooth the Tetra/Prism Mesh ............................................................................................. 227 Build the Hexa-Core mesh ................................................................................................................... 229 Save and Exit ...................................................................................................................................... 231 Tetra Mesh in a Piston/Valve Assembly .................................................................................................. 233 Starting the Project ............................................................................................................................. 234 Defining the Parts ............................................................................................................................... 235 Setting Mesh Parameters .................................................................................................................... 238 Generating the Mesh .......................................................................................................................... 241 Checking the mesh and Cleaning up ................................................................................................... 244 Tetra/Prism Mesh Generation for a Helicopter ....................................................................................... 247 Preparation ........................................................................................................................................ 248 Step 1: Preparing the Geometry ........................................................................................................... 248 Step 2: Creating a Material Point .......................................................................................................... 250 Step 3: Generating the Octree Mesh .................................................................................................... 252 Step 4: Generating the Delaunay Mesh ................................................................................................ 259 Step 5: Smoothing the Mesh ............................................................................................................... 262 iv ANSYS ICEM CFD 14.5 - © SAS IP, Inc. All rights reserved. - Contains proprietary and confidential in- formation of ANSYS, Inc. and its subsidiaries and affiliates.

Tutorials Step 6: Saving the Project .................................................................................................................... 263 Tetra/Prism Mesh Generation for an Aorta ............................................................................................. 265 Preparation ........................................................................................................................................ 266 Step 1: Creating Parts .......................................................................................................................... 267 Step 2: Creating the Material Point ....................................................................................................... 270 Step 3: Generating the Octree Mesh .................................................................................................... 271 Step 4: Generating the Delaunay Mesh ................................................................................................ 279 Step 5: Saving the Project .................................................................................................................... 283 Further Setup ..................................................................................................................................... 286 Merged Tetra-Hexa Mesh in a Hybrid Tube ............................................................................................. 289 Starting the Project ............................................................................................................................. 290 Setting the Mesh Parameters .............................................................................................................. 290 Generating the Tetra Mesh in CYL1 ...................................................................................................... 291 Generating the Tetra Mesh in CYL2 ...................................................................................................... 293 Merging the Tetra Mesh between CYL1 and CYL2 ................................................................................ 295 Generating the Hexa Mesh in CYL3 ...................................................................................................... 296 Merging the Tetra Mesh with Hexa Mesh at Interface2 ......................................................................... 301 Cleaning up and Saving the Project ..................................................................................................... 302 Multizone Mesh in HVAC Square-to-circle Transistion Duct ................................................................... 305 Prepare the Geometry ......................................................................................................................... 305 Set up Global and Part Parameters ...................................................................................................... 306 Create Automatic Surface Blocking ..................................................................................................... 308 Convert the Surface Blocking to 3D Blocking ....................................................................................... 310 Checking the Mesh, Saving and Exiting ................................................................................................ 313 ANSYS ICEM CFD 14.5 - © SAS IP, Inc. All rights reserved. - Contains proprietary and confidential in- formation of ANSYS, Inc. and its subsidiaries and affiliates. v

Hexa Mesh Generation for a 2D Pipe Junction In this tutorial, you will generate a mesh for a two-dimensional pipe junction comprising two inlets and one outlet. After generating an initial mesh, you will check the quality of the mesh, and refine it for a Navier-Stokes solution. Figure 1: 2D Pipe Geometry This tutorial demonstrates how to do the following: • Block the geometry. • Associate entities to the geometry. • Move vertices onto the geometry. • Apply mesh parameters. • Generate the initial mesh. • Adjust the edge distribution and refine the mesh. • Match the edges. • Verify and save the mesh. Preparation Blocking Strategy ANSYS ICEM CFD 14.5 - © SAS IP, Inc. All rights reserved. - Contains proprietary and confidential in- formation of ANSYS, Inc. and its subsidiaries and affiliates. 1

Hexa Mesh Generation for a 2D Pipe Junction Step 1: Block the Geometry Step 2: Associate Entities to the Geometry Step 3: Move the Vertices Step 4: Apply Mesh Parameters Step 5: Generate the Initial Mesh Step 6: Adjust the Edge Distribution and Refine the Mesh Step 7: Match the Edges Step 8: Verify and Save the Mesh and Blocking Preparation 1. Copy the input geometry file (geometry.tin) from the ANSYS installation directory under v145/icemcfd/Samples/CFD_Tutorial_Files/2DPipeJunct to the working directory. 2. Start ANSYS ICEM CFD and open the geometry (geometry.tin). File > Geometry > Open Geometry... Note If you want ANSYS ICEM CFD to behave exactly as this tutorial describes, you should go to the Settings Menu, click Selection, and disable Auto Pick Mode in the DEZ. Most experienced ICEM CFD users prefer to enable Auto Pick Mode as it improves efficiency. See the Selection menu help for more detail. Blocking Strategy The blocking strategy for the 2D pipe geometry involves creating a T-shaped blocking and fitting it to the geometry. The 2D pipe geometry is equivalent to a T shape with the right side of the blocking crossbar bent upward to resemble the geometry. You will fit the T-shaped blocking to the geometry by creating associations between the edges of the blocks and the curves in the geometry, and then moving the vertices of the blocks onto the corners of the geometry. This procedure will be described in subsequent steps. 2 ANSYS ICEM CFD 14.5 - © SAS IP, Inc. All rights reserved. - Contains proprietary and confidential in- formation of ANSYS, Inc. and its subsidiaries and affiliates.

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