SURFACE MESHING OF CYLINDER FOR INTERNAL FLOW SIMULATION BY USING ANSA

Meshing of a cylinder by using ANSA

OBJECTIVE:- The objective of this project is to create a Surface Mesh on a Cylindrical shaped volume for Internal flow analysis of Element size 1 Unit by using ANSA.

WHAT IS ANSA? :-

ANSA is a Computer-aided engineering tool for Finite Element Analysis and CFD Analysis widely used in the automotive industry. It is developed by BETA CAE Systems. The software is distributed world wide by a number of BETA CAE Systems subsidiaries and business agents. In the United States, it is distributed by Beta CAE Systems, USA, based in Farmington Hills, Michigan.

ANSA maintains the association between CAD geometry and the FE mesh. This means that the FE meshes are better representations of their geometric parents. Also it is easy to maintain and update any changes in the geometry by simply reworking the updated area instead of recreating the FE from scratch.

It carries several proprietary algorithms for meshing suitable for both CFD and structural models. ANSA was initially standing for 'Automatic net generation for structural analysis', but the software has gone beyond that very quickly. ANSA has broadly six menus which are used to do various activities those are: TOPO MESH, VMESH ,DECK-SOLVER, MORPH ,HBLOCK.

(source:wiki)

 

Different Type of Modules in ANSA:-

  • TOPO - Set of tools for Geometry clean-up and for setting up of PIDs.
  • MESH - Tools to generate Surface Mesh or 2D Mesh.
  • VOLUME MESH - To generate solid or 3D Mesh.
  • DECKS - Tools based on different solvers such as ABAQUS, RADIOSS, ANSYS etc.
  • MORPH - Advanced tool to capture geometry more accurately while meshing.

CROSS - Tools to define Cross Section.

 

STEPS:-

  • Import the CAD model.
  • Display set-up.
  • Geometry check-up.
  • Setting-up of relevant PIDs.
  • Defining the element size or length.
  • Selection of Meshing type.
  • Generating Mesh.

PROCEDURE:-

1). IMPORTING OF CAD MODEL

On Importing the CAD model ,We are able to see the WireFrame model in the Drawing Area.

Go to file > Open > Browse the  location of the CAD model > Select it click on Enter.

 

2). Display set-up

The model which we have imported opens in wireframe mode. Inorder to use it we need to set it right for use.

Bottom Tool Bar > Shadow Mode > Drawing Mode > PID

 

 

The Edges cannot be visible in this mode. Inorder to display that 

Toolbar > Quality Criteria > Presentation Parameter > Select Draw CONS IN PID,MID,...like in ENT mode > Apply > OK.

3). Geometry check-up:-

Geometry check-up is done to check whether there are any errors in the model like Unclosed faces, Super Imposing faces, etc..

Toolbar > checks > Geometry > Visible > Execute > Check for the green tick beside geometry > close the window.

4). Setting-up of Relevant PIDs.

This is done to specify different boundary conditions for various parts.

We need to Activate Cross Hatches before setting-up PIDs.

Now go to TOPO utility window on the right side of the window.

Faces > Set PIDs > Faces/shells > click on the cross hatches to select the face > Enter > New > Name the selection > Repeat it for all the model for various selection.

After Setting-up of all PIDs The model will look as below

5). Defining the Element size/Length.

Here we will define Element size or Mesh.

Go to mesh utility > Perimeters > length > Click Left mouse button > Drag and select the entire model > Click enter > Enter the element length as 1 > Click Enter.

6). Selection of Meshing type & Generating Mesh.

Here we will select the Meshing algorithm.

Go to Mesh Generation > Spot Mesh > Tria > Drag and select the entire model > Click on the scroll button on mouse to mesh.

The model after mesh looks like below. we will get a better visual by zooming in the model.

 

CONCLUSION:-

  • The given CAD geometry was sucessfully Inspected for Any Geometrical Errors.
  • Group of Faces were Assigned PIDs based on boundary conditions.
  • The surface mesh model of tria elements was generated having element length of 1 unit.
  • Smaller element captures curvature of  geometry more accurately.

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