Computer Aided Thermal Fluid Analysis Lecture 6 Dr. Ming-Jyh Chern ME NTUST

Road Map for Today Importing mesh data from other systems Importing mesh data from other systems Exporting mesh data Exporting mesh data Mesh structure Mesh structure Mesh operation Mesh operation User Guide Chapter 4 User Guide Chapter 4

Importing Mesh Data from Other System STAR-CD can use mesh files generated by other CAD/CAE softwares. STAR-CD can use mesh files generated by other CAD/CAE softwares. Acceptable CAD/CAE files: Acceptable CAD/CAE files: – SAMM – ICEM CFD – IDEAS – ANSYS – PATRAN – NASTRAN – PLOT3D

How to import mesh files in STAR-CD Using the “Import Grids” STAR GUIde panel. Using the “Import Grids” STAR GUIde panel. Surface data are imported using the “Import CAD/Surface Information” Surface data are imported using the “Import CAD/Surface Information”

Exporting Mesh Data Prostar can export mesh data to other CAD/CAE. Prostar can export mesh data to other CAD/CAE. Types of Prostar provides: Types of Prostar provides: – ANSYS – PATRAN – NASTRAN – IDEAS – ENSIGHT – FIELDVIEW

How to export mesh data in Prostar Using the “Export Grids” STAR GUIde panel. Using the “Export Grids” STAR GUIde panel.

Mesh Connectivities When we use multi- block method to construct mesh, there are connection problems appearing between blocks. When we use multi- block method to construct mesh, there are connection problems appearing between blocks. Regular connectivity Regular connectivity Integral connectivity Integral connectivity Arbitrary connectivity Arbitrary connectivity

Regular Connectivity Discontinuities must be removed by merging coincident vertices at the interfaces between adjacent blocks. Discontinuities must be removed by merging coincident vertices at the interfaces between adjacent blocks. One-to-one connection. One-to-one connection.

Couple Generation Tools>Couple Tool Tools>Couple Tool Manually - only to integral couples Manually - only to integral couples Automatically – to integral matching or arbitrary matching Automatically – to integral matching or arbitrary matching

Manual Coupling

Automatic Coupling

Usage of COUPLE SET Integral or Arbitrary Integral or Arbitrary

Couple - Integral

Integral Connectivity

Couple-Arbitrary

Couple-Arbitrary

Couple-Arbitrary

Arbitrary connectivity

Homework 3 Purpose: Practice the usages of block and couple. Purpose: Practice the usages of block and couple. Design a 3-D irregular block and mesh the block. An orthogonaliser must be used for the block. Design a 3-D irregular block and mesh the block. An orthogonaliser must be used for the block. Design a case which includes two cylindrical blocks to use integral couple. Design a case which includes two cylindrical blocks to use integral couple. Design a case, which includes two cylindrical blocks perpendicular to each other, to use arbitrary couple. Design a case, which includes two cylindrical blocks perpendicular to each other, to use arbitrary couple. Due date: 24 April, Due date: 24 April, 2006.

Mesh and Geometry Checking

Macroscopic Checking