Computer Aided Thermal Computer Aided Thermal Fluid AnalysisFluid Analysis

Lecture 6Lecture 6

Dr. Ming-Jyh ChernDr. Ming-Jyh Chern

ME NTUSTME NTUST

Road Map for TodayRoad Map for Today

• Importing mesh data from other Importing mesh data from other systemssystems

• Exporting mesh data Exporting mesh data

• Mesh structureMesh structure

• Mesh operationMesh operation

• User Guide Chapter 4User Guide Chapter 4

Importing Mesh Data from Importing Mesh Data from Other SystemOther System• STAR-CD can use mesh files generated by other CADSTAR-CD can use mesh files generated by other CAD

/CAE softwares./CAE softwares.• Acceptable CAD/CAE files:Acceptable CAD/CAE files:

– SAMMSAMM– ICEM CFDICEM CFD– IDEASIDEAS– ANSYSANSYS– PATRANPATRAN– NASTRANNASTRAN– PLOT3D PLOT3D

How to import mesh files in How to import mesh files in STAR-CDSTAR-CD• Using the “Import GriUsing the “Import Gri

ds” STAR GUIde paneds” STAR GUIde panel.l.

• Surface data are impoSurface data are imported using the “Imporrted using the “Import CAD/Surface Informat CAD/Surface Information”tion”

Exporting Mesh DataExporting Mesh Data

• Prostar can export mesh data to other CAD/CProstar can export mesh data to other CAD/CAE.AE.

• Types of Prostar provides:Types of Prostar provides:– ANSYSANSYS– PATRANPATRAN– NASTRANNASTRAN– IDEASIDEAS– ENSIGHTENSIGHT– FIELDVIEWFIELDVIEW

How to export mesh data in PrHow to export mesh data in Prostarostar• Using the “Export Grids” STAR GUIde Using the “Export Grids” STAR GUIde

panel.panel.

Mesh ConnectivitiesMesh Connectivities

• When we use multi-When we use multi-block method to block method to construct mesh, there construct mesh, there are connection are connection problems appearing problems appearing between blocks.between blocks.

• Regular connectivityRegular connectivity• Integral connectivityIntegral connectivity• Arbitrary connectivityArbitrary connectivity

Regular ConnectivityRegular Connectivity

• Discontinuities Discontinuities must be removed must be removed by merging by merging coincident vertices coincident vertices at the interfaces at the interfaces between adjacent between adjacent blocks.blocks.

• One-to-one One-to-one connection.connection.

Couple GenerationCouple Generation

• Tools>Couple ToolTools>Couple Tool

• Manually - only to Manually - only to integral couplesintegral couples

• Automatically – to Automatically – to integral matching integral matching or arbitrary or arbitrary matchingmatching

Manual CouplingManual Coupling

Automatic CouplingAutomatic Coupling

Usage of COUPLE SETUsage of COUPLE SET

• Integral or ArbitraryIntegral or Arbitrary

Couple - IntegralCouple - Integral

Couple - IntegralCouple - Integral

Couple - IntegralCouple - Integral

Integral ConnectivityIntegral Connectivity

Couple-ArbitraryCouple-Arbitrary

Couple-ArbitraryCouple-Arbitrary

Couple-ArbitraryCouple-Arbitrary

Arbitrary connectivityArbitrary connectivity

Arbitrary connectivityArbitrary connectivity

Arbitrary connectivityArbitrary connectivity

Arbitrary connectivityArbitrary connectivity

Homework 3 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. Design a 3-D irregular block and mesh the block.

An orthogonaliser must be used for the block.An orthogonaliser must be used for the block.• Design a case which includes two cylindrical blocDesign a case which includes two cylindrical bloc

ks to use integral couple.ks to use integral couple.• Design a case, which includes two cylindrical blocDesign a case, which includes two cylindrical bloc

ks perpendicular to each other, to use arbitrary cks perpendicular to each other, to use arbitrary couple.ouple.

• Due date: 24 April, 2006.Due date: 24 April, 2006.

Mesh and Geometry Mesh and Geometry CheckingChecking

Macroscopic CheckingMacroscopic Checking