Computer Aided Thermal Computer Aided Thermal Fluid AnalysisFluid Analysis

Lecture 6Lecture 6

Dr. Ming-Jyh ChernDr. Ming-Jyh ChernME 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 CAD/STAR-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 Grids” 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. ADesign a 3-D irregular block and mesh the block. An orthogonaliser must be used for the block.n orthogonaliser must be used for the block.• Design a case which includes two cylindrical blockDesign a case which includes two cylindrical blocks to use integral couple.s to use integral couple.• Design a case, which includes two cylindrical blocDesign a case, which includes two cylindrical blocks perpendicular to each other, to use arbitrary coks perpendicular to each other, to use arbitrary couple.uple.• Due date: 24 April, 2006.Due date: 24 April, 2006.

Mesh and Geometry Mesh and Geometry CheckingChecking

Macroscopic CheckingMacroscopic Checking