WS17-1 WORKSHOP 17 IMPORT IGES FILE AND AUTO-TET MESH THE GEOMETRY NAS104, Workshop 17, March 2004 Copyright 2004 MSC.Software Corporation

WS17-2 NAS104, Workshop 17, March 2004 Copyright 2004 MSC.Software Corporation

WS17-3 NAS104, Workshop 17, March 2004 Copyright 2004 MSC.Software Corporation n Problem Description u Create a simple 3D model with fixed temperature and convection coefficient boundary conditions. The emphasis for this workshop is importing surfaces using an IGES file, creating a B-rep geometric solid from the imported surfaces, and creating a tetrahedral Tet10 mesh using the tet-mesher TetMesh. u The fixed temperature, 70 F, is to be applied at the base of the model(blade). The fixed coefficient convection, h=10, is to be off the blade surfaces, and to the ambient temperature of 1000 F. A steady-state thermal analysis is to be performed. Obtain the temperature contour plot from the results.

WS17-4 NAS104, Workshop 17, March 2004 Copyright 2004 MSC.Software Corporation n Suggested Exercise Steps 1. Create a new database. 2. Use MSC.Nastran Thermal 3. Import the IGES file with surfaces 4. Create B-rep solid from the imported surfaces 5. TetMesh the solid with Tet10 elements 6. Define thermal material 7. Define 3D element property 8. Apply boundary temperature at base 9. Apply convection to ambient temperature 10. Display all boundary conditions 11. Perform the thermal analysis 12. Run MSC.Nastran 13. Attach the results file 14. Display the temperature results 15. Quit MSC.Patran

WS17-5 NAS104, Workshop 17, March 2004 Copyright 2004 MSC.Software Corporation Step 1: Create a New Database Create a new database. a.File: New b.Enter iges_tetmesh for File name. c.Click OK. c a b

WS17-6 NAS104, Workshop 17, March 2004 Copyright 2004 MSC.Software Corporation Step 2: Use MSC.Nastran Thermal Specify the thermal solver. a.Select Default for Tolerance. b.Select MSC.Nastran for Analysis Code. c.Select Thermal for Analysis Type. d.Click OK. c a b d

WS17-7 NAS104, Workshop 17, March 2004 Copyright 2004 MSC.Software Corporation Step 3: Import the IGES File With Surfaces Import the IGES file. a.File: Import… b.Select Model for Object. c.Select IGES for Source. d.Select mblade.igs for File name. e.Click Apply. d b c e a

WS17-8 NAS104, Workshop 17, March 2004 Copyright 2004 MSC.Software Corporation Step 4: Create B-rep Solid From the Imported Surfaces Create a B-rep solid from the surfaces. a.Geometry: Create/Solid/B-rep b.Select all the surfaces for Surface List. c.Click Apply c a b

WS17-9 NAS104, Workshop 17, March 2004 Copyright 2004 MSC.Software Corporation Step 5: TetMesh the Solid With Tet10 Elements Mesh the B-rep solid. a.Elements: Create/Mesh/Solid b.Select Tet for Elem Shape. c.Select TetMesh for Mesher d.Select Tet10 for Topology. e.Select Solid 1 for Input List. f.Click Apply c a b f d e

WS17-10 NAS104, Workshop 17, March 2004 Copyright 2004 MSC.Software Corporation Step 6: Define Thermal Material Define material property. a.Materials: Create/Isotropic/Manual Input. b.Enter Titan for Material Name. c.Click Input Properties… d.Enter for Thermal Conductivity. e.Click OK. f.Click Apply. c a b f d e

WS17-11 NAS104, Workshop 17, March 2004 Copyright 2004 MSC.Software Corporation Step 7: Define 3D Element Property Define the property for the solid elements. a.Properties: Create/3D/Solid. b.Enter Solid for Property Set Name. c.Click Input Properties… d.Click in Material Name and select Titan under Material Property Sets. e.Click OK f.Enter Solid 1 for Select Members. g.Click Add. h.Click Apply. c a b g h f d e

WS17-12 NAS104, Workshop 17, March 2004 Copyright 2004 MSC.Software Corporation Step 8: Apply Boundary Temperature at Base Apply temperature at base of blade(fin). a.Loads/BCs: Create/Temp/Nodal. b.Enter base_temp for New Set Name. c.Click Input Data… d.Enter 70 for Boundary Temperature. e.Click OK. f.Click Select Application Region… g.Select Surface 3 5 for Select Geometry Entities. h.Click Add. i.Click OK. j.Click Apply. c a b j i g h f d e

WS17-13 NAS104, Workshop 17, March 2004 Copyright 2004 MSC.Software Corporation Step 9: Apply Convection to Ambient Temperature Apply convection with ambient temperature. a.Loads/BCs: Create/Convection/Element Uniform. b.Select To Ambient for Option. c.Enter convection for New Set Name. d.Select 3D for Target Element Type. e.Click Input Data. f.Enter 10 for Convection Coefficient. g.Enter 1000 for Ambient Temperature. h.Click OK. i.Click Select Application Region.. j.Select Solid for Select Solid Faces. k.Click Add l.Click OK. m.Click Apply c a b l j k i g h f d e m

WS17-14 NAS104, Workshop 17, March 2004 Copyright 2004 MSC.Software Corporation Step 10: All Boundary Conditions

WS17-15 NAS104, Workshop 17, March 2004 Copyright 2004 MSC.Software Corporation Step 11: Perform the Thermal Analysis Perform the heat transfer analysis. a.Analysis: Analyze/Entire Model/Analysis Deck b.Use iges_tetmesh for Job Name. c.Click Apply. c a b

WS17-16 NAS104, Workshop 17, March 2004 Copyright 2004 MSC.Software Corporation Step 12: Run MSC.Nastran a.Run MSC.Nastran b.Select iges_tetmesh.bdf c.Click Open. d.Click Run c a b d

WS17-17 NAS104, Workshop 17, March 2004 Copyright 2004 MSC.Software Corporation Step 13: Attach the Results File Attach the XDB file. a.Analysis: Attach XDB/ResultEntities/Local b.Click Select Results File… c.Select iges_tetmesh.xdb for File name. d.Click OK. e.Click Apply. c a b d e

WS17-18 NAS104, Workshop 17, March 2004 Copyright 2004 MSC.Software Corporation Step 14: Display the Temperature Results Display the temperature results. a.Results: Create/Quick Plot. b.Select SC1 DEFAULT.. For Select Result Cases c.Select Temperature for Select Fringe Result d.Click Apply. c a b d

WS17-19 NAS104, Workshop 17, March 2004 Copyright 2004 MSC.Software Corporation Step 15: Quit MSC.Patran Quit MSC.Patran a.Select File on the Menu Bar and select Quit from the drop down menu a

WS17-20 NAS104, Workshop 17, March 2004 Copyright 2004 MSC.Software Corporation