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Comprehensive Guide to STAR-CD Thermal Fluid Analysis: Process and Tools

This lecture details the roadmap for initializing and effectively using STAR-CD for thermal fluid analysis. Dr. Ming-Jyh Chern outlines the four major modeling processes: working out a modeling strategy, preprocessing with PROSTAR, performing flow analysis using STAR, and post-processing results. Learn about essential tools such as the STAR-CD Launcher and Exceed for image transformation, as well as how to create computational meshes and specify thermophysical properties. Gain insights into command structures and vertex generation to optimize your analysis workflow.

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Comprehensive Guide to STAR-CD Thermal Fluid Analysis: Process and Tools

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Presentation Transcript

  1. Computer Aided Thermal Fluid AnalysisLecture 2 Dr. Ming-Jyh Chern ME NTUST

  2. Road Map for Today • How to initialize STAR-CD? • Four major modeling processes. • Usage of SET • Generation of Vertices

  3. prostar - Exceed • STAR-CD was coded under an X-window environment. • To run STAR-CD in MS Window, a program to transform images given by STAR-CD is necessary. • Exceed is able to reach this goal. You need to run exceed before the usage of STAR-CD.

  4. STAR-CD Launcher

  5. prostar - Exceed

  6. prostar

  7. Command Window

  8. STAR-GUIDE

  9. Quit from STAR-CD

  10. Four Major Modeling Process • Phase 1 – Working out a modeling strategy • Phase 2 – Preprocessing - Setting up the flow model using PROSTAR • Phase 3 – Solver - Performing the flow analysis using STAR • Phase 4 – Post-processing the results using PROSTAR

  11. Phase 1 – Working out a Modeling Strategy • Planning the computational mesh • Looking up numerical values for appropriate physical parameters • Choosing the most suitable modeling option from what is available.

  12. Phase 2 – Setting Up the Flow Model Using Prostar • Creating a computational mesh to represent the flow domain. • Specifying the thermophysical properties of the fluids and/or solids. • Setting the solution parameters and output data formats. • Specifying the location and definition of boundaries and time increment. • Writing appropriate data files.

  13. Phase 3 – Performing the Flow Analysis Using Prostar • Reading input data created by Prostar and, if dealing with a restart run, the results of a previous run. • Judging the progress of the run by analysing various monitoring data and solution statistics provided by STAR.

  14. Phase 4 – Post-processing the results Using Prostar • Display and visualize the obtained results. • Plot velocity vector fields. • Plot contours regarding pressure, density and so on. • Plot curves regarding variation of flow fields.

  15. STAR-CD System Structure

  16. Pro-STAR

  17. STAR

  18. Files in STAR-CD

  19. Usage of Mouse • Left bottom – Rotation • Middle bottom (or Left+Right bottoms) – Zoom • Right bottom - Move

  20. Basic Elements • Cell • Vertex • Boundary • Block • Couple • Spline • Droplet

  21. Concept of Set • Every command or action in STAR-CD only affects elements in a set. Before you give a command, you’d better select the elements which you want to modify. • The range of a set can be checked via “List” in Prostar.

  22. When set is used? • Plot results • Establish model • Check model • Post-processing

  23. Common sets • cset: Cell set • vset: Vertex set • bset: Boundary set • splset: Spline set • Blkset: Block set

  24. Coordinates • Global coordinate • Local coordinate • Cartesian coordinate • Cylindrical coordinate • Spherical coordinate

  25. Coordinates • Change or view setting of coordinate system from STAR GUIde. • Create and Import Geometry->Create Geometric Entities-> find vertices in the yellow part-> click the icon near “Current Coordinate System”

  26. Coordinates Current system

  27. Command For Vertex Generation • Before you generate a vertex, you’d better to check which coordinate you use. • v,1,0,0,5 • v,2 ,10,0,0 • vset,all • vplot

  28. Alternative Way to Generate a Vertex

  29. Vertex List • Find vertex list from the item “Vertices” of “Lists” in Prostar

  30. Vertex Tool • Find vertex tool from the item “Vertex Tool” of “Tools” in Prostar

  31. Vertex Tool

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