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Computer Aided Thermal Fluid Analysis Lecture 2. Dr. Ming-Jyh Chern ME NTUST. Road Map for Today. How to initialize STAR-CD? Four major modeling processes. Usage of SET Generation of Vertices. prostar - Exceed. STAR-CD was coded under an X-window environment.
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Computer Aided Thermal Fluid AnalysisLecture 2 Dr. Ming-Jyh Chern ME NTUST
Road Map for Today • How to initialize STAR-CD? • Four major modeling processes. • Usage of SET • Generation of Vertices
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.
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
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.
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.
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.
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.
Usage of Mouse • Left bottom – Rotation • Middle bottom (or Left+Right bottoms) – Zoom • Right bottom - Move
Basic Elements • Cell • Vertex • Boundary • Block • Couple • Spline • Droplet
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.
When set is used? • Plot results • Establish model • Check model • Post-processing
Common sets • cset: Cell set • vset: Vertex set • bset: Boundary set • splset: Spline set • Blkset: Block set
Coordinates • Global coordinate • Local coordinate • Cartesian coordinate • Cylindrical coordinate • Spherical coordinate
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”
Coordinates Current system
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
Vertex List • Find vertex list from the item “Vertices” of “Lists” in Prostar
Vertex Tool • Find vertex tool from the item “Vertex Tool” of “Tools” in Prostar
