Microsoft PowerPoint - How can Fluent Help us

Microsoft PowerPoint - How can Fluent Help us - How How can...

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Unformatted text preview: How How can Fluent Help us Course By : Prof. Hosseini prepared by: S.M. rafigh 2011 Solution Solution Parameters Choosing Choosing the Solver Discretization Discretization Schemes Initialization Initialization Convergence Convergence Monitoring Monitoring Convergence Stability Stability Setting Under-relaxation ○ UnderSetting Courant number ○ Accelerating Accelerating Convergence Accuracy Accuracy Grid Grid Independence Adaptation Adaptation Set Solution Parameters Initialize Enable Solution Monitors Calculate a Solution Modify the Solution Parameters or the Mesh Converged? Yes No Accurate? No Yes Stop Menu is laid out such that order of operation is generally left to right. Import Import (scale) the mesh file Select Select physical models Define Define material properties Prescribe Prescribe operating conditions conditions Prescribe Prescribe boundary conditions Provide Provide an initial solution Set Set solver controls Set Set up convergence monitors Compute Compute and monitor solution Mouse Mouse button functionality depends on solver and can be configured in the solver Display Menu→ Mouse Buttons... Default Default Settings: 2D Solver Left button translates (dolly) ○ Middle button zooms ○ Right button selects/probes ○ 3D Solver Left button rotates about 2-axes ○ Middle button zooms ○ Right button selects/probes ○ Components Components are defined in preprocessor Cell Cell = control volume into which domain is broken up computational domain is defined by ○ mesh that represents the fluid and solid regions of interest. Face Face = boundary of a cell Edge Edge = boundary of a face Node Node = grid point Zone Zone = group of nodes, faces, and/or cells Boundary data assigned to face ○ zones. Material data and source terms ○ assigned to cell zones. node cell center face cell 2D mesh node edge face 3D mesh cell How How to… File File Menu → Read → Case Fluent Fluent assumes that all physical dimensions are initially in meters meters. The The default unit system in Fluent is Metric (SI) units. How How to… Grid Grid Menu → Check Grid Grid Menu → Scale Grid Grid Menu → Translate How How to… Display Display Menu → Grid How How to… Define Define Menu → Models → Solver Define Define Menu → Models → Viscous How How to… Define Define Menu → Materials → Fluent Database Physical Physical models may require additional material properties need to be defined. Multiple Multiple Species (Single Phase) Flows Mixture Material concept employed employed Single Single-Phase, Single Mixture Mixture properties Species Species Flows (composition Define Define fluid/solid dependent) properties defined separately Real Real gas model from constituent’s Multiple Multiple Phase Flows properties. (Single Species) Component Component properties Define Define properties for must be defined. all all fluids and solids. How How to… Define Define Menu → Materials → Fluent Database To To formulate a problem that results in a unique solution, unique the relevant variables at the domain boundaries must be defined. Specifying velocity, temperature and pressure or fluxes of mass, momentum, energy. Defining Defining boundary conditions involves: identifying the location of the boundaries (e.g., inlets, .i walls, symmetry) supplying information at the boundaries .ii Define Define Menu → Boundary Conditions → Select Zones How How to… Boundary Boundary Condition Types of External Faces External General: General: Pressure inlet, Pressure outlet Incompressible: Incompressible: Velocity inlet, Outflow Compressible Compressible flows: Mass flow inlet, Pressure farfarfield Special: Special: Inlet vent, outlet vent, intake fan, exhaust fan Other: Other: Wall, Symmetry, Periodic, Axis Boundary Boundary Condition Types of Cell ‘Boundaries’ Cell Fluid Fluid and Solid Boundary Boundary Condition Types of Double-Sided Face Double‘Boundaries’ Fan, Fan, Interior, Porous Jump, Radiator, Walls How How to… Define Define Menu → Boundary Conditions → Select Zones How How to… Solve Solve Menu → Initialize → Initialize How How to… Solve Solve Menu → Monitors → Residuals The The convergence of solution solution can also be changed changed How How to… Solve Solve Menu → Iterate → Iterate How How to… Display Display Menu → Contours Display Display Menu → Vectors Flow Flow in a Channel Steady Steady State Inlet Inlet Velocity is known Outlet Outlet is open to atmospheric pressure No No Slip on all walls Fluid Fluid is Water Desired Desired Grid Resolution is 1500 Hexahedral Cells x-Velocity = 0.85 m/s y-Velocity = 0.00 m/s Outflow 15cm 60cm ...
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This note was uploaded on 06/21/2011 for the course ME 20345 taught by Professor Prof. hosseini during the Fall '10 term at Sharif University of Technology.

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