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Fluent Solutions for Mechanical and Aeronautical Engineering Simulations

Discover the essential aspects of utilizing Fluent software for mechanical and aeronautical engineering simulations. Learn about setting solution parameters, initializing solutions, convergence monitoring, solver controls, boundary conditions, and more. This overview covers key functionalities and processes within the Fluent software platform.

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Fluent Solutions for Mechanical and Aeronautical Engineering Simulations

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  1. Fluent Overview Goodarz Ahmadi and Kambiz Nazridoust Department of Mechanical and Aeronautical Engineering Clarkson University Potsdam, NY 13699-5725

  2. Run Fluent

  3. Set Solution Parameters Initialize Enable Solution Monitors Calculate a Solution Modify the Solution Parameters or the Mesh Converged? No Yes Accurate? No Stop Yes Solution Procedure Overview • Solution Parameters • Choosing the Solver • Discretization Schemes • Initialization • Convergence • Monitoring Convergence • Stability • Setting Under-relaxation • Setting Courant number • Accelerating Convergence • Accuracy • Grid Independence • Adaptation

  4. Solver Overview Menu is laid out such that order of operation is generally left to right. • Import (scale) the mesh file • Select physical models • Define material properties • Prescribe operating conditions • Prescribe boundary conditions • Provide an initial solution • Set solver controls • Set up convergence monitors • Compute and monitor solution

  5. Mouse Functionality • Mouse button functionality depends on solver and can be configured in the solver Display Menu Mouse Buttons... • 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

  6. node face cell 2D mesh node edge cell face 3D mesh Mesh Components • Components are defined in preprocessor • 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 = boundary of a cell • Edge = boundary of a face • Node = grid point • Zone = group of nodes, faces, and/or cells • Boundary data assigned to face zones. • Material data and source terms assigned to cell zones. cell center

  7. Reading a Mesh File How to… • File Menu  Read  Case

  8. Check/Scale/Translate Mesh • Fluent assumes that all physical dimensions are initially in meters. • The default unit system in Fluent is Metric (SI) units. How to… • Grid Menu  Check • Grid Menu  Scale • Grid Menu  Translate

  9. View Grid How to… • Display Menu  Grid

  10. Define Models How to… • Define Menu  Models  Solver • Define Menu  Models  Viscous

  11. Define Materials How to… • Define Menu  Materials  Fluent Database • Physical models may require additional material properties need to be defined. • Single-Phase, Single Species Flows • Define fluid/solid properties • Real gas model • Multiple Phase Flows (Single Species) • Define properties for all fluids and solids. • Multiple Species (Single Phase) Flows Mixture Material concept employed • Mixture properties (composition dependent) defined separately from constituent’s properties. • Component properties must be defined.

  12. Define Materials How to… • Define Menu  Materials  Fluent Database

  13. Define Boundary Conditions • To formulate a problem that results in a unique solution, the relevant variables at the domain boundaries must be defined. Specifying velocity, temperature and pressure or fluxes of mass, momentum, energy. • Defining boundary conditions involves: • identifying the location of the boundaries (e.g., inlets, walls, symmetry) • supplying information at the boundaries

  14. Define Boundary Conditions How to… Define Menu  Boundary Conditions  Select Zones • Boundary Condition Types of External Faces • General: Pressure inlet, Pressure outlet • Incompressible: Velocity inlet, Outflow • Compressible flows: Mass flow inlet, Pressure far-field • Special: Inlet vent, outlet vent, intake fan, exhaust fan • Other: Wall, Symmetry, Periodic, Axis • Boundary Condition Types of Cell ‘Boundaries’ • Fluid and Solid • Boundary Condition Types of Double-Sided Face ‘Boundaries’ • Fan, Interior, Porous Jump, Radiator, Walls

  15. Define Boundary Conditions How to… Define Menu  Boundary Conditions  Select Zones

  16. Initialization How to… • Solve Menu  Initialize  Initialize

  17. Solution Monitoring How to… • Solve Menu  Monitors  Residuals • The convergence of solution can also be changed

  18. Solve How to… • Solve Menu  Iterate  Iterate

  19. Post-Processing How to… • Display Menu  Contours • Display Menu  Vectors

  20. x-Velocity = 0.85 m/s y-Velocity = 0.00 m/s Outflow 15cm 60cm Practice Example Flow in a Channel • Steady State • Inlet Velocity is known • Outlet is open to atmospheric pressure • No Slip on all walls • Fluid is Water • Desired Grid Resolution is 1500 Hexahedral Cells

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