© Fluent Inc. 4/20/2005 2-1 Introductory FLUENT Notes FLUENT v6.1 Feb 2003 Fluent User Services Center www.fluentusers.com Main Menu bar Global Control Operation toolpad Command line Description window Graphical User Interface (GUI)
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© Fluent Inc. 4/20/20052-1
Introductory FLUENT NotesFLUENT v6.1 Feb 2003
Fluent User Services Center
www.fluentusers.com
Main Menu bar
Global Control
Operation toolpad
Command line Description window
Graphical User Interface (GUI)
© Fluent Inc. 4/20/20052-2
Introductory FLUENT NotesFLUENT v6.1 Feb 2003
Fluent User Services Center
www.fluentusers.com
Topology in GambitVolume
meshFace mesh
Edgemesh
Volume
Faces
EdgeVertex
© Fluent Inc. 4/20/20052-3
Introductory FLUENT NotesFLUENT v6.1 Feb 2003
Fluent User Services Center
www.fluentusers.com
Geometry Creation
© Fluent Inc. 4/20/20052-4
Introductory FLUENT NotesFLUENT v6.1 Feb 2003
Fluent User Services Center
www.fluentusers.com
Geometry CreationACIS - geometry engine ("kernel")
Provides tools for “bottom-up” creation by:Vertex: Add, Grid Snap, etc.Edge: Line, Arc, Ellipse, Fillet, B-spline, etc.Face: Wire Frame, Sweep, Net, etc.Volume: Wire Frame, Sweep, Face Stitch, etc.
Provides tools for “top-down” creation byFace Primitives: Rectangle, Circle, EllipseVolume Primitives: Brick, Cylinder, Sphere, etc.Volume/Face Booleans: Unite, Subtract, IntersectVolume/Face Decompose: Split
Geometry creation typically involves use of all tools.
© Fluent Inc. 4/20/20052-5
Introductory FLUENT NotesFLUENT v6.1 Feb 2003
Fluent User Services Center
www.fluentusers.com
Geometry Creation (3)Color Identification
Connected Vertices and Edges are colored according to the highest order entity to which they are connected. To.The coloring scheme is:
Vertex (white)Edge (yellow)Face (light blue)Volume (green)
Undo/Redo:10 levels of undo by default.
Undoes geometry, meshing, and zoning commands.Description window provides command to be undone when mouse is passed over undo button.
Left click to execute visible button operation.Right click to access options.
© Fluent Inc. 4/20/20052-6
Introductory FLUENT NotesFLUENT v6.1 Feb 2003
Fluent User Services Center
www.fluentusers.com
Mesh Generation
© Fluent Inc. 4/20/20052-7
Introductory FLUENT NotesFLUENT v6.1 Feb 2003
Fluent User Services Center
www.fluentusers.com
Design and Create the Grid
quadrilateraltriangleQuad/hex or tri/tet?
Grid resolution?
Sufficient computer memory?hexahedrontetrahedron
prism/wedgepyramid
© Fluent Inc. 4/20/20052-8
Introductory FLUENT NotesFLUENT v6.1 Feb 2003
Fluent User Services Center
www.fluentusers.com
Edge MeshingEdge meshing form
Picking
GradingSingle-sided gradingSymmetric gradingAsymmetric grading
SpacingInterval Count% of edge lengthInterval Sice
Special characteristicsOptions
© Fluent Inc. 4/20/20052-9
Introductory FLUENT NotesFLUENT v6.1 Feb 2003
Fluent User Services Center
www.fluentusers.com
Face Meshing - Quad Examples
Quad: Map
Quad: Submap
Quad: Tri-Primitive
Quad: Pave
© Fluent Inc. 4/20/20052-10
Introductory FLUENT NotesFLUENT v6.1 Feb 2003
Fluent User Services Center
www.fluentusers.com
Volume Meshes - Hex ExamplesHex: Map
Hex: Submap
Hex: Tet-Primitive
Hex: Cooper
Hex: Stairstep
© Fluent Inc. 4/20/20052-11
Introductory FLUENT NotesFLUENT v6.1 Feb 2003
Fluent User Services Center
www.fluentusers.com
Inputs to the Solver
GUI commands have a corresponding TUI command.Journal/Transcript write capability.
© Fluent Inc. 4/20/20052-12
Introductory FLUENT NotesFLUENT v6.1 Feb 2003
Fluent User Services Center
www.fluentusers.com
Topology in FluentCell = control volume Face = boundary of a cellEdge = boundary of a faceNode = grid pointZone = grouping of
nodes, faces, and/or cellsBoundary data => face zones.Material data and source terms => cell zones.
node
face
cell
cell center
Simple 2D mesh
face cell
node
edge
Simple 3D mesh
© Fluent Inc. 4/20/20052-13
Introductory FLUENT NotesFLUENT v6.1 Feb 2003
Fluent User Services Center
www.fluentusers.com
Reading Mesh: Zones
inlet
outlet
wall
orifice(interior)
orifice_plate and orifice_plate-shadow
Fluid (cell zone)
Default-interior is zone of internal cell faces (not used).
Example: Face and cell zones associated with Pipe Flow through orifice plate.
© Fluent Inc. 4/20/20052-14
Introductory FLUENT NotesFLUENT v6.1 Feb 2003
Fluent User Services Center
www.fluentusers.com
Fluid Flow and Heat TransferMomentum, Continuity, and Energy EquationsRadiation Models
TurbulenceRANS based models including k-ε, k-ω, and RSM.LES
Species TransportVolumetric Reactions
Arrhenius finite-rate chemistryTurbulent fast chemistry
Eddy Dissipation, Non-Premixed, Premixed, Partially premixed
Turbulent finite-rate chemistryEDC, laminar flamelet
Surface Reactions
Models in Fluent 6 (1)
Pressure contours in near ground flight
Temperature contours for kiln burner retrofitting.
© Fluent Inc. 4/20/20052-15
Introductory FLUENT NotesFLUENT v6.1 Feb 2003
Fluent User Services Center
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Multiphase FlowsDiscrete Phase Model (DPM)Volume of Fluid (VOF) model for immiscible fluidsMixture ModelEulerian-Eulerian and Eulerian-Granular ModelsLiquid/Solid and Cavitation Phase Change Models
Flows involving Moving PartsMoving zones
Single/Multiple Rotating Reference FramesMixing Plane ModelSliding Mesh Model
Moving and Deforming MeshUser-Defined Scalar Transport
Models in Fluent 6 (2)Gas outlet
Oil outlet
Inlet
Water outletContours of oil volume fraction in three phase separator.
Pressure contours for squirrel cage blower.
© Fluent Inc. 4/20/20052-16
Introductory FLUENT NotesFLUENT v6.1 Feb 2003
Fluent User Services Center
www.fluentusers.com
Solver Enhancements: Grid AdaptionGrid adaption increases cell resolution in FluentFluent adapts on cells listed in register.
© Fluent Inc. 4/20/20052-17
Introductory FLUENT NotesFLUENT v6.1 Feb 2003
Fluent User Services Center
www.fluentusers.com
Solver Enhancements: Parallel Solver
With 2 or more processes, Fluent can be run on multiple processors.Multiprocessor machine, or network of machines.Mesh can be partitioned manually or automatically.
Partitioned grid for multi-element airfoil.
© Fluent Inc. 4/20/20052-18
Introductory FLUENT NotesFLUENT v6.1 Feb 2003
Fluent User Services Center
www.fluentusers.com
Choosing a Solver
The Segregated (implicit) solver should be first choiceLess memory.Flexibility.
The Coupled solvers are recommended if a strong inter-dependence exists between density, energy, momentum, and/or species.
Coupled-Implicit solver is recommended.Coupled-Explicit solver only for unsteady flows with time scale around acustictime scale e.g., tracking transient shock wave
© Fluent Inc. 4/20/20052-19
Introductory FLUENT NotesFLUENT v6.1 Feb 2003
Fluent User Services Center
www.fluentusers.com
Discretization (Interpolation Methods)Interpolation schemes for the convection term:
First-Order Upwind SchemePower Law SchemeSecond-Order Upwind SchemeQuadratic Upwind Interpolation (QUICK)
FLUENT interpolation schemes for Face Pressure:StandardLinearSecond-OrderBody Force WeightedPRESTO!
Pressure-Velocity CouplingSIMPLESIMPLECPISO (iterative & non-iterative)
© Fluent Inc. 4/20/20052-20
Introductory FLUENT NotesFLUENT v6.1 Feb 2003
Fluent User Services Center
www.fluentusers.com
Convergence and Accuracy
At convergence:Solution no longer changes.Overall mass, momentum, energy, and scalar balances are achieved.Monitor Residuals, relevant key variables and overall mass balance
A converged solution is not necessarily a correct one.Use the second-order upwind discretization scheme for final results.Ensure that solution is grid-independent:
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