Goodarz Ahmadi and Kambiz Nazridoust
description
Transcript of Goodarz Ahmadi and Kambiz Nazridoust
Fluent Fluent OverviewOverview
Ahmadi/NazridoustME 437/537/637
Fluent Fluent OverviewOverview
Ahmadi/NazridoustME 437/537/637
Fluent Fluent OverviewOverview
Ahmadi/NazridoustME 437/537/637
Solution ParametersSolution Parameters Choosing the SolverChoosing the Solver Discretization SchemesDiscretization Schemes
InitializationInitialization ConvergenceConvergence
Monitoring ConvergenceMonitoring Convergence StabilityStability
Setting Under-relaxationSetting Under-relaxation Setting Courant numberSetting Courant number
Accelerating ConvergenceAccelerating Convergence AccuracyAccuracy
Grid IndependenceGrid Independence AdaptationAdaptation
Set Solution Parameters
Initialize
Enable Solution Monitors
Calculate a Solution
Modify the Solution Parameters or the MeshConverged?
No
No
Yes
Yes
Accurate?
Stop
Fluent Fluent OverviewOverview
Ahmadi/NazridoustME 437/537/637
Import (scale) the mesh fileImport (scale) the mesh file Select physical modelsSelect physical models Define material propertiesDefine material properties Prescribe operating Prescribe operating
conditionsconditions Prescribe boundary Prescribe boundary
conditionsconditions Provide an initial solutionProvide an initial solution Set solver controlsSet solver controls Set up convergence Set up convergence
monitorsmonitors Compute and monitor Compute and monitor
solutionsolution
Menu is laid out such that order of operation is Menu is laid out such that order of operation is generally left to right.generally left to right.
Fluent Fluent OverviewOverview
Ahmadi/NazridoustME 437/537/637
Mouse button functionality depends on Mouse button functionality depends on solver and can be configured in the solver and can be configured in the solversolver
Display MenuDisplay Menu Mouse Buttons... Mouse Buttons... Default Settings:Default Settings:
2D Solver2D Solver Left button translates (dolly)Left button translates (dolly) Middle button zoomsMiddle button zooms Right button selects/probesRight button selects/probes
3D Solver3D Solver Left button rotates about 2-axesLeft button rotates about 2-axes Middle button zoomsMiddle button zooms Right button selects/probesRight button selects/probes
Fluent Fluent OverviewOverview
Ahmadi/NazridoustME 437/537/637
Components are defined in Components are defined in preprocessorpreprocessor Cell = control volume into which Cell = control volume into which
domain is broken updomain is broken up computational domain is defined by computational domain is defined by
mesh that represents the fluid and mesh that represents the fluid and solid regions of interest.solid regions of interest.
Face = boundary of a cellFace = boundary of a cell Edge = boundary of a faceEdge = boundary of a face Node = grid pointNode = grid point Zone = group of nodes, faces, and/or Zone = group of nodes, faces, and/or
cellscells Boundary data assigned to face Boundary data assigned to face
zones.zones. Material data and source terms Material data and source terms
assigned to cell zones.assigned to cell zones.
facecell
node
edge
3D mesh
cell center
2D mesh
node
face
cell
Fluent Fluent OverviewOverview
Ahmadi/NazridoustME 437/537/637
How to…How to… File Menu File Menu Read Read Case Case
Fluent Fluent OverviewOverview
Ahmadi/NazridoustME 437/537/637
How to…How to… Grid Menu Grid Menu
CheckCheck Grid Menu Grid Menu
ScaleScale Grid Menu Grid Menu
TranslateTranslate
Fluent assumes that all physical dimensions are initially in Fluent assumes that all physical dimensions are initially in metersmeters.. The default unit system in Fluent is Metric (SI) units.The default unit system in Fluent is Metric (SI) units.
Fluent Fluent OverviewOverview
Ahmadi/NazridoustME 437/537/637
How to…How to… Display Menu Display Menu Grid Grid
Fluent Fluent OverviewOverview
Ahmadi/NazridoustME 437/537/637
How to…How to… Define Menu Define Menu Models Models Solver Solver
Define Menu Define Menu Models Models Viscous Viscous
Fluent Fluent OverviewOverview
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How to…How to… Define Menu Define Menu Materials Materials Fluent Database Fluent Database
Physical models may Physical models may require additional material require additional material properties need to be properties need to be defined.defined.
Single-Phase, Single Single-Phase, Single Species FlowsSpecies Flows Define fluid/solid Define fluid/solid
propertiesproperties Real gas model Real gas model Multiple Phase Flows Multiple Phase Flows
(Single Species)(Single Species) Define properties for Define properties for
all fluids and solids.all fluids and solids.
Multiple Species Multiple Species (Single Phase) Flows(Single Phase) Flows
Mixture Material concept Mixture Material concept employedemployed
Mixture properties Mixture properties (composition (composition dependent) dependent) defined separately defined separately from constituent’s from constituent’s properties.properties.
Component properties Component properties must be defined.must be defined.
Fluent Fluent OverviewOverview
Ahmadi/NazridoustME 437/537/637
How to…How to… Define Menu Define Menu
Materials Materials Fluent Fluent DatabaseDatabase
Fluent Fluent OverviewOverview
Ahmadi/NazridoustME 437/537/637
To formulate a problem that results in a To formulate a problem that results in a uniqueunique solution, the relevant variables at solution, the relevant variables at the domain boundaries must be defined.the domain boundaries must be defined.
Specifying velocity, temperature and Specifying velocity, temperature and pressure or fluxes of mass, momentum, pressure or fluxes of mass, momentum, energy.energy.
Defining boundary conditions involves:Defining boundary conditions involves:
i.i. identifying the location of the identifying the location of the boundaries (e.g., inlets, walls, boundaries (e.g., inlets, walls, symmetry)symmetry)
ii.ii. supplying information at the boundariessupplying information at the boundaries
Fluent Fluent OverviewOverview
Ahmadi/NazridoustME 437/537/637
How to… How to… Define Menu Define Menu Boundary Conditions Boundary Conditions Select ZonesSelect Zones
Boundary Condition Types of Boundary Condition Types of External FacesExternal Faces General: Pressure inlet, Pressure outletGeneral: Pressure inlet, Pressure outlet Incompressible: Velocity inlet, OutflowIncompressible: Velocity inlet, Outflow Compressible flows: Mass flow inlet, Pressure far-Compressible flows: Mass flow inlet, Pressure far-
fieldfield Special: Inlet vent, outlet vent, intake fan, exhaust Special: Inlet vent, outlet vent, intake fan, exhaust
fanfan Other: Wall, Symmetry, Periodic, AxisOther: Wall, Symmetry, Periodic, Axis
Boundary Condition Types of Boundary Condition Types of Cell ‘Boundaries’Cell ‘Boundaries’ Fluid and SolidFluid and Solid
Boundary Condition Types of Boundary Condition Types of Double-Sided Face Double-Sided Face ‘Boundaries’‘Boundaries’ Fan, Interior, Porous Jump, Radiator, WallsFan, Interior, Porous Jump, Radiator, Walls
Fluent Fluent OverviewOverview
Ahmadi/NazridoustME 437/537/637
How to… How to… Define Menu Define Menu Boundary Boundary Conditions Conditions Select Select ZonesZones
Fluent Fluent OverviewOverview
Ahmadi/NazridoustME 437/537/637
How to…How to… Solve Menu Solve Menu Initialize Initialize
Initialize Initialize
Fluent Fluent OverviewOverview
Ahmadi/NazridoustME 437/537/637
How to…How to… Solve Menu Solve Menu Monitors Monitors
Residuals Residuals
The convergence of The convergence of solution can also be solution can also be changedchanged
Fluent Fluent OverviewOverview
Ahmadi/NazridoustME 437/537/637
How to…How to… Solve Menu Solve Menu Iterate Iterate
IterateIterate
Fluent Fluent OverviewOverview
Ahmadi/NazridoustME 437/537/637
How to…How to… Display Menu Display Menu
ContoursContours Display Menu Display Menu Vectors Vectors
Fluent Fluent OverviewOverview
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Flow in a ChannelFlow in a Channel Steady StateSteady State Inlet Velocity is knownInlet Velocity is known Outlet is open to atmospheric pressureOutlet is open to atmospheric pressure No Slip on all wallsNo Slip on all walls Fluid is WaterFluid is Water Desired Grid Resolution is 1500 Hexahedral Cells Desired Grid Resolution is 1500 Hexahedral Cells
60cm
15cm
x-Velocity = 0.85 m/sy-Velocity = 0.00 m/s Outflow