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Introductory FLUENT Notes
FLUENT v6
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fluentusers
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⎛ ∂ρ
⎞
+ ∇ ⋅ ( ρ u )⎟ = 0
⎜
∫∫∫ ⎝ ∂t
⎠
V
Mesh generation
Gambit
Geometry
CAD, Gambit
Physics
Fluent
2-1
© Fluent Inc
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fluentusers
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1
Feb 2003
What is CFD?
Computational Fluid Dynamics (CFD) is the science of predicting
fluid flow, heat and mass transfer, chemical reactions, by solving
numerically the set of governing mathematical equations
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The results of CFD analyses are relevant in:
conceptual studies of new designs
Product development
troubleshooting
Redesign
CFD analysis complements experimentation and theory
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4/20/2005
Introductory FLUENT Notes
FLUENT v6
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fluentusers
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General conservation (transport) equation
for mass, momentum, energy, etc
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continuity
x-mom
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energy
φ
1
u
v
h
Partial differential equations => algebraic equation system
Solved numerically
2-3
© Fluent Inc
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1
Feb 2003
Fluent User Services Center
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The Tools
Fluent
GAMBIT / Tgrid
Solving
Pre-Processing
Solid
Modeler
Mesh
Generator
Equations solved on mesh
Transport Equations
mass
species mass fraction
phasic volume fraction
momentum
energy
Equation of State
Supporting Physical Models
Physical Models
Turbulence
Combustion
Radiation
Multiphase
Phase Change
Moving Zones
Moving Mesh
Material Properties
Boundary Conditions
Initial Conditions
Solver
Settings
Post-Processing
2-4
© Fluent Inc
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fluentusers
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1
Feb 2003
CFD Analysis: Basic Steps
Problem Identification and Pre-Processing
1
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2
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3
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Solver Execution
4
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5
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Post-Processing
6
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7
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2-5
© Fluent Inc
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fluentusers
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1
Feb 2003
Define Your Modeling Goals
Problem Identification and Pre-Processing
1
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2
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3
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What results are you looking for, and how will they be used?
What are your modeling options?
What physical models will need to be included in your analysis?
What simplifying assumptions do you have to make?
What simplifying assumptions can you make?
What degree of accuracy is required?
How quickly do you need the results?
2-6
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1
Feb 2003
Fluent User Services Center
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Identify the Domain
Gas
Problem Identification and Pre-Processing
1
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2
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3
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Boundary condition information
Can the boundary condition types
accommodate that information?
Can you extend the domain to a point
where reasonable data exists?
Is a 2D or axisymmetric approximation
feaseable?
2-7
L-valve
Gas
Example: Cyclone Separator
© Fluent Inc
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fluentusers
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1
Feb 2003
Design and Create the Grid
Problem Identification and Pre-Processing
1
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2
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3
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Quad/hex grid, tri/tet grid or hybrid grid
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triangle
quadrilateral
Is the geometry resolved?
Are large gradients resolved?
Adaption?
Computer resources
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4/20/2005
Fluent User Services Center
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Introductory FLUENT Notes
FLUENT v6
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Quad/Hex Meshes
For simple geometries, quad/hex
meshes can provide higher-quality
solutions with fewer cells than a
comparable tri/tet mesh
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For complex geometries, quad/hex
meshes show no numerical
advantage, and you can save meshing
effort by using a tri/tet mesh
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4/20/2005
Fluent User Services Center
www
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Introductory FLUENT Notes
FLUENT v6
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Set up the numerical model
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Compute and monitor the solution
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For a given problem, you will need to:
Select physical models
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Prescribe operating conditions
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Provide an initial solution
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Set up convergence monitors
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4/20/2005
Fluent User Services Center
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Introductory FLUENT Notes
FLUENT v6
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Set up the numerical model
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Compute and monitor the solution
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Convergence is reached when:
Changes in solution variables from one iteration
to the next are negligible
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Overall property conservation is achieved
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4/20/2005
Fluent User Services Center
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Introductory FLUENT Notes
FLUENT v6
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Examine the results
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Consider revisions to the model
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Visualization Tools
Flow pattern?
Separation?
Shocks, shear layers, etc
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High residuals may be
attributable to only a few
cells of poor quality
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4/20/2005
Fluent User Services Center
www
...
com
Introductory FLUENT Notes
FLUENT v6
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Examine the results
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Consider revisions to the model
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4/20/2005