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Release 11.0 Documentation for ANSYS
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I. CFD
1. Overview of FLOTRAN CFD Analyses
1.1. Types of FLOTRAN Analyses
1.1.1. Laminar Flow Analysis
1.1.2. Turbulent Flow Analysis
1.1.3. Thermal Analysis
1.1.4. Compressible Flow Analysis
1.1.5. Non-Newtonian Fluid Flow Analysis
1.1.6. Multiple Species Transport Analysis
1.1.7. Free Surface Analysis
1.2. About GUI Paths and Command Syntax
2. The Basics of FLOTRAN Analysis
2.1. Characteristics of the FLOTRAN Elements
2.1.1. Other Element Features
2.2. Considerations and Restrictions for Using the FLOTRAN Elements
2.2.1. Limitations on FLOTRAN Element Use
2.3. Overview of a FLOTRAN Analysis
2.3.1. Determining the Problem Domain
2.3.2. Determining the Flow Regime
2.3.3. Creating the Finite Element Mesh
2.3.4. Applying Boundary Conditions
2.3.5. Setting FLOTRAN Analysis Parameters
2.3.6. Solving the Problem
2.3.7. Examining the Results
2.4. Files the FLOTRAN Elements Create
2.4.1. The Results File
2.4.2. The Print File (Jobname.PFL)
2.4.3. The Nodal Residuals File
2.4.4. The Restart File
2.4.5. The Domain File
2.4.6. Restarting a FLOTRAN Analysis
2.5. Convergence and Stability Tools
2.5.1. Relaxation Factors
2.5.2. Inertial Relaxation
2.5.3. Modified Inertial Relaxation
2.5.4. Artificial Viscosity
2.5.5. DOF Capping
2.5.6. The Quadrature Order
2.6. What to Watch For During a FLOTRAN Analysis
2.6.1. Deciding How Many Global Iterations to Use
2.6.2. Convergence Monitors
2.6.3. Stopping a FLOTRAN Analysis
2.6.4. Pressure Results
2.7. Evaluating a FLOTRAN Analysis
2.8. Verifying Results
3. FLOTRAN Laminar and Turbulent Incompressible Flow
3.1. Activating the Turbulence Model
3.1.1. The Role of the Reynolds Number
3.1.2. Determining Whether an Analysis Is Turbulent
3.1.3. Turbulence Ratio and Inlet Parameters
3.1.4. Turbulence Models
3.2. Meshing Requirements
3.3. Flow Boundary Conditions
3.4. Strategies for Difficult Problems
3.5. Example of a Laminar and Turbulent FLOTRAN Analysis
4. FLOTRAN Thermal Analyses
4.1. Meshing Requirements
4.2. Property Specifications and Control
4.3. Thermal Loads and Boundary Conditions
4.3.1. Applying Loads
4.4. Solution Strategies
4.4.1. Constant Fluid Properties
4.4.2. Forced Convection, Temperature Dependent Properties
4.4.3. Free Convection, Temperature Dependent Properties
4.4.4. Conjugate Heat Transfer
4.5. Heat Balance
4.6. Surface-to-Surface Radiation Analysis Using the Radiosity Method
4.6.1. Procedure
4.6.2. Heat Balances
4.7. Examples of a Laminar, Thermal, Steady-State FLOTRAN Analysis
4.7.1. The Example Described
4.7.2. Doing the Buoyancy Driven Flow Analysis (GUI Method)
4.7.3. Doing the Buoyancy Driven Flow Analysis (Command Method)
4.8. Example of Radiation Analysis Using FLOTRAN (Command Method)
4.9. Where to Find Other FLOTRAN Analysis Examples
5. FLOTRAN Transient Analyses
5.1. Time Integration Method
5.2. Time Step Specification and Convergence
5.3. Terminating and Getting Output from a Transient Analysis
5.4. Applying Transient Boundary Conditions
6. Volume of Fluid (VOF) Analyses
6.1. VFRC Loads
6.1.1. Initial VFRC Loads
6.1.2. Boundary VFRC Loads
6.2. Input Settings
6.2.1. Ambient Conditions
6.2.2. VFRC Tolerances
6.2.3. VOF Time Steps
6.3. Postprocessing
6.4. VOF Analysis of a Dam
6.4.1. The Problem Described
6.4.2. Building and Solving the Model (Command Method)
6.5. VOF Analysis of Open Channel with an Obstruction
6.5.1. The Problem Described
6.5.2. Building and Solving the Model (Command Method)
6.6. VOF Analysis of an Oscillating Droplet
6.6.1. The Problem Described
6.6.2. Results
6.6.3. Building and Solving the Model (Command Method)
6.6.4. Where to Find Other Examples
7. Arbitrary Lagrangian-Eulerian (ALE) Formulation for Moving Domains
7.1. Boundary Conditions
7.2. Mesh Updating
7.3. Remeshing
7.4. Postprocessing
7.5. ALE Analysis of a Simplified Torsional Mirror
7.5.1. The Problem Described
7.5.2. Boundary Conditions
7.5.3. Forces and Moments
7.5.4. Building and Solving the Model (Command Method)
7.6. ALE/VOF Analysis of a Vessel with a Moving Wall
7.6.1. The Problem Described
7.6.2. Results
7.6.3. Building and Solving the Model (Command Method)
7.7. ALE Analysis of a Moving Cylinder
7.7.1. The Problem Described
7.7.2. Results
7.7.3. Building and Solving the Model (Command Method)
8. FLOTRAN Compressible Analyses
8.1. Property Calculations
8.2. Boundary Conditions
8.3. Structured vs. Unstructured Mesh
8.4. Solution Strategies
8.4.1. Inertial Relaxation
8.5. Example of a Compressible Flow Analysis
8.5.1. The Example Described
8.6. Doing the Example Compressible Flow Analysis (GUI Method)
8.7. Doing the Example Compressible Flow Analysis (Command Method)
9. Specifying Fluid Properties for FLOTRAN
9.1. Fluid Property Types
9.1.1. Property Types for Specific Heat
9.1.2. Property Types for Density and Thermal Conductivity
9.1.3. Property Types for Viscosity
9.1.4. Property Types for Surface Tension Coefficient
9.1.5. Property Types for Wall Static Contact Angle
9.1.6. General Guidelines for Setting Property Types
9.1.7. Density
9.1.8. Viscosity
9.1.9. Specific Heat
9.1.10. Thermal Conductivity
9.1.11. Surface Tension Coefficient
9.1.12. Wall Static Contact Angle
9.2. Initializing and Varying Properties
9.2.1. Activating Variable Properties
9.3. Modifying the Fluid Property Database
9.4. Using Reference Properties
9.5. Using the ANSYS Non-Newtonian Flow Capabilities
9.5.1. Activating the Power Law Model
9.5.2. Activating the Carreau Model
9.5.3. Activating the Bingham Model
9.6. Using User-Programmable Subroutines
10. FLOTRAN Special Features
10.1. Coordinate Systems
10.2. Rotating Frames of Reference
10.3. Swirl
10.4. Distributed Resistance/Source
11. FLOTRAN CFD Solvers and the Matrix Equation
11.1. Tri-Diagonal Matrix Algorithm
11.2. Semi-Direct Solvers
11.2.1. Preconditioned Generalized Minimum Residual (PGMR) Solver
11.2.2. Preconditioned BiCGStab (PBCGM) Solver
11.3. Sparse Direct Method
12. Coupling Algorithms
12.1. Algorithm Settings
12.1.1. Advection Scheme
12.1.2. Solver
12.1.3. Relaxation Factors
12.2. Performance
13. Multiple Species Transport
13.1. Mixture Types
13.1.1. Dilute Mixture Analysis
13.1.2. Composite Mixture Analysis
13.1.3. Composite Gas Analysis
13.2. Doing a Multiple Species Analysis
13.2.1. Establish the Species
13.2.2. Choose an Algebraic Species
13.2.3. Adjust Output Format
13.2.4. Set Properties
13.2.5. Specify Boundary Conditions
13.2.6. Set Relaxation and Solution Parameters
13.3. Doing a Heat Exchanger Analysis Using Two Species
13.4. Example Analysis Mixing Three Gases
14. Advection Discretization Options
14.1. Using SUPG and COLG
14.2. Strategies for Difficult Solutions
II. Acoustics
15. Acoustics
15.1. Solving Acoustics Problems
15.2. Building the Model
15.2.1. Harmonic Acoustic Analysis Guidelines
15.3. Meshing the Model
15.3.1. Step 1: Mesh the Interior Fluid Domain
15.3.2. Step 2: Generate the Infinite Acoustic Elements
15.3.3. Step 3: Specify the Fluid-Structure Interface
15.4. Applying Loads and Obtaining the Solution
15.4.1. Step 1: Enter the SOLUTION Processor
15.4.2. Step 2: Define the Analysis Type
15.4.3. Step 3: Define Analysis Options
15.4.4. Step 4: Apply Loads on the Model
15.4.5. Step 5: Specify Load Step Options
15.4.6. Step 6: Back Up Your Database
15.4.7. Step 7: Apply Additional Load Steps (Optional)
15.4.8. Step 8: Finish the Solution
15.5. Reviewing Results
15.6. Fluid-Structure Interaction
15.7. Sample Applications
15.8. Example 1: Fluid-Structure Coupled Acoustic Analysis (Command Method)
15.9. Example 2: Room Acoustic Analysis (Command Method)
III. Thin Film
16. Thin Film Analysis
16.1. Elements for Modeling Thin Films
16.2. Squeeze Film Analysis
16.2.1. Static Analysis Overview
16.2.2. Harmonic Response Analysis Overview
16.2.3. Flow Regime Considerations
16.2.4. Modeling and Meshing Considerations
16.2.5. Analysis Settings and Options
16.2.6. Loads and Solution
16.2.7. Review Results
16.2.8. Example Problem
16.3. Modal Projection Method for Squeeze Film Analysis
16.3.1. Modal Projection Method Overview
16.3.2. Steps in Computing the Damping Parameter Using the Modal Projection Technique
16.3.3. Example Problem Using the Modal Projection Method
16.3.4. Damping Extraction for Large Signal Cases
16.4. Slide Film Damping
16.4.1. Slide Film Damping Example

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4.9. Example of a 2-D Radiation Analysis Using the Radiosity Method with Decimation and Symmetry (Command Method)		Up / HomeNext
Part I, CFD
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