AVL-Fire 汽油机实例

【实例截图】

【核心代码】

Table of Contents
1. Introduction _____________________________________________________1-1
1.1. Scope _______________________________________________________________________1-1
1.2. User Qualifications ___________________________________________________________1-1
1.3. Symbols _____________________________________________________________________1-1
1.4. Configurations _______________________________________________________________1-2
2. IC Engine: Gasoline (920) ________________________________________2-1
2.1. Simulation Domain - Overview_________________________________________________2-1
2.2. Meshing Strategy – Overview __________________________________________________2-2
2.2.1. Recommended File Structure on disk _______________________________________2-2
2.2.2. Recommended Workflow___________________________________________________2-2
2.2.3. Selection Naming Conventions: Recommended and Required __________________2-4
2.3. Meshing Procedure – FAME Hexa______________________________________________2-4
2.3.1. Overview ________________________________________________________________2-4
2.3.2. Surface Mesh_____________________________________________________________2-4
2.3.2.1. Import Surface Mesh __________________________________________________2-5
2.3.2.2. Save Project __________________________________________________________2-5
2.3.2.3. Selection Specification _________________________________________________2-5
2.3.3. Edge Mesh _______________________________________________________________2-9
2.3.3.1. Edge Mesh at Valve Region_____________________________________________2-9
2.3.4. Setup FAME Hexa Meshing_______________________________________________2-14
2.3.5. Check Mesh Quality______________________________________________________2-17
2.3.6. Hints to Improve Mesh Quality____________________________________________2-18
2.4. Meshing Procedure - FEP ____________________________________________________2-18
2.4.1. Create New Project ______________________________________________________2-18
2.4.2. Prerequisites – Create Additional Meshes___________________________________2-19
2.4.2.1. Hints for Surface Details ______________________________________________2-20
2.4.2.2. Hints for Closed Valves - Moving Selections _____________________________2-21
2.4.3. Setup FEP Meshing Procedure ____________________________________________2-22
2.4.3.1. How to start FEP? ___________________________________________________2-22
2.4.3.2. Input Surfaces _______________________________________________________2-25
2.4.3.3. Settings _____________________________________________________________2-27
2.4.3.4. Start Meshing _______________________________________________________2-32
2.4.3.5. Results______________________________________________________________2-32
2.4.3.6. Write .fmo – file______________________________________________________2-33
2.5. Solver GUI _________________________________________________________________2-33
2.5.1. Typical Boundary Conditions______________________________________________2-33
2.5.2. Define Data for Calculation _______________________________________________2-34
2.5.2.1. Run Mode ___________________________________________________________2-34
2.5.2.2. Module Activation____________________________________________________2-34
FIRE v2013 IC Engine: Gasoline (920)
ii AST.08.0920.2013 – 28-Feb-2013
2.5.2.3. Boundary Conditions _________________________________________________2-35
2.5.2.4. Fluid Properties (Air)_________________________________________________2-38
2.5.2.5. Initial Conditions ____________________________________________________2-38
2.5.2.6. Solver Control _______________________________________________________2-40
2.5.2.7. Output Control ______________________________________________________2-41
2.6. Modules ____________________________________________________________________2-44
2.6.1. Combustion _____________________________________________________________2-44
2.6.1.1. Save Project _________________________________________________________2-44
2.6.2. Start Calculation ________________________________________________________2-44
2.6.3. Monitoring the Calculation _______________________________________________2-44
2.6.3.1. Monitoring the .flb-file________________________________________________2-44
2.6.3.2. Monitoring the .fla-file (Linux Users only) ______________________________2-45
2.6.4. Stopping and Restarting a Calculation _____________________________________2-46
2.7. Post-processing _____________________________________________________________2-46
2.7.1. Load Results ____________________________________________________________2-46
2.7.1.1. Create surface cut and create a movie___________________________________2-46
IC Engine: Gasoline (920) FIRE v2013
AST.08.0920.2013 – 28-Feb-2013 iii
List of Figures
Figure 2-1: Simulation Domain ...............................................................................................................................2-1
Figure 2-2: Surface Mesh – Worst Case ..................................................................................................................2-3
Figure 2-3: Surface Mesh..........................................................................................................................................2-5
Figure 2-4: Edge Tool – Auto Edge Window.........................................................................................................2-10
Figure 2-5: Surface and Edge Mesh.......................................................................................................................2-10
Figure 2-6: Edge Mesh – Remove Edges ...............................................................................................................2-11
Figure 2-7: Location of Additional Edges .............................................................................................................2-11
Figure 2-8: Create Trajectory.................................................................................................................................2-12
Figure 2-9: Create Edges – Detail Valve Seat Area..............................................................................................2-13
Figure 2-10: Create Edge Mesh - Detail................................................................................................................2-13
Figure 2-11: Edge Mesh – Final State ...................................................................................................................2-14
Figure 2-12: FAME Hexa Volume Mesh – Final State ........................................................................................2-17
Figure 2-13: FAME Hexa Volume Mesh – View Inside Mesh.............................................................................2-17
Figure 2-14: Surface Mesh – Valid from 360 to 581 CA ......................................................................................2-19
Figure 2-15: Surface Mesh – Valid from 581 to 869 CA ......................................................................................2-20
Figure 2-16: Surface Mesh – Valid from 869 to 1080 CA .....................................................................................2-20
Figure 2-17: Cross Section – Valve Gap Area.......................................................................................................2-21
Figure 2-18: Closed Valve – Detail Valve Seat ......................................................................................................2-21
Figure 2-19: Change Valid Range of Surface Mesh..............................................................................................2-22
Figure 2-20: Definition of Axes Direction.............................................................................................................2-23
Figure 2-21: Moving Piston Definition .................................................................................................................2-23
Figure 2-22: Moving Intake Valve Definition.......................................................................................................2-24
Figure 2-23: Moving Exhaust Valve Definition....................................................................................................2-25
Figure 2-24: Add Surface Window.........................................................................................................................2-26
Figure 2-25: Validate Selections Labeling Conflicts............................................................................................2-27
Figure 2-26: Settings Window................................................................................................................................2-28
Figure 2-27: Explanation of Meshing Interval .....................................................................................................2-29
Figure 2-28: Exceptions for BND_Liner Selection.............................................................................................2-30
Figure 2-29: Exceptions for _REF_IN_Seat_3 Selection..................................................................................2-30
Figure 2-30: Exceptions for _REF_EX_Seat_3 Selection..................................................................................2-31
Figure 2-31: Exceptions for _REF_IN_Valves_5 Selection .............................................................................2-31
Figure 2-32: Exceptions for _REF_EX_Valves_5 Selection .............................................................................2-31
Figure 2-33: Exceptions for _REF_Piston Selection.........................................................................................2-31
Figure 2-34: Reinitialization – Input Parameters................................................................................................2-39
Figure 2-35: Formula – Input Parameters............................................................................................................2-42
Figure 2-36: Log Monitoring Window...................................................................................................................2-45
Figure 2-37: Surface cut – Temperature Exemplary at 900 deg. CA..................................................................2-47