IC Engine System-ansys

Different Meshing Configurations
Inflation layer in the port
No Inflation layer in the port
Different Meshing Configurations
Decomposition in combustion chamber region for layered mesh
2009
2010
Fluent R13
2011
2012
Fluent R14.5
Sprays: spray angle vs. crank angle, cone injection sector meshes Mesh related: 2nd order in time MDM, contact detection, cutcelg Configurations
4 layers between valve and valve‐seat at fully‐ closed position of valve
one layer in the gap at fully‐closed position of valve
– – – – – Reads the valve and piston profile Create various dynamic mesh zones Create interfaces required for dynamic mesh setup Set up the dynamic mesh parameters Create all the required events, to model opening and closing of valves, and corresponding modifications in solver settings and under‐relaxations factors Set up the required models Set up the default boundary conditions and material Set up the default monitors Initialize and patch the solution
Geometry Preparation
Geometry Inputs
Basic Geometry Information
Valve geometry and profile information Optional Animation Inputs Advanced Options
Mesh Generation
Fluent R12
IC engine report, IC specific vaporization laws, coherent flamelet model, EGR, ignition UDF
Fluent R14
Aftertreatment: selective catalytic reduction, catalytic converter light off Combustion: G‐eqn Multiphase: SSD
• • •
Demo Future Plans Summary
Among internal combustion engine CFD applications, in‐cylinder flow is of central importance in determining engine efficiency and emissions
Scope of IC Engine System
• Automated geometry preparation and mesh generation for all 4 stroke engines – any number of valves – all standard shapes of piston at the given crank angle • Automated case setup for “cold‐flow” and “port‐flow” type simulations based on the best practices – including mesh motion • User hooks for complex physics setup, e.g. spray injection, combustion simulation • Automated report generation
– Gather the required user input needed to accurately model the user’s specific engine. WB‐ICE tool – Prepare the Geometry and Mesh: operations semi‐ Perform following automatically suitable for modeling the • Decompose the geometry in a manner motion of valves and piston and then create the mesh Geometry Solver Setup • Manually decomposing Decomposition the geometry and meshing takes between 6 hours and a couple of days, depending on experience Mesh Creation • Learning curve for manual geometry decomposition and meshing is very steep!! – Set‐up and run the simulation: • Setting up the case requires knowledge of models like dynamic mesh, reacting flows, discrete‐phase etc. – Analyze and interpret results
IC Engine Results
Automatic Report Generation
IC Engine System: Introduction
• IC Engine System
• A new Workbench Analysis System similar to Fluid‐Flow(Fluent) or Fluid‐Flow (CFX) Analysis Systems • Reduces the setup time of ICE cold flow and port flow problems from many hours to few minutes • First released ANSYS R14 • Supported on Windows and Linux platforms • Standard feature included with ANSYS FLUENT
Can be used to setup a customized case Can be used to perform custom post‐processing
Workbench ICE System
ANSYS Workbench
CAD Automatically Generated Reports
IC Engine System Properties
For engines with piston pin offset
These IC inputs can be defined as Parameters
User can hook boundary condition profiles
No decomposition in chamber region for engines with very little squish at TDC or pistons with valve recess regions
Solver Setup
• IC Engine System will automatically setup the problem
DesignModeler ANSYS Meshing Single Mesh
Multiple Meshes (keyframes) (new R14.5)
FLUENT Solver CFD Post
Cold Flow Simulation Setup Using IC Engine System:
Cold Flow Simulation using IC Engine System
• Automatic preparation of geometry for meshing • Automatic meshing including inflation layers and layering zones • Automatic setup dynamic zones, events, and solver settings • HTML report creation • Reduces the turnaround time (CAD import to CFD setup) to less than an hour
Key‐frame mesh, mesh smoothing, DPM and combustion extensions: multiple spark model, Veynante ECFM for LES, KHRT break‐up model,
* The Workbench IC Engine system uses a well‐tested subset of Fluent features