KIVA3V: A BlockStructured KIVA Program for Engines with Vertical or Canted Valves - PowerPoint PPT Presentation

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KIVA3V: A BlockStructured KIVA Program for Engines with Vertical or Canted Valves

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KIVA-3V: A Block-Structured KIVA Program for Engines with Vertical ... Purdue University Calumet. Outline. Descriptions. Pre-Processor: K3Prep. Main Code: KIVA3 ... – PowerPoint PPT presentation

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Title: KIVA3V: A BlockStructured KIVA Program for Engines with Vertical or Canted Valves


1
KIVA-3V A Block-Structured KIVA Program for
Engines with Vertical or Canted Valves
  • Ke Su and Qian Zhou
  • Department of Engineering
  • Purdue University Calumet

2
Outline
  • Descriptions
  • Pre-Processor K3Prep
  • Main Code KIVA3
  • Post Processor K3Post
  • Examples

3
Descriptions
4
Introduction
  • A computer program for 2- and 3-D, transient,
    turbulent, chemically reactive flows with sprays
  • Especially for IC engine
  • Released in 1997
  • Cray, workstation, PC
  • 50,000 lines in FORTRAN language
  • Three parts Pre-processor, Main code and
    Post-processor

5
Grid System
  • 2D/3D/axisymmetric
  • BFC
  • Block-structured mesh
  • Indirect addressing
  • Snapper (piston motion)

6
Turbulence Models
  • Standard K-e turbulence model
  • Sub-grid scale (SGS) model
  • RNG K-e turbulence model

7
Chemical Reactions
  • Kinetic chemical reaction (Arrhenius)
  • Equilibrium chemical reaction
  • Mixing-controlled turbulent combustion model
  • Soot model

8
Spray Models
  • Injection Continuous, wave (half-sine and
    square)
  • Lagrangian tracking
  • Evaporation model
  • Breakup model
  • Coalescence model
  • Particle based model for wall film
  • Fuel library (37 fuels)

9
Boundary Conditions
  • Velocity and Pressure Boundaries
  • Inflow
  • Outflow
  • Slip, no slip
  • Turbulent law-of-the-wall
  • Periodic
  • Moving
  • Axis

10
  • Temperature Boundary
  • Adiabatic wall
  • Fixed temperature wall
  • Fixed heat flux

11
Pre-Processor K3PREP.F
12
Data Files
  • Input File
  • IPREP written by user
  • Output Files
  • OTAPE17 for main code
  • OTAPE11 general information

13
Grid Generating
  • Five basic block shapes (Fig.2)
  • Tabular coordinates for the detailed shape of
    cup, or head dome
  • All blocks patched together to create complex
    geometry

14
Block Type Defining
  • Five Basic Block Types (for IC engine)
  • Cup
  • Squish
  • Dome
  • Valve
  • Other

15
  • Type of Other is used for gas turbine combustor

16
Boundary Type Indicating
  • Ten Boundary Types
  • Moving (e.g. piston)
  • Solid wall
  • Cylindrical axis (for axisymmetric)
  • Fluid interface (for interface of two blocks)
  • Front periodic (J-direction only)

17
  • Back periodic (J-direction only)
  • Inflow velocity
  • Outflow velocity
  • Inflow pressure
  • Outflow pressure

18
Main Code KIVA3.F
19
Data Files
  • Input Files
  • ITAPE5 written by user
  • ITAPE17 grid file from K3PREP
  • Output Files
  • OTAPE9 for post processor
  • OTAPE12 general information
  • OTAPE8 for restart

20
Computation Controls
  • Iteration number
  • Restart flag
  • Residual errors
  • Monitor display

21
Turbulent Models
  • Standard K-e turbulent model flag
  • Sub-grid scale (SGS) model flag
  • RNG k-e turbulence model flag

22
Chemical Reaction Models
  • Kinetic chemical reaction model flag
  • Equilibrium chemical reaction model flag
  • Mixing-controlled turbulent combustion model flag
  • Soot model flag
  • Species physics setting

23
Spray Setting
  • Spray injection options
  • continuous
  • half-sine and square wave
  • Spray setting
  • injection time
  • nozzle number
  • injection positions and angles
  • initial velocities and temperature

24
  • initial SMR
  • fuel mass flow rates, etc.
  • Evaporation model flag
  • Breakup model flag
  • Coalescence model flag
  • Particle based model for wall film dynamics flag
  • Fuel options

25
Ignition Setting
  • Ignition temperature
  • Ignition setting
  • ignition time
  • igniter number
  • ignition positions
  • ignition energy

26
Boundary and Initial Conditions
  • Inlet velocity, pressure, temperature
  • Outlet pressure
  • Solid wall temperature
  • Initial fields

27
Post Processor Tecplot is
used instead of K3POST.F
28
  • Vector velocities
  • Contours temperature
  • pressure kinetic energy
  • dissipate rate, etc.
  • Particles velocities
  • temperature
  • sizes

29
What We have done
30
  • PC version (originally Cray and workstation
    version)
  • Multi-velocity inlet boundaries
  • Simulation of gas turbine combustor flows

31
Gas Phase
  • Velocity (U, V, W)
  • Pressure (P)
  • Temperature (T)
  • Internal energy (e)
  • Density (D)
  • Turbulent kinetic energy (K)
  • Kinetic energy dissipation rate (?)
  • Gas species (Fuel, O2, N2, CO2, H2O, H, H2, O, N,
    OH, CO, NO)

32
Droplet Phase
  • Trajectory (Xp, Yp, Zp)
  • Velocity (Up, Vp, Wp)
  • Temperature (Tp)
  • Size (Dp)

33
Combustion Performance
  • Combustion efficiency (?)
  • Combustion emissions (NOx)
  • Exit temperature pattern factor (OTDF)
  • Ignition Air/Fuel ratio
  • Stability

34
V4 P4 T4 M4
Mf
V3 P3 T3 M3
Gas Flow to Turbine
Air Flow from Compressor
Inlet and Outlet Conditions of Combustor Domain
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