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KIVA-3V: A Block-Structured KIVA Program for Engines with Vertical or Canted Valves

Outline. DescriptionsPre-Processor: K3PrepMain Code: KIVA3Post Processor: K3PostExamples. Descriptions. Introduction. A computer program for 2- and 3-D, transient, turbulent, chemically reactive flows with spraysEspecially for IC engineReleased in 1997Cray, workstation, PC50,000 lines in FOR

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KIVA-3V: A Block-Structured KIVA Program for Engines with Vertical or Canted Valves

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

    15. Type of “Other” is used for gas turbine combustor

    16. 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) Boundary Type Indicating

    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

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