Adaptive Mesh Particle Simulator (AMPS)
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Transcript of Adaptive Mesh Particle Simulator (AMPS)
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Adaptive Mesh Particle Simulator (AMPS)
Valeriy Tenishev, Dmitriy Borovikov, Nicolas Fougere, Yuni Lee, Michael R. Combi, Tamas Gombosi, Martin Rubin
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New component of SWMF
SWMF Control & Infrastructure
EruptionGenerator
Solar Corona
InnerHeliosphere
GlobalMagnetosphere
Polar Wind
InnerMagnetosphere
IonosphericElectrodynamics
Thermosphere& Ionosphere
Energetic
Particles
Radiation
Belts
3D OuterHeliosphere
Couplers
Flare/CMEObservations
UpstreamMonitors
RadarsMagnetometers
In-situ
F10.7 FluxGravity Waves
Magneto-grams,rotation
tomography
Particle in Cell
Particle
Tracker
BATSRUS
IPIC3D
AMPS
BATSRUSBATSRUS
BATSRUS
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AMPS
DSMC schemeo Realistic modeling of collisions in rarefied gaso Photochemical reactions for production of the minor species
Two phase simulation: gas and dust in a single model run
Adaptive mesh with cut-cellso Irregular nucleus shape for modeling the comao Realistic shape model of Rosetta spacecraft for modeling of its
gas environmento Variable mesh resolution to capture important features of the
dusty gas flow
Integration with SPICE and SWMF
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Method and Applications
Non-equilibrium dusty gas flow Comets, planetary satellites and exospheres▪ Common characteristic: the collision coupling
cannot maintain the state of the equilibrium
Kinetic description Boltzmann equation The evolution of the system is modeled by
tracing the model particles▪ Translational motion is separated from the
particles collisions and chemistry
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Method
Translational particle motion
Particle collisions and chemistry HS, VHS, VSS molecular models TC, NTC, MF collision models LB, QLB models of the internal degrees of
freedom Photo-ionization and photo-dissociation
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Method
Ion/neutral gas and dust Modeled simultaneously
Optimizations Local time step and particle weight Individual particle weight correction Domain decomposition Load balancing▪ Static: volume, cell number ▪ Dynamic: particle number, execution time
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Mesh
AMR with cut-cells
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Execution
Stand-along and a component of SWMF
SettingsUser-defined
parameter file
User-defined model routines
Generic AMPS’core
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Coupling with SWMF
New coupling scheme between AMPS and BATSRUS
One-way coupling in production runs
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Example
Na in Moon’s exosphere
SPICE routines are integrated into AMPS. SPICE is used for calculating Moon’s orbital parameters, location of the spacecraft and pointing direction of the instrument.
Sodium exospheric brightness. Comparison with observations obtained by UV instrument onboard Kaguya. Calculation of the column integrals are incorporated into AMPS.
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Example
New development: O2 and O2+ in Europa’s exosphere
O2 number density. Produced via sputtering by the magnetospheric ions. The ions flux is derived form BATSRUS restart files
O2+ number density. Produced ionization of O2. Newly created ions are traced in the fields exported from BATSRUS restart files