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• Mr. Shimura (RIST)• Dr. Takahashi ( Obirin University )
New HPC Developmentand Its Applicationto 3D MicrophysicsCloud Simulation
Model Description• Cloud Model : by Prof. Takahashi (197
6) – Three-Dimensional– Anelastic, Non-Hydrostatic– Detailed Microphysics
Waterdrops G raupel Hail Ic e C rystal
P rec ipitations
Microphysics ProcessesNucleus of Cloud Drops
Nucleus of Cloud Drops
InitialCloud Drops
InitialCloud Drops RaindropsRaindrops
FrozenDrops
FrozenDrops
Nucleus ofIce Crystals
Nucleus ofIce Crystals
InitialIce Crystals
InitialIce Crystals
HailHail
GraupelGraupel
Ice CrystalsIce Crystals
Nucleation of Water Particles
CollectionVapor Diffusion
Condensation NucleationContact Nucleation
RimingVapor Diffusion
Immersion Freezing
Deposition Nucleation
CollectionRimingVapor Diffusion
BreakupBreakup
Melting
Model Overview
DynamicsThermodynamics
DynamicsThermodynamics
MicrophysicsMicrophysics
Microphysics(collection,breakup)
Microphysics(collection,breakup)
Re-start DataRe-start Data
•Δt = 1 sec•10 sec times
Leap-frog and Smoothing
Re-start DataRe-start Data
Parallelization Methodology
→ Equal areas of Volume
given to each processor
Communication : Message Passing Interface
XX
YY
Numerical SimulationProblem size → 111 × 111 × 61 Δ x=400m Δ y=400m Δ z=200m
Boundary ConditionsX: OpenY: OpenZ: Rigid free slip
Data : 2.5 GB
・ dynamics : 0.8GB
・ cloud microphysics : 1.7GB
Data : 2.5 GB
・ dynamics : 0.8GB
・ cloud microphysics : 1.7GB
45km
45
k
m
12k
m
Environmental Conditions
• Maritime ICE ・ WARM ・ FROZEN
• Continental ICE ・ WARM
Max. Ice Nuclei Cloud Nuclei Freezing
Maritime Ice 1/cc 300/cc Vali, Hallet & MossopMaritime Warm - 300/cc -Maritime Frozen - 300/cc r > 400μ m, T < -5℃ & HMContinental Ice 1/cc 1000/cc Vali, Hallet & MossopContinental Warm - 1000/cc -
Microphysics Sensitive
– Vertical Latent Heat Profile– Rainfall Amount and Pattern– Cloud Organization
In Maritime-Ice Condition
• Mother Cell Graupel Capture Daughter Cell Drizzle – Intense Rainfall– Low Level HIGH– New Raincells to N-S Direction
Ice Contribution
– Ice/Vapor > 0.5%, Ice Contributes to Rain– Torrential Rain only with Ice– Continental Slow Process, 1/3 effective
Conclusion
– Both Rain Amount and Cloud Organization are sensitive to Microphysics
– Rain Accumulation near Freezing Level through Graupel or Frozen Drop Growth
Future Plans
• Model Physics– Large Domain Calculation
• more than 400km × 400km × 15km
• Computational– Optimal Load Balancing– Optimal Data Structure– Visualization (???)
3次元雲微物理( BIN )モデル( 45km × 45km × 12km )
T=60min. T=80min.
T=120min.T=100min.
氷晶雲粒
霧雨霰・雹
雨滴
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