• 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