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Infinite Analysis Research Division (Takehiro) Lab
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The lab uses fluid dynamics to study flows in the atmospheres, mantles, and cores of the Earth and other planets.
AboutAbout the lab
Understanding planetary-scale flows through simple models
The Takehiro Lab uses fluid dynamics to study fluid phenomena that occur on celestial bodies such as the Earth and other planets.
It focuses on the factors that give planetary-scale flows their characteristic features: planetary rotation, gravity and density stratification, phase changes of constituent materials, and spherical geometry.
The lab turns phenomena in planetary atmospheres, mantles, and cores into simplified models, obtains the flows through numerical experiments on computers, and builds theories that capture their properties.
Faculty members and graduate students describe the research group in person, and lab visits are welcome.
Key terms
- Density stratification
- A state in which fluid density varies in layers with height or depth, such as heavy fluid below and light fluid above
- Numerical experiment
- A method of investigating the behavior of a flow by solving, on a computer, the equations of a model that simplifies a phenomenon
- Thermal convection
- Flow created when fluid heated from below rises, then cools and sinks
- Shear flow
- Flow in which streams of different velocities run side by side. Instabilities that can trigger a change to turbulence occur in it.
ResearchResearch themes
The lab investigates flows in the atmospheres, mantles, and cores of the Earth and other planets using simplified models, numerical experiments on computers, and theory. It aims to understand the basic fluid-dynamical behavior underlying a wide variety of fluid phenomena on the Earth and other planets.
*Illustrative imageThermal convection and zonal flows in rotating spherical shells
The lab found that, depending on the rotation rate, banana-shaped or columnar convection cells appear. In recent years, together with researchers in Japan and abroad, it has also studied thermal convection in cores and mantles, dynamos, and atmospheric motions of planets and moons.
*Illustrative imageInstability of shear flows and wave over-reflection
The lab investigates why parallel flows with velocity differences (shear flows) become unstable, focusing on wave propagation. It is working on a more general treatment.
*Illustrative imageDeveloping computing environments for research
Together with groups of researchers across Japan, the lab develops the numerical computing resources needed for research in geophysical (planetary) fluid dynamics.
MembersFaculty
- Associate ProfessorShin-ichi Takehiro
VoicesStudent voices
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Report an errorAbout the images
The top and research theme images are illustrative and were not taken at the lab. They are cropped from Wikimedia Commons images. Cropped CC BY-SA images are provided under the same CC BY-SA license as the original (version shown on each line).
- Top image: “A Close-Up Look at Jupiter’s Dynamic Atmosphere ( )” European Space Agency / CC BY 2.0 (cropped)
- Thermal convection and zonal flows in rotating spherical shells: “Lower Mantle Superplume” Brews ohare / CC BY-SA 3.0 (cropped)
- Instability of shear flows and wave over-reflection: “Kelvin–Helmholtz instability clouds” fdecomite / CC BY 2.0 (cropped)
- Developing computing environments for research: “Kraken Supercomputer ( )” Oak Ridge National Laboratory / CC BY 2.0 (cropped)
- Related lab (Infinite Analysis Lab (Ogata)): “Thousands of Atoms Swap 'Spins' with Partners in Quantum Square Dance ( )” National Institute of Standards and Technology / Public domain (cropped)
- Related lab (Tamagawa Lab): “Klein-map” PSL27 / CC BY-SA 4.0 (cropped)
- Related lab (Infinite Analysis Lab (Mochizuki)): “Kyoto University RIMS” KATSURA Roen / CC BY 3.0 (cropped)
- Related lab (Infinite Analysis Lab (Namikawa)): “Consani-Scholten” Ursulageorges / CC BY 4.0 (cropped)
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