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Fluid Dynamics Lab
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The lab studies gas flows, from shock waves to molecular motion, using mathematical formulas and experiments.
AboutAbout the lab
Unraveling fast, complex flows
The Fluid Dynamics Lab studies fast, complex flows, such as the shock waves and turbulence that form around supersonic vehicles.
It develops simple, reliable methods for computing such flows and applies them to the analysis of aerospace fluid problems.
Another theme is experimental research on rarefied gases and flows at the micro and nano scales.
In such gases, flows are generated even near a wall that is at rest. Using this effect, the lab develops devices that separate a gas mixture into its components, among other things.
Key terms
- Shock wave
- An extremely thin layer, formed around an object moving faster than sound, where pressure and temperature change abruptly
- Boltzmann equation
- An equation describing how the distribution of speeds of many gas molecules changes over time
- Thermal transpiration
- A phenomenon in which, in a rarefied gas, gas flows from the cold side to the hot side because of temperature differences along a wall
ResearchResearch themes
Based on the kinetic theory of gas molecules (the Boltzmann equation), the lab develops numerical methods for fast, complex flows, and also investigates flows specific to rarefied gases through analysis and experiments, studying their applications.
*Illustrative imageSolving flows with a new computational method
The lab develops highly accurate gas-kinetic schemes for the equations of compressible flow. They give good results with few grid points in both shock waves and boundary layers, and are applied to practical problems such as supersonic flows.
*Illustrative imageCooling vehicles with a counterflow jet
As a way to cool the nose of hypersonic spacecraft, the lab studies film cooling by a jet blown out against the oncoming flow. It is exploring the possibility of achieving a high cooling effect with a small amount of coolant.
*Illustrative imageImproving the method for computing molecular motion
For the direct simulation Monte Carlo (DSMC) method, which computes flows of low-density gases and flows in small systems, the lab reconsidered the time accuracy and proposed a new, more accurate DSMC method.
*Illustrative imageSeparating gases with only a temperature difference
Using molecular effects such as thermal transpiration, the lab develops gas pumps with no moving parts and methods for separating gas mixtures. It aims to create a device that can separate any isotope using only the temperature difference between hot and cold water.
MembersFaculty
The faculty of the Fluid Dynamics Lab are Professor Taku Ohwada and Lecturer Hiroshi Sugimoto.
- ProfessorTaku Ohwada
- LecturerHiroshi Sugimoto
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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: “Shockwave pattern around a T-38C observed with Background-Oriented Schlieren photography (1)” NASA & US Air Force: J.T. Heineck / Ed Schairer / Maj. Jonathan Orso / Maj. Jeremy Vanderhal / Public domain (cropped)
- Solving flows with a new computational method: “Schlieren photograph of T-38 shock waves” Leonard Weinstein / NASA / Public domain (cropped)
- Cooling vehicles with a counterflow jet: “Blunt body reentry shapes” NASA / Public domain (cropped)
- Improving the method for computing molecular motion: “JAXA 1.27m Hypersonic Wind Tunnel P4223597” Kestrel / CC BY-SA 4.0 (cropped)
- Separating gases with only a temperature difference: “Massflow gas flow controller” ரோஜா / CC BY-SA 3.0 (cropped)
- Related lab (Environmental Thermo-Fluid Engineering Lab): “Kelvin-Helmholtz waves” Astronautilus / CC BY 2.0 (cropped)
- Related lab (Propulsion Engineering Lab): “Xenon hall thruster” Jet Propulsion Laboratory / Public domain (cropped)
- Related lab (Control Engineering Lab): “Quadcopter Drone in flight” Project Kei / CC BY-SA 4.0 (cropped)
- Related lab (Functional Machine Elements Engineering Lab): “Ball-bearing-numbered” Niabot / CC BY-SA 3.0 (cropped)
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