In our laboratory, we are conducting research on numerical simulation of thermal fluid using a large-scale computer. The research themes can be broadly divided into (1) numerical simulation of fire and safety using FDS (Fire Dynamics Simulator), and (2) direct numerical calculation (DNS) and modeling of turbulent premixed combustion.
In my graduation research, I will use FDS for numerical simulation and visualization. Research themes include (1) tunnel fires and evacuation, (2) fire whirls, and (3) highly accurate prediction of the flow of hydrogen and carbon monoxide.
We aim for research that can contribute to the realization of a safe and secure society.

Numerical simulation of tunnel fire and evacuation

In a car tunnel fire, it is difficult to evacuate due to poor visibility due to smoke. In addition, the effects of toxic gases such as carbon monoxide on the human body must be considered as an evacuation measure. If simulations including water spraying and evacuation by sprinklers can be performed accurately and the site of a tunnel fire can be reproduced on a computer, safety measures can be taken at the design stage and large-scale experiments (expensive). It is possible to reduce the number of times. We aim to improve safety by improving the simulation accuracy of tunnel fires.

Fire whirl

It is said that a large-scale fire whirl occurred in the Great Kanto Earthquake, killing about 40,000 people. There is also information that a fire whirl was witnessed in the Great East Japan Earthquake. In the near future, there is a concern that a fire whirl will occur in an earthquake directly beneath the Tokyo metropolitan area, which is feared to occur. Expected. We are aiming to clarify the mechanism of fire whirl generation that has not yet been elucidated so that we can contribute to disaster mitigation.

Prediction of hydrogen leakage diffusion behavior

In order to prevent global warming, it is required to control carbon dioxide emissions. Fuel cell vehicles that use hydrogen as fuel have been put into practical use and are expected to become widespread in the future. However, on the other hand, hydrogen may have the image of "explosion" and "danger". Hydrogen is a very light gas that diffuses quickly, and even if a small amount leaks from the fuel tank, the risk of explosion is low if it can be quickly discharged to a large space. We simulated a hydrogen leak experiment with an opening in a closed space simulating a small garage with FDS, and showed that the hydrogen concentration time history can be reproduced with great accuracy. Applying this know-how, we are conducting research to reproduce the leakage behavior of gases such as hydrogen and carbon monoxide under various conditions.

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Introduction of Shinnosuke Nishiki