In this state of emergency, as one of the measures to be implemented in the target area, we will call attention to group drinking on the streets and in parks as an action with a high risk of infection.
In the simulation of the supercomputer "Tomitake", the result is that if you talk outdoors without a mask, the flying will spread, and experts are calling attention.
A group such as RIKEN is using the latest supercomputer "Tomitake" to simulate what kind of risks there are in outdoor conversations and how the flight spreads in such situations.
In the simulation, we assumed a scene where 10 people were eating and drinking in a circle around a table outdoors.
If the distance between the people facing each other is 1 meter and the person without a mask talks loudly for 30 seconds in a windless state with no wind, the person in front and the three people on both sides will be exposed to the fly. The result was that.
Also, if a breeze of 0.5 meters per second is blowing, the small flying splatters will spread to the surrounding area, and a total of 6 people, including those in front and downwind, will be exposed to the flying splatters.
If the loud person wore a mask, the people around him wouldn't be hit.
The group also simulated the case where the distance between the people facing each other was increased to 1.7 meters.
As a result, when yelling out without a mask when the wind was not blowing, the amount of flying was reduced by half compared to when the distance was 1 meter, but the front and the three people on both sides of it still flew. The result was a bath.
Makoto Tsubokura, a professor at Kobe University who summarized the simulation, said, "Even outdoors, we cannot expect the effect of ventilation in situations where we approach and discuss, and depending on how the wind blows, it is better than indoors. There is a high risk of infection. When interacting with people, it is important to wear a mask both indoors and outdoors and keep a distance so that measures are not loosened. "