How is the straight-through flow generated?

The geographical principle of the formation of through flow is thermal cycle.

For example, the vegetation on the north side of the hall and the cement floor on the south side have different thermal properties, so the heating is uneven during the day and at night, resulting in thermal cycle.

Thermodynamic cycle, that is, air cycle formed by uneven ground temperature, is called thermodynamic cycle. This is a simple form of atmospheric motion. Application: Kongming lanterns and hot air balloons are heated by the principle of thermal cycle; Radiators and electric oil lamps use the principle of thermal cycle to raise the room temperature.