【Daily Question】Theoretical Foundation 2020.11.23
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Multiple-choice question: The question is shown in the image ( ). Answer: B. Hint: An additional reward will be given to those who can explain the solution process; the answer can be submitted there
Correct answer: B. When a fluid flows over a flat plate, the flow field can be divided into a boundary layer region and a main flow region; in the boundary layer region, the viscosity of the fluid plays a dominant role. During the flow over a flat plate, if the plate is not long enough and the boundary layer does not separate upon reaching the edge of the plate, turbulence will not be formed; as a result, the boundary layer can alternately be in a laminar state and a turbulent state, rather than necessarily including both laminar and turbulent phases ； If the plate length increases, the fluid will transition from a laminar state to a turbulent state and will not reach stability.