If i create velocity modulation at the inlet of a pipe will the modulation dampen at a length far away from inlet?

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U. Dreher

I expect so - depending on frequencies, material and dimensions of the pipe etc.

Larry L. Baxter

The fluctuations dampen with distance, but for incompressible fluids they dampen slowly. They are pressure waves, but they have velocities in the fluid much higher than in air and they only minimally displace molecules so they dampen slowly.

Filippo Maria Denaro

Could you better details your problem? For example what about the Re number? How do you create the fluctuations?