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Old   September 15, 2012, 03:48
Default flow in cylinder
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Hi every body!

I would be so thankful if any body could help me about the physical solution of

in-compressible flow in cylinder.

a flow is at rest in the initial and suddenly a piston at left end of cylinder starts

to move with constant speed of Vpiston, what would be velocity and pressure values in cylinder?
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Old   September 15, 2012, 09:25
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I would expect that the entire column of fluid would instantly start moving with the piston at a velocity Vpiston (because of incompressibility) and a slug profile. Over time a fully-developed profile would develop ahead of the piston. Look at the problem in the frame of the piston. Then the cylinder would start moving toward the piston with a velocity -Vpiston.
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Old   September 15, 2012, 11:43
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it seems that your comment is correct, but when I want to solve it numerically with control volume scheme it takes time to reach the constant velocity, and it doesn't instantly moves to answer, I would be thankful if you could help me
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