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Velocity appear at zero timestep.

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Old   January 18, 2017, 21:18
Question Velocity appear at zero timestep.
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Hello, everyone.

I am a beginner of FLUENT and now simulating a impinging jet with axisymmetric method.

I set a velocity inlet boundary conditions at the bottom of a cylinder.

At zero timestep of the result, velocity appear a little at inlet boundary.
Why the velocity can appear at very beginning?

Could someone explain it?
Thank you!
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