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Old   April 16, 2008, 16:29
Default Velocity changes
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ro
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I want to simulate the 3D flow in channel I used the inlet velocity and pressure outlet as a inlet and outlet B.C and specifying constant value for velocity at the inlet But after calcuations when I calculate the velocity at the outlet by surface integral I found the value of velocity in the outlet differ from its value at the inlet.Why this happened ? and is the momentume is not conserved here? Thank you
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Old   April 19, 2008, 10:31
Default Re: Velocity changes
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vk
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you have to check the mass flow to check the conservation. velocity will differ because of low velocity near the wall.
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Old   April 19, 2008, 13:41
Default Re: Velocity changes
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ro
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I know that the velocity is increase untile reaching the fully develop region but I speaking about the mean velocity which must be remain constant as I know from the fluid mechanics.But in my case it changed from inlet to outlet my question is whay this happened

Thank you alot
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Old   April 21, 2008, 12:20
Default Re: Velocity changes
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vk
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hHve you defined the material as compressible (ideal gas)?. Whether the area inlet and outlet are same?
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Old   April 21, 2008, 12:21
Default Re: Velocity changes
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vk
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have you defined the material as compressible (ideal gas)?. Whether the area inlet and outlet are same?
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