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#1 |
New Member
Xuekun Lu
Join Date: Oct 2015
Posts: 20
Rep Power: 11 ![]() |
Hello,
I am modelling a laminar incompressible flow in the S pipe. The inlet velocity is quite small, generating Re=500, pressure outlet = 1 atm. Initial condition is P=1 atm. Why the static pressure is larger at the inlet than the outlet? Is this because the velocity at inlet is lower than outlet so Bernoulli's equation calculated a larger static pressure? Is my understanding correct? The pressures I defined in the beginning is the static pressure or total pressure? I need your help ! Thanks ! [IMG] ![]() [IMG] ![]() |
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#2 |
New Member
Sarang
Join Date: Oct 2015
Posts: 22
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If you are specifying velocity at the inlet and a static pressure at the outlet then then I would expect the static pressure to be high to drive the flow through the outlet.
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#3 |
New Member
Xuekun Lu
Join Date: Oct 2015
Posts: 20
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Hi, thanks a lot for your reply. I just wander how the solver calculate the static pressure higher at inlet than outlet since I define the initial condition is 1 atm, same as outlet. Is this 1 atm the static or total pressure?
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#4 |
New Member
Sarang
Join Date: Oct 2015
Posts: 22
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As you said it is just an initial condition. Your initial conditions gets washed way as your simulation progresses. Initial conditions should not affect your end solution for a continuous flow problem (You might get convergence issues if they are set really bad).
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#5 |
Senior Member
Matt
Join Date: Aug 2014
Posts: 947
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you must have a pressure gradient to have velocity (i.e. flow).
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Tags |
bernoulli's equation, pressure, pressure and velocity, static pressure |
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