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Boundary Condition for Pump simulation for Zero Head Condition

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Old   March 26, 2017, 03:25
Default Boundary Condition for Pump simulation for Zero Head Condition
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Himanshu
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Hello all,
I have doubt in boundary condition which should be applied in pump simulation for zero head rise condition( i.e. rise in head total head in flow is zero,∆H=0). This simulation is to draw the performance curve of pump. For the first point of the curve, the ∆H is zero and i have to find what will the volume discharge rate from outlet. Now, I have gone through various journal and papers and I have noted that they use pressure inlet(which is the total pressure) and pressure outlet(which is a static pressure) as boundary condition and they have use both value as Zero.
Now, my doubt is that if we see the net head rise formula,
∆H= total pressure at outlet-total pressure at inlet
i.e, ∆H=static pressure head at outlet+dynamic pressure head at outlet-total pressure head at inlet.
Now, if we substitute the boundary condition on the the equation we get some value of dynamic head at outlet.
i.e., ∆H=0+dynamic head at outlet-0
∆H= dynamic head at outlet
hence, we can clearly say that ∆H≠0.
Can anyone clarify my doubt or can give any other boundary condition?
Sorry for long post and a silly question, I am new to CFD.
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