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Question about phi

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Old   April 15, 2017, 04:13
Default Question about phi
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What is the physical sense of phi in the momentum equation for incompressible and compressible fluids?
According to my deductions phi has relation to the components of the vector U = [u v w], so in the compressible case phi has the following physical sense in the moment equation for compressible flow:

phi = rho * u (x coordinate); phi = rho * v (y-coordinate); phi = rho * w (z-coordinate)

For the moment equation for incompressible fluid:

phi = u (x coordinate); phi = v (y-coordinate); phi = w (z-coordinate)

Because for incompressible fluid, the momentum equation is divided by density.

Is my deductions correct?
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