| 1. | The flow velocity is again equal to, with the velocity potential.
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| 2. | Which is a linear wave equation for the velocity potential.
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| 3. | Insisting on bounded solutions the velocity potential in each layer is
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| 4. | The real part is the velocity potential and the imaginary part is the stream function.
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| 5. | The calculation of the velocity potential under such situation can be found in this reference.
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| 6. | So \ phi can be identified as the velocity potential and is called the stream function.
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| 7. | A velocity potential is not unique.
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| 8. | There is a similar equation for velocity potential in fluid flow and temperature in heat transfer.
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| 9. | Imposing one BC or the other implies calculating the local velocity or the local velocity potential.
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| 10. | Note that the second-and third-order terms in the velocity potential ? are zero.
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