I'm seeking help in understanding Kirchoff-Helmholtz Integral.(adsbygoogle = window.adsbygoogle || []).push({});

Actually what i am facing the problem here is,

i don't understand certain things about Green's 2nd identity which stated that two scalar function can be interchanged,

and forming the force [tex]F = \phi\nabla\varphi - \varphi\nabla\phi[/tex],

however, i understand that [tex]\phi\nabla\varphi[/tex] represents the velocity of sound vibration across the surface to an observer point.

For say, if i take [tex] \phi [/tex] as Green's function and [tex] \varphi [/tex] as Sound potential / pressure.

So the problem comes,

how would i understand [tex]\varphi\nabla\phi[/tex]? distribution of sound pressure with impulse unit at the observer point?

Then why do i need to subtract it ?

Are they equivalent?

How does reciprocal theorem applies here at the [tex]\varphi\nabla\phi[/tex]?

It just seems very confusing to me,

hope someone could point out as i'm really stucked in this topic for months.

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# Green's Function - Kirchoff Helmholtz Integral Problem

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