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compute U in p.Eqn in interfoam

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Old   March 11, 2013, 05:48
Default compute U in p.Eqn in interfoam
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Hi to all,
i am a bit confused in the computed of U in the pEqn.H of interFoam
why is computed as follow?
U += rAU*fvc::reconstruct((phi - phiU)/rAUf)

I compare it with the PISO algorithm in wich U is computed as:
U -= rUA*fvc::grad(p);

thanks to all
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