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Calculation of motion continuity error

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Old   July 25, 2013, 04:41
Default Calculation of motion continuity error
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Sasan Ghomi
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Hi Dear Foamers,

I am trying to understand calculating of motion continuity error.
I think first line in below code is creating an object without any dimension and I don't understand the meaning of [d/dt ( Object ) ] . Also I couldn't understand what do meshPhi(U) do exactly .
volScalarField motionContErr =
        fvc::ddt(dimensionedScalar("1", dimless, 1.0), mesh)
      - fvc::div(fvc::meshPhi(U));
Can anybody help me for understanding this code?
I appreciate any help from you.

Thanks and best regards,
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