示例#1
0
def _pEqn(rho, thermo, UEqn, nNonOrthCorr, psi, U, mesh, phi, p,
          cumulativeContErr):
    from Foam.finiteVolume import volScalarField
    rUA = 1.0 / UEqn.A()
    U.ext_assign(rUA * UEqn.H())

    from Foam import fvc
    from Foam.finiteVolume import surfaceScalarField
    from Foam.OpenFOAM import word
    phid = surfaceScalarField(
        word("phid"),
        fvc.interpolate(thermo.psi()) *
        ((fvc.interpolate(U) & mesh.Sf()) + fvc.ddtPhiCorr(rUA, rho, U, phi)))

    for nonOrth in range(nNonOrthCorr + 1):
        from Foam import fvm
        pEqn = (fvm.ddt(psi, p) + fvm.div(phid, word("div(phid,p)")) -
                fvm.laplacian(rho * rUA, p))
        pEqn.solve()
        if (nonOrth == nNonOrthCorr):
            phi.ext_assign(pEqn.flux())
            pass
        pass
    from Foam.finiteVolume.cfdTools.compressible import rhoEqn
    rhoEqn(rho, phi)

    from Foam.finiteVolume.cfdTools.compressible import compressibleContinuityErrs
    cumulativeContErr = compressibleContinuityErrs(rho, thermo,
                                                   cumulativeContErr)

    U.ext_assign(U - rUA * fvc.grad(p))
    U.correctBoundaryConditions()

    return cumulativeContErr
示例#2
0
def _pEqn( rho, thermo, UEqn, nNonOrthCorr, psi, U, mesh, phi, p, cumulativeContErr ):
    from Foam.finiteVolume import volScalarField
    rUA = 1.0/UEqn.A()
    U.ext_assign( rUA*UEqn.H() )
            
    from Foam import fvc
    from Foam.finiteVolume import surfaceScalarField
    from Foam.OpenFOAM import word
    phid = surfaceScalarField( word( "phid" ), 
                               fvc.interpolate( thermo.psi() ) * ( (fvc.interpolate( U ) & mesh.Sf() ) + fvc.ddtPhiCorr( rUA, rho, U, phi ) ) )
    
    
    for nonOrth in range( nNonOrthCorr + 1 ) :
        from Foam import fvm
        pEqn = ( fvm.ddt(psi, p) + fvm.div(phid, word( "div(phid,p)" ) ) - fvm.laplacian(rho*rUA, p) )
        pEqn.solve()
        if (nonOrth == nNonOrthCorr) :
           phi.ext_assign( pEqn.flux() )
           pass
        pass
    from Foam.finiteVolume.cfdTools.compressible import rhoEqn
    rhoEqn( rho, phi )               
    
    from Foam.finiteVolume.cfdTools.compressible import compressibleContinuityErrs
    cumulativeContErr = compressibleContinuityErrs( rho, thermo, cumulativeContErr )
           
    U.ext_assign( U - rUA * fvc.grad(p) )
    U.correctBoundaryConditions()
    
    return cumulativeContErr
示例#3
0
def _pEqn( runTime, mesh, UEqn, thermo, p, psi, U, rho, phi, DpDt, g, initialMass, totalVolume, corr, nCorr, nNonOrthCorr, cumulativeContErr ): 
    closedVolume = p.needReference()
    rho.ext_assign( thermo.rho() )

    # Thermodynamic density needs to be updated by psi*d(p) after the
    # pressure solution - done in 2 parts. Part 1:
    thermo.rho().ext_assign( thermo.rho() - psi * p )
    
    rUA = 1.0/UEqn.A()
    from Foam.OpenFOAM import word
    from Foam.finiteVolume import surfaceScalarField
    from Foam import fvc
    rhorUAf = surfaceScalarField( word( "(rho*(1|A(U)))" ), fvc.interpolate( rho * rUA ) )

    U.ext_assign( rUA * UEqn.H() )

    phiU = fvc.interpolate( rho ) * ( (fvc.interpolate( U ) & mesh.Sf() ) + fvc.ddtPhiCorr( rUA, rho, U, phi ) ) 

    phi.ext_assign( phiU + rhorUAf * fvc.interpolate( rho ) * (g & mesh.Sf() ) )
    
    for nonOrth in range( nNonOrthCorr+1 ):
        
        from Foam import fvm
        from Foam.finiteVolume import correction
        pEqn = fvc.ddt( rho ) + psi * correction( fvm.ddt( p ) ) + fvc.div( phi ) - fvm.laplacian( rhorUAf, p )
        
        if corr == nCorr-1  and nonOrth == nNonOrthCorr:
           pEqn.solve( mesh.solver( word( str( p.name() ) + "Final" ) ) )
           pass
        else:
           pEqn.solve( mesh.solver( p.name() ) )
           pass
        if nonOrth == nNonOrthCorr:
           phi.ext_assign( phi + pEqn.flux() )
           pass

    # Second part of thermodynamic density update
    thermo.rho().ext_assign( thermo.rho() + psi * p )

    U.ext_assign( U + rUA * fvc.reconstruct( ( phi - phiU ) / rhorUAf ) )
    U.correctBoundaryConditions()
    
    DpDt.ext_assign( fvc.DDt( surfaceScalarField( word( "phiU" ), phi / fvc.interpolate( rho ) ), p ) )
    
    from Foam.finiteVolume.cfdTools.compressible import rhoEqn  
    rhoEqn( rho, phi )
    
    from Foam.finiteVolume.cfdTools.compressible import compressibleContinuityErrs
    cumulativeContErr = compressibleContinuityErrs( rho, thermo, cumulativeContErr )

    # For closed-volume cases adjust the pressure and density levels
    # to obey overall mass continuity
    if closedVolume:
       p.ext_assign( p + ( initialMass - fvc.domainIntegrate( psi * p ) ) / fvc.domainIntegrate( psi ) )
       thermo.rho().ext_assign(  psi * p )
       rho.ext_assign( rho + ( initialMass - fvc.domainIntegrate( rho ) ) / totalVolume )
       pass

    return cumulativeContErr
示例#4
0
def _pEqn(rho, thermo, UEqn, nNonOrthCorr, psi, U, mesh, phi, p, DpDt,
          cumulativeContErr, corr, nCorr, nOuterCorr, transonic):
    rho.ext_assign(thermo.rho())

    rUA = 1.0 / UEqn.A()
    U.ext_assign(rUA * UEqn.H())

    from Foam import fvc, fvm
    from Foam.OpenFOAM import word
    from Foam.finiteVolume import surfaceScalarField
    if transonic:
        phid = surfaceScalarField(
            word("phid"),
            fvc.interpolate(psi) * ((fvc.interpolate(U) & mesh.Sf()) +
                                    fvc.ddtPhiCorr(rUA, rho, U, phi)))

        for nonOrth in range(nNonOrthCorr + 1):
            pEqn = fvm.ddt(psi, p) + fvm.div(phid, p) - fvm.laplacian(
                rho * rUA, p)

            pEqn.solve()

            if nonOrth == nNonOrthCorr:
                phi == pEqn.flux()
                pass
            pass
        pass
    else:
        phi.ext_assign(
            fvc.interpolate(rho) * ((fvc.interpolate(U) & mesh.Sf()) +
                                    fvc.ddtPhiCorr(rUA, rho, U, phi)))

        for nonOrth in range(nNonOrthCorr + 1):
            pEqn = fvm.ddt(psi, p) + fvc.div(phi) - fvm.laplacian(rho * rUA, p)

            pEqn.solve()

            if nonOrth == nNonOrthCorr:
                phi.ext_assign(phi + pEqn.flux())
                pass
            pass
        pass

    from Foam.finiteVolume.cfdTools.compressible import rhoEqn
    rhoEqn(rho, phi)

    from Foam.finiteVolume.cfdTools.compressible import compressibleContinuityErrs
    cumulativeContErr = compressibleContinuityErrs(rho, thermo,
                                                   cumulativeContErr)

    U.ext_assign(U - rUA * fvc.grad(p))
    U.correctBoundaryConditions()

    DpDt.ext_assign(
        fvc.DDt(surfaceScalarField(word("phiU"), phi / fvc.interpolate(rho)),
                p))

    return cumulativeContErr
示例#5
0
def fun_pEqn( mesh, p, rho, psi, p_rgh, U, phi, ghf, gh, DpDt, UEqn, thermo, nNonOrthCorr, corr, nCorr, finalIter, cumulativeContErr ):
    
    rho.ext_assign( thermo.rho() )

    # Thermodynamic density needs to be updated by psi*d(p) after the
    # pressure solution - done in 2 parts. Part 1:
    thermo.rho().ext_assign( thermo.rho() - psi * p_rgh )

    rUA = 1.0 / UEqn.A()
    from Foam.finiteVolume import surfaceScalarField
    from Foam.OpenFOAM import word
    from Foam import fvc
    rhorUAf = surfaceScalarField( word( "(rho*(1|A(U)))" ), fvc.interpolate( rho * rUA ) )

    U.ext_assign( rUA*UEqn.H() )

    phi.ext_assign( fvc.interpolate( rho ) * ( ( fvc.interpolate( U ) & mesh.Sf() ) + fvc.ddtPhiCorr( rUA, rho, U, phi ) ) )

    buoyancyPhi = -rhorUAf * ghf * fvc.snGrad( rho ) * mesh.magSf()
    phi.ext_assign( phi + buoyancyPhi )
    
    from Foam import fvm
    from Foam.finiteVolume import correction
    for nonOrth in range( nNonOrthCorr +1 ):
        p_rghEqn = fvc.ddt( rho ) + psi * correction( fvm.ddt( p_rgh ) ) + fvc.div( phi ) - fvm.laplacian( rhorUAf, p_rgh )

        p_rghEqn.solve( mesh.solver( p_rgh.select( ( finalIter and corr == nCorr-1 and nonOrth == nNonOrthCorr ) ) ) )

        if nonOrth == nNonOrthCorr:
            # Calculate the conservative fluxes
            phi.ext_assign( phi + p_rghEqn.flux() )

            # Explicitly relax pressure for momentum corrector
            p_rgh.relax()

            # Correct the momentum source with the pressure gradient flux
            # calculated from the relaxed pressure
            U.ext_assign( U + rUA * fvc.reconstruct( ( buoyancyPhi + p_rghEqn.flux() ) / rhorUAf ) )
            U.correctBoundaryConditions()
            pass

    p.ext_assign( p_rgh + rho * gh )

    # Second part of thermodynamic density update
    thermo.rho().ext_assign( thermo.rho() + psi * p_rgh )

    DpDt.ext_assign( fvc.DDt( surfaceScalarField( word( "phiU" ), phi / fvc.interpolate( rho ) ), p ) )

    from Foam.finiteVolume.cfdTools.compressible import rhoEqn  
    rhoEqn( rho, phi )
    
    from Foam.finiteVolume.cfdTools.compressible import compressibleContinuityErrs
    cumulativeContErr = compressibleContinuityErrs( rho, thermo, cumulativeContErr )

    return cumulativeContErr
示例#6
0
def _pEqn( rho, thermo, UEqn, nNonOrthCorr, psi, U, mesh, phi, p, DpDt, cumulativeContErr, corr, nCorr, nOuterCorr, transonic ):
    rho.ext_assign( thermo.rho() )

    rUA = 1.0/UEqn.A()
    U.ext_assign( rUA * UEqn.H() )

    from Foam import fvc, fvm
    from Foam.OpenFOAM import word
    from Foam.finiteVolume import surfaceScalarField
    if transonic: 
       phid = surfaceScalarField( word( "phid" ), 
                                  fvc.interpolate( psi ) * ( ( fvc.interpolate( U ) & mesh.Sf() ) + fvc.ddtPhiCorr( rUA, rho, U, phi ) ) )
       
       for nonOrth in range( nNonOrthCorr + 1 ) :
           pEqn = fvm.ddt( psi, p ) + fvm.div( phid, p ) - fvm.laplacian( rho * rUA, p )
           
           pEqn.solve()
           
           if nonOrth == nNonOrthCorr:
              phi == pEqn.flux()
              pass
           pass
       pass
    else:
       phi.ext_assign( fvc.interpolate( rho ) * ( ( fvc.interpolate(U) & mesh.Sf() ) + fvc.ddtPhiCorr( rUA, rho, U, phi ) ) )
       
       for nonOrth in range( nNonOrthCorr + 1 ) :
           pEqn = fvm.ddt( psi, p ) + fvc.div( phi ) - fvm.laplacian( rho * rUA, p )
           
           pEqn.solve()
                      
           if nonOrth == nNonOrthCorr:
              phi.ext_assign( phi + pEqn.flux() )
              pass
           pass
       pass
        
    from Foam.finiteVolume.cfdTools.compressible import rhoEqn
    rhoEqn( rho, phi )
    
    from Foam.finiteVolume.cfdTools.compressible import compressibleContinuityErrs
    cumulativeContErr = compressibleContinuityErrs( rho, thermo, cumulativeContErr )

    U.ext_assign( U - rUA * fvc.grad( p ) )
    U.correctBoundaryConditions()
    
    DpDt.ext_assign( fvc.DDt( surfaceScalarField( word( "phiU" ), phi / fvc.interpolate( rho ) ), p ) )

    return cumulativeContErr
示例#7
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def fun_pEqn(mesh, thermo, p, rho, psi, U, phi, DpDt, pMin, UEqn, mrfZones,
             nNonOrthCorr, nCorr, oCorr, nOuterCorr, corr, transonic,
             cumulativeContErr):

    rho.ext_assign(thermo.rho())
    rUA = 1.0 / UEqn.A()
    U.ext_assign(rUA * UEqn.H())

    if nCorr <= 1:
        UEqn.clear()
        pass

    if transonic:
        from Foam.finiteVolume import surfaceScalarField
        from Foam.OpenFOAM import word
        phid = surfaceScalarField(
            word("phid"),
            fvc.interpolate(psi) * ((fvc.interpolate(U) & mesh.Sf()) +
                                    fvc.ddtPhiCorr(rUA, rho, U, phi)))
        mrfZones.relativeFlux(fvc.interpolate(psi), phid)

        from Foam import fvm
        for nonOrth in range(nNonOrthCorr + 1):
            pEqn = fvm.ddt(psi, p) + fvm.div(phid, p) - fvm.laplacian(
                rho * rUA, p)

            if oCorr == (nOuterCorr - 1) and (corr == nCorr -
                                              1) and (nonOrth == nNonOrthCorr):
                from Foam.OpenFOAM import word
                pEqn.solve(mesh.solver(word("pFinal")))
                pass
            else:
                pEqn.solve()
                pass

        if nonOrth == nNonOrthCorr:
            phi == pEqn.flux()
            pass

    else:
        from Foam import fvc
        phi.ext_assign(
            fvc.interpolate(rho) * ((fvc.interpolate(U) & mesh.Sf())))
        mrfZones.relativeFlux(fvc.interpolate(rho), phi)

        from Foam import fvm
        for nonOrth in range(nNonOrthCorr + 1):
            # Pressure corrector
            pEqn = fvm.ddt(psi, p) + fvc.div(phi) - fvm.laplacian(rho * rUA, p)

            if oCorr == (nOuterCorr - 1) and corr == (
                    nCorr - 1) and nonOrth == nNonOrthCorr:
                from Foam.OpenFOAM import word
                pEqn.solve(mesh.solver(word("pFinal")))
                pass
            else:
                pEqn.solve()
                pass

            if nonOrth == nNonOrthCorr:
                phi.ext_assign(phi + pEqn.flux())
                pass
            pass

    from Foam.finiteVolume.cfdTools.compressible import rhoEqn
    rhoEqn(rho, phi)

    from Foam.finiteVolume.cfdTools.compressible import compressibleContinuityErrs
    cumulativeContErr = compressibleContinuityErrs(rho, thermo,
                                                   cumulativeContErr)

    # Explicitly relax pressure for momentum corrector
    p.relax()

    rho.ext_assign(thermo.rho())
    rho.relax()

    from Foam.OpenFOAM import ext_Info, nl
    ext_Info() << "rho max/min : " << rho.ext_max().value(
    ) << " " << rho.ext_min().value() << nl

    U.ext_assign(U - rUA * fvc.grad(p))
    U.correctBoundaryConditions()

    from Foam.finiteVolume import surfaceScalarField
    from Foam.OpenFOAM import word
    DpDt.ext_assign(
        fvc.DDt(surfaceScalarField(word("phiU"), phi / fvc.interpolate(rho)),
                p))

    from Foam.finiteVolume import bound
    bound(p, pMin)

    pass
示例#8
0
def _pEqn(
    rho,
    thermo,
    UEqn,
    nNonOrthCorr,
    psi,
    U,
    mesh,
    phi,
    p,
    DpDt,
    pMin,
    corr,
    cumulativeContErr,
    nCorr,
    oCorr,
    nOuterCorr,
    transonic,
):
    rho.ext_assign(thermo.rho())

    rUA = 1.0 / UEqn.A()
    U.ext_assign(rUA * UEqn.H())

    if nCorr <= 1:
        UEqn.clear()
        pass

    from Foam import fvc, fvm
    from Foam.OpenFOAM import word
    from Foam.finiteVolume import surfaceScalarField

    if transonic:

        phid = surfaceScalarField(
            word("phid"), fvc.interpolate(psi) * ((fvc.interpolate(U) & mesh.Sf()) + fvc.ddtPhiCorr(rUA, rho, U, phi))
        )

        for nonOrth in range(nNonOrthCorr + 1):
            pEqn = fvm.ddt(psi, p) + fvm.div(phid, p) - fvm.laplacian(rho * rUA, p)

            if oCorr == nOuterCorr - 1 and corr == nCorr - 1 and nonOrth == nNonOrthCorr:
                pEqn.solve(mesh.solver(word("pFinal")))
                pass
            else:
                pEqn.solve()
                pass
            if nonOrth == nNonOrthCorr:
                phi == pEqn.flux()
                pass
            pass
        pass
    else:
        phi.ext_assign(fvc.interpolate(rho) * ((fvc.interpolate(U) & mesh.Sf())))

        for nonOrth in range(nNonOrthCorr + 1):
            # Pressure corrector
            pEqn = fvm.ddt(psi, p) + fvc.div(phi) - fvm.laplacian(rho * rUA, p)
            if oCorr == nOuterCorr - 1 and corr == nCorr - 1 and nonOrth == nNonOrthCorr:
                pEqn.solve(mesh.solver(word("pFinal")))
                pass
            else:
                pEqn.solve()
                pass

            if nonOrth == nNonOrthCorr:
                phi.ext_assign(phi + pEqn.flux())
                pass
            pass
        pass

    from Foam.finiteVolume.cfdTools.compressible import rhoEqn

    rhoEqn(rho, phi)

    from Foam.finiteVolume.cfdTools.compressible import compressibleContinuityErrs

    cumulativeContErr = compressibleContinuityErrs(rho, thermo, cumulativeContErr)

    p.relax()

    rho.ext_assign(thermo.rho())
    rho.relax()
    from Foam.OpenFOAM import ext_Info, nl

    ext_Info() << "rho max/min : " << rho.ext_max().value() << " " << rho.ext_min().value() << nl

    U.ext_assign(U - rUA * fvc.grad(p))
    U.correctBoundaryConditions()

    DpDt.ext_assign(fvc.DDt(surfaceScalarField(word("phiU"), phi / fvc.interpolate(rho)), p))

    from Foam.finiteVolume import bound

    bound(p, pMin)

    return cumulativeContErr
示例#9
0
def _pEqn(runTime, mesh, UEqn, thermo, p, psi, U, rho, phi, DpDt, g,
          initialMass, totalVolume, corr, nCorr, nNonOrthCorr,
          cumulativeContErr):
    closedVolume = p.needReference()
    rho.ext_assign(thermo.rho())

    # Thermodynamic density needs to be updated by psi*d(p) after the
    # pressure solution - done in 2 parts. Part 1:
    thermo.rho().ext_assign(thermo.rho() - psi * p)

    rUA = 1.0 / UEqn.A()
    from Foam.OpenFOAM import word
    from Foam.finiteVolume import surfaceScalarField
    from Foam import fvc
    rhorUAf = surfaceScalarField(word("(rho*(1|A(U)))"),
                                 fvc.interpolate(rho * rUA))

    U.ext_assign(rUA * UEqn.H())

    phiU = fvc.interpolate(rho) * (
        (fvc.interpolate(U) & mesh.Sf()) + fvc.ddtPhiCorr(rUA, rho, U, phi))

    phi.ext_assign(phiU + rhorUAf * fvc.interpolate(rho) * (g & mesh.Sf()))

    for nonOrth in range(nNonOrthCorr + 1):

        from Foam import fvm
        from Foam.finiteVolume import correction
        pEqn = fvc.ddt(rho) + psi * correction(
            fvm.ddt(p)) + fvc.div(phi) - fvm.laplacian(rhorUAf, p)

        if corr == nCorr - 1 and nonOrth == nNonOrthCorr:
            pEqn.solve(mesh.solver(word(str(p.name()) + "Final")))
            pass
        else:
            pEqn.solve(mesh.solver(p.name()))
            pass
        if nonOrth == nNonOrthCorr:
            phi.ext_assign(phi + pEqn.flux())
            pass

    # Second part of thermodynamic density update
    thermo.rho().ext_assign(thermo.rho() + psi * p)

    U.ext_assign(U + rUA * fvc.reconstruct((phi - phiU) / rhorUAf))
    U.correctBoundaryConditions()

    DpDt.ext_assign(
        fvc.DDt(surfaceScalarField(word("phiU"), phi / fvc.interpolate(rho)),
                p))

    from Foam.finiteVolume.cfdTools.compressible import rhoEqn
    rhoEqn(rho, phi)

    from Foam.finiteVolume.cfdTools.compressible import compressibleContinuityErrs
    cumulativeContErr = compressibleContinuityErrs(rho, thermo,
                                                   cumulativeContErr)

    # For closed-volume cases adjust the pressure and density levels
    # to obey overall mass continuity
    if closedVolume:
        p.ext_assign(p + (initialMass - fvc.domainIntegrate(psi * p)) /
                     fvc.domainIntegrate(psi))
        thermo.rho().ext_assign(psi * p)
        rho.ext_assign(rho +
                       (initialMass - fvc.domainIntegrate(rho)) / totalVolume)
        pass

    return cumulativeContErr
示例#10
0
def fun_pEqn(mesh, p, rho, psi, p_rgh, U, phi, ghf, gh, DpDt, UEqn, thermo,
             nNonOrthCorr, corr, nCorr, finalIter, cumulativeContErr):

    rho.ext_assign(thermo.rho())

    # Thermodynamic density needs to be updated by psi*d(p) after the
    # pressure solution - done in 2 parts. Part 1:
    thermo.rho().ext_assign(thermo.rho() - psi * p_rgh)

    rUA = 1.0 / UEqn.A()
    from Foam.finiteVolume import surfaceScalarField
    from Foam.OpenFOAM import word
    from Foam import fvc
    rhorUAf = surfaceScalarField(word("(rho*(1|A(U)))"),
                                 fvc.interpolate(rho * rUA))

    U.ext_assign(rUA * UEqn.H())

    phi.ext_assign(
        fvc.interpolate(rho) *
        ((fvc.interpolate(U) & mesh.Sf()) + fvc.ddtPhiCorr(rUA, rho, U, phi)))

    buoyancyPhi = -rhorUAf * ghf * fvc.snGrad(rho) * mesh.magSf()
    phi.ext_assign(phi + buoyancyPhi)

    from Foam import fvm
    from Foam.finiteVolume import correction
    for nonOrth in range(nNonOrthCorr + 1):
        p_rghEqn = fvc.ddt(rho) + psi * correction(
            fvm.ddt(p_rgh)) + fvc.div(phi) - fvm.laplacian(rhorUAf, p_rgh)

        p_rghEqn.solve(
            mesh.solver(
                p_rgh.select((finalIter and corr == nCorr - 1
                              and nonOrth == nNonOrthCorr))))

        if nonOrth == nNonOrthCorr:
            # Calculate the conservative fluxes
            phi.ext_assign(phi + p_rghEqn.flux())

            # Explicitly relax pressure for momentum corrector
            p_rgh.relax()

            # Correct the momentum source with the pressure gradient flux
            # calculated from the relaxed pressure
            U.ext_assign(U + rUA * fvc.reconstruct(
                (buoyancyPhi + p_rghEqn.flux()) / rhorUAf))
            U.correctBoundaryConditions()
            pass

    p.ext_assign(p_rgh + rho * gh)

    # Second part of thermodynamic density update
    thermo.rho().ext_assign(thermo.rho() + psi * p_rgh)

    DpDt.ext_assign(
        fvc.DDt(surfaceScalarField(word("phiU"), phi / fvc.interpolate(rho)),
                p))

    from Foam.finiteVolume.cfdTools.compressible import rhoEqn
    rhoEqn(rho, phi)

    from Foam.finiteVolume.cfdTools.compressible import compressibleContinuityErrs
    cumulativeContErr = compressibleContinuityErrs(rho, thermo,
                                                   cumulativeContErr)

    return cumulativeContErr