# EulerLagrangeMapping

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 November 13, 2006, 05:11 Dear All, does OpenFoam inc #1 Senior Member   Stephan Gerber Join Date: Mar 2009 Location: Germany Posts: 118 Rep Power: 10 Sponsored Links Dear All, does OpenFoam include an Euler-Lagrange-Mapping? I want to map (and maybe smooth too) Lagrangian particle data on an Eulerian Phase. Did anybody do this already or are there any suggestion where to start with this problem? any help would be appreciated! Stephan

 November 13, 2006, 05:39 Hi Stephen. I create an alpha- #2 Senior Member   Rasmus Hemph Join Date: Mar 2009 Location: Sweden Posts: 108 Rep Power: 10 Hi Stephen. I create an alpha-field from lagrangian data using the code below. Hope it is of some help! volScalarField Np ( IOobject ( "Np", runTime.timeName(), mesh, IOobject::NO_READ, IOobject::NO_WRITE ), U.mesh(), dimensionedScalar("zero", dimensionSet(0, 0, 0, 0, 0), 0.0), U.boundaryField().types() ); //reset alpha and Ua at each fluid timestep alpha = dimensionedScalar("zero", alpha.dimensions(), 0.0); for ( discretePhase::iterator elmnt = particles.begin(); elmnt != particles.end(); ++elmnt ) { label celli = elmnt().cell(); scalar d = elmnt().d(); Np[celli] = Np[celli] + 1; scalar dVol = M_PI*::pow(d, 3.0)/6.0; alpha[celli] += dVol/mesh.V()[celli]; } //Rasmus

 November 13, 2006, 06:21 Thanks Rasmus, i have alrea #3 Senior Member   Stephan Gerber Join Date: Mar 2009 Location: Germany Posts: 118 Rep Power: 10 Thanks Rasmus, i have already something similar but what i actually need is a real mapping algorithm, which takes care of the fact, that parts of a particle are in different cells. the fields obtained in this way should be smoother. this would be nice for time derivatives of the above mentioned field Np. thanks for the help! does anybody else has an idea how to get such smooth lagrangian fields?! any help would be appreciated Stephan

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