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  2. Lagrangian and Eulerian specification of the flow field

    en.wikipedia.org/wiki/Lagrangian_and_Eulerian...

    File:Lagrangian vs Eulerian [further explanation needed] Eulerian perspective of fluid velocity versus Lagrangian depiction of strain.. In classical field theories, the Lagrangian specification of the flow field is a way of looking at fluid motion where the observer follows an individual fluid parcel as it moves through space and time.

  3. Swarm behaviour - Wikipedia

    en.wikipedia.org/wiki/Swarm_behaviour

    The Eulerian approach views the swarm as a field, working with the density of the swarm and deriving mean field properties. It is a hydrodynamic approach, and can be useful for modelling the overall dynamics of large swarms. [26] [27] [28] However, most models work with the Lagrangian approach, which is an agent-based model following the ...

  4. Lagrangian–Eulerian advection - Wikipedia

    en.wikipedia.org/wiki/LagrangianEulerian...

    In scientific visualization, LagrangianEulerian advection is a technique mainly used for the visualization of unsteady flows. The computer graphics generated by the technique can help scientists visualize changes in velocity fields. This technique uses a hybrid Lagrangian and Eulerian specification of the flow field.

  5. Lagrangian (field theory) - Wikipedia

    en.wikipedia.org/wiki/Lagrangian_(field_theory)

    In field theory, the independent variable is replaced by an event in spacetime (x, y, z, t), or more generally still by a point s on a Riemannian manifold.The dependent variables are replaced by the value of a field at that point in spacetime (,,,) so that the equations of motion are obtained by means of an action principle, written as: =, where the action, , is a functional of the dependent ...

  6. Multiphase particle-in-cell method - Wikipedia

    en.wikipedia.org/wiki/Multiphase_particle-in...

    The transfer of particle properties between the Lagrangian particle space and the Eulerian grid is performed using linear interpolation functions. Assuming a rectilinear grid consisting of rectangular cuboid cells, the scalar particle properties are interpolated to the cell centers while the vector properties are interpolated to cell faces. In ...

  7. Material point method - Wikipedia

    en.wikipedia.org/wiki/Material_Point_Method

    Purely Lagrangian methods employ a framework in which a space is discretised into initial subvolumes, whose flowpaths are then charted over time. Purely Eulerian methods, on the other hand, employ a framework in which the motion of material is described relative to a mesh that remains fixed in space throughout the calculation. As the name ...

  8. Lagrangian system - Wikipedia

    en.wikipedia.org/wiki/Lagrangian_system

    A Lagrangian density L (or, simply, a Lagrangian) of order r is defined as an n-form, n = dim X, on the r-order jet manifold J r Y of Y. A Lagrangian L can be introduced as an element of the variational bicomplex of the differential graded algebra O ∗ ∞ ( Y ) of exterior forms on jet manifolds of Y → X .

  9. Lagrangian ocean analysis - Wikipedia

    en.wikipedia.org/wiki/Lagrangian_Ocean_Analysis

    Often, the Eulerian velocity field used as an input for Lagrangian ocean analysis has been computed using an ocean general circulation model (OGCM). [1] Lagrangian techniques can be employed on a range of scales, from modelling the dispersal of biological matter within the Great Barrier Reef [ 2 ] to global scales. [ 3 ]