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__NOTOC__ In classical field theory the Lagrangian specification of the field is a way of looking at fluid motion where the observer follows an individual fluid parcel as it moves through space and time.〔Batchelor (1973) pp. 71–73.〕〔Lamb (1994) §3–§7 and §13–§16.〕 Plotting the position of an individual parcel through time gives the pathline of the parcel. This can be visualized as sitting in a boat and drifting down a river. The Eulerian specification of the flow field is a way of looking at fluid motion that focuses on specific locations in the space through which the fluid flows as time passes.〔〔 This can be visualized by sitting on the bank of a river and watching the water pass the fixed location. The Lagrangian and Eulerian specifications of the flow field are sometimes loosely denoted as the Lagrangian and Eulerian frame of reference. However, in general both the Lagrangian and Eulerian specification of the flow field can be applied in any observer's frame of reference, and in any coordinate system used within the chosen frame of reference. ==Description== In the ''Eulerian specification'' of a field, it is represented as a function of position x and time ''t''. For example, the flow velocity is represented by a function : On the other hand, in the ''Lagrangian specification'', individual fluid parcels are followed through time. The fluid parcels are labelled by some (time-independent) vector field x0. (Often, x0 is chosen to be the center of mass of the parcels at some initial time ''t0''. It is chosen in this particular manner to account for the possible changes of the shape over time. Therefore the center of mass is a good parametrization of the flow velocity u of the parcel.)〔 In the Lagrangian description, the flow is described by a function : giving the position of the parcel labeled x0 at time ''t''. The two specifications are related as follows:〔 : because both sides describe the velocity of the parcel labeled x0 at time ''t''. Within a chosen coordinate system, x0 and x are referred to as the Lagrangian coordinates and Eulerian coordinates of the flow. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Lagrangian and Eulerian specification of the flow field」の詳細全文を読む スポンサード リンク
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