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Which of the following frame of references does this diagram represent?

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Which of the following frame of references does this diagram represent?

(a) Polar

(b) Cartesian

(c) Lagrangian

(d) Eulerian

I have been asked this question by my school principal while I was bunking the class.

This interesting question is from Governing Equations topic in chapter Governing Equations of Fluid Dynamics of Computational Fluid Dynamics

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Best answer
Right choice is (d) Eulerian

The best explanation: In diagram, fluid particles move and the field of observation remains in the same position. This represents Eulerian Approach.

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