Question

Consider a fixed point in a flow. The locus of all the point passed through this fixed point is called as _________

(a) stream-line

(b) pathline

(c) streak lines

(d) stream tubes

I have been asked this question in class test.

I would like to ask this question from Uniform Flow topic in section Inviscid & Incompressible Flow of Aerodynamics

Answer 1

Right option is (c) streak lines

For explanation I would say: The locus of all the points that have passed through a fixed point is called a streak line. The flow will pass through a fixed point to any other point at any instant. The locus of these points is streamline.