Translation.

Any velocity field of the form


\begin{displaymath}V_{x} = U
\end{displaymath}

and


\begin{displaymath}V_{y} = V,
\end{displaymath}

just translates any given material element of the fluid. To illustrate this, the user can use the vector field manipulation application. Type the vector field above in the appropriate text boxes, but with $U= V = 1$. Then input in the display area, by mouse clicking, a square contour. Then change the value of time in the text box Input t, and then click the Draw button. As a result the contour is translated by the vector field. Repeat it as many times you want.



Karl P Burr
2003-07-07