The velocity potential for a certain flow field is \emptyset=A x y Take the A to be the last number of non-zero digits of your ID. (e.g. w30027530 would give

3) (a) Determine the corresponding stream function and the velocity field. Explain the procedure (b) Drawing the streamlines for this flow field, using Excel or cuadriculated paper. Indicate the direction of the flow along the streamlines. Suggest a natural phenomenon where you can find this kind of flow. (Max word 100).[10 marks] (c) Is this flow rotational flow? Justify your answer (Max 100 words).