- #1

elle

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**Graph function help please - fluid mechanics/streamlines related**

I'm not too sure whether I should have posted this in the Physics section or in the maths Please move this topic if its in the wrong place!

this probably seems like a silly question but is it possible to plot x*y + c on a graph where c = a constant? I'm working on a question on fluid mechanics where I have to find the streamfunction and plot the stream lines. However I'm in doubt whether i have done the question correctly in the first place.

Please help!

## Homework Statement

For the 2D velocity field

**u**= x

**i**- y

**j**find the streamfunction 'psi' (apologises, I'm not too familiar with Latex)

## Homework Equations

given above

## The Attempt at a Solution

After partially differentiating and using formulas from my notes, i got psi = x*y + c