Initially there is one locator that represents source flow at the origin, labeled "(1) ... = 1". The first 1 is the current number of the locator. The symbol ... , ... , or ... is an abbreviation for source, vortex, or doublet, respectively. The last 1 is the value of the slider "strength". Positive and negative strengths appear with yellow and green backgrounds, respectively. To create a new elementary flow select one of the buttons "source", "vortex", or "doublet" and place a locator. Deleting a locator reorders the numbers and the "point number" becomes 0. The popup menu lets you: • select the locator with the current "point number" • "change flow" of the "point number" locator by the one corresponding to the active "source", "vortex", or "doublet" button • add values of the horizontal uniform velocity ... or/and vertical uniform velocity ... • change the axes scale to vary the range of the plot in steps from ... up to ...


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