Hello everyone, I am quite struggling with a question that I received on a problem sheet. I have looked information regarding to this but I still have a hard time visualizing this and sketching it. 1. The problem statement, all variables and given/known data In the question I am asked to describe using a sketch how flow separation from the cylinder may be simulated by the addition of isolated vortices and explain how vortices can be used to complete the flow. In a separate point it asks again on a sketch to show how the separation points affect the drag component of force. 2. Relevant equations Unfortunately I unsure as how to proceed in this situation. 3. The attempt at a solution My attempt at a solution revolved around using the Method if images but so far I have not been able to reach a solution. Any assistance or indication to the relevant literature to this exercise would be much appreciated. I am new to this site and still familiarizing myself with the rules and FAQ, if I have broken any of them I apologize. Thank you for your help on this matter.