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Hello everyone, I am quite struggling with a question from a problem sheet. I have looked information regarding to this but I still have a hard time visualizing this and sketching it. 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. Any help with this would be much appreciated as well as any sources that have further information on this topic.