Transcription of FLUID MECHANICS TUTORIAL No. 3 BOUNDARY LAYER THEORY
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FLUID MECHANICS TUTORIAL No. 3 BOUNDARY LAYER THEORY
1 FLUID MECHANICS TUTORIAL No. 3 BOUNDARY LAYER THEORY In order to complete this TUTORIAL you should already have completed TUTORIAL 1 and 2 in this series. This TUTORIAL examines BOUNDARY LAYER THEORY in some depth. When you have completed this TUTORIAL , you should be able to do the following. Discuss the drag on bluff objects including long cylinders and spheres. Explain skin drag and form drag . Discuss the formation of wakes. Explain the concept of momentum thickness and displacement thickness. Solve problems involving laminar and turbulent BOUNDARY layers. Throughout there are worked examples, assignments and typical exam questions. You should complete each assignment in order so that you progress from one level of knowledge to another. Let us start by examining how drag is created on objects.
1. DRAG When a fluid flows around the outside of a body, it produces a force that tends to drag the body in the direction of the flow. The drag acting on a moving object such as a ship or an aeroplane must be overcome by the propulsion system. Drag takes two forms, skin friction drag and form drag. 1.1 SKIN FRICTION DRAG
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