1. Fluid Mechanics –For Civil Engineers is all about SMU Storing– Moving– Using ( Incompressible fluids - water) To design and manage these systems we need to know We need to know The STATE of the Fluid--- Usually for CE PRESSURE p and VELOCITY v The interaction of the fluid with its surroundings (Forces) Most problems in CE 3502 will involve finding --- a pressure, a velocity, or a force (energy-work-power) We use 3 sets of tools to determine the State and Forces

2. 2. Understanding Forces in Fluids Surface tension Pressure force drag surface resistance Viscosity Density Specific Weight 1. Knowing Fluid Properties Response to shear stress

3. 3. Using Conservation Equations (Mass- Energy-Momentum) What is resistance force ? Conservation of Mass (Volume) Q -- volume flow rate Sum of Qins = sum of Qouts Red=control volume Conservation of Energy (Bernoulli—If losses are neglected) Net External Force = rate of change of momentum Conservation of Momentum Newton's 2 nd Law Review Dynamics -Statics Review vector calculus u(x,t) n Arbitrary fixed porous volume in Steady flow field u Net flow out of volume = = 0 Where are we