Below are the Things You Should Know Questions for 2009

The main focus of each page should be the primary question. As part of answering this, be sure that you also address the subquestions.

Note: Students with access to the ASDL network must use the internal ASDL wiki to edit their pages.

  Topic Student Question Subquestions
1Ideal GasJade CheongWhat is an ideal gas?What causes a gas to be non-ideal? Can a viscous gas be modeled as an ideal gas? Why is modeling a gas as ideal useful?
2Speed of SoundAnshuo LiuIn a general sense, what is the speed of sound?How do we calculate it? Provide an example from fundamental fluid properties. How is it related to compressibility?
3First Law of ThermodynamicsRobert TaylorWhat is the first law of thermodynamics? What are all three possible ways to transfer energy? Scientifically (not grammatically) does it make sense to say an object "does heat" or "does work"? Why? Does it make sense to say an object "has heat" or "has work"? Why?
4Internal EnergyJames KooimanWhat is internal energy?On a molecular scale, what types of energy contribute to internal energy? What types of problems are more easily solve with internal energy instead of enthaply?
5Second Law of ThermodynamicsJohanna CeiselWhat is the second law of thermodynamics?Give two classic statements of the second law. Give an example of a process that is impossible because of the second law. (Note, you don't need to provide a thorough definition of entropy for this question).
6EntropyEriks OsvaldsWhat is entropy (as it relates to thermodynamics)? Explain how it relates to the second law of thermodynamics. As an example, explain (qualitatively) how entropy and enthalpy change in the following situations: 1) A gallon of boiling water is poured in an equal mass of cold water. 2) A gallon of boiling water is poured into a lake. Compare the units of entropy to the units of enthalpy.
7EnthalpyTrevor LaughlinWhat is enthalpy?What types of problems are more easily solved with enthalpy instead of internal energy?
8WorkJohn BennewitzWhat is work?Explain the difference between reversible and irreversible processes. How is it measured?
9PowerLisa StuberWhat is power?Explain how power can be calculated for mechanical, fluid, electric, and chemical systems (in every case, it is a product of two quantities).
10PressureAlex MaagWhat is pressure?What is hydrostatic pressure? What is dynamic pressure? Present a sample problem to calculate each.
11FluidSangin ParkWhat is a fluid?How are fluids different from solids? What is a non-Newtonian fluid?
12VorticityRobbie GillWhat is vorticity?Why is vorticity important? How is it different than circulation?
13ViscosityPhilippe RanqueWhat is viscosity?On a molecular level, what causes a gas to be viscous? How does it change with other variables? How do we measure viscosity?
14Continuity EquationBrandon BellWhat is the continuity equation (as it relates to fluid mechanics)?Discuss 2- and 3-dimensional and compressible and incompressible cases.
15Reynolds NumberWill RungeWhat is the Reynolds number?Why is it important? Explain how Reynolds number relates to laminar and turbulent flows for internal and external flows. Explain what reference length should be used for flow around different objects. (Ex, pipes, airfoils, cylinders, rockets)
16Stream FunctionJeffrey JeffreyWhat is a stream function?What are streamlines? When are they used?
17Potential FlowLuis VidalWhat is a potential flow?Give examples of flows relevant to aerospace engineering that can and cannot be modeled as potential flows. Can potential flow be used to predict drag of an airfoil? Explain.
18Irrotational FlowMark NelsonWhat is irrotational flow?Is it possible to have an irrotational vortex? Why? How is it used to solve problems?
19Divergence TheoremJeff MoffettWhat is the divergence theorem?Explain how it is relevant to aerospace engineering.
20Incompressible FlowJason CormanWhat is incompressible flow?What is Euler's equation? What is Bernoulli's equation? Give several examples of flows relevant to aerospace engineering that can be modeled as incompressible flows.
21Navier-Stokes EquationsEberhard BoemckeWhat are the Navier-Stokes Equations?When is it appropriate and feasible to use them?
22Friction CoefficientThomas CarrollWhat is the friction coefficient?Is it larger for a turbulent boundary layer or for a laminar boundary layer? Why? How can we relate the friction coefficient for the two conditions?
23Boundary LayerJesse KallmanWhat is a boundary layer?What are some different ways to define boundary layer thickness? What is a thermal boundary layer? What is the Blasius Profile?
24DragJean-Baptiste MercierWhat is drag?What are the common sources and types of drag? What direction does the drag force point(provide a useful diagram)?
25LiftLudo HivinWhat is lift?Explain lift in terms of a pressure differential and conservation of momentum. Are the two theories compatible? What direction does the lifting force point(provide a useful diagram)?
26Momentum EquationSiva HarikumarWhat is the Momentum Equation?Explain, in words, how it is derived. When is it appropriate to use it?
27Thin Airfoil TheoryMark WeilandWhat is thin airfoil theory?What does it say about the lift curve slope? What does it say about drag? When can thin airfoil theory be used?
28Center of PressurePavan RaghuramWhat is the center of pressure of an airfoil?Where is it located in low-speed flow? In high-speed flow? How does it depend on airfoil geometry? What is the difference between the center of pressure and the aerodynamic center?
29Compressible FlowWiliam BowdenWhat is compressible flow?Under what conditions do we consider a flow to be compressible? What makes compressible flows more challenging to solve than incompressible flows?
30ShockMichael JonesWhat is a shock?What is a normal shock? What is an oblique shock? What are the normal shock relations. Is flow across a shock adiabatic? Isentropic? What are shock relations?
31Prandtl-Meyer ExpansionPhilip SondervanWhat is a Prandtl-Meyer Expansion?How do the flow properties change from before to after the expansion? What is the Mach angle?
32Critical Mach NumberGautham VoletiWhat is the critical Mach number?How do you calculate it? What parameters determine the critical Mach number for a 2-D infinite body and for a 3-D body? How do they effect the critical Mach number?
33Elliptic LoadingBrandon SforzoWhat is "elliptic loading" on a wing?Why is this desirable? How can it be achieved with a non-elliptical wing?
34Payload Range DiagramMike MuellerWhat is a payload-range diagram?How is it created? When is it useful?
35Breguet Range EquationAlex DessantiWhat are the Breguet range and endurance equations?Explain, in words, how to derive them. When are they appropriate to use?
36Angle of AttackJonathan HeraultWhat is the angle of attack of an aircraft?What are the induced and effective angles of attack? Why are these important to know? What is the difference between pitch angle and angle of attack? Can the pilot choose it, or does it "fall out" as a result of some equilibrium?
37StallJohn RobinsonWhat is stall?What are some types of stall? How can it be mitigated?
38Aircraft EnginesSridevi PogaruWhat are typical types of aircraft engines used?Under what flight conditions and missions is each type preferred?
39Thrust EquationJon GladinWhat is the "thrust equation"?How does it change for rockets? What is propulsive efficiency?
40FatigueBen HavrileskoWhat is fatigue?Do all materials fatigue in the same way? Why? What is the fatigue limit? How is it considered in the design process? What is an S-N diagram?
41V-n DiagramTom AhernWhat is a V-n Diagram?Show an example and explain all important features and points.
42Stress and StrainFaisal AhmedWhat are stress and strain?What are the different types? How do we measure them?
43Aircraft StabilityFelipe OrtegaHow do we describe aircraft stabilty?What are typical stability modes?
44Reference FrameHaoyun FuWhat are typical frames of reference for Aerospace?How do they relate to each other? When is each type used? How does their relation help us understand Coriolis force?
45Wind TunnelWilliam RevellWhat is a wind tunnel?How do they work? What are some common types?
46AirfoilChris ArgoteWhat is an airfoil?What are common types, naming schemes, characteristics (such as camber and thickness) and methods for varying them?
47Converging-Diverging NozzleSheldon SmithWhat is a converging-diverging nozzle?What does it mean to be overexpanded or underexpanded? How do different flows change as they go through the nozzle?
48Aspect RatioPhilipp WitteWhat is the Aspect Ratio of a wing?How do we calculate it for irregular wing planforms? What is the effect of changin aspect ratio on common aerodynamic parameters? Why?
49Pitot TubeTim CarrWhat is a Pitot tube?Present an example problem that calculates stagnation pressure at the probe tip given a flow speed, static temperature, and static pressure appropriate for an aircraft in cruise. What is the difference between a Pitot tube and a Pitot static tube?
50Aerodynamic CoefficientTrey KaslingWhat are the common aerodynamic coefficients?How are they calculated? Why do we use them?
51Buckingham-Pi TheoremMarc MugnierWhat is the Buckingham Pi Theorem?When is it useful? Give an example.
52Atmospheric PropertiesAngie LoweDescribe how pressure, temperature, and density vary with altitude.Explain why each variation occurs. Why does temperature decrease as you go up, even though you're getting closer to the sun? Why does it eventually stop decreasing? What is the lapse rate?