Recent content by Brian_C

The Beatles - Because

The lift comes from the difference in static pressure on the two surfaces. You can't have a "negative" absolute pressure. The gas molecules impinge on the surface and produce a force directed opposite to the unit normal vector. The first chapter of Anderson's book clarifies a lot of these points.

You can obviously have a negative "pressure drag" component at certain points along the airfoil, but that isn't the problem here. The problem is that you're confusing the concepts of gage pressure and absolute pressure. The gage pressure is negative, but you still have a "positive" pressure...

CFD is just a mathematical tool used to solve fluid problems. What's important is that you have a solid foundation of knowledge in fluid dynamics, and it sounds like you have that.

Because shear forces are ignored in the basic analysis of plane truss elements. Structural models that take into account shear stress (Timoshenko beam theory) will give results involving the shear modulus, which is a function of Poisson's ratio.

You just discovered the concept of "supply and demand". Well done.

This stuff is described in any book on gas turbine engines. Some links: https://www.amazon.com/dp/1563477793/?tag=pfamazon01-20 https://www.amazon.com/dp/1563475383/?tag=pfamazon01-20

My guess is that he's looking for some sort of tensor invariant.

They will get plenty of votes from people who either got nothing from this bill, lost their employer provided coverage, or saw their premiums skyrocket as a result. I think the Tea Party crowd actually helped the Dems pass this bill. They were able to argue that the bill represents real...

It can and will be repealed if enough people turn against it. See Prohibition.

I've encountered quite a few "engineers" who believe that theoretical knowledge is useless in the "real world". These guys should take up plumbing and leave science/engineering to the smart kids.

The liberal "FDL Action" website has written a pretty damning indictment of the health care bill. They note that this legislation will not prevent medical bankruptcies, and will impose major costs on families making as little as $66,000/year...

Obama forgot to tell the ignorant masses that his "reforms" will result in higher premiums for middle class Americans as insurance companies absorb the costs of covering millions of previously uninsured people. There is a reason that insurance companies drop people with pre-existing conditions...

I respect Al Gore for his skills as a fear monger. Well done, Mr. Vice President.

No, he was talking about any theory that purports to unify the four forces. The energy scales involved are many orders of magnitude higher than anything that could be produced in a terrestrial experiment.