Recent content by boneh3ad

He... didn't use math. I am very confused by your response.

Viscous dissipation can certainly impact the flow temperature, but for an in compressible flow, it doesn't impact the kinematics. For a compressible flow, it does.

In theory, yes. In practice, there is no way to definitively predict the exact location/conditions leading to transition. It's a problem that is extremely sensitive to initial and boundary conditions. For incompressible flows, you might take a look at the Orr-Sommerfeld equation.

For an incompressible flow, kinematics and thermodynamics are decoupled. Since density is constant (i.e., no longer coupled to temperature), you can solve the velocity and pressure fields directly from continuity and momentum conservation and ignore temperature altogether. The other key is that...

I disagree with the statement that you must solve the energy equation. The nice thing about incompressible flows is that the energy equation is decoupled from the mass and momentum conservation equations, i.e., you can get forced without the energy equation. The reason the Bernoulli equation...

TL;DR Answer: You don't. Longer answer: In general, you can't just find an equation for lift coefficient, as the lift on an arbitrary object is remarkably complex based on its shape and the flow conditions. There are some shapes where you may be able to calculate it, but not many. In some...

Another timely webcomic... https://www.smbc-comics.com/comics/1707076216-20240204.png

I'd call it a hard no even if you attends a few years of school for engineering. Whether measuring it is "easy" depends on the fidelity you need. You could just drop it and measure it's terminal speed, but the error bars will be huge as it moves in all directions in the complex flow field. It...

Linear and Nonlinear Waves by Whitham Now please stop casting spurious doubt on established, extensively observed science.

Air/missile defense platforms already employ a variety of seeker options, including radar and infrared. I believe something similar to this was recently tested at WSMR. I seem to recall seeing a headline along those lines but can't seem to find it. Either way, the key is that drones come in...

Why does the article call this a first? Maybe it's a first for the UK, but it's not a first worldwide. So-called directed energy weapons, or DEWs (lasers being one example), are a hot topic right now driven largely by the cost asymmetry between traditional SAMs and small drones. The US Army...

https://en.wikipedia.org/wiki/Pascal%27s_law

I mean, his crudely-drawn hand sketch is not precise, if that's what you are asking. But any object moving through a fluid medium is going to cause that fluid to deform around it. If it's subsonic, that influence on the medium extends upstream of the object. So, sure, some of that induced flow...

I don't understand the question.

I'll repeat my position: some misconceptions are more common than others; nothing is universal (well, except death and taxes). And, to be fair, it's probably really difficult for those of us choosing to post on a physics message board to remember exactly what our intuition told us in our...