Recent content by rcgldr

X86 instruction set is a moving target. As suggested by others, start off with what a C compiler generates. Advanced stuff like AVX512 + GFNI (Galios Field New Instructions) isn't something most programmers will ever get involved with.

I started programming in 1968, using punched cards. There were several batch editors for text files stored on a disk drive at the companies I worked for. The first well known text editor I used for programming was WordStar, which was popular for CP/M programmers...

Getting back on topic, in the case of a static Venturi, as the tube diameter decreases, pressure energy decreases while kinetic energy increases. In a real world situation, the total energy decreases due to losses, but kinetic energy can be increased. Indy and Formula 1 race cars use Venturi...

I agree. I'm waiting to see if someone wants to move all the glider related posts to another thread. If they just want to delete them, I wouldn't have an issue with that either, but don't know about the others involved. I did go through and did strike-through on my prior posts.

I'm still wondering about the horizontal component, especially if you consider the earth's surface to be frictionless, in which case, there could be a continuous change in the horizontal component of air velocity until the glider lands. If the earth's surface is not frictionless, then a...

I agree with this, if someone is willing to take the time to do this. I wouldn't mind a restart on the earth glider system, especially for a glider based frame of reference versus gravitational potential energy. I'm also thinking that the best example of Bernoulli at the molecular level would...

You're correct. I deleted that post (brain fade on my part). I don't recall where I got those images from. There would be a decrease in energy: Δ v would be angled more forwards, and | v + Δ v | < | v | (using | ... | for magnitude). Getting back to the glider in a steady descent, using the...

Example, XFOIL is a 2D model, XFLR5 includes 3D panel modeling. High end simulators use full 3D CFD tools.

The caveat brought up there is a time dependent force. This isn't an issue for the earth + air + glider example I've been using. For example, the gravitational potential energy between the earth and a satellite circularly orbiting the earth remains constant, even if the earth is moving with...

Again, my prior post wasn't about the tiny increase in pressure but instead the decrease in gravitational potential energy which is frame independent (this is a link) (assuming Newtonian physics), and ends up being transferred to the air as an increase in energy as the earth approaches the...

I wasn't referring to the pressure gradient versus altitude, I was referring to the decrease in gravitational potential energy as the earth gets closer to the glider (- G M m / r) (it becomes more negative), or since the distance from earth to glider is relative small versus Earth radius, a...

Just to be clear, this is in regards to 3D models of aircraft as used in some high end simulators as opposed to 2D models of airfoils?

With a longer wingspan, a greater mass of air per unit time is accelerated by a smaller amount, resulting in smaller velocity and energy changes. If there is zero energy change due to a wing, then why would a longer wing span be more efficient?

What I stated is that conservation of energy (not the amount of energy) in a closed system is frame independent. Lift and drag parameters for an airfoil can be calculated assuming no energy change (Navier Stokes, Kutta Joukowski, Euler, ...) but that doesn't mean that an energy change does not...

Consider earth, air, and glider as a closed system, and the earth as a frame of reference. Gravitational potential energy is a function of distance between earth and glider. regardless of what inertial frame of reference is used. From the glider's frame of reference, the earth is moving closer...