Airfoil is not available for Linux but there are a few alternatives that runs on Linux with similar functionality. The most popular Linux alternative is SoundWire, which is free. If that doesn't work for you, our users have ranked 14 alternatives to Airfoil, but unfortunately only two of them are available for Linux.
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This is a major mistake. The behavior of 3D wings is fundamentallydifferent than the behavior of 2D airfoils. Going from 2D to 3D is not a trivial change.
In our 3D world, airplanes behave like hovering helicopters, producing a downwards-moving plume of air. When flying horizontally, the plume of air becomes a downstream wake which carries away downwards momentum, and constitutes a net downwash. The wing injects downwards momentum into local air parcels, and this air keeps moving downward long after the aircraft has departed.
We encounter this as a wide, descending air mass commonly labeled 'tip-vorticies.'
But in the 2D world of the wind-tunnel, there is no such downward-moving wake behind the wing. Instead, the 2D upwash must always be exactly equal to the 2D downwash, and the wing does not push upon the air. Instead, all the momentum is injected directly and instantly into the distant floor/ceiling. Even more important, 3D wings have finite dimensions, while 2D wings act as if they have infinite span. An infinite wingspan gives some exceeding strange results; odd results never produced by finite 3D wings in the real world.
For example, if a 2D infinitely-wide wing should ever deflect even a tiny portion of the oncoming air downwards (deflecting a streamline,) it would deflect an infinite amount of air, and produce an infinite lifting force. As a result, a 2D infinite airfoil does an odd thing: it applies a finite force to an infinite mass of air. In response, a net amount of air does NOT move downwards (since it has infinite mass.) The incoming and outgoing streamlines remain horizontal. The wing doesn't deflect any air at all, on average. The wing acts like a weird reaction engine, a strange engine where the 'exhaust gasses' have zero velocity and infinite mass. This strange effect only applies to 2D airfoils and to infinitely-wide wings, and obviously is never encountered with real 3D airplanes flying through 3D air.
In other words, flight of airplanes in the real world is an example of reaction engines and propulsion, same as with hovering helicopters and hovering rocket engines. Real wings are reaction engines. But the flight of a 2D airfoil is not propulsion, and doesn't inherently require any fuel. Real 3D airplanes require fuel, even when flying in an idealized zero-friction environment. (Real helicopters and rocket engines are the same. But a rocket engine with an infinitely-wide engine-bell does not need fuel and is not a reaction engine. The same is true of a helicopter with infinitely-wide rotor blades ..and true for a two-dimensional airfoil in a world of 2D streamlines.)
I attempt to explain the problem in words, but words are easilymisunderstood (especially on hot-button issues where emotions run high.) A visual analogy works much better. Below is my explanation for how athree-dimensional airplane flies through 3D air. It is very differentthan the typical 2D explanations found in most textboooks. My'circulation' is flipped ninety degrees!
Take a look at my animated crude GIF diagram, and also see the green smoke laser-scanned video segment of a model 747 producing a downwash pattern.