What is meant by Mach reflection?

[′mäk ri‚flek·shən] (fluid mechanics) The reflection of a shock wave from a rigid wall in which the shock strength of the reflected wave and the angle of reflection both have the smaller of the two values which are theoretically possible.

What is the Mach stem effect?

If the explosion occurs above the ground, when the expanding blast wave strikes the surface of the earth, it is reflected off the ground to form a second shock wave traveling behind the first. The reflected blast wave merges with the incident shock wave to form a single wave, known as the Mach Stem. …

What is double Mach reflection?

The double Mach reflection (DMR) problem is an important test case for the assessment of the resolution of Euler codes. The initial and boundary conditions specified in the conventional setup of the problem result in the formation of undesirable numerical artefacts which interfere with the solution.

What is a reflected shock wave?

When an object moves faster than the speed of sound, and there is an abrupt decrease in the flow area, shock waves are generated. The shock wave then strikes a solid wall and reflects from the wall generating a new shock. The flow downstream of the reflected shock is denoted as zone “2”.

What kind of flow does Mach reflection occur in?

Mach reflection is a supersonic fluid dynamics effect, named for Ernst Mach, and is a shock wave reflection pattern involving three shocks. Mach reflection can exist in steady, pseudo-steady and unsteady flows.

Who is Ernst Mach and what is Mach reflection?

Mach reflection. Mach reflection is a supersonic fluid dynamics effect, named for Ernst Mach, and is a shock wave reflection pattern involving three shocks.

What are the three shocks in Mach reflection?

Mach reflection consists of three shocks, namely the incident shock, the reflected shock and a Mach stem, as well as a slip plane. The point where the three shocks meet is known as the ‘triple point’ in two dimensions, or a shock-shock in three dimensions.

What is the interaction point P in Mach reflection?

In Mach Reflection, the interaction point P (defined as the point where the reflected and the incident shocks meet) is detached, and a secondary shock called Mach stem connects P to the ramp. Since the Rankine–Hugoniot relations are the same as in the steady case, a pure three-shocks pattern is not possible ( Theorem 2.3 ).