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The Navier–Stokes existence and smoothness problem concerns the mathematical properties of solutions to the Navier–Stokes equations, a system of partial differential equations that describe the motion of a fluid in space. Solutions to the Navier–Stokes equations are used in many practical applications. However, theoretical understanding ...
A Riemann problem, named after Bernhard Riemann, is a specific initial value problem composed of a conservation equation together with piecewise constant initial data which has a single discontinuity in the domain of interest. The Riemann problem is very useful for the understanding of equations like Euler conservation equations because all ...
Unfortunately the pressure in region 3 can only be calculated iteratively, the right solution is found when equals u 4 = ( P 3 ′ − P 5 ) 1 − Γ ρ R ( P 3 ′ + Γ P 5 ) {\displaystyle u_{4}=\left(P_{3}'-P_{5}\right){\sqrt {\frac {1-\Gamma }{\rho _{R}(P_{3}'+\Gamma P_{5})}}}}
Wicked problem. In planning and policy, a wicked problem is a problem that is difficult or impossible to solve because of incomplete, contradictory, and changing requirements that are often difficult to recognize. It refers to an idea or problem that cannot be fixed, where there is no single solution to the problem; and "wicked" denotes ...
Ethanol fuel mixtures have "E" numbers which describe the percentage of ethanol fuel in the mixture by volume, for example, E85 is 85% anhydrous ethanol and 15% gasoline. Low-ethanol blends are typically from E5 to E25, although internationally the most common use of the term refers to the E10 blend. Blends of E10 or less are used in more than ...
That order was in response to a midair blowout of a fuselage section that detached from an Alaska Airlines 737 Max 9 jet in January. FAA administrator Michael Whitaker held a press briefing ...