Question

A function u is a “subsolution” named for this quantity at point x if, for any smooth function, phi, such that u minus phi is locally maximized at x, a PDE is non-positive on a combination of u and phi. Crandall and Lions introduced that type of generalized PDE solution named for this quantity in reference to a method of solving the Hamilton–Jacobi equations named for the “vanishing” of this quantity. A form of this quantity that equals another form of this quantity plus two-thirds times a third form of this quantity is assumed to equal zero in the (*) Stokes hypothesis. In a linear stress constitutive relation derived from the Cauchy momentum equation, two forms of this quantity each multiply a function of the velocity to give the deviatoric stress tensor. When this quantity is zero, the Navier–Stokes equations reduce to the Euler (10[3])equations. (10[3]-5[1])For 10 points, name this quantity that is zero for a superfluid. ■END■ (10[4])

ANSWER: viscosity [accept viscosity solution, method of vanishing viscosity, volume viscosity, bulk viscosity, kinematic viscosity, shear viscosity coefficient, or second viscosity coefficient] (The Stokes hypothesis is the assumption that bulk viscosity, which equals the shear viscosity coefficient plus two-thirds times the second viscosity coefficient, equals zero.)
<Tim Morrison, Physics>
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Summary

2023 Chicago Open08/05/2023Y10100%0%10%147.90

Buzzes

PlayerTeamOpponentBuzz PositionValue
Kevin WangI would prefer not toIn Search of Things Past14210
Raul PassementRomanos IV Diogenes’ Macaroni GrillCurse you, Periplus the Platypus!14210
Mike SoriceTeam Name Think DetailSaint Peter Andre 300014210
Billy BusseBHSUThe Plague (anime)" was redirected to: "Oran High School Host Club14310
Iain CarpenterDon't be Afraid, the Clown's Afraid TooHang et al., Robert Browning14310
Adam FineThe Catastrophic Implosion of Packet SubThe anti-STOON-dahl cabal (the tall Keyal et al.)14310
Rein OtsasonThe Canadianswave2: trimming membership codes 9655377758gp143-5
Connor BlakeI prefer really not to speak. If I speak I’m in big troubleEvans Hall destruction awaiters15610
Conor Thompson[moderator voice] yes that is so tenpointscore! is your team feeling bonuspilled?Quasicrystal Silence15610
Chris RayTeach Us to Outgrow Our Ladnessremembrance of lost time15610
Eric Bobrowwave2: trimming membership codes 9655377758gpThe Canadians15610