Ram-Air Parachute Simulation with Panel Methods and Staggered Coupling

Simulation of Ram-Air Parachute Systems with the Panel Method and Staggered Fluid-Structure Coupling

Comments on staggered fermions / Panel discussion

The rooting procedure commonly used with staggered fermions does not correctly treat nonperturbative effects associated with gauge field topology. In practice these effects are small for the physics of flavor non-singlet particles. However large uncontrolled systematic errors are expected for flavor singlet issues, such as the mass of the eta prime meson. While the relative speed of the algorit...

Water hammer simulation by explicit central finite difference methods in staggered grids

Four explicit finite difference schemes, including Lax-Friedrichs, Nessyahu-Tadmor, Lax-Wendroff and Lax-Wendroff with a nonlinear filter are applied to solve water hammer equations. The schemes solve the equations in a reservoir-pipe-valve with an instantaneous and gradual closure of the valve boundary. The computational results are compared with those of the method of characteristics (MOC), a...

The SF running coupling with four flavours of staggered quarks

In order to study the running coupling in four-flavour QCD, we review the set-up of the Schrödinger functional (SF) with staggered quarks. Staggered quarks require lattices which, in the usual counting, have even spatial lattice extent L/a while the time extent T/a must be odd. Setting T = L is therefore only possible up to O(a), which introduces different cutoff effects already in the pure gau...

The Schrödinger functional running coupling with staggered fermions

We discuss the Schrödinger functional in lattice QCD with staggered fermions including its order O(a) boundary counterterms. We relate it, in the classical continuum limit, to the Schrödinger functional as obtained in the same limit with Wilson fermions. We compute the strong coupling constant defined via the Schrödinger functional with staggered fermions at one loop and show that it agrees wit...