In order to enrich the modelling of uid ows, we investigate in this paper a coupling between two models dedicated to distinct regimes. More precisely, we focus on the in uence of the Mach number as the low Mach case is known to induce theoretical and numerical issues in a compressible framework. A moving interface is introduced to separate a compressible model (Euler with source term) and its l...

Through a linear analysis, we show how to modify Godunov type schemes applied to the compressible Euler system to make them accurate at any Mach number. This allows to propose all Mach Godunov type schemes. A linear stability result is proposed and a formal asymptotic analysis justifies the construction in the barotropic case when the Godunov type scheme is a Roe scheme. We also underline that ...

Mach-Number Measurement with Laser and Pressure Probes in Humid Supersonic Flow G. C. Herring NASA Langley Research Center, M/S 493 Hampton, VA 23681-2199 Abstract Mach-number measurements using a nonintrusive optical technique, laser-induced thermal acoustics (LITA), are compared to pressure probes in humid supersonic airflow. The two techniques agree well in dry flow (-35 °C dew point), but L...

Mach cones composed of shear waves were observed experimentally in a two-dimensional screened-Coulomb crystal. Highly charged microspheres suspended in a plasma and interacting with a repulsive Yukawa potential arranged themselves in a triangular lattice with hexagonal symmetry. Mach cones were excited by applying a force from the radiation pressure of a moving laser beam. They had a single-con...

The Mach 3.0 I/O system represents a radical departure from its predecessor { Mach 2.5, which relied on the BSD Unix model of device management. The I/O interface in Mach 3.0 supports device drivers that are largely device-independent, implemented at user-level, and location-independent. Our approach to device management signiicantly reduces the size of the kernel's machine-dependent code, enab...

1Dipartimento di Bioscienze e Territorio, Università del Molise, Pesche, Italy; [email protected] 2Laboratorio di Xilogenesi, Istituto per la Valorizzazione Legno e delle Specie Arboree (IVALSA), Consiglio Nazionale delle Ricerche, Sesto Fiorentino, Italy 3Dipartimento di Bioscienze e Territorio, Università del Molise; The EFI Project Centre on Mountain Forests (MOUNTFOR), Edmund Mach F...

A spatially non-dissipative, implicit numerical method to simulate turbulent reacting flows over a range of Mach numbers, is described. The compressible Navier–Stokes equations are rescaled so that the zero Mach number equations are discretely recovered in the limit of zero Mach number. The dependent variables are co-located in space, and thermodynamic variables are staggered from velocity in t...