Aeroacoustics of volcanic jets: Acoustic power estimation and jet velocity dependence

Laboratory Studies of Volcanic Jets

The study of the fluid dynamics of violent volcanic eruptions by laboratory experiment is described, and the important fluid-dynamic processes that can be examined in laboratory models are discussed in detail. In prelim•inary experiments, pure gases are erupted from small reservoirs. The gases used are Freon 12 and Freon 22, two gases of high molecular weight and high density that are good anal...

A numerical model for volcanic jets

Introduction Conclusions References

Deflection of jets induced by jet-cloud & jet-galaxy interactions

The model first introduced by Raga & Cantó (1996) in which astrophysical jets are deflected on passing through an isothermal high density region is generalised by taking into account gravitational effects on the motion of the jet as it crosses the high density cloud. The problem is also generalised for relativistic jets in which gravitational effects induced by the cloud are neglected. Two furt...

Application of Compact Schemes to Large Eddy Simulation of Turbulent Jets

We present 3-D Large Eddy Simulation (LES) results for a turbulent Mach 0.9 isothermal round jet at a Reynolds number of 100,000 (based on jet nozzle exit conditions and nozzle diameter). Our LES code is part of a Computational Aeroacoustics (CAA) methodology that couples surface integral acoustics techniques such as Kirchhoff’s method and the Ffowcs Williams-Hawkings method with LES for the fa...

Two-Dimensional Blood Flow Velocity Estimation Using Ultrasound Speckle Pattern Dependence On Scan Direction And Velocity