Acoustic Pressure Simulation for Fluid Piping Leakages

Fluid Flow in Piping Systems

© 1989 Johnson Controls, Inc. 1 Code No. LIT-351H110 The relationship between the many factors which influence the pressure and flow rate within a hydronic system can sometimes seem very confusing. This report provides a simple systematic approach for analyzing basic hydronic systems. These concepts can later be applied to more complicated systems like those discussed in Engineering Reports H11...

Fluid Mechanics , Pumps , Piping , and Hydro Power

Narrow Band Pressure Computation for Eulerian Fluid Simulation

An Eulerian fluid simulation for incompressible fluids spends a lot of time in enforcing incompressibility by solving a large Poisson’s equation. This involves solving a large system of equations using a solver like conjugate gradients. We introduce a way of accelerating this computation by dividing the grid domain of the fluid simulation into a narrow band of high resolution grid cells near fl...

Numerical Simulation of Nonlinear Acoustic Waves in Two-Phase Fluid

Nonlinear acoustic wave propagation equation with void fraction (volume fraction of gas phase) is derived and numerically solved for the simulation of HIFU (High Intensity Focused Ultrasound) with micorbubbles in the present paper. HIFU is one of promising treatments for cancer. The focused pressure waves generate heat and necrose cancer cells. It has been lately reported that the existence of ...

Numerical Simulation of Particle Separation in the Fluid Flow in a Microchannel Including Spiral and Acoustic Regions

Particulate separation has many applications in medicine, biology and industry. In this research, the separation of polystyrene particles with a diameter of 10, 20 and 30 μm in the fluid flow of a microchannel is investigated. The microchannel consists of a spiral region and a straight region under the influence of acoustic waves. In the spiral region, the particles under hydrodynamic effects u...