Category: Case Studies

High Speed Flows and Slow Speed Solutions – An Introduction to Under-Expanded Jets Modelling Challenges

Introduction Fluid jets are found in many engineering applications including rocket nozzles and cooling devices, but may also arise due to accidental leaks. When the fluid is a gas, relatively low pressures are required for the jet to reach the speed of sound (Mach 1) at the exit of the nozzle. As such, it’s important […]

Virtual Tracer Tests Using CFD

Physical Tracer Testing A "tracer test" describes a general testing procedure wherein a passively transported substance (such as a dye or chemical) is used to probe the hydraulic characteristics of wastewater reactors. Many regulatory agencies request that tracer tests be done on contact basins to validate their hydraulic performance and ensure that adequate disinfection is […]