Heated transitional supersonic jets exhausting from a rectangular nozzle at over-expanded conditions are investigated by Large Eddy Simulations and Ffowcs-Williams Hawkings acoustic analogy. Four cases with fixed pressure ratio but different temperature ratios (TR) of 1.0, 2.0, 4.0, 7.0 analyzed. Numerical results show that the increasing jet velocity significantly increases, whereas its Reynol...

Electromagnetic Levitation in reduced gravity has demonstrated great utility the measurement of thermophysical properties and study solidification metallic melts. Internal flow liquid metal samples is a critical parameter many these experiments. For example, turbulent sample prevents viscosity by oscillating droplet method, as measured damping oscillations property not fluid. In solidification,...

It has been reported that a fully localized turbulent band in channel flow becomes sustained when the Reynolds number is above threshold. Here we show evidences bands are of transient nature instead. When length controlled to be fixed, lifetimes appear stochastic and exponentially distributed, sign memoryless nature. Besides increasing with number, mean lifetime also strongly increases length. ...

Airflow occurring in a ventilation duct is characterized by low velocity and hence Reynolds number. In these conditions, either laminar, transitional or turbulent flow will occur. Different conditions result different values of the friction coefficient. To achieve numerical simulation, modified algebraic model for bypass transition (modified k−ω) was used. Numerical simulation validated using P...