The Laboratory of Research in Fluid Dynamics and Combustion Technologies (LIFTEC by its Spanish acronym) is a joint center between the Spanish Scientific Research Council (CSIC) and University of Zaragoza.
The research activities at LIFTEC are dedicated to the study of various phenomena related to Fluid Dynamics, with special attention to environmental problems, including experimental, computational and theoretical techniques.
The main lines of research are:
Stochastic methods and Monte Carlo numerical techniques are used to estimate the evolution of velocities, temperatures and mean concentrations in flow with and without chemical reactions, and of dispersion parameters (variance and higher order moments). Predictions are compared with experimental data and with results obtained using direct numerical simulation. New techniques have been developed and implemented to solve this type of flows.
Currently, these methods are combined with Large Eddy Simulation (LES) to obtain a more accurate description of the flow evolution.
Pseudo-spectral methods are used to numerically solve the velocity field and inert or reactive scalars in homogeneous, isotropic turbulence. The obtained results are used as experimental data to model and calculate turbulent reacting flows. Results are also used to study the velocity and scalar topological behavior.
Development of stabilized finite element methods to calculate incompressible and compressible flows, both laminar and turbulent. The methods are also extended to free surface flows.
Artificial neural networks are applied to the analysis, reduction and representation of complex thermo-chemical systems.
Experiments are combined with numerical simulations of the bubble dynamics, temperature fields and chemical species concentrations when subjected to the very high temperatures and pressures typical in the bubble collapse process. The final objective is to be able to apply hydrodynamic cavitation to treat sewage and other wastewaters.
Experiments are performed in axisymmetric jets with particles/droplets dragged by air to characterize and control the different phenomena responsible for dispersion and mixing of the particles in the flow. Research includes measurement of mean values, variance and correlations of the velocity components for both phases, simultaneous determination of velocity and particle size, and computation of local mass flow rates. Measurements are obtained with a phase-Doppler anemometer (PDA), particle image velocimetry (PIV), and flow visualization. Free, forced and swirling jets have been analyzed.
Improvement and adaptation of velocimetry and dynamic granulometry techniques to be used in multiphase flows. Some of these developments include:
Experiments are performed to study basic atomization phenomena, including pressure, gas-assisted, or other alternative methods (for example ultrasonic atomization). Both planar liquid sheets and axisymmetric configurations have been considered. Influence of different parameters (pressure, flow rate, viscosity, surface tension) has been analyzed. Linear instability analysis considering liquid and gas viscosities have been completed.
Characterization of atomizing nozzles, either commercial or designed in LITEC, analyzing parameters such as pressure and flow rate, droplet mean diameter and droplet size distribution, spray angle, droplet velocity and spray structure. Nozzle design for specific purposes, for example for high viscosity liquids, or for microscopic droplet generation.
