Two-phase flows are frequently modelled and simulated using the Two-Fluid Model (TFM) Drift Flux (DFM). This paper proposes Stokes–Dirac structures with respect to which port-Hamiltonian representations for such two-phase flow models can be obtained. We introduce a non-quadratic candidate Hamiltonian function present dissipative both models. then use structure of corresponding formally skew-adj...

We present a systematic study of capillary filling for multi-phase flows by using mesoscopic lattice Boltzmann models describing a diffusive interface moving at a given contact angle with respect to the walls. We compare the numerical results at changing the density ratio between liquid and gas phases, δρ/ρ and the ratio, δξ/H , between the typical size of the capillary, H , and the interface w...

Though discrete particle simulation (DPS) has been widely used for investigating gas-solid flows from a more detailed level as compared to traditional two-fluid models (TFM), it is still seriously limited by the computational cost when large scale systems are simulated. GPUs (graphic processing units), with their massive parallel architecture and high floating point performance, provide new pos...

lent Reacting Multi-Phase Flows," 4th International Symposium on Transport Phenomena in Heat and Mass Transfer (Sydney, Australia), Vol. 1, 1991, pp. 391-401. Chan, S. H., and Tan, C. C., "Complex Equilibrium Calculation by Simplex and Duality Theories with Applications to Liquid Metal Fuel Propulsion Systems," Combustion and Flame, Vol. 88, Feb. 1992, pp. 123-136. Parnell, L. A., Gilchrist, J....

We introduce a new thermodynamically consistent diffuse interface model of Allen–Cahn/Navier–Stokes type for multi-component flows with phase transitions and chemical reactions. For the introduced diffuse interface model, we investigate physically admissible sharp interface limits by matched asymptotic techniques. We consider two scaling regimes, i.e. a non-dissipative and a dissipative regime,...

We study the formation of disks via the cooling flow of gas within galactic haloes using smoothed particle hydrodynamics simulations. These simulations resolve mass scales of a few thousand solar masses in the gas component for the first time. Thermal instabilities result in the formation of numerous warm clouds that are pressure confined by the hot ambient halo gas. The clouds fall slowly onto...

A mass-conserving Level-Set method to model bubbly ows is presented. The method can handle high density-ratio ows with complex interface topologies, such as ows with simultaneous occurrence of bubbles and droplets. Aspects taken into account are: a sharp front (density changes abruptly), arbitrarily shaped interfaces, surface tension, buoyancy and coalescence of droplets=bubbles. Attention is p...

We discuss the role that magnetic fields in low luminosity accretion flows can play in creating and maintaining a multi–phase medium, and show that small magnetically– confined clouds or filaments of dense cold gas can dramatically reprocess the ‘primary’ radiation from tori. In particular, radio emission would be suppressed by free–free absorption, and an extra (weak) component would appear at...

Modern technologies offer new opportunities for experimentalists in a variety of research areas of fluid dynamics. Improvements are now possible in the state-of-the-art in precision, dynamic range, reproducibility, motion-control accuracy, data-acquisition rate and information capacity. These improvements are required for understanding complex turbulent flows under realistic conditions, and for...