Fluid mechanics is the branch of physics concerned with balance and movement of fluids and fluid systems under the influence of external and internal forces. The fundamental difference between the rigid body and the fluid is the mobility of the molecules. Rigid body moves as a set of mass points of a given shape, the fluid does not have its own shape and, contrary to the rigid body under the action of forces irreversibly deforms, its particles are brought into motion, and flow in current bounded by solid walls or interface (level).  The goal of fluid mechanics is to explain phenomena and processes occurring in fluids and fluid systems using physical laws and predicting the behavior of fluids and fluid systems in certain conditions, to determine the distribution of fluid properties, i.e. pressure, density, velocity, temperature, concentration, etc. and possibly changes in these variables over time in different locations within the liquid.  

Research of two- and multi- phase systems flow, including the movement of solid particles in a fluid is the theoretical basis of many engineering disciplines. The study of fluid and fluid systems mechanics at the Institute of Hydrodynamics ASCR , v. v. i., is focused on theoretical and experimental investigation of the flow of suspension, the movement of particles and sediment in close and open conduits, tanks and reservoirs, mixing processes of fluid systems, as well as on mathematical modelling and numerical simulation, calibration and verification of flow models based on the results of experimental research, on experimental methods, and on analysis of a turbulent flow.

With the development of new techniques and technologies are increasing the possibility of experimental research on a range of non-invasive methods and methods for understanding the structure of current and local values , especially vector velocity and density. Experimental methods, similarly like numerical methods have developed in a separate area of knowledge and it is necessary to pay them adequate attention.

Selected papers

Chára, Z.; Kysela, B.; Konfršt, J.; Fořt, I., 2016. Study of fluid flow in baffled vessels stirred by a Rushton standard impeller. Applied Mathematics and Computation, 272(3), 614-628.

Skalák, Z., 2016. A regularity criterion for the Navier-Stokes equations based on the gradient of one velocity component. Journal of Mathematical Analysis and Applications, 437(1), 474-484.

Kolář V., Šístek J., 2015. Corotational and compressibility aspects leading to a modification of the vortex-identification Q-criterion, AIAA Journal 53, 2406-2410.

Ben-Nun, R.; Sheintuch, M.; Kysela, B.; Konfršt, J.; Fořt, I., 2015. Semi-analytical characterization of turbulence from radial impellers, with experimental and numerical validation. AIChE Journal, 61(4), 1413-1426.

Kharlamova I.S., Vlasák P., 2015. Dependence of saltation characteristics on bed organisation in numerical simulation, Geosciences Journal, Vol. 19, No. 1, pp.177-18.

Vlasák, P., Kysela, B., Chára, Z., 2014. Fully stratified particle-laden flow in horizontal circular pipe, Particulate Science and Technology, 32(2), 179-185.

Vlasák, P.; Chára, Z.; Krupička, J.; Konfršt, J., 2014. Experimental investigation of coarse particles-water mixture flow in horizontal and inclined pipes. Journal of Hydrology and Hydromechanics, 62 (3), 241-247.

Matoušek, V.; Krupička, J., 2014. One-dimensional modeling of concentration distribution in pipe flow of combined-load slurry. Powder Technology, 260, 42-51.

Matoušek, V.; Krupička, J.; Pěník, V., 2014. Distribution of medium-to-coarse glass beads in slurry pipe flow: evaluation of measured concentration profiles. Particulate Science and Technology, 32 (2), 186-196.

Šebestíková, L., 2013. Relation between shape of liquid-gas interface and evolution of buoyantly unstable three-dimensional chemical fronts. Physical Review E, 88 (3). 033023.