At the present time, the scientific research can be divided into four groups: fluid mechanicshydrologyrheology and water treatment. Although it is not apparent, these subjects have many things in common. Brief characteristics of individual branches and research specialization of scientific teams is stated below.

Research teams

Fluid mechanics and mechanics of multiphase systems

Fluid mechanics is the branch of physics that studies behaviour of fluids at rest and in motion as a result of forces acting on fluids bodies. Its goal is to describe phenomena and processes in fluids under certain conditions by applying fundamental physical laws with as a result the determination of the distribution of fluid properties, pressure, velocity, etc. and its variation in time and space. In mechanics of multiphase system, the mixture of two or three phases replaces the fluid.


Hydrology studies the principles of water movements over the Earth. The main aim of the hydrological research is to define an occurrence of water, its circulation, spatial distribution, physical and chemical properties, and it relation to biosphere. As the water is present in all spheres of natural environment, hydrology is closely interrelated with meteorology, climatology, pedology, geology, and ecology. Water abundance, shortage, and pollution represent limiting factors for human development in various regions all over the world. Hence, the hydrological forecasting (both floods and drought) and water quality monitoring are of high importance for the human society.


Rheology is the study of the flow of matter. Rheological characteristics of materials are given by the type of applied flow and their physicochemical properties. Based on these characteristics, the materials can be divided into two groups: Newtonian (e.g. water, oil) and non-Newtonian (e.g. ketchup, blood, polymers). The rheological group at the Institute of Hydrodynamics studies Non-Newtonian liquids, mainly the polymeric materials. These materials exhibit strong nonlinear rheological properties caused by their viscous and elastic effects. The knowledge of the rheological properties of the polymeric materials plays an important role for the producers and manufacturers of the materials and also for the tool and device makers.

Water treatment

Drinking water treatment is a technological branch dealing with removal of undesirable impurities from water. The most employed method is a formation of suspension by the means of dosing and mixing coagulants and subsequent separation of formed suspension by sedimentation and/or filtration. For removal of dissolved substances in lower concentration, other processes, such as adsorption or membrane processes, can be used. The research at the Institute of Hydrodynamics is aimed at the study of mechanisms of removal of problematic substances, such as AOM (Algal Organic Matter) or micropollutants (pesticides, pharmaceuticals), and further at problems of suspension formation and properties of aggregates formed during drinking water treatment.

The Institute
of Hydrodynamics
of the CAS, v. v. i.

Pod Paťankou 30/5
166 12 Prague 6

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