Hydrodynamic (fluid flow) problems in general are actual from the wide points of view. The ecological catastrophe in the Czech Republic (2002), especially flooding of Pilsen, gives us new impulses for numerical simulation of particular fluid flow problems. Here we discuss two variants of...

The Mahanadi River is one of the largest river systems in the east coast of Indiaand the estuary drains and communicates with the Bay of Bengal. The seasonallyvarying fresh water river discharge and the intrusion of salt water from the baydepend on the flow associated with the semi-diurnal...

This paper employs a two-dimensional variable density flow and transport model to investigate the transport of a dense contaminant plume in an unconfined coastal aquifer. Experimental results are also presented to show the contaminant plume in a freshwater–seawater flow system. Both the...

Since 1970 several aerodynamic prediction models have been formulated for the Darrieus turbine. We can identify two families of models: stream-tube and vortex. The former needs much less computation time but the latter is more accurate. The purpose of this paper is to show a new option for...

Nonlinear effects in the two-component medium with conductivities σ1 (metal) and σ2 (insulator) near the percolations threshold is studied. For the medium having cubic nonlinearity an effective nonlinear conductivity ae and correlation functions of the electrical field 〈e4〉 and current...

The seismic ground motion of a test area in the eastern district of Naples is computed with a hybrid technique based on the mode summation and the finite difference methods. This technique allows us the realistic modelling of source and propagation effects, including local soil conditions. In...

The wind power as a large alternative energy source appear in Uruguay. A nested method to obtain the mean wind velocity time series at complex terrain sites and describe the turbulence was developed. Sites with mean velocity over 9m/s and capcity factor over 40% were found. The aerodynamic...