Stanislaw Kostecki

Wroclaw University of Science and Technology | WUT · Department of Civil Engineering

Due to extreme rainfall in 2010 in the Lusatian Neisse River catchment area (in Poland), a flood event with a return period of over 100 years occurred, leading to the failure of the Niedów dam. The earth-type dam constructed for cooling the Turów power plant was washed away, resulting in the rapid release of nearly 8.5 million m3 of water and the f...

In this chapter, the basis of three-dimensional modelling are stated together with an example of the numerical model of the water flow through a block rampage.

Due to extreme rainfall in 2010 in the Lusatian Neisse River catchment area, a flood event with a return period of over 100 years occurred, leading to the failure of the Niedów dam. The earth-type dam was washed away, resulting in the rapid release of nearly 8.5 million m3 of water and the flooding of the downstream area with substantial material l...

Due to extreme rainfalls in 2010 in the Lusatian Neisse river catchment, a flood event with a return period of over 100 years took place leading to the failure of the Niedów dam. The earth type dam was washed away with a result of a rapid release of nearly 8.5 million m3 of water volume and flooding of the downstream area with substantial material lo...

As part of the project “Research and Development Conception on the modernization of the canalized reach of the Odra River to a navigable waterway of class Va” one of the goals to enhance the navigability classification of the waterway is to propose several river training works in the Odra reach from the barrage “Koźle” up to the new hydraulic compl...

Climate change in recent years has caused considerable intensification of rainfall, and as a consequence an increase in flood waves flow rate. This article presents the verifying method of the dam overtopping risk under conditions of enlarged volumetric flood flow rates inflowing the storage reservoir. Values of the flow rate peaks were determined...

This paper presents a methodology of calculating the water transfer capacity of a dyke pumping station in flood wave conditions in order to improve its functioning, especially with regards to the safety of the areas being drained. The exemplary analysis was carried out for a pumping station situated on a small right-bank tributary of the Odra River...

Abstract: There are presented the results of numerical calculations concerning the flow of viscous fluid. The flow was tested by means of vortex method which was especially suitable for modelling the flow characterized by large Reynolds numbers. The calculations were carried out in the Lagrangian coordinates which allowed the method to be grid-free...

Measurements of turbulent open-channel flow subjected to upward seepage (injection) were performed in a rectangular laboratory flume using a two-dimensional electromagnetic velocimeter. The influence of vertical groundwater flow on open-channel hydrodynamics was analyzed. The output of these experiments demonstrates that the induced seepage affects...

The paper presents the results of Operational Modal Analysis (OMA) of a weir on Odra river in Poland. The immediate reason for the dynamic analysis was the occurrence of clearly perceivable vibration of the weir in time of the high water level and big water discharge of the Odra river. The modal analysis was performed experimentally, using OMA. The...

In this paper, two- and three-dimensional numerical modeling is applied in order to simulate water flow behavior over the new Niedów barrage in South Poland. The draining capacity of one of the flood alleviation structures (ogee weir) for exploitation and catastrophic conditions was estimated. In addition, the output of the numerical models is comp...

On 07 August 2010 a disaster occurred at the barrage Niedów located on the river Witka as a result of unprecedented rainfall in the Nysa Luzycka catchment area. The flood wave swept through the dam crest destroying almost the whole structure within a few dozen minutes. The only element that did not vanish was the concrete structure of the spillway...

A combination of the vortex method and the boundary element method is used here to predict the two-dimensional flow field around a circular cylinder. Cylindrical structures experience strong hydrodynamic loading, due to vortex detachment from the both sides of the cylinder during the flow. Thus, the practical meaning of such calculation is signific...

Computational Fluid Dynamics (CFD) is becoming more popular among water engineers due to the rapid advance of computational facilities in the recent years. The capabilities of CFD allow visualizing and analyzing complex phenomena that involved fluid motion and which cannot be easily reproduced at the laboratory in physical models. Nevertheless, man...

A very important element of a hydroelectric power is the draft tube, whose shape importantly determines the efficiency of the powerhouse and the possibility of occurrence of cavitation. In the case of cavitation within this draft tube, the surfaces that are exposed to convex sides, such as its elbow, or places where the surface curvature radius are...

A numerical method, being a combination of the vortex method and the boundary element method, is used here to predict the two-dimensional flow field in the vicinity of an underflow vertical lift gate. In practice, tunnel-type flat-bottomed lift gates experience strong hydrodynamic loading, due to vortex detachment from the gate bottom edge, and nea...

In natural streams, the interaction between water in motion and movable beds derives in transport of material. This is a fact that causes several problems for river regulation, above all in streams which were heavily modified by human interferences. Therefore, to find solutions or at least to alleviate the negative effects that sediment transport c...

The aim of this chapter is to analyze the effect of the groundwater flow in free-surface hydrodynamics. Several series of turbulent flow measurements were carried out in a re-circulating flume where upward seepage was induced by external hydrostatic pressures acting in the lowest part of the channel bed. The results of the experimental measurements...

Computational results are presented for uniform approach flow past emergency gate model, placed in a 2–D channel with free water surface, for two cases: (1) fixed gate and (2) gate moving perpendicular to the water flow. The calculations were made in the dimensionless system, for the assumed Reynolds number Re = 106. The velocity field and vorticit...

A vortex method for simulating a flat flow within moving complex boundaries is presented. Thanks to the use of Lagrange variables (the trajectories of vortex particles) to determine the evolution of vorticity and velocity fields the method offers the possibility of modelling high Reynolds number flows. A procedure for formulating boundary condition...

The two-dimensional problem of the consolidation of an earth dam–subsoil system under body forces is presented. A certain loading scenario of the action (in proper time instants) of the sub-soil's, the dam's and, subsequently, the reservoir water's deadweight and the seepage flow of ground-water arising thereof was assumed. Calculations for the Bio...

In this work, we present the problem of the creeping of the porous medium described by linear and nonlinear poroelasticity models based on physical relation in the Biot's body. The porosity function which depends on a dilatation of skeleton and fluid is introduced into the nonlinear model, and a process of medium deformation is also presented. The...

In this work we present the creep problem of the porous medium described by a linear and nonlinear poroelasticity models based on physical relation of the Biot’s body. The porosity function which depends on a dilatation of skeleton and fluid is introduced into the nonlinear model, and a process of medium deformation is also presented. The filtratio...

The paper discusses the problem of hydrodynamic loads acting on a hydraulic gate around which a liquid flows. A numerical method of determining the pressure distribution on the gate’s surface for known velocity and vorticity fields in the flow area is presented. The meth-od is illustrated with an example of the flow under a vertical lift gate for w...

An application of the discrete vortex method to simulation of flow in a rectangular closed channel with an obstacle has been presented. It is the numerical method used to solving of Navier-Stokes equation with the stream function-vorticity variables, for the flow with a large Reynolds number. The Navier-Stokes equation according to this method desc...

There are presented the results of numerical calculations concerning the flow of viscous fluid. The flow was tested by means of vortex method which was especially suitable for modelling the flow characterized by large Reynolds numbers. The calculations were carried out in the Lagrangian coordinates which allowed the method to be grid-free. The solu...

The results of numerical calculations of the flow over backward-facing step was presented. The vortex blob method was used. The calculations were carried out in Lagrangian coordinates which allowed the method be grid free. The solution was obtained in two steps: firs Euler equation was solved by means of discrete vortex method, and next ,Stokes equ...

Discusses finite element method modelling of tilting gate vibrations. Considers first free vibration of a structure without water, and outlines the solution procedure. For structures in contact with water the added mass is determined from pressure distribution calculations using Laplace's equation. The fluid region is divided into tetrahedral and p...

In this paper the random-vortex method is applied to the two-dimensional flow of an incompressible viscous liquid. A formula for the boundary condition on the free surface and a formula for the no-slip and no-through boundary condi-tions are derived. The flow problem is solved using a fractional step algorithm. In the first step a velocity field is...