| ATTRIBUTE | VALUE |
|---|---|
| type | C |
| database id | 6548 |
| title | |
| authors | Kazimierz Szmidt1 |
| affiliations | |
| year | 2007 |
| series | Archives of Hydro-Engineering and Environmental Mechanics |
| issue | Vol. 54, No. 2 |
| publisher | Wydawnictwo IBW PAN |
| place | Gdańsk |
| attributes | [published] [reviewed] [scientific] [international reach] |
| language | en |
| ATTRIBUTE | VALUE |
|---|---|
| type | A |
| database id | 6261 |
| title | Numerical simulation of one-dimensional two-phase flow in porous media |
| authors | Szymkiewicz A. |
| pages | 117 — 136 |
| full text link | http://www.ibwpan.gda.pl/storage/app/media/ahem/ahem54str117.pdf |
| keywords | two-phase flow, porous media, numerical methods |
| affiliations | |
| abstracts | The flow of two immiscible fluids in porous media is described by two coupled non-linear partial differential equations of the parabolic type. In this paper a numerical algorithm to simulate one-dimensional two-phase flow is presented. Cell-centered finite volume method and a generalized two-level scheme with weighting parameter are applied for the discretization in space and time, respectively. The performance of the algorithm is tested for different values of the weighting parameter in the time-discretization scheme and for various methods of approximation of the average conductivities between two adjacent gridblocks. The results are compared with an analytical solution for the horizontal flow and with a reference numerical solution performed on a dense grid for the vertical flow. |
| attributes | [reviewed] [scientific] |
| language | en |
| points | 4 |
| ATTRIBUTE | VALUE |
|---|---|
| type | A |
| database id | 6550 |
| title | On the transformation of long gravitational waves in a region of variable water depth: a comparison of theory and experiment |
| authors | Szmidt K., Hedzielski B. |
| pages | 137 — 158 |
| full text link | http://www.ibwpan.gda.pl/storage/app/media/ahem/ahem54str137.pdf |
| keywords | shallow water, non-linear wave, non-uniform water depth, unsteady motion, wave reflection |
| affiliations | |
| tasks | Z 1.3.1/2007: Zbadanie odbicia fal o skończonej amplitudzie od pionowej ściany w strefie brzegowej morza |
| abstracts | The paper describes investigations on transformation of long gravitational waves in water of variable depth with reflection of the waves from a shelf barrier. In the model considered, a long water wave arrives from an area of constant water depth to an area of constant, smaller water depth, where it reflects at a vertical wall. The analysis is confined to a finite fluid domain, relevant to experimental investigations in a laboratory flume. In theoretical analysis of the phenomenon, we follow a non-linear shallow water approximation to the problem considered. The fundamental equations of fluid motion are derived with the help of a standard variational procedure in a material system of coordinates. The equations proved to be a reasonable approximation to a description of the long waves propagating in fluid with small variation of its depth. In the discussed case of reflection of such waves from a vertical barrier, however, the motion of the fluid is more complicated and therefore the long water wave theory does not deliver as good results as in the case of pure propagation of the waves. The primary objective of this paper is thus to compare the theoretical solution proposed with data obtained in experiments, and to answer the question about accuracy and applicability of the theoretical model in the description of the problem investigated. |
| attributes | [reviewed] [scientific] |
| language | en |
| points | 4 |
| ATTRIBUTE | VALUE |
|---|---|
| type | A |
| database id | 6236 |
| title | Loads on an off-shore structure due to an ice floe impact |
| authors | Staroszczyk R. |
| pages | 77 — 94 |
| full text link | http://www.ibwpan.gda.pl/storage/app/media/ahem/ahem54str077.pdf |
| keywords | floating ice, off-shore structure, dynamic impact, brittle fracture |
| affiliations | |
| abstracts | In the paper, the problem of dynamic impact of a floating ice sheet at an off-shore structure is considered. It is assumed that during an interaction event the dominant mechanism is the brittle fracture of ice at the ice--structure interface, that is, elastic and creep effects in ice are ignored. Since in natural conditions the edge of floating ice is usually irregular, the contact between a floe and an engineering object is imperfect. Thus, at any one time, the failure of ice occurs only in a number of small zones along a structure wall, leading to a highly irregular variation of forces exerted on the structure during the impact process. It is supposed in the analysis that the successive small-scale fracture events at the contact surface occur at random, and all these small-scale events take place independently of each other. An off-shore structure is modelled as a fixed and rigid circular cylinder with vertical walls. For an adopted geometry of the ice sheet, its initial horizontal velocity, and the variety of parameters describing the limit failure stresses in ice, the history of total loads sustained by the structure and the floe velocity variation are illustrated for a typical impact event. Furthermore, probability distributions for maximum impact forces exerted on the structure, depending on the floe size, its thickness and initial velocity, are determined. |
| attributes | [reviewed] [scientific] |
| language | en |
| points | 4 |
| ATTRIBUTE | VALUE |
|---|---|
| type | A |
| database id | 6549 |
| title | Hydraulic loss coefficients in 1D flows |
| authors | Sawicki J. |
| pages | 95 — 116 |
| full text link | http://www.ibwpan.gda.pl/storage/app/media/ahem/ahem54str095.pdf |
| keywords | hydraulic loss, closed-conduits flows, water hammer, open-channels flow |
| affiliations | |
| abstracts | Determination of hydraulic losses is a very important problem, both from the cognitive and practical points of view. For the uniform and steady fluid streams these losses are described by the well known algebraic expressions, containing some experimental coefficients. In technical practice it is commonly assumed, that these coefficients can be applied also for more complex kinds of flow (non-uniform and even unsteady). However, the problem analysis shows that the proper level of conformity between the results of calculations and measurements can be obtained only after a considerable enlargement of the loss coefficient. Investigation of available characteristics of non-uniform and unsteady 1D velocity fields, presented in this article, leads to the conclusion that this enlargement is physically justified and in some cases it is possible to determine correction factors, which enable recalculation of “basic” coefficients into their new values, suitable for more complex models of 1D flows. |
| attributes | [reviewed] [scientific] |
| language | en |