With rising water levels dams may fail. This conceptual study shows that the change of the water level impacts on the stability of the dam. While for the lower water level the dam remains stable, instabilities show when it is higher.
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With rising water levels dams may fail. This conceptual study shows that the change of the water level impacts on the stability of the dam. While for the lower water level the dam remains stable, instabilities show when it is higher.
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The interactions between the fluid and the particles are simulated with an unresolved CFD-DEM solver while the interaction of the fluid with the dredge-geometry captured by an immersed boundary approach. The “body” region (i.e., those mesh cells, where the dredge is present) as well as the velocity glyphs depicting the fluid velocity are shown in the video.
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This video shows a simulation using an immersed boundary (IB) method to resolve the flow around a large sphere. This represent a prototype case for studying more complex phenomena such as sediment motion in environmental flows.
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In this simulation of a gravel pack we are modelling pressure loss through an attached tube depending on the flow at the outlet. The input is the pressure at the tube outlet and a loss coefficient. At the bottom outlet there is a substancially larger pressure loss and thus less flow. Furthermore, the tube outlet pressure at the bottom oscillates in time.
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Using a combination of volume of fluid (VOF) and DEM to model river bed erosion. In the course of the project we could directly compare experimental results (see image) against simulation results. The turbulent lift force had an essential influence, the model by Zanke (2005) showed the best performance.
Publications:
Gruber, K., Kloss, C., Goniva, C. (2012) Numerical and experimental study of erosion in open channel flow, Proc. IHAR
Zanke, U. (2003). On the influence of turbulence on the initiation of sediment motion. International Journal of Sediment Research, pp. 17-31
Chepil, W. (1961). The use of evenly spheres to measure lift and drag on wind-eroded soil grains. Soil Sci. Soc. Am, pp. 343-345
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The basic concept of hybrid resolved-unresolved IB is the following: within a simulation, some particles are treated as resolved while others are considered unresolved. The selection of the handling is done by a geometric region (i.e., if a particle is in the region, do IB). Automatic refinement is used to achieve the resolved resolution for the refined particles.
Animation of channel clogging with IB Clogging model
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Interaction of a ship with the soil underneath using a CFD-DEM method together with an immersed boundary/fictitious domain method.
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Analysis of the energy used to lift a bowl out of a packed bed.
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