Turbulence modeling of compound open-channel flows with and without vegetation on the floodplain using the Reynolds stress model
A Reynolds stress model for the numerical simulation of compound open-channel flows with vegetation on the floodplain is described. The Reynolds stress model consists of various sub-models such as Speziale et al.â€™s model, Mellor and Herringâ€™s model, and Rottaâ€™s model for the pressureâ€“strain correlation term, the turbulent diffusion term, and the dissipation term, respectively. For validation of t ... Read More
High-resolution bathymetric data from an interferometric sonar were used to investigate scours within the distributary channels of the Ã˜yeren delta plain, the largest freshwater delta in northern Europe. The data reveal a range of scours occurring at different settings, including channel confluences, bends, confinements and bedrock scours. The basal erosion surfaces of the scours are up to 23 m b ... Read More
A massive dust storm of glacial sediments swept off the coast of Alaska on November 5, 2005; this image captured the storm as it dispersed over the Gulf of Alaska. Dust appears as a pale beige plume, standing out from both the snowy landscape and ocean water underneath it. The plume comes from the Copper River Valley. Although sandy deserts or parched plains often come to mind as the sources of d ... Read More
We consider existence of three-dimensional gravity waves traveling along a channel of variable depth. It is well known that the long-wave small-amplitude expansion for such waves results in the stationary Kortewegâ€“de Vries equation, coefficients of which depend on the transverse topography of the channel. This equation has a single-humped solitary wave localized in the direction of the wave propa ... Read More
IBM's Zurich Research Laboratory on Thursday (June 5) demonstrated three-dimensional chip stacks that are cooled with water. The company expects to commercialize such stacks for its multicore servers as early as 2013. IBM plans to stack memory chips between processor cores to multiply interconnections by 100 times while reducing their feature size tenfold. To cool the stack at a rate of 180 watts ... Read More
Members of the Department of Chemical and Biomolecular Engineering's Complex Fluids and Nanomaterials Group, lead by Assistant Professor Srinivasa Raghavan, have discovered a new class of "smart fluids" capable of switching from gel to liquid upon exposure to ultraviolet light. A paper detailing the group's findings, titled "A simple class of photorheological fluids: Surfactant solutions with vis ... Read More
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