7,297 research outputs found

    The late-time development of the Richtmyer–Meshkov instability

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    Measurements have been made of the growth by the Richtmyer–Meshkov instability of nominally single-scale perturbations on an air/sulfur hexafluoride (SF6) interface in a large shock tube. An approximately sinusoidal shape is given to the interface by a wire mesh which supports a polymeric membrane separating the air from the SF6. A single shock wave incident on the interface induces motion by the baroclinic mechanism of vorticity generation. The visual thickness delta of the interface is measured from schlieren photographs obtained singly in each run and in high-speed motion pictures. Data are presented for delta at times considerably larger than previously reported, and they are tested for self-similarity including independence of initial conditions. Four different initial amplitude/wavelength combinations at one incident shock strength are used to determine the scaling of the data. It is found that the growth rate decreases rapidly with time, ddelta/dt[proportional]t–p (i.e., delta[proportional]t1–p), where 0.67<~p<~0.74 and that a small dependence on the initial wavelength lambda0 persists to large time. The larger value of the power law exponent agrees with the result of the late-time-decay similarity law of Huang and Leonard [Phys. Fluids 6, 3765–3775 (1994)]. The influence of the wire mesh and membrane on the mixing process is assessed

    Victory contractor resource center : final project report

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    Goler Community Development Corporation and its partners are developing a Contractor Resource Center called the Victory Contractor Resource Center (VCRC) for low-resource contractors focused on the skilled construction trade, which includes general contractors. The purpose of the center is to increase low-resource contractor participation in large-scale projects. Additionally, the role of the resource center will be to aid low-resource contractors in partnering with each other and collaborating contractually with majority contractors to ensure their ability to get to the negotiation table and their ability to reach the scale of production necessary to adequately perform the job. Ordinarily these contracts would be beyond the low-resource contractor's individual capacity. The resource center will bring intellectual capital to the underserved market of low-resource owned construction businesses across a two county area. The resource center along with its advisory board will create numerous opportunities for low-resource and majority businesses to network and build relationships. The goal is to create 36 new jobs in the skilled construction trade by increasing 9 low-resource contractor's revenue by 20% after two years. (Author abstract)Rasheed, A. A. (2007). Victory contractor resource center: final project report. Retrieved from http://academicarchive.snhu.eduMaster of Science (M.S.)School of Community Economic Developmen
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