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It’s required to decompress with the draining pipe network when there is a relatively high groundwater level outside of the lining channels. The self-draining pipe network is composed of longitudinal collecting underground pipes, transverse communicating pipes and non retern drain valves. The pipe flow might be laminar flow or turbulent flow… (More)
Classical N-S equation is of first order accuracy in both time and space.First order scheme only includes first order terms,without the terms of second or higher order. These terms are relative to time and space intervals.As basic elements of fluid research,time and space intervals should be some finite quantities and not be infinitely near to zero as… (More)
The phenomena of refracted flow exist in sudden expansion flow. Under condition of symmetric boundary, flow refracts randomly. Computing sudden expansion flow, the random function can be used to generate a random number. It can determine direction of iterating. The numerical simulation can correspond with results of experiment in this way.