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Centered simple waves for the two-dimensional pseudo-steady isothermal ?ow around a convex corner

Applied Mathematics and Mechanics(English Edition) 2019年第5期40卷 705-718页

作者： Wancheng SHENG Aidi YAO Department of Mathematics Shanghai University School of Mathematics and Big Data Anhui University of Science and Technology

The two-dimensional(2D) pseudo-steady isothermal flow, which is isentropic and irrotational, around a convex corner is studied. The self-similar solutions for the supersonic flow around the convex corner are constructed, where the properties of the centered simple wave are used for the 2D isentropic irrotational pseudo-steady Euler equations. The geometric procedures of the center simple waves are given. It is proven that the supersonic flow turns the convex corner by an incomplete centered expansion wave or an incomplete centered compression wave, depending on the conditions of the downstream state.

关键词： pseudo-steady flow isothermal flow two-dimensional (2D) Euler equation centered expansion simple wave centered compression simple wave

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Mean wind load induced incompatibility in nonlinear aeroelastic simulations of bridge spans

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Frontiers of Structural and Civil Engineering 2019年第3期13卷 605-617页

作者： Zhitian ZHANG Wind Engineering Research Center Hunan UniversityChangsha 410082China

Mean wind response induced incompatibility and nonlinearity in bridge aerodynamics is discussed,where the mean wind and aeroelastic loads are applied simultaneously in time domain.A kind of incompatibility is found during the simultaneous simulation of the mean wind and aeroelastic loads,which leads to incorrect mean wind structural *** is found that the mathematic expectations (or Iimiting characteristics) of the aeroelastic models are fundamental to this kind of *** this paper,two aeroelastic models are presented and discussed,one of indicial-function-denoted (IF-denoted) and another of rational-function-denoted (RF-denoted).It is shown that,in cases of low wind speeds,the IF-denoted model reflects correctly the mean wind load properties,and results in correct mean structural responses;in contrast,the RF-denoted model leads to incorrect mean responses due to its nonphysical mean *** very high wind speeds,however,even the IF-denoted model can lead to significant deviation from the correct response due to steady aerodynamic *** solve the incompatibility at high wind speeds,a methodology of subtraction of pseudo-steady effects from the aeroelastic model is put forward in this ***,with the method presented,aeroelastic nonlinearity resulted from the mean wind response is investigated at both moderate and high wind speeds.

关键词： bridge aerodynamics nonlinear aeroelastic model pseudo-steady mean wind loads

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Study and Application of Horizontal Well Productivity Formula with Continuous Time-Varying Considered

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Journal of Power and Energy Engineering 2018年第9期6卷 32-39页

作者： Chao Liu Junting Zhang Haojun Wu Bo Zhang Long Wang Bohai Oilfield Research Institute of CNOOC Ltd. Tianjin Branch Tianjin China

The horizontal well technology has been widely applied to enhanced oil recovery for low permeability and heavy oil reservoir. It is the important basis for designing and optimizing horizontal well to determine the productivity. The productivity determination of horizontal wells in offshore oil fields is mainly based on the actual productivity data of producing directional wells in the similar reservoirs nearby. Considering pressure drop and oil layer thickness to calculate the productivity, this method lacks certain theoretical basis and requires rich working experience for reservoir engineers. The other method is Joshi Formula which needs the known horizontal well control radius to be known. But the control radius is man-made at certain degree. In order to address the shortcomings of existing methods, a new reservoir engineering method was proposed to determine the horizontal well productivity formula, horizontal flow pattern and control radius based on the principle of equivalent flow resistance and conformal transformation. This method has overcome the disadvantage of determining on person. It provided some theoretical basis for getting the horizontal well productivity and is of some guiding meaning for evaluating the productivity of adjustment wells and development wells.

关键词： Horizontal Well Principle of Equivalent Flow Resistance Conformal Transformation Control Radius pseudo-steady State Time

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