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目前针对有水气藏地质储量的计算方法有很多种,如压降法、非线性物质平衡法、二元回归法、三元回归法等。其中,压降法是物质平衡法的特例。由于其是应用气藏的动态资料计算气藏的地质储量,故其计算结果是动态储量。但是由于有水气藏的储量计算中不能忽略水侵的影响,因此如果仍按普通气藏的处理方式来对待,必将引起较大的误差。本文对蜀南气矿的13个裂缝系统用压降法进行了储量计算,计算并总结了压降法在有水储量计算中的精度及其适用性。 相似文献
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程达芳 《高校化学工程学报》1989,(2)
多效蒸发器的设计通常采用试差法计算,而不考虑最优化问题。本文对标准式蒸发器进行了各效等面积和最优法多效蒸发过程模拟对比计算,以糖液蒸发为例,开发了一个以最优法计算多效过程的程序。计算结果表明,最优化设计有着明显的经济效益和实用价值。 相似文献
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本文针对稠油蒸汽吞吐阶段采收率计算的基本原理和适用条件,对稠油油藏蒸汽吞吐开发条件下确定采收率的类比法、多元回归法、注采特征曲线法、增长曲线法、递减曲线法、粘温曲线法、数值模拟法等方法进行了归类对比分析,形成了稠油油藏蒸汽吞吐阶段原油采收率确定方法系列,指出目前较为常用的原油采收率计算方法,得到了计算效果较好的原油采收率计算方法。 相似文献
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无网格法对网格依赖性较弱,避免了时域有限差分法等基于网格的数值方法中可能出现的网格畸变和边界条件难以处理等问题。无网格RPIM法,通过引入FDTD数值计算方法及原理,提高了算法的适应性和计算精度和速率。另外,还对无网格RPIM法在电磁建模进行了深入研究,并对无网格RPIM法和FDTD方法的内存损耗、计算速率等参数进行了比较。最后,对无网格RPIM法的未来发展做了展望。 相似文献
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STUDY AND IMPROVEMENT OF RIHANI-DORAISWAMY ESTIMATION METHOD FOR Cp° WITH COMPUTER PROGRAM
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Based on the group contribution method of Rihani and Doraiswamy, a program system has been set up for automatically analyzing structures and computing ideal gas heat capacities. The method was verifled by using evaluated literature data of 479 organic compounds. The assessment of its computing precision and applicability has been made and some new group parameters recommended. 相似文献
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稳健优化设计需要进行不确定性分析,优化过程比较费时。为提高计算效率,提出了基于Kriging代理模型的稳健优化设计方法。该方法结合双重Kriging代理模型和多点加点准则进行稳健优化设计。双重Kriging代理模型的建立,减小了不确定性分析的计算量,提高了计算效率。多点加点准则实现了序列的迭代优化,在保证计算效率的同时提高了对全局最优解的逼近程度。数学函数测试结果表明,与一般模拟基稳健优化方法相比,本文所提出的序列稳健优化方法在效率上有很大的提高。最后,考虑注塑工艺的不稳定性,对一盒式注塑制件的壁厚和工艺进行稳健优化,结果表明该稳健优化设计方法是有效的。 相似文献
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在进行旋转液滴法测界面张力的实验过程中,在液滴体积小或者界面张力值大的情况下,提高转速不能达到仪器测试的条件要求。对旋转液滴法测界面张力的模型进行分析,首先给出了旋转液滴椭圆形态计算界面张力的求解模型,对参数的敏感性进行了分析的同时刻画了椭圆边界的形态特征;其次根据建立的模型求解过程形成的数据库,建立了求解旋转液滴椭圆形态计算界面张力值的图版方法和迭代算法;再次列举出了一个新的求解方法,最后对以上各种计算方法进行了实例应用。研究认为各种方法下,推荐对液滴长度和直径都进行测量。 相似文献
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Speed-up of computing time for numerical analysis of particle charging process by using discrete element method 总被引:1,自引:0,他引:1
Hiroshi Mio Masatoshi Akashi Yoshiyuki Shirakawa Shinroku Matsuzaki 《Chemical engineering science》2009,64(5):1019-1026
The objective of this paper is to improve the computing time for numerical analysis of particle charging process by using discrete element method. The rule for ignoring the calculations of contact forces and updating trajectories of unmoved particles were discussed. When the relative displacement of a particle within certain calculation steps became less than 0.1% of particle radius, this particle was determined to be unmoved and the calculations of this particle were ignored. The computing time was improved significantly when this new method was used, and its calculation speed was more than two times faster than that of original. It was found that this speed-up method is more useful for the cases that the particle becomes unmoved in short time or the height of charged bed is large. The simulation of charging process in an industrial-scale surge hopper was studied by using new method, the calculation speed became 2.88 times faster than that of original, and the quite similar particle size segregation between original and new methods was given. This new method for speed-up of the charging process in DEM is very useful, and the charging processes of the industrial scale storages can be simulated by using this method. 相似文献
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注塑冷却管网的简化计算 总被引:1,自引:0,他引:1
给出了作者推导的冷却管道椭圆积分项计算公式,分析了它的复杂性,采用降维处理方法,将原来的二维管道单元简化为一维线单元,简化了计算,提高了计算速度,缩短了计算时间。 相似文献
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Saeid Atashrouz Hamed Mirshekar Abdolhossein Hemmati-Sarapardeh Mostafa Keshavarz Moraveji Bahram Nasernejad 《Korean Journal of Chemical Engineering》2017,34(2):425-439
The main objective of this study was to develop soft computing approaches for prediction of physicochemical properties of IL mixtures including: density, heat capacity, thermal conductivity, and surface tension. The proposed models in this study are based on support vector machine (SVM), least square support vector machines (LSSVM), and group method of data handling type polynomial neural network (GMDH-PNN) systems. To find the LSSVM and SVM adjustable parameters, genetic algorithm (GA) as a meta-heuristic algorithm was utilized. The results showed that LSSVM is more robust and reliable for prediction of physicochemical properties of IL mixtures. The proposed GA-LSSVM model provides average absolute relative deviations of 0.38%, 0.18%, 0.77% and 1.18% for density, heat capacity, thermal conductivity, and surface tension, respectively, which demonstrates high accuracy of the model for prediction of physicochemical properties of IL mixtures. 相似文献