排序方式: 共有19条查询结果,搜索用时 250 毫秒
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给出抛物方程一种有效的区域分裂差分格式,提高了计算效率.对一阶项采用二阶迎风差分格式,内边界点和各子区域分别采用显隐差分格式.在较弱的稳定性条件下,得到离散l2模误差估计结果.最后给出具体的数值算例,以验证方法的实用性. 相似文献
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We propose a modified upwind finite difference fractional step scheme for the computational fluid mechanics simulations of a three-dimensional photoelectric semiconductor detector. We obtain the optimal l^2-norm error estimates by using the techniques including the calculus of variations, the energy methods, the induction hypothesis, and a priori estimates. The proposed scheme is successfully applied to the simulation of the photoelectric semiconductor detectors. 相似文献
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For the section coupled system of multilayer dynamics of fluids in porous media, a parallel scheme modified by the characteristic finite difference fractional steps is proposed for a complete point set consisting of coarse and fine partitions. Some tech- niques, such as calculus of variations, energy method, twofold-quadratic interpolation of product type, multiplicative commutation law of difference operators, decomposition of high order difference operators, and prior estimates, are used in theoretical analysis. Optimal order estimates in 12 norm are derived to show accuracy of the second order approximation solutions. These methods have been used to simulate the problems of migration-accumulation of oil resources. 相似文献
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三维两相渗流驱动问题迎风区域分裂显隐差分法 总被引:1,自引:0,他引:1
对三维两相渗流驱动问题提出了两种迎风区域分裂显隐差分格式.压力方程采用了七点差分格式,为了能达到实际并行计算的要求,对饱和度方程采用了迎风区域分裂差分法,内边界处和各子区域分别对应显隐格式.得到了离散l2模收敛性分析,最后给出数值试验,支撑了理论分析结果. 相似文献
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传统点胶设备的点胶轨迹是通过人工示教和阵列输入的方式生成的,这种方式不仅操作复杂,且没有考虑到各工件存在高度差异,导致点胶的精度不高,生产效率和点胶合格率较低。针对这一问题,提出一种融合相机和激光传感器信息来自动定位点胶位置的点胶系统。先制定模板图像和示教点胶轨迹,然后用基于NCC的模板匹配方法得到目标工件的位姿,再通过激光传感器测得目标工件的点胶平面高度值,最后通过坐标变换得到点胶轨迹在三轴点胶平台坐标系下的坐标。实验结果表明:该系统在定位速度和精度上都满足对点胶生产的需求,且对于存在高低差异的工件可以保持一致的点胶效果。 相似文献
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The coupled system of multilayer dynamics of fluids in porous media is to describe the history of oil-gas transport and accumulation in basin evolution.It is of great value in rational evaluation of prospecting and exploiting oil-gas resources.The mathematical model can be described as a coupled system of nonlinear partial differential equations with moving boundary values.A kind of characteristic finite difference schemes is put forward,from which optimal order estimates in l^2 norm are derived for the error in the approximate solutions.The research is important both theoretically and practically for the model analysis in the field,the model numerical method and software development. 相似文献
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